Edwards_nEXT_Turbo_Pumps_Product_Manual

Edwards_nEXT_Turbo_Pumps_Product_Manual
B800-00-880
Issue D Original
Instruction Manual
nEXT Turbomolecular Pumps
nEXT240, nEXT300 and nEXT400
Description
Item Number
nEXT240D
B812XXXXX
nEXT240T
B813XXXXX
nEXT300D
B822XXXXX
nEXT300T
B823XXXXX
nEXT400D
B832XXXXX
nEXT400T
B833XXXXX
Declaration of Conformity
We,
Edwards Limited,
Crawley Business Quarter,
Manor Royal,
Crawley,
West Sussex, RH10 9LW, UK
declare under our sole responsibility, as manufacturer and person within the EU authorised to assemble
the technical file, that the product(s)*
B812 XXXXX
B813 XXXXX
B822 XXXXX
B823 XXXXX
B832 XXXXX
B833 XXXXX
nEXT 240D
nEXT 240T
nEXT 300D
nEXT 300T
nEXT 400D
nEXT 400T
to which this declaration relates is in conformity with the following standard(s) or other normative
document(s)
EN ISO 12100-2: 2003 Safety of Machinery. Basic Concepts, General Principles for
+ A1: 2009
Design. Technical Principals
EN1012-2:1996, A1: 2009
Compressors and Vacuum Pumps. Safety Requirements.
Vacuum Pumps
EN61010-1: 2010
Safety Requirements for Electrical Equipment for Measurement,
Control and Laboratory Use. General Requirements
EN 61326-1: 2006
Electrical equipment for measurement, control and laboratory
Use. EMC requirements. General requirements.
EN50581:2012
Technical Documentation for the Assessment of Electrical and Electronic
Products with respect to the Restriction of Hazardous Substances
C22.2 61010-1-04: 2004
Safety requirements for electrical equipment for measurement,
Control and laboratory use – Part 1: General requirements
UL61010A: 2002
Safety requirements for electrical equipment for measurement,
Control and laboratory use – Part 1: General requirements
and fulfils all the relevant provisions of
2006/42/EC
2006/95/EC
2004/108/EC
2011/65/EU†
*
†
Machinery Directive
Low Voltage Directive
Electromagnetic Compatibility (EMC) Directive
Restriction of Certain Hazardous Substances (RoHS) Directive
The material numbers cover a family of pumps where the following component features may vary according to the
variant; ‘X’ denotes combinations of variants of the geometry of pump inlet ports, geometry or position of exhaust
port and the material and geometry of the pump casing.
i.e. The product(s) contain less than - 0.1wt% for hexavalent chromium, lead, mercury, PBB and PBDE; 0.01wt% for
cadmium - in homogeneous materials (subject to the exemptions allowed by the Directive). The RoHS Directive
does not legally apply to industrial vacuum equipment until July 2019 (July 2017 for instruments).
21.11.2013, Burgess Hill
Mr Peter Meares, GV Technical Support Manager
Date and Place
This product has been manufactured under a quality system certified to ISO9001:2008
P200-03-600 Issue E
Note: This declaration covers all product serial numbers from the date this Declaration was signed
onwards.
B800-00-880 Issue D
mv/11/2013
Section
Page
1
Introduction ....................................................................................... 1
1.1
1.2
1.3
1.4
1.4.1
1.4.2
1.4.3
1.4.4
1.4.5
1.4.6
1.5
1.5.1
1.5.2
1.5.3
1.5.4
1.5.5
Scope and definitions ................................................................................................... 1
General description ..................................................................................................... 2
Pump controller .......................................................................................................... 3
Operational features .................................................................................................... 3
Power limit setting ...................................................................................................... 3
Standby speed ............................................................................................................ 4
Timer ...................................................................................................................... 4
Analogue output ......................................................................................................... 4
Automatic vent options ................................................................................................. 4
Normal speed setting .................................................................................................... 5
Logic interface ........................................................................................................... 5
Parallel control and monitoring ....................................................................................... 5
Serial control and monitoring .......................................................................................... 6
Serial control with parallel monitoring ............................................................................... 6
Parallel control with serial monitoring or serial configuration ................................................... 6
Controller configuration (serial configuration) ...................................................................... 6
2
Technical data .................................................................................... 9
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2.11
General .................................................................................................................... 9
Pumping media ........................................................................................................... 9
Vent gas specification and vent control data ...................................................................... 22
Purge gas specification ................................................................................................23
Cooling water ............................................................................................................ 23
Materials exposed to gases pumped ................................................................................. 23
Electrical data ...........................................................................................................24
Logic interface connector .............................................................................................24
Controller connector socket .......................................................................................... 27
Indicator LED’s ..........................................................................................................28
Operating and storage environment ................................................................................. 28
3
Installation ....................................................................................... 29
3.1
3.2
3.3
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.4
3.4.1
3.4.2
3.5
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
3.6
3.7
Unpack and inspect .....................................................................................................29
Typical installation .....................................................................................................29
Connection to the vacuum system ................................................................................... 30
Inlet screen (supplied fitted on CF only) ............................................................................ 31
Mechanical fixing .......................................................................................................31
Inlet connection and orientation ..................................................................................... 31
Base mounting ...........................................................................................................32
Backing connection .....................................................................................................32
Interstage connection (variants only) ............................................................................... 33
Purge gas connection ...................................................................................................33
Connect the purge gas .................................................................................................33
Recommended purge gas flow ........................................................................................ 33
Electrical installation ..................................................................................................33
Introduction ............................................................................................................. 33
Earth (ground) connections ...........................................................................................34
Connect the logic interface to the TIC .............................................................................. 34
Connect the logic interface to the customer control equipment ............................................... 34
Connect the electrical supply ......................................................................................... 34
Connection for parallel control and monitoring ................................................................... 36
Connection for serial control and monitoring ...................................................................... 36
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page i
Contents
Contents
B800-00-880 Issue D
Contents
3.7.1
3.7.2
3.7.3
3.7.4
3.7.5
3.7.6
3.8
3.9
3.9.1
3.9.2
3.9.3
3.9.4
3.10
3.10.1
3.10.2
3.10.3
Connect the serial interface to the customer control equipment .............................................. 36
Serial Enable ............................................................................................................. 39
Serial protocol ...........................................................................................................39
Message structure .......................................................................................................41
Command set ............................................................................................................ 42
multi-drop operation ...................................................................................................46
Connection for mixed parallel and serial operation ...............................................................46
Vent valve selection, connection and control ...................................................................... 46
Manual vent valve ......................................................................................................47
TAV5 or TAV6 solenoid vent valve .................................................................................... 47
Vent valve control ......................................................................................................47
Alternative valve connected to the vacuum system ..............................................................48
Cooling ................................................................................................................... 49
Introduction ............................................................................................................. 49
Forced air cooling .......................................................................................................49
Water cooling ............................................................................................................ 49
4
Operation ........................................................................................ 51
4.1
4.1.1
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.1.7
4.1.8
4.1.9
4.2
4.3
4.3.1
4.3.2
4.4
4.4.1
4.4.2
4.4.3
4.4.4
4.5
4.5.1
4.5.2
4.5.3
4.5.4
4.5.5
4.5.6
4.5.7
4.6
4.7
4.8
4.9
4.9.1
4.9.2
4.9.3
4.9.4
4.10
Configuring the nEXT pump using serial commands ...............................................................51
Power limit setting .....................................................................................................51
Powering a fan from the Controller .................................................................................. 52
Controlled venting options ............................................................................................52
Standby speed setting ..................................................................................................53
Normal speed setting ...................................................................................................53
Timer setting and options .............................................................................................54
Analogue signal options ................................................................................................55
Factory settings ......................................................................................................... 55
Assigning a multi-drop address ....................................................................................... 55
Configuring the nEXT pump using a TIC ............................................................................. 56
Before starting the pump ..............................................................................................57
Close the vent valve ....................................................................................................57
Pre-start checks ......................................................................................................... 57
Operation with parallel control and monitoring ................................................................... 58
Start the pump ..........................................................................................................58
Running at standby speed .............................................................................................58
Stop the pump ...........................................................................................................58
Parallel monitoring .....................................................................................................58
Operation with serial control and monitoring ...................................................................... 58
Delayed start ............................................................................................................ 58
Start the pump ..........................................................................................................59
Standby speed ...........................................................................................................59
Stop the pump ...........................................................................................................59
Temperature readings .................................................................................................59
Link parameter readings ...............................................................................................60
Measured motor speed .................................................................................................60
Mixed parallel and serial operation .................................................................................. 60
Operation with a TIC ...................................................................................................62
Decelerating and venting ..............................................................................................62
Operation at extreme conditions ..................................................................................... 63
Operation with high inlet pressure ................................................................................... 63
Operation at high temperatures ...................................................................................... 63
Protection against over-speed ........................................................................................ 63
Electrical supply failure ...............................................................................................63
Bakeout ................................................................................................................... 64
5
Maintenance ..................................................................................... 67
5.1
5.2
5.3
Introduction ............................................................................................................. 67
Bearing and oil cartidge maintenance ............................................................................... 67
Rotor life ................................................................................................................. 67
Page ii
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Clean the external surfaces of the pump ........................................................................... 67
Fault finding ............................................................................................................. 68
Flashing service codes .................................................................................................71
Decoding service status words ........................................................................................ 71
Controller run time .....................................................................................................72
Pump run time ..........................................................................................................72
Pump cycles ............................................................................................................. 72
Bearing run time ........................................................................................................73
Oil cartridge run time ..................................................................................................73
Flashing error codes ....................................................................................................73
Decoding system status words ........................................................................................ 74
Useful service information ............................................................................................76
6
Storage and disposal ........................................................................... 77
6.1
6.2
Storage ................................................................................................................... 77
Disposal ................................................................................................................... 77
7
Service, spares and accessories .............................................................. 79
7.1
7.2
7.2.1
7.2.2
7.3
7.3.1
7.3.2
7.3.3
7.3.4
7.4
7.4.1
7.4.2
7.4.3
7.4.4
7.4.5
7.4.6
7.4.7
7.4.8
7.4.9
7.4.10
7.4.11
Introduction ............................................................................................................. 79
Service .................................................................................................................... 79
Returning a pump for service ......................................................................................... 79
Bearing and oil cartridge on-site maintenance .................................................................... 79
Spares ..................................................................................................................... 80
ISX inlet screen ..........................................................................................................80
Inlet strainer ............................................................................................................. 80
Inlet-flange seals and integrated inlet screens .................................................................... 80
NW16 and NW25 Ports .................................................................................................81
Accessories ............................................................................................................... 81
Installation ............................................................................................................... 81
ACX air cooler ........................................................................................................... 81
WCX water cooler .......................................................................................................81
BX bakeout band ........................................................................................................82
TAV vent valve and vent port adaptor ............................................................................... 82
VRX vent restrictor .....................................................................................................82
Vent port adaptor .......................................................................................................83
PRX purge restrictor ....................................................................................................83
C-Clamp Adaptor Kit ...................................................................................................83
Interface Cable ..........................................................................................................83
TIC PC Program .......................................................................................................... 83
Index .............................................................................................. 87
For return of equipment, complete the HS Forms at the end of this manual.
Illustrations
Figure
1
2
3
4
5
6
7
8
Page
nEXT240 performance curve .......................................................................................... 14
nEXT300 performance curve .......................................................................................... 14
nEXT400 performance curve .......................................................................................... 15
nEXT 240 dimensions (mm) ............................................................................................16
nEXT 300 dimensions (mm) ............................................................................................18
nEXT 400 dimensions (mm) ............................................................................................20
Max allowed rate of pressure rise during venting: pressure against time (pump initially at full speed) .. 22
Interface circuits for nEXT turbo pump controllers ...............................................................26
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page iii
Contents
5.4
5.5
5.5.1
5.5.2
5.5.3
5.5.4
5.5.5
5.5.6
5.5.7
5.5.8
5.5.9
5.5.10
B800-00-880 Issue D
Contents
9
10
11
12
13
14
15
16
17
18
19
20
21
Controller connector showing pin numbers ......................................................................... 27
Typical pumping system with a nEXT pump ........................................................................ 30
Logic interface connections - parallel control ..................................................................... 35
Controller status information ......................................................................................... 37
Logic interface connections - RS232 serial control ................................................................38
Logic interface connections - RS485 serial control ................................................................38
Conceptual diagram for multi-drop connection using RS232 interface ......................................... 40
RS485 multi-drop connection ......................................................................................... 41
Logic interface connection - mixed parallel and serial operation .............................................. 45
Maximum relative humidity to avoid condensation with water cooling ........................................ 50
Serial and parallel control flowchart ................................................................................ 62
nEXT exploded accessories view ..................................................................................... 84
nEXT exploded accessories view ..................................................................................... 85
Tables
Table
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
Page iv
Page
Power limits .............................................................................................................. 3
General data .............................................................................................................. 9
nEXT 240 pumps technical data ...................................................................................... 10
nEXT 300 pumps technical data ...................................................................................... 11
nEXT 400 pumps technical data ...................................................................................... 12
nEXT pumps technical data ...........................................................................................13
Vent gas specification and vent control ............................................................................. 22
Purge gas specification ................................................................................................23
Cooling water specification ...........................................................................................23
Logic interface technical data ........................................................................................ 24
Logic interface connector pins ....................................................................................... 25
Controller technical data ..............................................................................................27
Indicator LED’s ..........................................................................................................28
Operating and storage environment ................................................................................. 28
Checklist of components ...............................................................................................29
Summary of commands that can be sent to the nEXT pump .....................................................42
Command abbreviations ...............................................................................................43
Error codes ............................................................................................................... 44
Vent options ............................................................................................................. 48
Vent restrictor orifice diameter (with atmospheric pressure at the inlet of the vent valve) ..............48
Power limit setting .....................................................................................................51
Analogue signal options ................................................................................................55
Serial enable matrix ....................................................................................................61
Behaviour of a pump when the power is re-instated after an electrical supply failure .....................64
Fault finding ............................................................................................................. 68
Flashing service codes .................................................................................................71
Service flags ............................................................................................................. 71
Flashing error codes ....................................................................................................73
Hexadecimal conversion table ........................................................................................ 74
Status flag ................................................................................................................ 75
Example decoding of system status words .......................................................................... 76
Service tool kits .........................................................................................................79
Service kits .............................................................................................................. 80
Inlet screens ............................................................................................................. 80
Inlet strainers ...........................................................................................................80
Inlet flange seals and integrated inlet screens .................................................................... 80
NW16 and NW25 ports ..................................................................................................81
ACX air cooler ...........................................................................................................81
WCX water cooler .......................................................................................................81
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
BX bakeout band ........................................................................................................82
TAV vent valve and vent port adaptor ............................................................................... 82
Vent restrictors .........................................................................................................82
Vent port adaptor .......................................................................................................83
PRX purge restrictor ....................................................................................................83
C-clamp adaptor tool kit ..............................................................................................83
C-clamp adaptor port kit ..............................................................................................83
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page v
Contents
40
41
42
43
44
45
46
B800-00-880 Issue D
This page has been intentionally left blank.
Page vi
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Introduction
1.1
Scope and definitions
This manual provides installation, operation and maintenance instructions for Edwards nEXT Turbomolecular Pumps.
The pumps must be used as specified in this manual. Read this manual before installing and operating the pumps.
Important safety information is highlighted as WARNING and CAUTION instructions; these instructions must be
obeyed. The use of WARNINGS and CAUTIONS is defined below.
WARNING
Warnings are given where failure to observe the instruction could result in injury or death to
people.
CAUTION
Cautions are given where failure to observe the instruction could result in damage to the equipment, associated
equipment and process
The units used throughout this manual conform to the SI international system of units of measurement; where
appropriate US equivalent units of measurement are also given. When flow rates are specified, the abbreviation
‘sccm’ is used to mean standard cubic centimetres per minute. This is a flow of 1 cm3 min-1 at an ambient temperature
of 0 °C and a pressure of 1013 mbar (1.013 x 105 Pa).
The following warning labels are on the pump:
Warning - refer to accompanying documentation.
Warning - risk of electric shock.
Warning - hot surfaces.
Protective conductor terminal.
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 1
Introduction
1
B800-00-880 Issue D
Introduction
1.2
General description
WARNING
Improper use of the equipment could cause damage to it or injury to people. The user is
responsible for the safe operation, installation and monitoring of the system.
WARNING
The drive contains electrolytic capacitors and, under certain fault conditions, may emit dangerous
fumes. Ensure that the drive is operated in a well-ventilated area.
CAUTION
Do not attempt to separate the controller from the pump since this will cause damage to the electrical
connections.
A nEXT pump consists of a turbomolecular pump with a permanently attached controller containing drive electronics.
The controller controls the electrical supply to the pump with the exception of standby speed control. It has no
manual controls and can only be operated through the logic interface. To operate the nEXT pump, connect it to the
customer control equipment and power supply or, alternatively, use the Edwards TIC Turbo Instrument Controller or
TIC Turbo Controller.
The controller drives the brush-less d.c. motor in the pump.
There are three main variants of the nEXT pump,

The ‘S’ or ‘Simplex’ variant contains only turbomolecular blades.

The ‘D’ or ‘Duplex’ variant contains turbomolecular blades and a drag mechanism allowing operation at
higher backing pressures than pure turbomolecular pumps.

The ‘T’ or ‘Triplex’ variant contains turbomolecular blades, a drag mechanism and a regenerative
mechanism. The regenerative stage offers the option to utilise ‘boost’ mode.
Also available is an ‘iD’ or ‘iT’ interstage variant, which provides an interstage port between the turbomolecular
blades and drag mechanism. For SEM and TEM applications, an ‘L’ variant is available, which offers considerably lower
vibration and stray magnetic field emissions.
nEXT pumps are supplied with an inlet screen fitted into the centering O-ring for ISO version pumps and into envelope
for CF version pumps. nEXT pumps with an NW25 interstage port are supplied with an inlet strainer that fits into the
interstage port. The inlet screen and inlet strainer protect the pump against damage that would be caused by debris
entering the pump.
The nEXT pumps have a vent port for venting the pump and vacuum system to atmospheric pressure. The pump is
supplied with a manual vent valve fitted; this can be replaced with a TAV5 or TAV6 solenoid-operated vent valve
(available as accessories – refer to Section 7). The TAV valve can be directly controlled by the on-board controller.
The nEXT pumps have a purge port: an inert purge gas can be introduced to protect the bearing and motor from
corrosion. An optional vent port adapter and purge restrictor can be fitted to the purge port to control the flow rate
of the purge gas and to filter the gas supply. (Refer to Section 7).
Air coolers and a water-cooling block are available as optional accessories to cool the nEXT pumps. (Refer to
Section 7).
Page 2
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B800-00-880 Issue D
Pump controller
The pump controller contains the drive electronics that control the pump operation and the TAV vent valve. There
is a connector socket on the side of the controller where the TAV vent valve can be plugged in. (Refer to Section 2.9)
The controller has three indicator LED’s that signal the general status, operation and service status of the pump.The
LEDs can be used for fault finding if a problem should occur. (Refer to Section 2.10)
The drive electronics system has a number of built-in safety features to protect the nEXT pumps from damage in the
event of sustained high pressure or temperature.

The electronics constantly monitors the temperature inside the controller and the temperature of the motor
within the pump. If either part becomes too hot, the controller reduces the power supplied to the pump
motor and the pump speed will drop. If the pump rotational speed falls below 50% of full speed, the
electronics may trip into a Fail condition, depending on the system configuration. (Refer to Section 1.4.3).

If the pump inlet pressure increases, the power supplied to the pump motor increases to counteract the gas
frictional load. However, when the built-in maximum power limit is reached, the speed of the pump will start
to drop. If the pump rotational speed falls below 50%% full speed, the electronics may trip into Fail
condition, depending on how the system has been configured. (Refer to Section 1.4.3).

In the event of an electrical supply failure, the controller uses the motor within the pump as a generator.
This means the nEXT pumps have their own regenerative supply and do not require a separate battery for
emergency power backup. The regenerated energy is used to maintain the electrical supply to the controller
and any vent valve or fan attached to the controller connector until the pump speed falls to below 50% of full
rotational speed: this will ensure that the vent valve remains shut until below 50% of full rotational speed
and will prevent the pump from venting at full speed. It also ensures that the serial link and signals on the
parallel interface remain active until the pump speed falls below 50%.
1.4
Operational features
In addition to the basic start and stop commands, the nEXT pumps have several other features that allow pump
operation to be tailored to a particular application. Refer to Table 10 for factory default settings of the parameters
discussed in the following sections.
OEM supplied pumps may have drive parameters and default user-selectable settings which differ from those stated
in this instruction manual in order to suit certain process requirements. Please contact the OEM in the first instance
for further information and advice.
1.4.1
Power limit setting
Select the maximum power that will be drawn by the pump (refer to Section 4.1.1). The more power supplied, the
quicker the pump will accelerate to reach full speed. If the application requires fast cycling, set the power limit to
the maximum value. If ramp time is not important in the application, use a lower power limit, down to a minimum
value (refer to Table 1).
Table 1 - Power limits
Pump
nEXT240, nEXT300 and nEXT400
Standard default setting
Maximum value
setting
Minimum value setting
160 W
200 W
50 W
Ensure that the power supply is capable of delivering sufficient power to the nEXT pump. By choosing a lower power
limit setting, a smaller power supply may be used. For more information, refer to Section 2.7.
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 3
Introduction
1.3
B800-00-880 Issue D
Introduction
1.4.2
Standby speed
In standby mode, the pump rotational speed is lower than the full rotational speed. The default setting for standby
speed is 70% of full speed. Note that in order to run at standby speed, the pump must also be in the start condition.
If the application does not require the pump to be running at maximum speed at all times, use the standby speed
feature rather than switching the pump off. This feature can be used for vacuum system tuning or as a system power
saving option.
The standby speed is a user-selectable value (refer to Section 4.1.4).
1.4.3
Timer
When the pump is started, an internal timer is automatically started within the drive electronics. The default timer
setting is 8 minutes. If the pump fails to reach 50% of full rotational speed within the timeout period, the controller
will signal a Fail and will decelerate the pump to rest. This feature prevents the controller from driving the pump at
maximum power for a long time. The pump may fail to reach 50% speed if the gas load is too high (for example if
there is a leak in the system), if the backing pump fails or if the pump is too hot.
The timeout period is a user-selectable feature (refer to Section 4.1.6). If the application requires the pump to ramp
up slowly, extend the timeout period. The timer is permanently enabled for ramp-up.
The timer has an additional function: if the pump rotational speed drops below 50% of full speed for any reason, the
pump time can be set to recover rather than trigger a fail condition. The timer starts as soon as the speed drops to
below 50% full speed. If, during the timeout period, the pump recovers to above 50% full speed then the timer will
be reset. If the pump rotational speed fails to recover by the end of the timeout period, the controller will trigger a
fail condition and will decelerate the pump to rest. When the pump is shipped, the timer function is enabled,
however, it can be disabled. With the timer disabled, the pump will fail and decelerate to rest as soon as pump
rotational speed falls below 50%.
1.4.4
Analogue output
The pump controller produces an analogue output for monitoring four different system parameters:

Measured pump rotational speed (default condition)

Measured motor power

Measured motor temperature

Measured controller temperature
The analogue output signal ranges from 0 to 10 V and is directly proportional to the system parameter (refer to
Section 2.8).
Connect the analogue output to a suitable meter or indicator to display the appropriate system parameter or connect
it to the customer control equipment (for example, to operate other components in the pumping system at preset
values).
Only one system parameter can be monitored at a time using the analogue output. However, it is easy to configure
the controller to monitor a different system parameter (refer to Section 4.1.7).
1.4.5
Automatic vent options
An Edwards TAV vent valve can be connected directly to the nEXT pump’s controller. The controller is capable of
providing a number of different venting options.
The drive electronics can control the rate of venting. Using this feature the pump can be vented from full rotational
speed in a controlled manner that will not damage the pump bearings. Once the pump rotational speed has dropped
to below 50% of maximum speed, it is safe to hard vent (open the vent valve fully).
Page 4
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B800-00-880 Issue D

Hard vent when rotational speed drops below 50%

Controlled vent when above 50% speed and hard vent below 50% speed

Hard vent immediately through a suitable restrictor
Controlled venting gives the benefit of a quicker ramp down time by controlling the vent rate through a single large
orifice across the pump speed range. A full list of the venting options is given in Section 3.9
In addition there is a feature that allows a delayed start of the nEXT pump. With this feature, the vent valve can be
closed before starting the nEXT pump. This allows the backing pump to reduce the pressure in the vacuum system
before starting the nEXT pump.
If the controller is not used to control a TAV vent valve, it can be used to run a fan instead. The controller can be
configured so that the fan is permanently enabled.
1.4.6
Normal speed setting
The normal speed is a user-selectable parameter that can be set anywhere from 50% to 100% of full rotational speed.
When the pump reaches normal speed, a signal is available on the normal pin of the logic interface connector. This
signal can be used to control the application since it shows that pump speed, and therefore vacuum performance,
has reached a specific minimum level. The default setting is 80% of full rotational speed. Refer to Section 4.1.5 for
instructions on altering the normal speed setting.
1.5
Logic interface
The pump controller can only be operated through the logic interface. The signals on the logic interface are of three
types:

Control inputs: these are switch-type signals that are used to control the pump

Status outputs: these outputs identify the status of the system

Analogue output: this provides a 0 – 10 V output for a number of pump parameters.
The logic interface has been designed to support both serial and parallel control and monitoring, operating through
one connector. For serial control either RS232 (default) or RS485 can be selected using the RS485/RS232 slide switch
located on the controller (refer to Section 3.7).
The logic interface can be plugged directly into the Edwards TIC Turbo Controller or TIC Turbo Instrument Controller
and then use the functionality that they provide. Alternatively, the logic interface can be connected to the customer
control system. The most useful arrangements are described in the sections below.
For more information about the logic interface, refer to Section 2.8.
1.5.1
Parallel control and monitoring
The simple parallel interface is a quick and easy way to control the pump. This is the same interface used on existing
24 V Edwards Turbo Pumps. The controls that are available to use are start and standby. The system status can be
monitored using the normal, fail and analogue output signals.
Note:
The serial enable switch MUST be open (no connection) and the slide switch must be in the RS232 position
(refer to Section 3.7).
Refer to Section 3.6 for more detailed instructions of how to use the parallel interface.
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 5
Introduction
There are many venting options available, including:
B800-00-880 Issue D
Introduction
A system operating with only a parallel connection is not capable of adjusting the configuration settings stored in the
controller (for example, power limit setting or controlled venting options). In this case, all these features would be
at their factory default settings. It is possible to manually adjust the standby speed if standby mode is selected,
however, the controller should be configured separately before fitting the nEXT pump to the system. This is covered
in more detail in Section 1.5.5.
1.5.2
Serial control and monitoring
The serial communications link provides complete control and monitoring by using just three signal lines. The serial
data lines share the same connector pins as the parallel signals standby and fail. The serial data lines can be
configured to provide an RS485 compliant or RS232 compatible interface by setting the position of the RS485/RS232
slide switch (refer to Section 3.7)
The serial enable signal MUST be linked to 0 V for the system to accept commands from the serial link. This is a safety
feature and acts as an interlock. For pure serial control, the parallel start signal will be left unconnected.
The controller will still provide the normal and analogue signals on the logic interface connector even when operating
under serial control. The status of the normal signal and the value of the system parameter on the analogue output
can also be obtained by interrogating the system status via the serial link.
For more information about the serial interface, refer to Section 3.7.
1.5.3
Serial control with parallel monitoring
Since normal and analogue signals remain available even using serial control, it is possible to control the pump via
the serial link whilst monitoring these signals in the parallel interface.
The serial link uses the same connector pins as the parallel signals standby and fail so these parallel control and
monitoring signals are not available. The serial enable signal MUST be linked to 0 V and the parallel start signal will
be left unconnected.
1.5.4
Parallel control with serial monitoring or serial configuration
This method of control is best for users who normally wish to operate the pump in parallel control mode but
occasionally want to adjust the configuration settings stored in the controller or to monitor operational status of the
pump via the serial link.
The serial enable signal must be linked to 0 V for serial communications to take place. Whilst operating under parallel
control with the serial link active, the parallel start control signal is available (as described in Section 1.5.1.) but the
standby control line is not since it is used as a serial data line.
If the serial enable line is deactivated at any time whilst the RS485/RS232 slide switch is in the RS232 position, the
serial link should also be disconnected. Edwards suggests making a special cable for serial communications that
includes a link between serial enable and 0 V. This way, serial enable is automatically activated when the cable is
connected and then deactivated when the cable is removed.
1.5.5
Controller configuration (serial configuration)
All the configuration settings stored within the controller are retained even when power to the nEXT pump is
removed. This means that it is possible to use a separate system to configure the controller before fitting the nEXT
pump to the application. This gives the benefit of tailoring the pump functionality to a customer application and
allows the pump to be operated using a simple parallel interface system.
To configure the nEXT pump, either use a customer simple serial system or use the Edwards TIC Turbo Controller or
Turbo Instrument Controller. The TICs have a feature which allows storage of a nEXT pump’s configuration. The
configuration can then be downloaded to another nEXT pump. This is useful when configuring a number of nEXT
pumps with the same settings before they are fitted to a system.
Page 6
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
The RS485/RS232 slide switch must be in the (default) RS232 position if the TIC is to be used to configure
the nEXT pump. Refer to Section 3.7.1.
The TIC is supplied with a WindowsTM based PC program which allows the nEXT pump to be configured from a single
PC. The program has a simple user interface which means that it is not necessary to use the ASCII message protocol
described in Section 3.7. The TIC PC program has a facility to save multiple nEXT pump configurations which can then
be downloaded into other nEXT pumps.
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Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 7
Introduction
Note:
B800-00-880 Issue D
This page has been intentionally left blank.
Page 8
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B800-00-880 Issue D
Technical data
2.1
General
Technical data
2
Table 2 - General data
General items
Reference data
Performance
Refer to Table 3, 4 and 5; Figure 1, 2 and 3
Dimensions
Refer to Figure 4, 5 and 6
Maximum inlet flange temperature
*
nEXT240
75 °C
nEXT300
80 °C
nEXT400
70 °C
Maximum permitted external magnetic field
5 mT Radial *
Pollution degree
EN61010 Pollution degree 2
Equipment type
Fixed equipment, for indoor use only
Enclosure protection (installed)
IP40
Reduce gas load when operating in magnetic field
2.2
Pumping media
WARNING
Vent dangerous gases and gas mixtures safely. Do not expose people to these gases. If pumping
hazardous gases or vapours, observe the safety recommendations of the supplier of the gas/
vapour.
WARNING
Do not use the nEXT pump to pump pyrophoric or explosive gas mixtures as it is not suitable for
this purpose. The pump and its connections are not designed to contain an explosion.
WARNING
In the interstage and booster versions of the nEXT pumps, gas pumped through the interstage port
will mix with gas pumped through the pump inlet. Ensure that the gases will not react or combine
to form dangerous gases and substances.
WARNING
Do not exceed the maximum continuous operating pressure. Doing so can result in dangerous rotor
temperatures and will shorten the life of the pump.
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 9
B800-00-880 Issue D
Technical data
WARNING
Do not expose any part of the human body to vacuum.
WARNING
Do not use a nEXT pump to pump mercury vapour and do not allow mercury (for example, from a
McLeod gauge) to come into contact with the pump. If mercury vapour is pumped, the pump rotor
may corrode and fail.
Note:
Concentrations of gases may be modified by the compression of the pump.
The pumps are designed to pump the following residual gases normally used in high-vacuum systems:







Air
Methane
Propane
Butane
Carbon monoxide
Nitrogen
Hydrogen






Carbon dioxide
Neon
Krypton
Helium
Ethane
Argon
The pump can be used to pump oxygen and water vapour, subject to the following conditions:

Oxygen – when the pump is purged by an inert gas, oxygen can be pumped at concentrations above 20% by
volume. Refer to Section 2.4 for Purge gas specification. However, if the pump is not purged, the oxygen
concentration must be less than 20% by volume.

Water vapour - ensure that vapour does not condense inside the pump; refer to Section 3.10.3.
If pumping a gas not listed above, contact the supplier for advice. If the supplier is not contacted, the pump warranty
may be invalidated. The pump is not suitable for pumping aggressive or corrosive gases.
Table 3 - nEXT 240 pumps technical data
nEXT240D
ISO100
nEXT240D
CF100
nEXT240T
ISO100
nEXT240T
CF100
5.7 kg
8.8 kg
6 kg
9.1 kg
DN100ISO-K
DN100CF
DN100ISO-K
DN100CF
DN25NW
DN25NW
DN25NW
DN25NW
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
Interstage port
DN25NW
DN25NW
DN25NW
DN25NW
Booster port
DN25NW
DN25NW
DN25NW
DN25NW
N2
He
H2
240 l/s
230 l/s
165 l/s
240 l/s
230 l/s
165 l/s
240 l/s
230 l/s
165 l/s
240 l/s
230 l/s
165 l/s
N2
He
H2
>1 x 1011
3 x 105
1 x 104
>1 x 1011
3 x 105
1 x 104
>1 x 1011
1 x 106
1.5 x 104
>1 x 1011
1 x 106
1.5 x 104
Parameter
Mass
Inlet flange
Outlet flange
Vent port
Purge port
Inlet pumping speed
Inlet compression ratio
Page 10
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B800-00-880 Issue D
Parameter
nEXT240D
ISO100
nEXT240D
CF100
nEXT240T
ISO100
nEXT240T
CF100
13 l/s
13 l/s
11 l/s
13 l/s
13 l/s
11 l/s
13 l/s
13 l/s
11 l/s
13 l/s
13 l/s
11 l/s
-
-
26 m3h-1
24 m3h-1
26 m3h-1
24 m3h-1
<6 x 10-8 mbar
<5 x 10-10 mbar
<6 x 10-8 mbar
<5 x 10-10 mbar
Interstage pumping sSpeed
N2
He
H2
Peak booster pumping speed (nitrogen)
RV12 backing pump
XDS10 backing pump
Ultimate pressure*
*
Ultimate pressure 48 hours after bakeout for CF version and without bakeout for ISO version with 2-stage
rotary vane backing pump.
Note:
Pumping speeds quoted are without an inlet screen.
Table 4 - nEXT 300 pumps technical data
nEXT300D
ISO100
nEXT300D
CF100
nEXT300T
ISO100
nEXT300T
CF100
5.7 kg
8.5 kg
6 kg
8.8 kg
DN100ISO-K
DN100CF
DN100ISO-K
DN100CF
DN25NW
DN25NW
DN25NW
DN25NW
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
Interstage port
DN25NW
DN25NW
DN25NW
DN25NW
Booster port
DN25NW
DN25NW
DN25NW
DN25NW
N2
He
H2
300 l/s
340 l/s
280 l/s
300 l/s
340 l/s
280 l/s
300 l/s
340 l/s
280 l/s
300 l/s
340 l/s
280 l/s
N2
He
H2
>1 x 1011
1 x 106
5 x 104
>1 x 1011
1 x 106
5 x 104
>1 x 1011
3 x 106
1 x 105
>1 x 1011
3 x 106
1 x 105
13 l/s
13 l/s
11 l/s
13 l/s
13 l/s
11 l/s
13 l/s
13 l/s
11 l/s
13 l/s
13 l/s
11 l/s
-
-
26 m3h-1
24 m3h-1
26 m3h-1
24 m3h-1
<6 x 10-8 mbar
<5 x 10-10 mbar
<6 x 10-8 mbar
<5 x 10-10 mbar
Parameter
Mass
Inlet flange
Outlet flange
Vent port
Purge port
Inlet pumping speed
Inlet compression ratio
Interstage pumping speed
N2
He
H2
Peak booster
Pumping speed (nitrogen)
RV12 backing pump
XDS10 backing pump
Ultimate pressure*
*
Ultimate pressure 48 hours after bakeout for CF version and without bakeout for ISO version with 2-stage
rotary vane backing pump.
Note:
Pumping speeds quoted are without an inlet screen.
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Page 11
Technical data
Table 3 - nEXT 240 pumps technical data (continued)
B800-00-880 Issue D
Technical data
Table 5 - nEXT 400 pumps technical data
nEXT400D
ISO160
nEXT400D
CF160
nEXT400T
ISO160
nEXT400T
CF160
6.5 kg
9.5 kg
6.8 kg
9.8 kg
DN160ISO-K
DN160CF
DN160ISO-K
DN160CF
DN25NW
DN25NW
DN25NW
DN25NW
Vent port
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
Purge port
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
⅛ inch BSPP
Interstage port
DN25NW
DN25NW
DN25NW
DN25NW
Booster port
DN25NW
DN25NW
DN25NW
DN25NW
N2
He
H2
400 l/s
390 l/s
325 l/s
400 l/s
390 l/s
325 l/s
400 l/s
390 l/s
325 l/s
400 l/s
390 l/s
325 l/s
N2
He
H2
>1 x 1011
1 x 108
5 x 105
>1 x 1011
1 x 108
5 x 105
>1 x 1011
>1 x 108
1 x 106
>1 x 1011
>1 x 108
1 x 106
N2
He
H2
13 l/s
13 l/s
11 l/s
13 l/s
13 l/s
11 l/s
13 l/s
13 l/s
11 l/s
13 l/s
13 l/s
11 l/s
-
-
26 m3h-1
24 m3h-1
26 m3h-1
24 m3h-1
<1 x 10-8 mbar
<1 x 10-10 mbar
<1 x 10-8 mbar
<2 x 10-10 mbar
Parameter
Mass
Inlet flange
Outlet flange
Inlet pumping speed
Inlet compression ratio
Interstage pumping speed
Peak booster
Pumping speed (nitrogen)
RV12 backing pump
XDS10 backing pump
Ultimate pressure*
*
Ultimate pressure 48 hours after bakeout for CF version and without bakeout for ISO version with 2-stage
rotary vane backing pump.
Note:
Page 12
Pumping speeds quoted are without an inlet screen
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Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Parameter
nEXT240D nEXT240T nEXT300D nEXT300T nEXT400D nEXT400T
Critical backing pressure N2
Critical backing pressure He
9.5 mbar
20 mbar
7 mbar
Critical backing pressure H2
Maximum continuous inlet flow
(at ultimate backing pressure)*
2.5 mbar
9.5 mbar
20 mbar
10 mbar
20 mbar
8.5 mbar
7.5 mbar
8.5 mbar
8.5 mbar
8.5 mbar
3 mbar
2.9 mbar
3 mbar
3 mbar
3 mbar
45 sccm
55 sccm
95 sccm
65 sccm
105 sccm
50 sccm
Force air cooling (35 C Ambient)
30 sccm
50 sccm
115 sccm
100 sccm
90 sccm
105 sccm
Natural convection
(30 °C Ambient)
10 sccm
10 sccm
35 sccm
25 sccm
45 sccm
25 sccm
Water cooling (40 °C Ambient)
35 sccm
35 sccm
63 sccm
42 sccm
70 sccm
49 sccm
Force air cooling (35 °C Ambient)
20 sccm
28 sccm
76 sccm
70 sccm
70 sccm
77 sccm
Natural convection
(30 °C Ambient)
7 sccm
7 sccm
20 sccm
20 sccm
28 sccm
20 sccm
6 mbar
2.75 mbar
6.75 mbar
4.75 mbar
7.5 mbar
4 mbar
4.75 mbar
2.75 mbar
7 mbar
8 mbar
7.5 mbar
9 mbar
1 mbar
0.4 mbar
2.75 mbar
1 mbar
4 mbar
1.25 mbar
4.75 mbar
2.75 mbar
6 mbar
3.75 mbar
6.5 mbar
4 mbar
3 mbar
1.5 mbar
6.5 mbar
7 mbar
6.5 mbar
8 mbar
0.5 mbar
0.2 mbar
2 mbar
0.75 mbar
3 mbar
1.2 mbar
Nitrogen:
Water cooling (40°C Ambient)†
°
Argon:
Maximum continuous backing
pressure (at ultimate inlet pressure)*
Nitrogen:
Water cooling (40 °C Ambient)†
Force air cooling (35
°C
Ambient)
Natural convection
(30 °C Ambient)
Argon:
Water cooling (40 °C Ambient)
Force air cooling (35
°C
Ambient)
Natural convection
(30 °C Ambient)
Recommended backing pump
RV12 / XDS10
Vertical and upright to horizontal ± 2 °
Operation attitude
Vertical only for ‘nL’ variant pumps
Normal rotational speed
60,000 revolutions per minute
Starting Time to 90% Speed (160 W)
115 sec
140 sec
155 sec
175 sec
175 sec
200 sec
Starting Time to 90% Speed (200 W)
95 sec
120 sec
135 sec
150 sec
150 sec
170 sec
Sound pressure level (1 metre away)
*
†
< 45 dB(A) ± 3dB(A) Declared dual number noise emission values in
accordance with ISO4871
Values for maximum continuous inlet pressure obtained using a RV12 backing pump at sea level in negligible
magnetic field. Values for maximum continuous backing pressure obtained under no flow conditions at sea
level in negligible magnetic field. Refer to Section 3.9 for cooling conditions. Above these pressures,
rotational speed drops below nominal.
Cooling water temperature 15 oC at a flow rate of 30 l hr-1.
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Page 13
Technical data
Table 6 - nEXT pumps technical data
B800-00-880 Issue D
Technical data
Figure 1 - nEXT240 performance curve
Figure 2 - nEXT300 performance curve
Page 14
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B800-00-880 Issue D
Technical data
Figure 3 - nEXT400 performance curve
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Page 15
B800-00-880 Issue D
Technical data
Figure 4 - nEXT 240 dimensions (mm)
Page 16
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B800-00-880 Issue D
Technical data
Figure 4 - nEXT 240 dimensions (mm) - figure legend
1. Earth point
2. LED indicators on drive unit
3. Removable cap RS485/RS232 switch vent valve
socket
4. Base mounting holes and fan mountings
5. Booster port B
6. Interstage port
7. Booster port A
8. Backing port
9. 24/48 V Supply
10. Body purge port
11. Electrical drive unit
12. Envelope vent port ⅛ inch BSP
13. Envelope vent
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Page 17
B800-00-880 Issue D
Technical data
Figure 5 - nEXT 300 dimensions (mm)
Page 18
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B800-00-880 Issue D
Technical data
Figure 5 - nEXT 300 dimensions (mm) - figure legend
1. Earth point
2. LED indicators on drive unit
3. Removable cap RS485/RS232 switch vent valve
socket
4. Base mounting holes and fan mountings
5. Booster port B
6. Interstage port
7. Booster port A
8. Backing port
9. 24/48 V Supply
10. Body purge port
11. Electrical drive unit
12. Envelope vent port ⅛ inch BSP
13. Envelope vent
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Page 19
B800-00-880 Issue D
Technical data
Figure 6 - nEXT 400 dimensions (mm)
Page 20
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B800-00-880 Issue D
Technical data
Figure 6 - nEXT 400 dimensions (mm) - figure legend
1. Earth point
2. LED indicators on drive unit
3. Removable cap RS485/RS232 switch vent valve
socket
4. Base mounting holes and fan mountings
5. Booster port B
6. Interstage port
7. Booster port A
8. Backing port
9. 24/48 V Supply
10. Body purge port
11. Electrical drive unit
12. Envelope vent port ⅛ inch BSP
13. Envelope vent
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Page 21
B800-00-880 Issue D
Technical data
2.3
Vent gas specification and vent control data
Although the pump may be vented to atmosphere, high relative humidity of the air may greatly increase the
subsequent pump-down time. To reduce pump-down times, vent with dry, clean gases. Refer to Section 3.9 for a
description of the vent options and the vent valve connection. Refer to Section 4.1.3 for configuring the venting
options.
Table 7 - Vent gas specification and vent control
Vent gas specification and control
Reference data
Vent gas
Dry air, nitrogen, argon or other inert gases
Maximum dew point at atmospheric pressure
-22 °C
Maximum size of particulates
1 µm
Maximum concentration of oil
0.1 parts per million
Recommended time for rotational speed to reach 50%
> 15 seconds
Maximum allowed rate of pressure rise
Refer to Figure 7
Figure 7 - Max allowed rate of pressure rise during venting: pressure against time (pump initially at full speed)
Page 22
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B800-00-880 Issue D
Purge gas specification
Table 8 - Purge gas specification
Purge gas specification
Reference data
Purge gas
Dry air, nitrogen, argon or other inert gases
Maximum dew point at atmospheric pressure
-22 °C
Maximum size of particulates
1 µm
Maximum concentration of oil
0.1 parts per million
Allowable purge gas flow (when required)
20 to 50 sccm (0.33 to 0.84 mbar l s-1 or 33 to 84 Pa l s-1)
Recommended purge gas flow
25 sccm (0.42 mbar l s-1, 42 Pa l s-1)
Maximum allowable purge gas supply pressure
1 bar (gauge); 14.5 psig, 2 x 105 Pa
Table 9 - Cooling water specification
Cooling water specification
Reference data
Quality
Mechanically clean and optically clear with no deposits
or turbidity
pH value
6.0 to 8.0
Maximum calcium carbonate concentration
75 parts per million
Maximum chloride concentration
100 parts per million
Minimum oxygen concentration
4 parts per million
Minimum cooling water flow rate (at 15 °C)
15 l hr-1
Water temperature
10 to 20 °C
Maximum water pressure
5 bar (gauge), 73.5 psig, 6 x 105 Pa
Materials exposed to cooling water
Nickel plated brass
2.5
Cooling water
Refer to Table 9 for the cooling water specification. The cooling water supply should correspond to a typical highquality drinking water specification. Check with the water supply authority if there is any doubt about the quality of
the supply.
2.6
Materials exposed to gases pumped
The following materials and component types are exposed to the gases pumped: Aluminium alloys, stainless steels,
fluoroelastomer and nitrile O-rings, hydrocarbon lubricant, rare earth magnets, silicon nitride, carbon fibre
reinforced epoxy resin, fire retardant polypropylene, polyamide, PVC, Titanium, Silicon, Torlon and Ceramic.
© Edwards Limited 2013. All rights reserved.
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Page 23
Technical data
2.4
B800-00-880 Issue D
Technical data
2.7
Electrical data
nEXT pumps can be driven either by the customer system or by the Edwards TIC Turbo Instrument Controller or TIC
Turbo Controller.
If using the customer system, the size of the power supply required depends on the application. The power limit
setting determines how quickly the pump ramps up and dictates the size of the power supply required. If serial
communications or access to an Edwards TIC is available, the power limit setting of the nEXT pump can be selected.
Refer to Table 10 for the maximum power limit settings for nEXT pumps. If the application requires rapid cycling of
the pump, faster ramp times can be achieved if the power supply delivers higher current, up to a maximum in
accordance with Table 10.
If the facility to adjust the power limit setting is not available, use a power supply capable of delivering enough
current to meet the Edwards factory default power limit setting, shown in Table 10.
If the nEXT pump is driven using an Edwards TIC, be aware that there are several variants. Contact Edwards to
determine which is most suitable for the application.
2.8
Logic interface connector
nEXT pumps have a 15-way logic interface connector on the end of the logic interface cable. The logic interface
connector can be plugged directly into the Edwards TIC Turbo Instrument Controller or TIC Turbo Controller.Use a
suitable connector mating half (not supplied) to connect the nEXT pump to the customer equipment. Refer to
Table 10 for the connector mating half type, to Table 11 for Logic Interface connector pins for the electrical
connections and to Figure 8 for the connector interface circuit diagrams.
Table 10 - Logic interface technical data
Logic interface item
Connector *
15-way D-type male
nEXT pumps electrical supply:
Allowable voltage range
(including any ripple)
24 - 48 V d.c. +5%, -10%
(21.6 to 50.4 V d.c.)
Maximum voltage ripple
0.5 V r.m.s.
Fuse rating
10 A for 24 V d.c. supply
5 A to 10 A for 48 V d.c. supply
Type 'T' IEC approved or
Time delay fuse UL/CSA approved
Limit on power drawn from supply.
Factory default setting
160 W
Maximum setting
200 W
Minimum setting
50 W
Accuracy of power regulation
+/- 10 W
Start and serial enable control inputs:
Enabled control voltage: low (close)
0 to 0.8 V d.c. (Iout = 0.55 mA nominal)
Disabled control voltage: high (open)
4 to 26.4 V d.c. (Internal pull up to 6.4 V nominal)
Standby control input
Enabled control voltage: low (close)
0 to 0.8 V d.c. (Iout = 0.29 mA nominal)
Disabled control voltage: high (open)
4 to 26.4 V d.c. (Internal pull up to 3.2 V nominal)
Page 24
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Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Technical data
Table 10 - Logic interface technical data (continued)
Logic interface item
Analogue output
Output voltage
0 to 10 V d.c. (directly proportional to measured
parameter)
Motor speed: 0 - 1000 Hz (0-100%)
Input power: 0 - 200 W
Motor temperature: 0 - 100 °C
Controller temperature: 0 - 100 °C
Voltage accuracy
± 0.2 V
Output current
 5 mA for specified accuracy
NORMAL status output:
Type
Open collector transistor plus pull up resistor. Refer to
Figure 8
< Normal speed (default 80%)
Off (2.2 k internal pull up to 12 V d.c.)
Normal speed
On (<0.8 V d.c. sinking 20 mA)
Current rating
20 mA to 0 V
Voltage rating
28.8 V d.c. maximum external pull up voltage
FAIL status output:
*
Type
Open collector transistor plus pull up resistor. Refer to
Figure 8.
Fail
Off (3.3 k pull up to 12 V d.c.)
OK
On (< 0.1 V d.c. sinking 1.7 mA,
< 0.8 V d.c. sinking 20 mA)
Current rating
20 mA to 0 V
Voltage rating
28.8 V d.c. maximum external pull up voltage
Mating half of connector not supplied.
Table 11 - Logic interface connector pins
Pin Number Signal
Polarity Use
2
0 V Control reference
-
0 V reference for all control and status signals below
3
START/STOP control input
-
Connect to Pin 2 to start pump
4
STANDBY control input /
Serial RX/RS485 A-
-
Connect to Pin 2 to enable standby speed when serial enable
is inactive and RS485/RS232 switch is in the RS232 position.
5
Serial enable
-
Connect to Pin 2 to enable the serial link.
7
FAIL / Serial TX/RS485 B+
-
Logic high when fail condition exists and serial enable is
inactive and RS485/RS232 switch is in the RS232 position.
9
Analogue output
10
Chassis / Screen
-
Screen
12
Chassis / Screen
-
-
15
NORMAL status output
-
Logic low when pump rotational speed is at normal speed or
above
8, 13, 14
Electrical supply: 0 V
-
1, 6, 11
Electrical supply: 24-48 V
Positive 0 - 10 V output proportional to measured output
Positive
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Page 25
B800-00-880 Issue D
Technical data
Figure 8 - Interface circuits for nEXT turbo pump controllers
Page 26
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B800-00-880 Issue D
Controller connector socket
The nEXT pump has a 3-way controller connector socket in the side of the controller. When the pump is shipped, this
connector is concealed by a black protective cover. If the connector will be used, the cover should be removed by
levering with a small screwdriver. The mating plug for this connector is supplied with the pump.
The connector is intended to drive a vent valve or fan connected to the three pins. The connector mating plug is
shown in Figure 9, with the polarity of the pins marked when the vent valve/fan is energised.
The 24 V d.c. output on the controller connector is protected against overload or short circuit to 0 V d.c./24 V d.c.
Rtn/chassis. The output is guaranteed to supply the current given in Table 12, but for higher currents the output
voltage will be reduced and may turn off completely to limit current.
Table 12 - Controller technical data
Description
Data
Connector plug
Phoenix part number FK-MC1881338
Voltage output
24 V d.c. -25%, +10% (18 V d.c. to 26.4 V d.c.)
Current output
500 mA
Figure 9 - Controller connector showing pin numbers
Pin number
Signal
Polarity
1
24 V d.c. Out
+
2
Chassis
3
24 V d.c. Rtn
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-
Page 27
Technical data
2.9
B800-00-880 Issue D
Technical data
2.10
Indicator LED’s
The nEXT pump has three indicator LED’s, shown in Figure 12.
Table 13 - Indicator LED’s
LED
Description
Normal LED
This green LED remains when the pump rotational speed
is above the normal speed setting, irrespective of
whether the pump is accelerating or decelerating.
Status LED
This yellow LED flashes with a 50% duty cycle at the
rotational frequency of the pump motor. At high speeds
it appears continuously on.
The LED switches off when the rotational speed is very
low or stopped.
If a service is due, this LED flashes in a sequence to
indicate which service operation is required. Refer to
Section 5.5.
Alarm LED
This red LED flashes in a sequence to indicate an error
code if a fail condition is preventing pump operation.
The error codes can be used for fault finding as
described in Section 5.5.
Note:
2.11
If an external electrical load is connected to the normal output line, the Normal LED may illuminate.
Operating and storage environment
Table 14 - Operating and storage environment
Range
Data
Ambient operating temperature range
5 °C to 35 °C
Ambient operating humidity range
10 to 90% RH (non-condensing)
Maximum operating altitude
3000 m
Ambient storage temperature range
-30 °C to 70 °C
Page 28
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B800-00-880 Issue D
Installation
WARNING
The controller cable should not be used as a lifting device. Do not attempt to lift or support the
pump using the cable.
3.1
Unpack and inspect
WARNING
Use suitable lifting equipment to move the pump. Failure to do so can cause injury to people and
damage to the equipment. Refer to Section 2.2 for the mass of the pump.
WARNING
The inlet screen is a coarse filter for debris and should not be used as a finger guard.
Take care when unpacking the pump to avoid excessive shocks that could damage the bearings and reduce the life
of the pump. The pump is supplied with the inlet and outlet sealed to prevent entry of dust and vapour. Do not
remove these seals until the pump is installed on the vacuum system.
Remove all packing materials and check the pump. If the pump is damaged, notify the supplier and the carrier in
writing within three days; state the Item Number of the pump together with the order number and the supplier's
invoice number. Retain all packing materials for inspection. Do not use the pump if it is damaged.
Check that the package contains the items listed in Table 15. If any of these items is missing, notify the supplier in
writing within three days.
If the pump is not to be used immediately, store the pump in suitable conditions, following the procedure described
in Section 6.1.
Do not discard the packing materials; retain them to re-package the pump if it is returned for service.
Table 15 - Checklist of components
Quantity
3.2
Description
Check ()
1
nEXT pump with inlet screen fitted (fitted to CF pumps only)

1
Inlet seal (either trapped O-ring with integral inlet screen, Coseal or copper compression gasket suitable for the inlet flange
type)

1
Connector (24 V) - for driving accessories from Controller socket

1
Inlet strainer (fitted in the NW25 interstage and booster port
only)

Typical installation
A typical pumping system with a nEXT pump is shown in Figure 10.
The accessories available for the nEXT pumps are detailed in Section 7.4; the accessories are shown in Figure 20
and 21.
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Page 29
Installation
3
B800-00-880 Issue D
Installation
3.3
Connection to the vacuum system
WARNING
Ensure that all wires and piping are routed appropriately to avoid the risk of tripping.
WARNING
Install the pump in the vacuum system before the logic interface cable is connected to the control
equipment and before the electrical supply is connected. This will ensure that the pump cannot
operate accidentally causing injury.
Edwards recommends leak testing the system after installation has been completed.
Figure 10 - Typical pumping system with a nEXT pump
1.
2.
3.
4.
5.
6.
7.
8.
9.
Page 30
Vacuum system
High-vacuum gauge
Vibration damper
Inlet screen
nEXT pump
Backing valve
Vacuum gauge
Flexible bellows
Foreline trap
10. Rotary backing pump
11. Mist filter
12. Vent valve
13. Alternative position for
vent valve
14. Air cooler
15. PRX purge restrictor
16. Regulated purge gas supply
17. WCX water cooler and connections
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B800-00-880 Issue D
Inlet screen (supplied fitted on CF only)
WARNING
Removal of the inlet screen will expose the risk of injury from sharp edges.
Remove the inlet screen only if there is no possibility that debris can fall into the pump. If the inlet screen is removed,
the pumping speed will increase by up to 10% for course and 20% for fine inlet screens. Since the screen protects the
pump from contamination, do not remove the inlet screen until the pump is mounted on the system.
To remove the inlet screen from a pump with CF inlet flange, use a bent wire hook or small screwdriver to carefully
lever the inlet screen out from the inlet flange.
To replace an inlet screen, locate it as centrally as possible over the CF inlet flange and then, with fingers applying
equal pressure around the edge of the screen, push it firmly downwards. If they are not already in place, the tangs
must be snapped into the locating groove in the inlet flange using a suitable tool to press them into position. For ISO
flanged pumps, Edwards supplies a combination inlet screen/trapped O-ring.
3.3.2
Mechanical fixing
WARNING
Do not operate the pump until it is securely fixed. If the pump seizes, the stored energy of the
rotor can cause rapid movement of the pump, which may cause further damage and injury to
people.
WARNING
The inlet screen is a coarse filter for debris and should not be used as a finger guard.
WARNING
Position system viewports and vulnerable components away from the pump inlet to safeguard
against damage from possible ejected parts in the unlikely event of a pump rotar failure.
There are two ways in which the nEXT pumps can be securely fixed. The ideal fixing for a nEXT pump is via its inlet
flange to a rigid, firmly fixed vacuum system - refer to Section 3.3.3. If this is not possible because of the nature of
the vacuum system, then the base of the pump must be fixed to a firm support. Refer to Section 3.3.4 for instructions
on base mounting the pump.
3.3.3
Inlet connection and orientation
The pump can be securely fixed to the vacuum system via the inlet flange. The pump can be mounted in any attitude
from the vertical and upright through to horizontal (± 2 °). If the pump is mounted horizontally and is used with a
rotary vane backing pump, ensure a foreline trap is installed to prevent condensed oil in the backing line from
entering the turbo pump. If it is not possible to fit a foreline trap, mount the pump with the backing port pointing
vertically downward (+/- 45 °).
Make sure that the pump inlet and all components fitted to the pump inlet are clean and dust-free. If the pump inlet
is not kept clean, the pump-down time may be increased.
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Page 31
Installation
3.3.1
B800-00-880 Issue D
Installation
The inlet connections for the nEXT pump are CF flange, ISO flange and VG flange.

If the pump has a CF flange, use the copper compression gasket supplied with the pump and use a full
complement of bolts to connect the inlet flange of the pump to the vacuum system.

If the pump has an ISO flange, use the Edwards combination inlet screen/trapped O-ring supplied with the
pump and use a minimum of four claw clamps (each torqued to 30 Nm) to connect the inlet flange of the
pump to the vacuum system. Alternatively, use a rotatable collar and the combined inlet screen and trapped
O-ring supplied with the pump to connect the inlet flange of the pump to the vacuum system; use a full
complement of bolts with the rotatable collar.

If the pump has a VG flange, use a full complement of 8x M10 bolts and washers to connect the pump to the
vacuum system. Flange fixings bolts must be a minimum of 700 MPa tensile strength and evenly tightened in
a cross pattern in 3 tightening stages to a final torque of 30 Nm to ensure even compression of the O-ring and
clamping of the flanges.
All inlet flange bolts must be re-tightened once the system is under vacuum. Ensure that no torques or other forces
are transmitted to the pump from the vacuum system or the associated pipelines. If necessary, fit an inlet vibration
damper between the pump inlet and the vacuum system. In this case, fix the base of the pump to a firm support, as
described in Section 3.3.4.
3.3.4
Base mounting
The base of the nEXT pump can be fixed to a firm support using the tapped fixing holes. Refer to Figure 4, 5 and 6
for fixing hole details.
Note:
The four rubber feet must be removed from the four tapped fixing holes before the pump can be base
mounted.
The following requirements should be met to ensure the pump remains secure in the event of a total pump seizure:
Support must withstand a destructive torque of:
Fixing screws:
Screw engagement length:
Fastening torque:
6 KNm
4 off M8 to ISO898-1 strength class 12.9
(nom. tensile strength 1200 MPa)
6 mm minimum
15 Nm (1.53 kgf.m)
This method of fixing must be used if the pump supports the weight of the vacuum system. The weight of the vacuum
system must be no more than 20 kg.
3.3.5
Backing connection
WARNING
Ensure safe ducting of the backing line if oil mist or hazardous substances are present.
WARNING
To avoid over-pressurising the pump, the exhaust line should not be restricted when venting from
a positive pressure gas supply.
CAUTION
Do not use the nEXT pumps with a backing pressure below 5 x 10-4 mbar (5 x 10-2 Pa). Lower backing pressures
will increase the evaporation rate of the lubricating oil and so may reduce the life of the bearings.
Page 32
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B800-00-880 Issue D
Edwards recommends using an Edwards EM, RV or XDS Scroll backing pump. The recommended size of backing pump
required is indicated in Table 6. A larger or smaller backing pump may also be suitable, depending upon the
application it is intended for.
The nEXT pumps are suitable for use with diaphragm backing pumps although the effect of higher backing pressure
on the pump's performance and cooling requirements should be noted. Refer to Table 6 and Section 2.1.
3.3.6
Interstage connection (variants only)
Use suitable vacuum tube and connectors to connect the interstage port to the vacuum system or to the outlet flange
of another turbo or compound turbomolecular pump (if using an ‘i’ nEXT pump to back another pump). Leave the
inlet strainer in the interstage port, unless it is certain that debris cannot be drawn into the interstage port.
3.4
Purge gas connection
3.4.1
Connect the purge gas
To supply a purge gas to the pump, remove the plug fitted in the purge port, fit a vent port adaptor (refer to
Section 7.4) and connect the purge gas supply to the vent port adaptor. The purge gas must comply with the
specification given in Section 2.4.
3.4.2
Recommended purge gas flow
The recommended purge gas flow for typical applications is 25 sccm (0.42 mbar l s-1, 42 Pa l s-1). This flow will protect
the pump when pumping oxygen in concentrations above 20% by volume.
The flow rate of the purge gas must be limited to the allowed range, specified in Section 2.4. To limit the flow rate,
use a flow controller or a pressure regulator and calibrated flow restrictor. The PRX10 purge restrictor accessory
(refer to Section 7.4) is suitable for this purpose.
3.5
Electrical installation
3.5.1
Introduction
WARNING
Ensure the electrical installation of the nEXT pump conforms with local and national safety
requirements. It must be connected to a suitably fused and protected electrical supply with a
suitable earth (ground) point.
The electrical installation must be carried out by a qualified person. Always make the electrical connections to the
nEXT pump after the pump has been installed on the vacuum system. Always disconnect all electrical connections
from the nEXT pump before removing it from the vacuum system.
Earth the pump using the connection provided and refer to Section 3.5.2.
The nEXT pump can be operated using the Edwards TIC Turbo Instrument Controller or TIC Turbo Controller (refer to
Section 3.5.3). The nEXT pump can also be controlled using the customer system. Refer to Section 3.5.4 for
information about control and to Section 3.5.5 for instructions on how to connect the electrical supply.
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Page 33
Installation
Use suitable vacuum tubing and connectors to connect the NW flange of the backing port to the backing pump. If
necessary, use flexible pipe or bellows to reduce the transmission of vibration from the backing pump to the nEXT
pump.
B800-00-880 Issue D
Installation
3.5.2
Earth (ground) connections
Edwards recommends fitting a separate earth (ground) conductor to earth the nEXT pump. Use an un-insulated braid
or a separate insulated green/yellow conductor with a minimum 10 AWG (5.3 mm2) conductor to comply with US and
Canadian installation codes, and use the M5 x 10 screw and shake proof washer supplied (fitted to the earth hole on
the pump) to secure the earth conductor to the pump. The impedance between the pump body and the earth
connection point must be < 0.1 Ohm.
3.5.3
Connect the logic interface to the TIC
If an Edwards TIC Turbo Instrument Controller or a TIC Turbo Controller is used to power and control the pump, the
nEXT pump logic interface cable connects directly into the back of the TIC. Refer to the TIC Instruction Manual for
further information.
The RS485/RS232 slide switch must be in the RS232 position if the TIC is to be used to control the nEXT pump. Refer
to Section 3.7.1. If the switch is in the RS485 position, the TIC will connect to the pump in parallel mode, indicating
the pump type as nEXTp. The serial connection will be disabled but start and stop will be possible.
3.5.4
Connect the logic interface to the customer control equipment
If operating the nEXT pump using the customer control system, use a suitable connector mating half (not supplied),
to connect the control equipment to the connector on the logic interface cable (refer to Table 10). When making the
electrical connections to the nEXT pump described in the following sections, refer to Table 11 for full details of the
logic interface connector pins.
The nEXT pump can be controlled using a hardware parallel control interface and/or via commands sent over a serial
interface.
If the nEXT pump is controlled using the hardware parallel interface, refer to Section 3.6 for more information. If
the serial interface is used, see the instructions given in Section 3.7. The logic interface provides the facility to work
with a mixture of parallel and serial control, refer to Section 3.8.
3.5.5
Connect the electrical supply
WARNING
This product requires a separate power supply (not included). The power supply should be
adequately protected against a hazardous live condition (for example, in case of a short circuit).
WARNING
Incorporate a suitable isolation device in the electrical supply. Locate the switch in an easily
accessible position and mark it as the disconnecting device for the nEXT pump. If an isolation
device is not provided, it will not be possible to switch the nEXT pump off in an emergency.
WARNING
Incorporate a suitable fuse as specified in Section 2.8, in the 24 - 48 V supply line to the nEXT
pump. To fully protect the pump in case of a fault, a suitable rated fuse should be used - refer to
Table 10. The power supply should have a current rating capable of blowing the fuse. If a fuse is
not provided and a fault develops, the nEXT pump may develop a hazardous surface temperature
or present a fire hazard.
Page 34
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B800-00-880 Issue D
Do not exceed the maximum supply voltage. Excessive supply voltage will cause permanent
damage to the control electronics and may result in a mechanical hazard in some failure
conditions.
WARNING
When connecting the nEXT pump to the power supply, ensure that all 3 pins for the 24 - 48 V
connection and all 3 pins for the 0 V connection on the customer connector mating half are
connected to the power supply.
Refer to Figure 11 for a schematic diagram of the logic interface connections.
The electrical supply for the nEXT pump must meet the requirements of BS EN 61010-1 / C22.2 1010-1. Ensure that
hazardous voltages as defined in EN61010 cannot be present on the electrical interface to the nEXT pump.
The nEXT pump 0 V is not referenced to earth (ground). Ensure that there is only one path between 0 V and earth.
Multiple connections between 0V and earth must be avoided in order to avoid unexpected offset voltages on control
and status signals and possible problems with serial communications. If no other connection is present between 0 V
and earth, the connection should be made at the power supply. Be aware that other electrical equipment connected
to the system could introduce a connection between 0 V and earth, for example a personal computer or measuring
equipment.
Refer to Table 11 - logic interface connector pins when connecting the electrical supply to the customer connector
mating half.
Figure 11 - Logic interface connections - parallel control
1.
2.
3.
4.
5.
Note:
24 V d.c. electrical supply
Fuse
Optional LED indicator - system OK
Optional LED indicator - normal speed
Current limit resistor for LED
6.
7.
8.
9.
nEXT pump logic interface
Start switch
Optional standby switch
Optional voltmeter
to monitor analogue output
The pump controller may be supplied from voltages above 24 V as specified in Table 10, however the
circuitry connected to the normal and fail lines must still respect the maximum external pull up voltage
rating given in Table 10.
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Page 35
Installation
WARNING
B800-00-880 Issue D
Installation
3.6
Connection for parallel control and monitoring
CAUTION
If using the normal and fail lines to drive the coils of d.c. relays, include a back EMF suppression diode in parallel
with each relay coil to protect the nEXT pump.
1. Connect the customer control equipment to the control input pins of the customer logic interface mating half.
Refer to Table 11, which identifies the logic interface connector pins. The control inputs are as follows:

Start

Standby speed
To activate either of these control inputs, connect the control input pin to the 0 V control reference.
To start the pump, connect pin 3 (Start / Stop) to pin 2 (0 V Reference). To stop the pump, break the connection
between pin 3 and pin 2. To put the pump into standby, connect both pin 4 (Standby) and pin 3 (Start/Stop) to pin 2
(0 V reference).
Notes: 1
2
Serial enable is also a control input but is not required in a system operating purely under parallel
control. Make sure that there is no connection to serial enable (pin 5).
The RS485/RS232 slide switch must be in the (default) RS232 position to use the standby or fail parallel
interface signals, refer to Section 3.7.1.
2. To monitor analogue output, connect the customer control equipment to the pump analogue output (pin 9) and
to pin 2 of the customer logic interface mating half.
When the pump is shipped, the analogue output is configured to monitor pump rotational speed. To monitor other
parameters, re-configure the nEXT pump using commands over the Serial Interface. Refer to Section 3.7 for further
details.
3. To monitor the normal status output, connect the customer control equipment to the normal status output (pin
15) and to pin 2 of the customer logic interface mating half. The output can be used to control other devices in
the pumping system. The output can drive a low power relay of up to 24 V coil rating (up to 20 mA).
4. To monitor the fail status output, connect the customer control equipment to the fail output (pin 7) and to pin 2
of the customer logic interface mating half. The output can be used to control other devices in the pumping
system. The output can drive a low power relay of up to 24 V coil rating.
3.7
Connection for serial control and monitoring
The serial interface allows the nEXT pump to be controlled and to be interrogated as to its operational status using
a number of serial commands. There is a multi-drop mode that allows for the connection of more than one nEXT pump
to a single serial port on the control system.
3.7.1
Connect the serial interface to the customer control equipment
The serial interface is available in RS485 or RS232 options which can be selected using the slide switch located above
the controller connector, shown in Figure 12. To adjust the slide switch simply remove the plastic connector cover
on the controller and toggle the slide switch using a small tool. Sliding the switch to the right will enable RS232 serial
interface and to the left will enable RS485 serial interface. The controller default setting is RS232 serial interface.
Page 36
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B800-00-880 Issue D
Installation
Figure 12 - Controller status information
1.
2.
3.
4.
Standby speed increase button
RS485/RS232 switch
Controller connector socket
Standby speed reduce button
5. Alarm LED
6. Status LED
7. Normal LED
CAUTION
When connecting the nEXT pump to a PC, remember that the 0 V pin on the RS232 connector may well be
connected to earth through the PC. If this is the case, ensure that the 0 V rail of the 24 - 48 V supply is not also
connected to earth at some other point such as at the power supply. If the 0 V rail of the 24 - 48 V supply will
not be connected to earth at the PC, an opto-isolated interface to the PC should be used.
The nEXT pump can connect directly to the RS485 or RS232 serial input on the control equipment or a PC as shown
in Figure 13 and 14. In this configuration the PC is the serial link master and the nEXT pump is the slave. The distance
over which the serial link will work is dependent on any difference in voltage between the 0 V at the sending and
receiving end. If the 0 V reference at the receiving end is within 0.3 V of the 0 V Control Reference pin on the nEXT
pump control connector then the serial link should be capable of operating at distances up to 6 m. An interface circuit
external to the nEXT pump may be required for longer distances.
The software in the nEXT pump is capable of operating with several pumps connected to a single serial link master.
This is referred to as multi-drop mode. The RS485 option is recommended for multi-drop mode. With the RS232 option
selected, some additional hardware will be required to link several nEXT pump units to a single serial link master. A
concept drawing of one possible arrangement is shown in Figure 15. Conversely when the RS485 option is selected,
connecting several nEXT pumps to a single master becomes a simple wiring exercise as shown in Figure 16.
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Page 37
B800-00-880 Issue D
Installation
Figure 13 - Logic interface connections - RS232 serial control
1. RS232 interface on control equipment
2. 24-48 V d.c. electrical supply
3. Fuse
4. nEXT pump logic interface
Figure 14 - Logic interface connections - RS485 serial control
1. RS485 interface on control equipment
2. 24-48 V d.c. electrical supply
Page 38
3. Fuse
4. nEXT pump logic interface
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B800-00-880 Issue D
Serial Enable
To send a serial message, first activate serial enable. This is achieved by linking the serial enable input signal (pin 5)
to pin 2 of the customer logic interface mating half. Edwards recommends incorporating this link into the serial
communications cable so that the serial enable is only activated when the serial cable is connected. When the cable
is removed, serial enable will become inactive.
Serial Enable acts as an interlock for start commands sent over the Serial Interface. If the pump is running in serial
control mode (having been sent a Serial Start command) and the Serial Enable subsequently becomes inactive, the
pump will trigger a fail condition and will decelerate to rest. To clear this fail condition, re-activate the serial enable
and send a serial stop command.
3.7.3
Serial protocol
The serial interface link is set to 9600 Baud, 8 bits, 1 stop, no parity with no handshaking. The commands are made
up from printable ASCII characters. The maximum message size that can be sent is 80 characters, including start and
end characters.
Note:
All alphabetical characters must be sent in upper case format. Response may contain lower case characters.
Every complete command message sent will receive a response - either a status code or a data return. The nEXT pump
can only deal with one message at a time. It will only accept a new message once the response to the previous
message has been returned.
If the nEXT pump receives characters that are not framed inside start and stop characters, it will ignore them.
Messages with the stop character missing will be discarded with no response when a new start character is received.
If the nEXT pump receives an unrecognisable message between the start and stop characters, it will return an
appropriate error message.
Refer to Section 3.7.6 for more information about operating the nEXT pumps in multi-drop mode.
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Page 39
Installation
3.7.2
B800-00-880 Issue D
Installation
Figure 15 - Conceptual diagram for multi-drop connection using RS232 interface
1. RS232 interface on control equipment
2. Buffer
Page 40
3. nEXT pump
4. OR gate
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B800-00-880 Issue D
Installation
Figure 16 - RS485 multi-drop connection
1. RS485 interface on control equipment
3.7.4
2. nEXT pump logic interface
Message structure
The message structure and command set are the same for RS485 and RS232 options. To communicate a message to
the nEXT pump, the characters must be sent in a specific order. If the message does not conform to the correct
structure it will be ignored and no reply will be sent.
The correct structure to use is as follows:

a valid start character, either a '!' character for a store operation or a '?' character for a query operation,
followed by

a command, which will be an upper case alphabetical character, followed by

an object number, comprising three decimal digits, followed by

for some commands only, a data field, comprising a sequence of characters separated from the object
number by a space, followed by

a terminating carriage return
The message protocol in multi-drop mode is marginally different, refer to Section 3.7.6.
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 41
B800-00-880 Issue D
Installation
3.7.5
Command set
Table 16 shows a summary of the full set of commands available for controlling and monitoring the nEXT pump.
Table 17 shows the abbreviations that are used to define commands in the following sections and Table 18 shows the
error codes that might be returned.
Table 16 - Summary of commands that can be sent to the nEXT pump
Object name
Command
Parameter Factory
range
setting
Data
type
Units
Comments
Node
!S850
?S850
0.99
-
decimal
address
multi-drop address
0 = disable multi-drop address
99 = wildcard
Pump type
?S851
7;
10;
4
-
string
string
string
chars
chars
chars
Pump type
DSP software version number
(D396496XXX for nEXT)
Full speed RPS (1000 for nEXT)
Pump control
!C852
0
1
-
decimal
-
?V852
0.1800;
32-bits
-
decimal
hex
RPS
flags
!S853
?S853
0
1
0
decimal
Vent options
Stop the pump
Start the pump
Measured motor speed
System status word
Hard vent only when < 50% speed
Controlled vent if > 50% speed or
hard vent if < 50% speed
Hard vent if stop or hard vent if fail
and < 50% speed
Hard vent if stop or controlled vent
if fail and > 50% speed or hard vent
if fail and < 50% speed
Hard vent if fail or hard vent if stop
and < 50% speed
Hard vent if fail or controlled vent if
stop and > 50% speed or hard vent if
stop and < 50% speed
Hard vent if stop or fail
Same as option 6
Vent = Permanently enabled (Fan)
2
3
4
5
6
7
8
Timer setting
!S854
?S854
1.30
8
decimal
minutes
Power limit setting
!S855
?S855
50.200
160
decimal
Watts
Normal speed
setting
!S856
?S856
50.100
80
decimal
%
Normal speed as a percentage of full
speed
Standby speed
setting
!S857
?S857
55.100
70
decimal
%
Standby speed as a percentage of
full speed
Temperature
readings
?V859
0.100;
0.100
-
decimal
decimal
°C
°C
Measured motor temperature
Measured controller temperature
Link parameter
readings
?V860
0.500;
0.300;
0.15000
-
decimal 0.1 Volts Measured link voltage
decimal 0.1 Amps Measured link current
decimal 0.1 Watts Measured link power
Factory settings
!S867
1
-
-
-
PIC software
version
?S868
10
-
string
chars
Page 42
Timeout period for both initial ramp
up and if speed drops below 50%
Link power maximum
Reset all configuration options and
parameters to the factory settings
Boot loader software version number
(D374796XXX)
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Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Parameter Factory
range
setting
Data
type
Units
-
decimal
-
Set target speed to full speed
Set target speed to standby speed
0
1
1
decimal
-
Timer = disabled
Timer = enabled
Note that the timer is permanently
enabled on ramp-up.
!S871
?S871
0
1
2
3
0
decimal
-
Analogue output = measured speed
Analogue output = measured power
Analogue output = measured motor
temp.
Analogue output = measured control
temp.
Close vent valve
!C875
1
-
decimal
-
Closes the vent valve for delayed
start and overrides the current vent
option. There is no open vent valve
command but the stop command
(!C852 0) will clear the override.
Service status
?V881
32 bits
-
hex
flags
Service status word
Controller run time
?V882
0..999999;
-
decimal
hours
Hours run by controller
decimal
hours
Hours until controller service due
decimal
hours
Hours run by pump
decimal
hours
Hours until pump service due
decimal
cycles
Cycles run by pump
decimal
cycles
Cycles until pump service due
Object name
Command
Speed control
!C869
0
1
Timer options
!S870
?S870
Analogue signal
options
0..999999
Pump run time
?V883
0..999999;
-
0..999999
Pump cycles
?V884
0..65535;
-
0..65535
Bearing run time
?V885
0..999999;
-
0..999999
Oil cartridge run
time
?V886
0..999999;
-
0..999999
Comments
decimal
hours
Hours run by bearing
decimal
hours
Hours until bearing service due
decimal
hours
Hours run by oil cartridge
decimal
hours
Hours until oil cartridge service due
Table 17 - Command abbreviations
Abbreviation
cr
chars
d
Meaning
carriage return character
characters
decimal ASCII character
Note:
Fields showing multiple d characters are to indicate typical length. All
data fields have a maximum of 5 decimal characters (prefixed by a minus
number for negative numbers).
h
hexadecimal ASCII character
r
Returned error code - refer to Table 16
sp
space character
string
may have several ASCII characters
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Page 43
Installation
Table 16 - Summary of commands that can be sent to the nEXT pump (continued)
B800-00-880 Issue D
Installation
Table 17 - Command abbreviations
Abbreviation
X
Meaning
multi-drop decimal ASCII character
Note:
Fields showing multiple X characters are to indicate maximum length and
not fixed length.
Table 18 - Error codes
Returned error code
Meaning
0
No error
1
Invalid command for object ID
2
Invalid Query/Command
3
Missing parameter
4
Parameter out of range
5
Invalid command in current state - e.g. serial command to start/stop when in
parallel control mode
Page 44
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B800-00-880 Issue D
Installation
Figure 17 - Logic interface connection - mixed parallel and serial operation
1.
2.
3.
4.
5.
6.
Note:
RS232 interface on control equipment
24 V d.c. electrical supply
Fuse
Optional LED indicator - system OK
Optional LED indicator - normal speed
Current limit resistor for LED
7. Optional serial link selector
8. nEXT pump
9. Optional voltmeter
10. Optional serial enable switch
11. Optional standby switch
12. Start switch
The pump controller may be supplied from voltages above 24 V as specified in Table 10, however the
circuitry connected to the normal and fail lines must still respect the maximum external pull up voltage
rating given in Table 10.
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Page 45
B800-00-880 Issue D
Installation
3.7.6
multi-drop operation
Using multi-drop mode, a single computer system can communicate with more than one nEXT pump. Each nEXT pump
must be assigned its own individual address before it can be fitted into a multi-drop system. The command to assign
the multi-drop address is sent in standard nEXT message format (as detailed in Section 4.1.9).
The message protocol in multi-drop mode is marginally different to that described for serial messages in single pump
systems. The main differences in multi-drop message protocol are detailed below:

All multi-drop commands, queries or replies have the first character #.

All commands, queries and replies contain a header containing the address of the node that the message is
to, followed by the address of the node that the message is from.

There is a delimiter character: (colon) which separates the two multi-drop addresses in the header.

The remainder of the message (command, query or reply) follows the same protocol as already described for
single pump systems.

The wild card address 99 is very useful and means ‘any’ node.
After a nEXT pump has been assigned a multi-drop address, it will ignore any messages in the format for single pumps.
An individual nEXT pump will remain silent and ignore all command messages unless the multi-drop address matches
its own address.
3.8
Connection for mixed parallel and serial operation
The pump can be controlled using parallel interface control inputs and at the same time monitor various pump
parameters using the serial interface. Alternatively, the pump can be controlled using commands sent over the serial
interface while at the same time monitor the normal signal and analogue output over the parallel interface. Figure 17
shows a schematic diagram of a system that demonstrates how to do this. This connection is a hybrid of the parallel
and serial connection which are described in detail in Section 3.6 and 3.7 respectively. Many of the options described
in those sections are available in mixed parallel and serial operation but note that whilst serial enable is active to
enable the serial link, the parallel standby and fail signals are not available. The multi-drop connection shown in
Section 3.7. can also be used with mixed parallel and serial operation.
The pump cannot be controlled using both the parallel and serial interfaces simultaneously. For example, if the pump
is started by sending a start command over the serial interface, the pump cannot then be stopped by using the start
/stop switch on the parallel interface. The pump will ignore the state of the start / stop switch on the parallel
interface. To stop the pump, send a serial stop command. Only when the serial stop command has been received by
the pump can any commands sent via the parallel interface be acted on.
Similarly, if the pump is started by using the start switch on the parallel interface, the pump cannot then be stopped
by sending a stop command over the serial interface. The pump will ignore any start or stop commands received over
the serial interface. To stop the pump, use the parallel stop switch. Only when the pump has been stopped using the
parallel interface switch will any start or stop commands be accepted via the serial interface.
3.9
Vent valve selection, connection and control
CAUTION
If the pump is vented when it is at full rotational speed and the rate of pressure rise is too high, the pump could
be damaged and its life may be reduced. We therefore recommend that either the rate of pressure rise is limited
(refer to Figure 7) or that the vent valve is only opened after the nEXT pump speed has fallen to 50% of full
rotational speed.
Page 46
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B800-00-880 Issue D
Do not connect the vent valve to the backing pipeline, this may lead to contamination. Connect the inlet of the vent
valve to the vent gas supply (refer to Section 2.3 for the vent gas specification).
Venting may be accomplished by using one of the following methods described in Section 3.9.1 to 3.9.4.
3.9.1
Manual vent valve
A manual vent valve is supplied with the nEXT pump. It is not possible to accurately control the rate of pressure rise
using the manual vent valve so take care not to open it too quickly. Edwards recommends that the manual vent valve
is opened only after the pump speed has fallen to 50% of full rotational speed.
3.9.2
TAV5 or TAV6 solenoid vent valve
The TAV5 and TAV6 solenoid valves can be purchased as accessories – refer to Section 7.4. The solenoid valves can
be used in the following ways:

Use a TAV5 or TAV6 solenoid valve in place of the manual vent valve on the pump

Use a TAV5 or TAV6 solenoid valve connected to a convenient flange on the vacuum system
If a vent valve is connected to the vacuum system, select a point upstream of the nEXT pump to prevent
backstreaming of oil from the backing pump.
If using the TAV5 vent valve, the pump may only be hard vented when it is at full speed if the vacuum system has a
volume of 5 litres or more. If using the TAV6 vent valve, the pump may only be hard vented when it is at full speed
if the vacuum system has a volume of 10 litres or more.
If the volume of the vacuum system is less than 5 litres (when using a TAV5 vent valve), or if the volume of the vacuum
system is less than 10 litres (when using a TAV6 vent valve), incorporate a suitable vent restrictor and vent the pump
when it is at full speed or else use the controlled venting option. Table 20 gives an indication of the appropriate
orifice size to be fitted to the vent valve for given vacuum system volumes in order that the rate of pressure rise
remains within the limits shown in Figure 7.
Note:
3.9.3
If a vent restrictor is used, the time required to vent the vacuum system may be unacceptably long. The
time may be reduced by using a vent valve without a vent restrictor and waiting until the pump speed has
fallen to 50% of full rotational speed before opening the vent valve.
Vent valve control
The TAV5 or TAV6 solenoid valve can be controlled by the controller electronics. To use this function, fit the
electrical connector supplied with the pump to the lead of the TAV5 or TAV6 solenoid valve. To ensure cable cores
and screen are wired correctly, follow the electrical connection instructions given in the Accessories Manual
(supplied with the TAV valve) and refer to Figure 9. Plug the connector into the socket at the side of the controller
(refer to Figure 12).
The controller is capable of controlling a number of different venting options. These are defined in Table 19.
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Page 47
Installation
To maintain the cleanliness of the vacuum system, Edwards recommends that, whenever the pump is switched off,
the pump (or vacuum system) is vented when the speed of the nEXT pump is between full rotational speed and 50%
of full rotational speed. Over this speed range, the rotor spins fast enough to suppress any backstreaming of
hydrocarbon oil from the backing pump.
B800-00-880 Issue D
Installation
Table 19 - Vent options
Option number
Description of vent function
0
Vent valve opens fully below 50% full rotational speed for either stop command or
fail.
Note:
This is the factory default setting.
1
Controlled venting from 100% to 50% full rotational speed; vent valve opens fully
below 50% for either stop command or fail.
2
Vent valve fully opens immediately if stop command is received; vent valve opens
fully below 50% full rotational speed if fail.
3
Vent valve fully opens immediately if stop command is received; controlled
venting from 100% to 50% full rotational speed if fail then vent valve opens fully
below 50 %.
4
Vent valve fully opens immediately if fail; vent valve opens fully below 50% full
rotational speed if stop.
5
Vent valve fully opens immediately if Fail; controlled venting from 100% to 50% full
rotational speed if Stop command received then vent valve opens fully below 50%.
6.7
Vent valve fully opens immediately for either Stop command or Fail.
When the pump is shipped, the controller is configured with the factory default vent option 0, as detailed in Table 19.
The controller can be configured to one of the other venting options provided commands can be sent via the serial
interface or an Edwards TIC Turbo and Instrument Controller or Turbo Controller.
The controller only energises (‘shuts’) the TAV solenoid valve when it receives a start command. Prior to that, the
valve will be in the ‘open’ vent state. If the vacuum system is a large system, allow the backing pump to reduce the
pressure in the system to an acceptable level before starting the nEXT pump. In this case, send a command via the
serial interface to close the vent valve before sending a start command - this is known as a delayed start.
If the nEXT pump is being controlled with an Edwards TIC Turbo and Instrument Controller or TIC Turbo Controller,
the TAV solenoid valve can be driven from the TIC. Refer to the TIC Instruction Manuals for more information.
3.9.4
Alternative valve connected to the vacuum system
If using another vent valve, ensure that a suitable vent restrictor is fitted to the vacuum system to limit the rate of
pressure rise. Refer to Table 20 for information about vent restrictor sizes. If a suitable vent restrictor is not fitted,
open the vent valve only after the speed of the pump has fallen to 50% of full rotational speed.
Table 20 - Vent restrictor orifice diameter (with atmospheric pressure at the inlet of the vent valve)
Page 48
Vacuum system volume (litres)
Orifice diameter (mm)
< 20
1.0
< 10
0.7
<5
0.5
<2
0.35
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Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Cooling
3.10.1
Introduction
Installation
3.10
CAUTION
Ensure that the pump is adequately cooled to prevent damage to the rotor and bearing.
CAUTION
When using alternative cooling arrangements other than the standard Edwards cooling accessories, please
ensure cooling is NOT solely directed or ducted onto the pump controller.
CAUTION
If the pump will be located inside an enclosure, ensure that there is adequate ventilation so that the ambient
temperature around the pump does not exceed 40 °C.

Natural convection cooling: For some light pumping duties, with an ambient air temperature less than 30 °C,
natural convection cooling may be adequate to cool the nEXT pump.

Forced air cooling: The ambient air temperature when using forced air cooling must be 5 °C to 35 °C. Ensure
that there is an adequate supply of cooling air to the pump.

Water cooling: Use water cooling with an ambient air temperature greater than 35 °C or when using a
bakeout band (CF variants only). When using water cooling, ambient air temperature must be less than 40 °C
and the water temperature must be between 10 °C and 20 °C.

Edwards recommends that, wherever possible, the pump is cooled by forced air cooling or water cooling.
Refer to Table 6 for further performance information.
3.10.2
Forced air cooling
Air cooling accessories are available for nEXT pumps (refer to Section 7.4). Fit the air cooler as described in the
instruction manual supplied with it. If an alternative fan is used for air cooling, ensure that the flow rate is above
100 m3h-1 (60 cfm).
The air cooler can be powered by a customer external power supply, the Edwards TIC Turbo and Instrument
Controller, the TIC Turbo Controller or the nEXT Controller. It cannot be powered by the controller if a TAV solenoid
valve is already connected to the controller. Follow the electrical connection instructions in the air cooler manual
to wire the lead of the air cooler into the controller connector supplied with the pump (refer to Figure 9). Plug the
connector into the socket at the side of the controller (refer to Figure 12).
The customer controller can be configured to drive an air cooler only if commands can be sent via the serial interface
or an Edwards TIC Turbo and Instrument Controller or Turbo Controller.
3.10.3
Water cooling
CAUTION
To prevent condensation inside the pump and controller, turn off the cooling water when the pump is switched
off.
A WCX water cooler accessory is available for the nEXT pumps (refer to Section 7.4). Fit it as described in the
instruction manual supplied with it. The cooling water supply must comply with the specification given in Section 2.5.
Pipes in the water cooling circuit may become blocked if the cooling water contains too much calcium carbonate or
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Page 49
B800-00-880 Issue D
Installation
if it contains particles that are too large. Corrosion of the water cooling circuit may occur if there is too little calcium
carbonate and oxygen in the water. Good quality drinking water is usually suitable. If in doubt, check the quality of
the cooling water supply and, if necessary, provide treatment and filtration.
Connect the cooling water supply to the water cooler on the pump as described below. Either of the two push fit
connectors on the water cooler can be used for the water supply or return connections.
Push nylon hose (approximately 10 mm outer diameter) into the ends of the hose connectors on the water cooler
on the pump. Alternatively, remove the hose connectors from the water cooler and make direct connections to
the 1/8 inch BSP female threaded fittings on the water cooler.
To avoid breaking the cooling water circuit when removing the pump for maintenance, unscrew the two M4 fixing
screws and remove the water cooler from the pump.
CAUTION
Condensation may occur if a water cooling block is used in high humidity environments. Protect the pump and
other equipment by considered design of the installation; refer to Figure 16 for recommendations.
Figure 18 - Maximum relative humidity to avoid condensation with water cooling
Page 50
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Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Operation
WARNING
Do not operate the nEXT pump unless it is connected to the vacuum system. The pump rotor
rotates at very high speeds and the rotating blades might not be visible. If the pump is run
unconnected, the pump rotor can cause injury.
Before operating the pump, it is worthwhile configuring the various controller settings so that they are suitable for
the application.
If the system is designed to operate with parallel control and monitoring, there is no facility to change the majority
of the controller settings once the nEXT pump is installed on the system. The pump is supplied with all settings at
factory default values, as shown in Table 16. If any of the controller settings are to be changed, change them before
installing the nEXT pump on the system.
The nEXT pump can be configured using the customer serial system. Section 4.1 details the commands that will be
needed to configure the controller. Alternatively, use the Edwards TIC Turbo and Instrument Controller or TIC Turbo
Controller. Further information regarding this is detailed in Section 4.2.
Note:
The standby speed may be adjusted using the button on the controller as described in Section 4.1.4.
If the nEXT pump is operated with parallel control and monitoring and the controller settings will not be reconfigured,
go straight to Section 4.3.
4.1
Configuring the nEXT pump using serial commands
Refer to Table 16 for a summary of the full set of serial commands, parameter ranges and factory defaults for each
setting. The following sections describe the settings in more detail.
4.1.1
Power limit setting
Table 21 shows the power limit setting options for the nEXT pumps. The pump is supplied with a default power limit
as shown. If this limit is not suitable for the application, change it to any value between the maximum and minimum
shown.
Table 21 - Power limit setting
Maximum value setting
Minimum value setting
Default power setting
200 W
50 W
160 W
Send the command as follows (where the 'd' characters represent the value in Watts that will be set. For example,
to set the limit to 90 W, type 90).
Command
!
8
S
5
5
sp
d
d
d
cr
sp
r
cr
The reply will be in the following format:
Reply

S
8
5
5
The power limit setting is now stored in memory within the nEXT pump.
To check what power limit is set, send a query as follows:
Command
?
S
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8
5
5
cr
Page 51
Operation
4
B800-00-880 Issue D
Operation
The reply will be in the following format:
Reply
4.1.2
=
S
8
5
5
sp
d
d
d
cr
Powering a fan from the Controller
A fan can be powered from the nEXT controller, provided that the controller is not being used to control a vent valve.
To enable the fan, send the following command:
Command
!
S
8
5
3
sp
8
cr
*
S
8
5
3
sp
r
cr
The reply will be in the following format:
Reply
The permanently enabled fan setting is now stored in memory within the nEXT pump.
When the pump is shipped, it is set up to run a vent valve. Send a query to find out what the setting is as follows:
Command
?
S
8
5
3
cr
The reply will be in the following format:
Reply
=
S
8
5
3
sp
d
cr
If the character 'd' is 8, then the fan is enabled. If it is anything else, configure the controller to run the fan.
4.1.3
Controlled venting options
If the controller is used to automatically control a vent valve, there are a number of venting options available, refer
to Table 19.
To set a vent option, send the following command, (where the character 'd' refers to the option number shown in
Table 19):
Command
!
S
8
5
3
sp
d
cr
*
S
8
5
3
sp
r
cr
The reply will be in the following format:
Reply
The venting option is now stored in memory within the nEXT pump.
To check the venting option that is set, send a query as follows:
Command
?
S
8
5
3
cr
The reply will be in the following format:
Reply
Page 52
=
S
8
5
3
sp
d
cr
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B800-00-880 Issue D
Standby speed setting
The pump can be run at standby speed rather than full rotational speed. The standby speed is a user-configurable
option and can be set to any value between 55% and 100% full rotational speed. When the pump is shipped, it is
configured with a standby speed of 70% full rotational speed.
The standby speed setting can be changed using the STDBY+ and STDBY- push buttons located on the controller
(shown in Figure 12) or by using a serial command. If using the buttons, each button press will adjust the speed
by 10 Hz (1%).
To change the standby speed setting using a serial command, send the following command (where the characters 'd'
represent the value as a percentage of full rotational speed):
Command
!
S
8
5
7
sp
*
S
8
5
7
d
d
d
cr
The reply will be in the following format:
Reply
sp
r
cr
The standby speed is now stored in memory within the nEXT pump.
To check what standby speed is set, send a query as follows:
Command
?
S
8
5
7
cr
The reply will be as follows:
Reply
4.1.5
=
S
8
5
7
sp
d
d
d
cr
Normal speed setting
The normal speed is a user-configurable setting and can be set to any value between 50% and 100% full rotational
speed. When the pump is shipped, it is configured with a normal speed of 80% full rotational speed.
To change the normal speed setting, send the following command (where the characters 'd' represent the value as a
percentage of full rotational speed):
Command
!
S
8
5
6
sp
*
S
8
5
6
d
d
d
cr
The reply will be as follows:
Reply
sp
r
cr
The normal speed is now stored in memory within the nEXT pump.
To check what normal speed is set, send a query as follows:
Command
?
S
8
5
6
cr
The reply will be as follows:
Reply
=
S
8
5
6
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Edwards and the Edwards logo are trademarks of Edwards Limited.
sp
d
d
d
cr
Page 53
Operation
4.1.4
B800-00-880 Issue D
Operation
4.1.6
Timer setting and options
Refer to Section 1.4.3 for a full description of timer functionality.
The timeout period is a user-configurable option and can be set to any value from 1 to 30 minutes. When the pump
is shipped, it is configured with a default timeout period of 8 minutes.
To change the timer setting, send the following command (where the characters 'd' represent the timeout period in
minutes):
Command
!
8
S
5
4
sp
d
d
cr
The reply will be as follows:
Reply
*
8
S
5
4
sp
r
cr
The timer setting is now stored in memory within the nEXT pump.
To check what timeout period is set, send a query as follows:
Command
?
S
8
5
4
4
sp
d
cr
The reply will be as follows:
Reply
=
S
8
5
d
cr
The timer is permanently enabled during ramp-up, however it is optional to have it enabled at other times. When
the pump is shipped, the timer is enabled by default.
To disable the timer, send the following serial command:
Command
!
S
8
7
0
sp
0
cr
Reply
*
S
8
7
0
sp
r
cr
cr
The reply will be as follows:
The state of the timer option is stored in memory within the nEXT pump.
To enable the timer again, send the following serial command:
Command
!
S
8
7
0
sp
1
*
S
8
7
0
sp
r
The reply will be as follows:
Reply
cr
To check whether the timer is enabled or disabled, send the following query:
Command
?
8
S
7
0
cr
The reply will be as follows (where d=0 means disabled and d=1 means enabled):
Reply
Page 54
=
S
8
7
0
sp
d
cr
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Operation
4.1.7
Analogue signal options
The analogue output can be used to monitor one of four different parameters, as detailed in Table 22.
Table 22 - Analogue signal options
Option number
Description of analogue output number
0
Measured pump rotational speed
Note:
This is the factory default setting.
1
Measured system power
2
Measured motor temperature
3
Measured controller temperature
To configure the analogue output, send the following command (where the character ‘d’ denotes the option number
detailed in Table 22):
Command
!
S
8
7
1
sp
d
cr
*
S
8
7
1
sp
d
cr
The reply will be as follows:
Reply
The analogue output signal setting is now stored in memory within the nEXT pump.
To check which analogue output signal setting is enabled, send a query as follows:
Command
?
S
8
7
1
cr
The reply will be as follows:
Reply
4.1.8
=
8
S
7
1
sp
d
cr
Factory settings
The nEXT pump can be re-configured to its original factory settings with one serial command.
To reset the controller to factory settings, send the following command:
Command
!
S
8
6
7
sp
1
cr
*
S
8
6
7
sp
r
cr
The reply will be as follows:
Reply
The factory settings are restored in the memory within the nEXT pump.
4.1.9
Assigning a multi-drop address
When the nEXT pump is shipped, multi-drop mode is disabled by default. Each individual pump must be programmed
with its own multi-drop address via a point-to-point connection before introduction into a multi-drop network.
Send the following command to assign a multi-drop address (where the 'd' characters represent the address):
Command
!
S
8
5
0
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sp
d
d
cr
Page 55
B800-00-880 Issue D
Operation
Note:
The address can be any decimal number from 1 to 98. The address number 0 is used to disable multi-drop
mode. The address number 99 is reserved as a wild card and is used in the query set up detailed later.
The reply will be as follows:
Reply
*
S
8
5
0
sp
r
cr
The multi-drop address is stored within the nEXT pump.
A query can be sent to the pump to find out if it has a multi-drop address. Send the following command:
Reply
?
S
8
5
0
cr
If the reply is as shown below, the pump has multi-drop mode disabled:
Reply
=
8
S
5
0
sp
0
cr
If the pump already has a multi-drop address, there will be no reply. Communicate with the pump in multi-drop
message protocol. Refer to Section 3.7.6 for more information about multi-drop mode and multi-drop message
protocol.
Use the following query (using wild card address 99 which means ‘any’ node) to find out the multi-drop address of
the nEXT pump:
Command
#
9
9
:
9
9
?
S
8
5
0
cr
The reply will be as follows, where dd denotes the multi-drop address of the pump:
Reply
9
#
9
:
9
9
=
S
8
5
0
sp
d
d
cr
Multi-drop mode can be disabled by assigning the pump an address 0. To do this, send the following command (where
dd denotes the multi-drop address of the pump and XX denotes the address of the node that is sending the command):
Command
#
d
d
:
x
x
!
S
8
5
0
sp
0
cr
#
x
x
:
d
d
*
S
8
5
0
sp
0
cr
The reply will be as follows:
Reply
Once multi-drop mode is disabled, the pump will no longer respond to multi-drop commands.
4.2
Configuring the nEXT pump using a TIC
The nEXT pump can be configured using the Edwards TIC Turbo and Instrument Controller or TIC Turbo Controller.
Refer to Section 3.5.3.
It is possible to set the following parameters of the nEXT pump using the TIC:

Power limit setting

Controlled venting options, including running a fan from the Controller

Standby speed setting

Normal speed setting

Timer settings - both enabling/disabling the timer AND setting the timeout period

Electronic braking options

Factory default settings
Page 56
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Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Note:
It is not possible to configure the analogue output options using the TIC. There is also no facility within the
TIC to assign a multi-drop address to the nEXT pump.
There is a further option of connecting the TIC to a PC and using the TIC PC program to configure the nEXT pump.
The TIC PC program allows for the configuration of all settings shown in the list above as well as allowing
configuration of the analogue output options and assignment of a multi-drop address. Refer to the TIC PC program
Instruction Manual for more information.
4.3
Before starting the pump
Irrespective of the system used to control the nEXT pump, work through the following steps before starting the pump.
4.3.1
Close the vent valve

If using a manual vent valve, turn it clockwise to close it.

If using the customer control system to drive a vent valve, make sure that the vent valve is closed.

If driving a TAV solenoid valve from the controller, the TAV valve will automatically shut when the pump is
started.

If using the TIC to operate the vent valve, refer to Section 4.7.
Note:
The backing pump and nEXT pump can be started at the same time. The nEXT pump will not be damaged
and can operate as an effective baffle, however, if the vacuum system is large (100 litres or larger) it will
be more efficient to allow the backing pump to reduce system pressure to 10 mbar before starting the nEXT
pump. In this case it will be necessary to close the vent valve in advance of starting the backing pump.
When using the controller to control a TAV solenoid valve and operating with parallel control and monitoring, the
valve can not be shut in advance of starting the nEXT pump because the facility to send the appropriate serial
command is not available. If the facility to send serial commands is available, a delayed start can be performed, refer
to Section 4.5.1.
4.3.2
Pre-start checks
1. Turn on the appropriate cooling device (fan or cooling water supply).
Note:
If the controller has been configured to drive a fan, the fan will automatically start when power is supplied
to the nEXT pump.
2. Start the backing pump.
3. Switch on the power supply to the pump. Check that the three LEDs on the controller light up for approximately
0.5 seconds and then extinguish.
If the LEDs do not light up as expected, or if the red or yellow LED begins to flash a repeated sequence or if the red
LED is lit, refer to Section 5.5.
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 57
Operation
For information on how to perform these settings, refer to the TIC Turbo and Instrument Controller or TIC Turbo
Controller Instruction Manuals.
B800-00-880 Issue D
Operation
4.4
Operation with parallel control and monitoring
4.4.1
Start the pump
Start the nEXT pump by linking the start/stop control input to the 0 V control reference on the logic interface
connector. The pump will then accelerate to full operating speed.
The green indicator on the controller will illuminate when the pump reaches normal speed. This is 80% of full
rotational speed by default but a different value may have been selected to suit the application.
4.4.2
Running at standby speed
To run the nEXT pump at standby speed, link the standby control input to the 0 V control reference on the logic
interface connector. If the pump is currently below standby speed then it will accelerate until it reaches standby
speed. If it is running faster than standby speed, it will decelerate until standby speed is reached.
To return the pump to full speed, disconnect the standby control input from the 0 V control reference on the logic
interface connector.
4.4.3
Stop the pump
Stop the nEXT pump by disconnecting the start/stop control input from the 0 V control reference on the logic
interface connector. The pump rotor will decelerate to rest.
4.4.4
Parallel monitoring
It is possible to monitor the following parameters:

Analogue output

Normal signal

Fail signal
Refer to Section 3.6 for instructions on how to monitor these signals. The analogue output is described in Table 10.
4.5
Operation with serial control and monitoring
4.5.1
Delayed start
If using a TAV solenoid valve controlled by the controller, it may be desirable to close it before starting the nEXT
pump. This will allow the backing pump to reduce the pressure in the vacuum system.
To close the vent valve, send the following command:
Command
!
C
8
7
5
sp
1
cr
*
C
8
7
5
sp
r
cr
The reply will be in the following format:
Reply
Note:
Page 58
This command overrides the current vent option and closes the vent valve. There is no open vent valve
command but, when a stop command is sent to the pump, the override is cleared.
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Operation
4.5.2
Start the pump
To start the pump, send the following command over the serial communications link:
Command
!
C
8
5
2
sp
1
cr
*
C
8
5
2
sp
1
cr
The reply will be in the following format:
Reply
The pump will then accelerate to full operating speed. The green indicator LED will illuminate when the pump
reaches normal speed. This is 80% of full rotational speed by default but a different value may have been selected
to suit the application.
4.5.3
Standby speed
To run the nEXT pump at standby speed, send the following command over the serial communications link:
Command
!
C
8
6
9
sp
1
cr
*
C
8
6
9
sp
r
cr
The reply will be as follows:
Reply
If the pump is currently below standby speed then it will accelerate until it reaches standby speed. If it is running
faster than standby speed, it will decelerate until standby speed is reached.
To return the pump to full speed, send the following command:
Command
!
C
8
6
9
sp
0
cr
*
C
8
6
9
sp
r
cr
The reply will be as follows:
Reply
4.5.4
Stop the pump
To stop the nEXT pump, send the following command over the serial communications link:
Command
!
C
8
5
2
sp
0
cr
*
C
8
5
2
sp
r
cr
The reply will be in the following format:
Reply
On successful receipt of the stop command, the pump rotor will decelerate to rest.
4.5.5
Temperature readings
The temperatures of both the pump motor and the internal electronics of the nEXT pump can be monitored by
sending the following query:
Command
?
V
8
5
9
cr
The reply will be as follows, where the first number is the motor temperature and the second number the internal
controller temperature, both measured in °C:
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Page 59
B800-00-880 Issue D
Operation
Reply
4.5.6
V
=
8
5
9
sp
d
d
d
;
d
d
d
cr
Link parameter readings
The internal voltage, current and motor power of the nEXT pump can be monitored by sending the following query:
Command
?
V
8
6
0
cr
The reply will be as follows (where the first number refers to voltage (measured in 0.1 Volts – i.e. divide the number
by 10 to get an answer in Volts), the second number refers to current (measured in 0.1 Amps) and the third number
refers to motor power (measured in 0.1 Watts)):
Reply
4.5.7
=
8
V
6
0
sp
d
d
d
;
d
d
d
;
d
d
d
d
d
cr
Measured motor speed
The measured rotational speed of the motor inside the nEXT pump can be monitored by sending the following query:
Command
?
V
8
5
2
cr
The reply will be as follows, where the first returned number refers to motor rotational speed in revolutions per
second (Hz):
Reply
Note:
4.6
=
V
8
5
2
sp
d
d
d
d
;
h
h
h
h
h
h
h
h
cr
The second return number is a 32-bit system status word (set of 8 hexadecimal characters) which is useful
for fault finding. Refer to Section 5.5.9 for advice on decoding the system status word.
Mixed parallel and serial operation
In mixed parallel and serial operation the pump may receive commands from both serial and parallel interfaces. To
understand how these commands control the pump, refer to Figure 19. The pump will power up with ‘None in
Control’. From this state a parallel start signal or a serial start command may be received, resulting in the pump
moving to parallel control mode or serial control mode respectively. Serial start commands will only be received if
the serial enable line is active.
The state of the serial enable line may be switched between active and inactive whilst in mixed parallel and serial
operation. The primary function of the serial enable line is to enable the serial link. It has no direct effect on the
control mode. The pump will receive and respond to serial commands whenever the serial enable line is active, and
conversely will not receive or respond to serial commands when the serial enable line is inactive.
Availability of the parallel standby and fail signals depends on the state of the serial enable line and the position of
the RS485/RS232 switch as described in Table 23.
Page 60
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Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Serial enable
*
RS232
RS485
RS485/RS232 Switch
Active
Inactive
Standby and fail lines are used for RS232 data. Standby and fail lines are used for parallel
Standby control and fail indication.
Parallel standby control and fail indication are Serial communications are disabled.
disabled.
Standby and fail lines are used for RS485 data. Standby and fail lines are in (RS485) high
impedance state.*
Parallel standby control and fail indication are Serial communications are disabled.
disabled.
Pump target speed will switch between run speed and standby speed in response to any data driven onto
the RS485 bus by other devices connected to the bus. Activation of the parallel start line not recommended
with the RS485/232 switch in RS485 position and serial enable Inactive. Deactivation of the serial enable
line is not recommended with the pump running following a start from the parallel start line when the
RS485/232 switch is in the RS485 position.
In parallel control mode, the pump will not accept serial stop commands but will accept all other serial commands.
When serial enable is active, the pump will run at standby speed if it has been commanded to do so by a serial standby
command. When Serial Enable is inactive and the RS485/RS232 switch is in RS232 position, the pump will run at
standby speed when the parallel standby line is active.
In serial control mode, the state of the parallel Start line will be ignored but the serial enable line provides an
interlock function as shown in Figure 19. This interlock function only operates with serial start commands and
therefore only in serial control mode. In serial control mode, the pump cannot be commanded to standby speed by
the standby line, instead a serial standby command must be used.
The parallel normal and analogue output signals provide valid pump status information at all times under mixed
parallel and serial operation. The analogue output voltages are described in Table 10.
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 61
Operation
Table 23 - Serial enable matrix
B800-00-880 Issue D
Operation
Figure 19 - Serial and parallel control flowchart
4.7
Operation with a TIC
For operation with an Edwards Turbo Instrument Controller or TIC Turbo Controller, the nEXT pump can be connected
directly to this type of unit, which will provide the power necessary to drive the nEXT pump. Instructions on the setup
and operation with the TIC or TIC Turbo Controller can be found on CD ROM part number D397-00-879 which is
supplied with the TIC or TIC Turbo Controller.
4.8
Decelerating and venting
Immediately after applying the stop command, whether by the parallel or serial interface or by the TIC, switch off
the backing pump. Then the system may be vented in accordance with the advice given in Section 3.9.
Page 62
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Do not open a manual vent valve until the pump rotational speed has fallen below 50%, otherwise the rate of
pressure rise may be too high, which could damage the pump. In an emergency only, open the vent valve quickly
to decelerate the pump rotor in the shortest possible time.
Note:
If using the controller to control a TAV solenoid valve, there is a 2-second delay between either a stop
command being received or a fault condition being detected and the vent valve opening. This delay allows
time for gauges, valves and other equipment to be switched off before venting occurs.
The green indicator LED on the controller will extinguish as rotational speed drops below normal speed. At very low
speeds, the yellow indicator LED will flash and will extinguish when the pump has stopped.
4.9
Operation at extreme conditions
4.9.1
Operation with high inlet pressure
If the nEXT pump inlet pressure rises, the power supplied to the pump motor will increase to counteract the gas
frictional load. The pump rotational speed will remain constant until the peak power level is reached; beyond this
level, the speed of the pump will start to reduce.
If the pump speed falls to below 50% of full rotational speed, the timer will start if it is enabled. If the speed does
not recover to above 50% speed before the timeout period expires, the pump will shut down and display a fail signal.
If the timer is disabled, the pump will immediately shut down and display a fail signal if the speed drops below 50%
of full rotational speed. Refer to Section 2.7 for the maximum power delivered to the pump and to Table 6, for
maximum allowable inlet pressure.
4.9.2
Operation at high temperatures
Temperature sensors within the pump mechanism and electronics are monitored by an internal system. If the system
detects that any internal temperatures are too high, the power supplied to the pump motor is reduced; the pump
may not therefore be able to maintain full rotational speed if it is too hot.
If the pump speed falls to below 50% of full rotational speed, the timer will start if it is enabled. If the speed does
not recover to above 50% speed before the timeout period expires, the pump will shut down and display a fail signal.
If the timer is disabled, the pump will immediately shut down and display a fail signal if the speed drops below 50%
of full rotational speed. Refer to Section 2.11 for pump operating ranges and Section 3.10 for advice on pump cooling.
4.9.3
Protection against over-speed
Control software within the controller regulates the pump rotational speed and prevents the pump operating above
its normal full rotational speed. In the unlikely event of a failure of this control software, the controller has a builtin safety circuit that checks whether the pump is running at over-speed. If an over-speed condition is detected, the
controller automatically shuts down power to the pump motor and slows it down to rest. The controller will signal a
fail condition if over-speed has been detected.
If the pump appears to be running at over-speed, switch it off and consult Edwards or the supplier.
4.9.4
Electrical supply failure
WARNING
If the power supply fails when the pump is running, the impeller could continue to spin for
approximately 30 minutes. The control circuit may not give any indication that the impeller is still
running.
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Page 63
Operation
CAUTION
B800-00-880 Issue D
Operation
WARNING
If the parallel start control signal on the logic interface connector is set to start, the pump may
automatically restart when the electrical supply is restored after an electrical supply failure.
Ensure that people cannot be injured by the rotating blades of the pump.
If the electrical supply to the nEXT pump fails when the pump is rotating, the motor of the pump is used as a
generator. The regenerated power is used to maintain the output signals on the logic interface (such as the normal
signal and serial communications), to power the three indicator LEDs on the controller and to maintain power at the
controller output (to control the vent valve, if fitted).
As the pump rotational speed decreases, the motor's ability to generate power also decreases until it is no longer
able to maintain power to the logic interface or LEDs. This will occur at speeds below 50% full rotational speed. In
this case, there will be no indication of pump rotational speed, yet the impeller may still be turning.
When the power is reinstated after a power failure, the behaviour of the pump will depend on the control mode at
the time of failure (parallel or serial) and the length of time the pump was without power. Table 24 shows a number
of scenarios.
4.10
Bakeout
WARNING
Do not touch the bakeout band or surrounding surfaces during the bakeout process as they will be
hot.
CAUTION
Pumps with ISO flanges are not suitable for bakeout, only pumps with CF flanges must be used. When baking the
pump to above 70 °C at the inlet flange, the pump must be water cooled to prevent damage to the bearing
lubricant.
If the pump (and the vacuum system) are heated, the degassing process will speed up and the pump will reach
ultimate vacuum in the shortest possible time. Heating the pump will also prevent condensation of vapours inside
the pump.
The Edwards BX bakeout band may be used to heat the pump (refer to Section 7.4). Fit the appropriate band around
the pump, just below the CF inlet flange. When baking the pump or the system, make sure that the temperature of
the inlet flange does not exceed the values specified in Table 2.
When baking the vacuum system, if the temperature of the system exceeds 200 °C, put a radiation shield between
the system and the pump. This radiation shield will reduce the heat radiated onto the pump rotor.
Typically, a bakeout of four hours is long enough to remove water condensation from the pump. However, the
bakeout time will depend on the amount of condensation in the pump and the vacuum system, and the ultimate
pressure desired.
Table 24 - Behaviour of a pump when the power is re-instated after an electrical supply failure
Length of power failure
Control mode
Power is reinstated before pump
rotational speed falls below 50%
Either parallel or serial control mode Regenerative power maintains all
output signals during the power
failure. The pump will ramp to its
designated speed as quickly as
possible after the power has been
restored.
Page 64
Behaviour of pump
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B800-00-880 Issue D
Length of power failure
Control mode
Behaviour of pump
Power is reinstated after pump
rotational speed falls below 50% but
before regenerative power ceases
Either parallel or serial control
mode, timer disabled
Regenerative power maintains all
output signals during the power
failure. As the timer is disabled, the
controller will go into fail condition
as soon as speed falls below 50% and
will display flashing error code 0.
When the power is reinstated, the
pump will not ramp up until the
error is cleared. To clear the error,
send a stop command (either parallel
or serial, depending on the control
mode), then send a start command
to ramp the pump up to the
designated speed.
Either parallel or serial control
mode, timer enabled
Regenerative power maintains all
output signals during the power
failure. If power is reinstated before
the timer period expires, the pump
will ramp up to its designated speed
as quickly as possible. If the timer
period expires, the controller will go
into fail condition and will display
flashing error code 3. As above,
when the power is reinstated, the
pump will not ramp up until the
error is cleared. To clear the error,
send a stop command (either parallel
or serial, depending on the control
mode), then send a start command
to ramp the pump up to the
designated speed
Power is reinstated after pump
Either parallel or serial control mode Regenerative power ceases and fails
rotational speed falls below 50% and
to maintain output signals. When
the regenerative power ceases
power is reinstated, the pump with
parallel control will automatically
restart if the start control on the
logic interface is set to start. The
pump with serial control will require
a new start command to ramp the
pump up to the designated speed.
Any fail signals that were triggered
during the regenerative power
period are lost when the power is
reinstated.
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Page 65
Operation
Table 24 - Behaviour of a pump when the power is re-instated after an electrical supply failure (continued)
B800-00-880 Issue D
This page has been intentionally left blank.
Page 66
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Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Maintenance
WARNING
When removing the pump, ensure personal protective equipment is used to safeguard against
damage from failed components and possible accumulation of hazardous material that may have
been pumped. Check that the pump is vented to atmosphere and at a safe temperature. Be wary
of possible spillages, sharp edges and debris. Removal of the pump inlet screen will always expose
the risk of injury from sharp edges.
WARNING
Allow the pump rotor to stop, then disconnect the logic interface cable from the power supply and
isolate any other power sources before removing the pump from the vacuum system for
maintenance or fault finding procedures.
5.1
Introduction
Instructions for bearing maintenance and surface cleaning for the nEXT turbomolecular vacuum pump are described
in the following sections. The inlet screens, inlet strainer and inlet flange seals are available as spares (refer to
Section 7.3).
5.2
Bearing and oil cartidge maintenance
The oil cartridge and oil-lubricated bearing will need to be replaced when it reaches the end of its service life. This
is typically more than 17,500 hours for the oil cartridge and 35,000 hours for the bearing.
When the oil cartridge and/or bearing need replacing, Edwards recommends either,

Send the pump to an Edwards Service Centre for a bearing and/or oil cartridge replacement

Purchase a oil cartridge or bearing service kit and replace the bearing and/or oil cartridge on-site (refer to
Section 7.2)
5.3
Rotor life
The fatigue life of nEXT Turbomolecular pump rotors is typically 40,000 to 50,000 cycles. As a precautionary measure,
Edwards recommends that pumps are returned for a major service (rotor replacement) after 20,000 cycles of
acceleration to full speed and back to a stop, or after ten years of use, whichever occurs first.
5.4
Clean the external surfaces of the pump
WARNING
Clean the external surfaces of the pump in a well-ventilated location. When using cleaning
solutions and solvents to clean the pump, observe all precautions specified by the manufacturer.
Avoid inhalation of any particulates that may be present in the pump.
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Page 67
Maintenance
5
B800-00-880 Issue D
Maintenance
CAUTION
Do not attempt to clean any parts of the pump other than external surfaces. Do not disassemble the pump or
remove the controller from the pump. Use of solvents may damage internal pump components.
If the nEXT pump is contaminated inside, it may not be possible to achieve the specified ultimate vacuum or pumpdown time may increase. The pump should be returned to an Edwards Service Centre where the pump will be
dismantled and cleaned.
Any organic solvents can be used to clean the external surfaces of the pump. Edwards recommends using non-CFC
solvents, such as isopropanol or ethanol. Use a cleaning solution that is suitable for the contaminants on the pump
surfaces.
For environmental reasons, keep wastage of cleaning solutions and solvents to a minimum.
5.5
Fault finding
CAUTION
Do not remove the controller from the pump as the controller may be damaged.
Refer to Table 25 for the possible causes of faults and the recommended actions to rectify faults.
Table 25 - Fault finding
Symptom
Check
Action
The controller LEDs do not flash for
0.5 seconds when system switched
on
Has the electrical supply failed?
Ensure that the electrical supply is
switched on and the fuses (and
current limiting devices) have not
been tripped.
Is the pump impeller rotating?
LEDs may not flash if pump is
rotating
The pump does not rotate after a
parallel start command is supplied
Check that the electricity supply is
on and whether the fail output is
active
If there is a fail signal, check
whether the red alarm LED is
flashing. If it is, refer to
Section 5.5.1. If power is supplied,
there is no fail signal and the rotor
still does not rotate then there is a
fault with the pump.
The pump does not rotate after a
serial start command is sent
Check whether the pump returns a
reply to the start command
If there is no reply then perform the
checks given under ‘no serial comms’
otherwise perform the checks under
‘the pump does not rotate after a
parallel start command is supplied’
The pump does not respond in multi- Check that the multi-drop is enabled Make sure the pump has a multi-drop
drop mode
address and that commands are sent
using the multi-drop protocol.
Page 68
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Symptom
Check
The green Normal LED does not light Is the inlet pressure too high?
or the pump is not rotating at full
speed or the pump fails whilst
running
Is the pump running too hot?
Does the rotor rotate freely?
Ultimate pressure cannot be reached Is the pressure limited by water
vapour?
Are any of the vacuum gauges
contaminated?
Action
If so reduce the pumping load or
check for a gross leak into the
system.
Increase the cooling to the pump.
Change from air cooling to water
cooling (refer to Section 2 for
maximum inlet pressure and cooling
requirements). Increase cooling
water flow or decrease the water
temperature or do both. Check that
external heat sources (such as
system bakeout heaters) are not
excessive.
If not, the pump bearings may be
damaged. Contact the supplier or
Edwards.
Bake the system and pump.
If so clean or replace them.
Is the pumping speed insufficient
Increase the conductance or reduce
(due to poor conductance between
the volume.
the pump and the gauge or too large
a chamber)?
Is the interstage inlet pressure
> 0.5 mbar (50 Pa)
If the interstage inlet pressure is too
high, inlet pressure at the
turbomolecular inlet is increased;
ensure that the interstage inlet
pressure is < 0.5 mbar (50 Pa).
Is the backing pressure
> 10 mbar (1x103 Pa)
If so, the backing pressure may be
too high. Check for backing pipeline
leaks. If the throughput is high, a
larger backing pump may be
required.
Is the high vacuum area of the
system contaminated?
If so, clean the high vacuum system.
Check the rest of the system for
leaks and contamination.
If found, repair the leaks and clean
the contamination.
Remove the pump from the system
If inlet pressure is poor, check the
and test the ultimate pressure of the pump for contamination and refer to
pump alone (refer to Section 2)
Section 5. Leak test the pump. If the
leak rate > 1x10-7 mbar l s-1
(1x10-5 Pa l s-1) contact the supplier
or Edwards.
The pump is very noisy or there is
excessive vibration or both.
Is the pump rotational speed the
same as the resonant frequency of
the attached system.
If so, change the natural frequency
of the system or isolate the pump
using flexible bellows.
Is the vibration being transmitted
from the rotary backing pump?
If so, fit flexible bellows or a
vibration isolator in the backing line.
Is the noise irregular and getting
progressively worse?
If so, a bearing is defective. Contact
the supplier or Edwards.
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 69
Maintenance
Table 25 - Fault finding (continued)
B800-00-880 Issue D
Maintenance
Table 25 - Fault finding (continued)
Symptom
No serial comms
Check
Action
Is the pump making a constant high
pitched noise?
If so, the rotor is out of balance.
Contact the supplier or Edwards.
Check that the electrical supply is
on, that the serial link is connected
and that the serial enable line is
active
Check slide switch is in the correct
position for RS232 or RS485
communication.
Left for RS485
Right for RS232
Right for parallel control and
monitoring
Check baud rate and, if operating in
multi-drop mode, the node address
matches those of the pump.
Fail signal or standby signal not
working
Check that the red light is not on or
flashing
If LED is on, perform the checks
against the red alarm LED symptoms
Check the serial enable line is
inactive
Must be disconnected or driven high
for use of standby and fail lines
Check slide switch is in the correct
position for the RS232 or RS485
communication.
Left for RS485
Right for RS232
Right for parallel control and
monitoring
Yellow service LED is flashing a
repeated sequence
See flashing service codes in
Section 5.5.1
The red alarm LED is on
Normal during the software upgrade
process.
At other times indicates a problem
has been detected in the FLASH
memory
The red alarm LED is flashing
Note the position of the long flashes Look up the flashing error code in
within the series of 6 flashes to work Section 5.5.8 and follow the advice
out the error code.
given.
Any other problems
Contact the supplier or Edwards
Page 70
If during software upgrade then
complete the upgrade process.
Otherwise cycle power and if this
does not help then perform a
software upgrade.
Contact the supplier or Edwards.
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Flashing service codes
Whenever a service is required the standard once per revolution flash on the yellow status LED is replaced with a
service flash code. The service flash codes are specified in Table 26.
Table 26 - Flashing service codes
Service flash code
Comments
Actions
LED on 1sec
LED off 1sec
Oil cartridge service recommended
It is recommended that the oil
cartridge is replaced. Refer to
Section 7.2.
LED on 3sec
LED off 1sec
Bearing and oil cartridge service
recommended
It is recommended that the bearing
and oil cartridge are replaced. Refer
to Section 7.2.
LED on 3sec
LED off 3sec
Pump service required
The turbo impeller or controller has
reached its expected life. It is
recommended that the pump is
returned to an Edwards service centre
for service. Refer to Section 7.2.
5.5.2
Decoding service status words
The service status may be accessed directly via the serial link. This method of accessing service status will give the
most complete picture of current and future service requirements and will allow preventative maintenance activities
to be scheduled.
A summary of the current pending service status is provided in response to the service status command:
Command
?
V
sp
h
8
8
1
cr
The reply will be as follows:
Reply
=
V
8
8
1
h
h
h
h
h
h
h
cr
The service status word is made up of 8 hexidecimal digits. To decode this word, convert each digit into a 4-digit
binary number as described in Section 5.5.9.
Each binary digit (bit) represents a flag that is either active (state 1) or not active (state 0). To help decode the
service status word, each bit is numbered (starting with 0 for the least significant to 31 for the most significant) as
shown in Section 5.5.3. The meaning of each bit in the service status word is given in Table 27.
Table 27 - Service flags
Bit number
Status flag
Active flag means
0
Oil cartridge service due
Set when hours until oil cartridge service due = 0
1
Bearing service due
Set when hours until bearing service due = 0
2
Pump service due
Set when hours until pump service due = 0
or cycles until pump service due = 0
3
Controller service due
Set when hours until controller service due = 0
4
Reserved
-
5
Reserved
-
6
Reserved
-
© Edwards Limited 2013. All rights reserved.
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Page 71
Maintenance
5.5.1
B800-00-880 Issue D
Maintenance
Table 27 - Service flags (continued)
Bit number
Status flag
Active flag means
7
Service due
Service is due. Specific operation required should be
determined by checking the bits above
8 - 31
Reserved
5.5.3
-
Controller run time
The run hours and recommended service time of the controller on the nEXT pump can be monitored by sending the
following query:
Command
V
?
8
8
1
cr
The reply will be as follows, where the first number is the hours run by the controller and the second is the number
of hours until service is recommended:
Reply
=
V
8
8
2
sp
d
d
d
d
d
d
;
d
d
d
d
d
d
cr
Note that the number of hours until the next service is due is estimated by the controller based on the operating
conditions of the pump and therefore may reduce at more or less that 1 hour per hour. The dominant factor in
extending controller life is reduced pump temperature.
5.5.4
Pump run time
The run hours and recommended service time of the impeller in the nEXT pump can be monitored by sending the
following query:
Command
?
V
8
8
3
cr
The reply will be as follows, where the first number is the hours run by the impeller and the second is the number of
hours until service is recommended:
Reply
5.5.5
=
V
8
8
3
sp
d
d
d
d
d
d
;
d
d
d
d
d
d
cr
Pump cycles
The number of start-stop cycles completed and the number remaining until the next service is due can be monitored
by sending the following query:
Command
?
V
8
8
4
cr
The reply will be as follows, where the first number is the start-stop cycles completed by the pump and the second
is the number of start-stop cycles until service is recommended:
Reply
Page 72
=
V
8
8
4
sp
d
d
d
d
d
d
;
d
d
d
d
d
d
cr
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Bearing run time
The run hours and recommended service time of the bearing in the nEXT pump can be monitored by sending the
following query:
Command
V
?
8
8
5
cr
The reply will be as follows, where the first number is the hours run by the bearing and the second is the number of
hours until service is recommended:
Reply
=
5.5.7
V
8
8
5
sp
d
d
d
d
d
d
;
d
d
d
d
d
d
cr
Oil cartridge run time
The run hours and recommended service time of the oil cartridge in the nEXT pump can be monitored by sending the
following query:
Command
?
V
8
8
6
cr
The reply will be as follows, where the first number is the hours run by the oil cartridge and the second is the number
of hours until service is recommended:
Reply
=
5.5.8
V
8
8
6
sp
d
d
d
d
d
d
;
d
d
d
d
d
d
cr
Flashing error codes
Whenever a fail condition becomes active, the red alarm lights continuously or shows a flashing sequence. If the error
light is on continuously, this indicates a problem with the embedded software. In this case, try cycling the power. If
cycling the power does not clear the indication, a software download will be required. Contact the supplier or
Edwards. If the alarm LED is flashing, identify the error flash code and consult Table 28.
There is a sufficient off period between each subsequent cycle repetition to clearly mark the start of a new flash
sequence. The duration of a long flash (L) is equal to 3 times the duration of a short flash (0.5 s).
Table 28 - Flashing error codes
Error flash
position
Error flash
code
0
Comments
Actions
ssssss
The speed fell below 50% of full
rotational speed with the Timer
disabled.
Check whether the pump is too hot or
whether the inlet pressure is too high.
1
Lsssss
Controller internal software mismatch. Cycle the power to the pump and see
whether the error code appears again.
If it does, contact the supplier or
Edwards.
2
sLssss
Controller failed internal configuration Cycle the power to the pump and see
and calibration operation.
whether the error code appears again.
If it does, contact the supplier or
Edwards.
3
ssLsss
Failure to reach or maintain half full
speed within the timer setting value.
Check whether the pump is too hot or
whether the inlet pressure is too high.
4
sssLss
Overspeed or overcurrent trip
activated, or other hardware fault.
Cycle the power to the pump and see
whether the error code appears again.
If it does, contact the supplier or
Edwards.
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 73
Maintenance
5.5.6
B800-00-880 Issue D
Error flash
position
Error flash
code
5
6
Note:
Comments
Actions
ssssLs
Pump internal measurement system
disconnected or damaged.
Cycle the power to the pump and see
whether the error code appears again.
If it does, contact the supplier or
Edwards.
sssssL
Serial enable becomes inactive
following a serial start command.
Re-activate serial enable and send a
serial stop command to clear the error
code.
The alarm LED error flash sequence is capable of signalling multiple fail conditions. For example, error flash
code sLssLs signifies both error 2 (controller failed internal configuration and calibration operation) and
error 5 (pump internal measurement system disconnected or damaged).
5.5.9
Decoding system status words
If using the serial communications link, additional information, that may be useful for fault finding, can be accessed.
When sending a query to monitor measured motor speed, the pump also returns a system status word.
The send command is as follows:
Command
V
?
8
5
2
cr
The reply will be as follows, where the first returned number refers to motor rotational speed in revolutions per
second (Hz):
Reply
V
=
8
5
2
sp
d
d
d
d
;
h
h
h
h
h
h
h
h
cr
The system status word returned is made up of 8 hexadecimal digits. To decode this word, convert each digit into a
4-digit binary number. (Table 29 is provided as an aid.) Follow the example below:



1 0 0 0
1 0 1 0
0

0
3
0 0 0 0
0

0
8
1 1 0 0
2

2
0 0 0 0
2

2
0 0 0 0

Maintenance
Table 28 - Flashing error codes
1 0 0 0
1
0
Table 29 - Hexadecimal conversion table
Page 74
Hexadecimal
Binary
Decimal
0
0000
0
1
0001
1
2
0010
2
3
0011
3
4
0100
4
5
0101
5
6
0110
6
7
0111
7
8
1000
8
9
1001
9
A
1010
10
B
1011
11
C
1100
12
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Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Hexadecimal
Binary
Decimal
D
1101
13
E
1110
14
F
1111
15
Each binary digit (bit) represents a flag that is either active (state 1) or not active (state 0). To help decode the
system status word, each bit is numbered (starting with 0 for the least significant to 31 for the most significant) as
shown below.
Table 30 contains a list of the lower 16 status flags that will be useful for fault finding. The upper 16 status flags are
reserved by Edwards.
Binary digits
0
0
1
0
0
0
1
0
1
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
                               
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
9
8
7
6
5
4
3
2
1
0
Bit numbers
Table 30 - Status flag
Bit number
Status flag
Active flags means
0
Fail
Fail status condition active
1
Stopped speed
Below stopped speed
2
Normal speed
Above normal speed
3
Vent valve closed
Vent valve energised
4
Start
Start command active
5
Serial enable
Serial enable active
6
Standby
Standby active
7
Half full speed
Above 50% full rotational speed
8
Parallel control mode
Exclusive control mode selection
9
Serial control mode
Exclusive control mode selection
10
Invalid Controller software
Controller internal software mismatch
11
Controller upload incomplete
Controller failed internal configuration and calibration
operation
12
Timer expired
Failure to reach or maintain half full speed within the
timer setting value
13
Hardware trip
Overspeed or Overcurrent trip activated
14
Thermistor error
Pump internal temperature measurement system
disconnected or damaged
15
Serial control mode interlock
Serial enable has become inactive following a serial
Start command.
The system status word used in the example above was obtained with the pump at rest. By decoding the word, we
can learn more about the state of the pump. Refer to Table 31.
© Edwards Limited 2013. All rights reserved.
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Page 75
Maintenance
Table 29 - Hexadecimal conversion table (continued)
B800-00-880 Issue D
Maintenance
Table 31 - Example decoding of system status words
Bit number
Status of bit
(in example)
0
0
5.5.10
We can deduce
The pump has not failed
1
1
The pump is at rest
2
0
Speed is below normal speed
3
0
The vent valve is open
4
0
There is no active start command
5
1
Serial enable is active
6
0
Standby is not active
7
0
Speed is below 50% of full rotational speed
8
0
The pump is not in parallel control mode
9
0
The pump is not serial control mode
10
0
There is no controller internal software mismatch
11
0
Controller passed internal configuration and calibration
operation
12
0
The timer has not timed out
13
0
Overspeed and overcurrent trip not activated
14
0
Pump internal temperature measurement system is fine
15
0
Serial enable has not become inactive during serial control
Useful service information
If using the serial communications link, additional information about the pump, such as pump type and internal
controller software versions, can be accessed. This information is particularly useful for service personnel to
determine the model of the pump.
Send the following query to find out pump type:
Command
S
?
8
5
1
cr
The reply will be as follows, where string 1 is the pump type, string 2 is the DSP software version number and string
3 is the designated full speed of the pump (in revolutions per second):
Reply
=
S
8
5
1
sp
String 1
;
String 2
;
String 3
cr
Send the following query to find out the boot loader software version:
Command
S
?
8
6
8
cr
The reply will be as follows, where string1 is the boot loader software version number:
Reply
Page 76
=
S
8
6
8
sp
String 1
cr
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Storage and disposal
CAUTION
Use of non-Edwards spares may result in reduced reliability and performance and will invalidate your warranty.
6.1
Storage
Use the following procedure to store the pump.
1. Place protective covers over the inlet, outlet, interstage (for the ‘i’ nEXT only), purge, booster (for the ‘T’ nEXT
only) and vent ports.
2. Place the pump in its packing materials. For fastest pump-down when the pump is put back into service, seal the
pump inside a plastic bag together with a suitable desiccant.
3. Store the pump in cool, dry conditions until required for use. Refer to Table 14 for recommended storage
environment. When required, prepare and install the pump as described in Section 3.
4. Keep the pump upright at all times to prevent the drainage of oil from the bearing reservoir.
5. Avoid long-term storage if possible. When long-term storage is necessary, the pump should be set up and run for
at least eight hours every six months.
6.2
Disposal
WARNING
In the unlikely event of a failure of the pump rotor, use appropriate personal protective equipment
when handling and disposing of the pump and ensure that all pump inlets and outlets are capped
off before disposal.
Dispose of the nEXT pump and any components and accessories safely in accordance with all local and national safety
and environmental requirements.
Particular care must be taken with any components that have been contaminated with dangerous process substances.
Take appropriate action to avoid inhalation of any particles that may be present in the pump.
Do not incinerate the pump. The pump contains phenolic and fluorosilicone materials that can decompose to very
dangerous substances when heated to high temperatures.
© Edwards Limited 2013. All rights reserved.
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Page 77
Storage and disposal
6
B800-00-880 Issue D
This page has been intentionally left blank.
Page 78
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Service, spares and accessories
7.1
Introduction
Edwards products, spares and accessories are available from Edwards companies in Belgium, Brazil, China, France,
Germany, Israel, Italy, Japan, Korea, Singapore, United Kingdom, USA, and a world-wide network of distributors.
Order spare parts and accessories from the nearest Edwards company or distributor. When ordering, please state for
each part required:

Model and Item Number of your equipment

Serial number (if any)

Item Number and description of the part
7.2
Service
Edwards products are supported by a worldwide network of Edwards Service Centres. Each Service Centre offers a
wide range of options including: equipment decontamination; service exchange; repair; rebuild and testing to factory
specifications. Equipment that has been serviced, repaired or rebuilt is returned with a full warranty.
Edwards local Service Centres can also provide engineers to support on-site maintenance, service or repair of your
equipment.
For more information about service options, contact the nearest Edwards Service Centre or other Edwards company.
7.2.1
Returning a pump for service
If returning a pump to a Service Centre, use the returns procedure included at the end of this manual. The instruction
in the returns procedure to drain all fluids does not apply to the lubricant in the pump oil reservoirs. Do not return
your pump with the accessories fitted. Remove all accessories and retain them for future use.
Ensure that a completed HS2 form is returned with the pump.
If the pump is configured to suit the application, make a record of the configuration before returning the pump. All
replacement pumps will be supplied with default factory settings. The TIC/nEXT PC monitor program (available as
an accessory) allows for automatic downloading and saving the configuration.
7.2.2
Bearing and oil cartridge on-site maintenance
The oil cartridge and bearing of the nEXT pump can be serviced on-site by any service engineer trained by Edwards.
The following service tool kits and service parts are available,
Table 32 - Service tool kits
Service tool kit
Item number
Oil cartridge tool kit
B800-00-812
Bearing tool kit
B800-00-805
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Page 79
Service, spares and accessories
7
B800-00-880 Issue D
Service, spares and accessories
Table 33 - Service kits
Service kit
Item number
Oil cartridge
B800-00-811
Bearing and oil cartridge
B800-00-810
Note:
Both the oil cartridge and bearing tool kits are required when changing a pump bearing.
7.3
Spares
7.3.1
ISX inlet screen
An inlet screen is fitted to the CF pump as supplied to prevent damage from the entry of debris into the pump. The
Item Numbers of replacement inlet screens are given below. Select the inlet screen according to the pump inlet
flange size. The inlet screen on a pump cannot be replaced with an NW inlet flange.
Table 34 - Inlet screens
Flange Size
Inlet Screen
Item Number
DN100CF
Coarse inlet screen
B800-00-821
DN100CF
Fine inlet screen
B800-00-822
DN160CF
Coarse inlet screen
B800-00-823
DN160CF
Fine inlet screen
B800-00-824
7.3.2
Inlet strainer
The interstage pumps are supplied with an inlet strainer for the interstage port. The Item Number for a replacement
inlet strainer is given below.
Table 35 - Inlet strainers
Flange Size
Inlet Screen
DN25ISO-K
B706-10-817
7.3.3
Inlet-flange seals and integrated inlet screens
nEXT pumps are supplied with an inlet seal. The Item Numbers of replacement seals are given in Table 36.
Table 36 - Inlet flange seals and integrated inlet screens
Flange size
Inlet flange seal
Item number
DN100ISO-K
ISO100 trapped O-ring with integrated coarse inlet screen
B810-00-808
DN100ISO-K
ISO100 trapped O-ring with integrated fine inlet screen
B810-00-809
DN160ISO-K
ISO160 trapped O-ring with integrated coarse inlet screen
B800-00-825
DN160ISO-K
ISO160 trapped O-ring with integrated fine inlet screen
B800-00-826
DN100ISO-K
ISO100 trapped O-ring
C105-23-001
DN160ISO-K
ISO160 trapped O-ring
C105-24-001
DN100CF
100CF copper compression gasket (pack of 5)
C082-00-003
DN160CF
160CF copper compression gasket (pack of 5)
C083-00-003
Page 80
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Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
NW16 and NW25 Ports
nEXT pumps are supplied with NW25 exhaust and booster ports. The item numbers of replacement ports are given
below.
Table 37 - NW16 and NW25 ports
Port
Item Number
NW25
B800-00-809
NW16
B800-00-806
7.4
Accessories
7.4.1
Installation
The accessories available for use with the nEXT pumps are described in the following section. Figure 20 and 21 shows
how the accessories are fitted to the pump.
7.4.2
ACX air cooler
An ACX air cooler can be fitted to the nEXT pump, refer to Section 3.10 to check the suitability of air cooling in a
particular application.
Table 38 - ACX air cooler
Air Cooler
Current draw
Item number
ACX nEXT radial fan
135 mA
B580-53-175
ACX nEXT axial fan
135 mA
B580-53-185
ACX nEXT radial fan (with Phoenix connector)
135 mA
B580-53-170
ACX nEXT axial fan (with Phoenix connector)
135 mA
B580-53-180
7.4.3
WCX water cooler
A water cooler can be fitted to the nEXT pump refer to Section 2.5 to check the suitability of the cooling water
supply.
Table 39 - WCX water cooler
Water Cooler
Item Number
WCX nEXT water cooling kit
B800-00-815
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Page 81
Service, spares and accessories
7.3.4
B800-00-880 Issue D
Service, spares and accessories
7.4.4
BX bakeout band
A BX bakeout band accelerates the degassing of the pump to enable it to achieve lower pressures. It may also
be used to protect the pump from condensation of contaminants. The bakeout bands are available in 110 – 120 V
or 220-240 V versions.
Note:
The bakeout band is only for use with CF variants
Table 40 - BX bakeout band
Bakeout Band
Item Number
For use with
BX250 (110 V)
B580-52-041
nEXT240
BX250 (240 V)
B580-52-061
nEXT240
BX300 (110 V)
B800-00-814
nEXT300
BX300 (240 V)
B800-00-816
nEXT300
BX450 (110 V)
B580-52-043
nEXT400
BX450 (240 V)
B580-52-063
nEXT400
7.4.5
TAV vent valve and vent port adaptor
Two solenoid-operated vent valves are available for system venting. The valves are 24 V d.c., normally-open and can
be driven by the controller. The solenoid valve is fitted in place of the manual valve, or alternatively can be fitted
with an adaptor (supplied with the valve) and can be used with any suitable NW10 flanged port on the vacuum system.
TAV5 is suitable for smaller vacuum systems. TAV6 has a higher conductance and is suitable for larger vacuum systems
(typically with volume greater than 10 litres).
Table 41 - TAV vent valve and vent port adaptor
Product
Orifice Diameter
Item Number
TAV5 vent valve
0.5 mm
B580-66-010
TAV6 vent valve
1.0 mm
B580-66-020
7.4.6
VRX vent restrictor
Use a VRX fixed orifice vent restrictor to restrict flow of vent gas into the pump. A VRX vent restrictor can be fitted
to the inlet of a TAV5 or TAV6 vent valve or to a PRX10 purge restrictor. Refer to Table 20 for information on the
selection of the correct VRX vent restrictor and to Table 42 for the item numbers of the vent restrictors available.
Table 42 - Vent restrictors
Page 82
Vent restrictor
Orifice diameter (mm)
Item number
VRX10
0.1
B580-66-021
VRX20
0.2
B580-66-022
VRX30
0.3
B580-66-023
VRX50
0.5
B580-66-024
VRX70
0.7
B580-66-025
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Vent port adaptor
The vent port adaptor has a 1/8 inch BSP male thread that can be screwed into both the vent port and purge port,
making them suitable for NW10 fittings.
Table 43 - Vent port adaptor
Vent port adaptor
Item Number
Vent port adaptor NW10 -1/8 inch BSP male
B580-66-011
7.4.8
PRX purge restrictor
The PRX10 is a modified DN10NW centring ring that filters the purge gas and restricts its flow rate to the
recommended flow of 25 sccm. A vent port adaptor must be fitted to the purge port in order to connect a purge
restrictor to the pump.
Table 44 - PRX purge restrictor
Item
Item Number
PRX10 purge restrictor
B580-65-001
7.4.9
C-Clamp Adaptor Kit
The NW25 exhaust and booster port of the nEXT pump can be removed and replaced with a C-clamp connection.
The following tool kit and parts are available
Table 45 - C-clamp adaptor tool kit
Tool kit
Item Number
Port removal and insertion tool
B800-00-807
Table 46 - C-clamp adaptor port kit
Port kit
Item Number
C-Clamp and NW25 flange adaptor
B800-00-813
7.4.10
Interface Cable
An interface cable connects the nEXT pump to a PC. Serial commands are then used to control and monitor the nEXT
pump.
Table 47 - Interface cable
Item
Item Number
nEXT Interface Cable
7.4.11
B800-00-808
TIC PC Program
The TIC PC program is a piece of PC-based software that can be used fore retrieving and setting the user configurable
parameters in the pump. It also enables monitoring and data logging of the pumping system.
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 83
Service, spares and accessories
7.4.7
B800-00-880 Issue D
Service, spares and accessories
Figure 20 - nEXT exploded accessories view
1. BX 250 bake out band (DN100CF envelope shown)
2. BX 250 bake out band position
3. WCX water cooling accessory
Page 84
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
B800-00-880 Issue D
Service, spares and accessories
Figure 21 - nEXT exploded accessories view
1.
2.
3.
4.
5.
DN10NW adaptor
VRX vent restrictor
Manual vent valve (fitted)
TAV solenoid vent valve
Purge plug (fitted)
6.
7.
8.
9.
PRX purge restrictor
DN10NW adaptor
ACX nEXT air cooler (radial)
ACX nEXT air cooler (axial)
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 85
B800-00-880 Issue D
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Page 86
© Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
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