UMDPS15N
DPS1-5N
Digital High Voltage Power Supply
This document supersedes all previous specifications. Photek accept no responsibility for
damage incurred if the customer does not follow the procedures outlined in this manual.
Photek Ltd
26 Castleham Road
St Leonards-on-Sea
East Sussex
United Kingdom
TN38 9NS
Telephone
Facsimile
E-mail:
+44 1424 850555
+44 1424 850051
sales@photek.co.uk
Issue 1
24th February 2014
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Contents
1
DPS1-5N DESCRIPTION
4
2
SAFETY:-
4
3
FRONT PANEL DESCRIPTION
5
3.1
Power Switch
5
3.2
Adjust Control
5
3.3
Touch Control Display
5
4
REAR PANEL DESCRIPTION
7
4.1
IEC Mains Inlet
7
4.2
HT Output Connector
7
4.3
GND Terminal
8
4.4
Interlock & Power Output
8
4.5
RS-232 Connector
9
4.6
DC Power Output Fuses
9
4.7
Interlock Inputs
5
HIGH VOLTAGE CONNECTION NOTES:-
11
6
OPERATING INSTRUCTIONS
12
7
RS-232 SERIAL INTERFACE
14
10
7.1 Serial Link Configuration
7.1.1
Configuration Summary:7.1.2
Command Acknowledgement
14
14
14
7.2
15
DPS1 Serial Commands
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7.3 Command & Data Format
7.3.1
Command List Request
7.3.2
Channel and Voltage Setting
7.3.3
Unit Identification
7.3.4
Get Channel
7.3.5
Set Ramp Rate
7.3.6
Set Interlock/s
7.3.7
Verbose
7.3.8
Power Command
16
16
16
16
17
18
18
19
19
8
SPECIFICATIONS
20
9
ITEMS SUPPLIED
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1 DPS1-5N Description
The DPS1 is a. mains powered digital high voltage power supply unit with a universal input
which will operate between 90-260V a.c..
There is one high voltage output which may be used to power a detector fitted with a potential
divider network.
This unit contains one negative power supply module with the following specifications:High Voltage Output
Maximum
-5kV
Output Current Maximum
Full Load Ripple
500uA
800mV
Features of this unit are:• Variable high voltage output with 1V resolution display.
• dv/dt voltage adjustment feature to control changes in the output with ‘ramp up’
function to avoid sudden changes in the output voltage.
• Output Short Circuit and Flash-over protection.
• Two user interlock functions.
• Three fused low voltage power outputs (+12V,+5V,-12V)
The DPS1 does not provide any image acquisition or image processing functions.
2 Safety:The high voltage module contained within the DPS-1 has a maximum current capability as
follows:• V1
(-5kV module)
500uA
The maximum output energy that can be delivered by this module is limited to less than 4 joules
for user safety,
Warning:- If a large capacitive load is connected across the output, the energy stored by
this external capacitor may exceed this limit.
Energy Stored By Capacitor = ½ CV2 joules
In order to avoid any corona discharge: - Under no circumstances should a high voltage output
be run at a voltage higher than 5kV in air without some insulation material encapsulating the
high voltage connection.
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3 Front Panel Description
The front panel of the DPS1 is illustrated below: -
3.1 Power Switch
The mains power On/Off switch for the DPS1 unit.
3.2 Adjust Control
This is a rotary control which is used to adjust the output voltage of the DPS unit. In order for
this control to function the output must be selected by touching the “Set Voltage” area of the
touch screen.
3.3 Touch Control Display
This is a 3.2” touch control display which allows the control functions of the DPS unit to be
accessed manually.
The touch sensitive areas are coloured “dark blue” on the display
The current operating conditions of the DPS1 are displayed here. Manual modification of
functions may be carried out using the touch control interface in conjunction with the Adjust
control.
Any functions downloaded from the PC will be displayed on the unit status display as soon as
they are implemented.
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The Touch Screen Display is illustrated below:-
The display has 3 active touch sensitive areas: 1. Adjust Voltage Selection Switch: This allows the user to manually select the output and
vary the set voltage by use of the Adjust control.
2. High Voltage ON/OFF Switch: This allows the high voltage to be turned on and off.
When the high voltage is turned on the output will ramp up over the programmed ramp
time, this is to ensure that there is no sudden change in voltage on the device connected
to the output.
3. Interlock Function Switch: This allows the user to enable or disable the 2 interlock
functions of the DPS1 unit and also displays the status of the interlocks. Each interlock
can be either “Disabled”, “Enabled” or “Tripped”.When an interlock is Tripped an
audible tone will be emitted from the DPS1 unit and the display will indicate the
unsatisfied interlock.
There are 3 numerical readings displayed: 1. Set Voltage Display: This displays the output voltage that will be enabled on DPS1
when the output is turned on. The voltage displayed here will be adjusted when the
Adjust voltage selection switch has been pressed. The output does not have to be turned
on in order to adjust the set voltage. (Display Resolution = 1V.)
2. Actual Voltage Display: This displays the voltage present on the output of the DPS unit.
If the output is turned off this will display 0V. When the output is turned on the user will
observe the voltage incrementing gradually up to the set voltage.
3. Current Display: The current drawn from the output is displayed here, the current
measurement is in micro Amps (uA) with a maximum resolution of 1uA.
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4 Rear Panel Description
The rear panel of the DPS1 is illustrated below: -
4.1 IEC Mains Inlet
The mains input for this unit is via a fused IEC inlet. This unit accepts any a.c. mains voltage
between 90V and 250V, either 50Hz or 60Hz.
For voltages below 120Vac a 2.5A fuse should be fitted and for voltages in the range 220V or
higher a 1.5A fuse should be fitted. Fuses are 5x20mm (dia. x length).
4.2 HT Output Connector
The HT Output high voltage connector fitted to the DPS1 is an SHV BNC socket rated at 12kV
d.c. The SHV BNC High Voltage connector pin assignment and voltages supplied are as
follows: HT Output
Function
Output Voltage
Center
High Voltage Output
0V to -5000V
Shield
0V
0V
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4.3 GND Terminal
This is an M5 terminal binding post which may be utlised as an easy access 0V/Earth connection
for test and measurement or for system earth bonding.
Under no circumstances should this be used as a 0V power return connection for the high
voltage or the low voltage outputs from this unit. The high voltage return is the screen of the
SHV connector and the low voltage 0V return connections are located in the 15-way D
Connector.
4.4 Interlock & Power Output
This is a 15-Way D-type Socket which provides 3 low voltage power supplies for external
peripheral units and the interlock input connections.
This may be utilised to provide power for units used in conjunction with the DPS1 unit such as
gate units and pre-amplifier modules or interlock interface circuitry.
Each power output is available on 2 pins of the connector as detailed in the table below and there
are multiple 0V connections available to allow for several units to be powered with individual
power and ground connections for each unit.
The output pinouts for this connector are detailed below: -
(View as seen looking at the rear panel)
Pin Number
Output Voltage
Maximum Current
4 to 6 (Inclusive)
12 to15 (Inclusive)
1&9
0V
+12V
1A
2 & 10
+5V
2A
3 & 11
-12V
0.25A
8
Interlock 1 Input
7
Interlock 2 Input
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4.5 RS-232 Connector
This is an asynchronous serial communication port operating at a fixed baud rate of 57600. This
enables the DPS1 to be controlled from a standard PC by means of ASCII control characters and
codes.
The DPS1 RS-232 uses a 2 wire system (transmit and receive), handshaking is implemented in
software for confirmation of valid control codes.
A full listing of codes and protocols are listed in the software interface section of this manual.
The RS-232 connector is a 9-Way D-Type Plug. Pin-out functions are listed below: -
(View as seen looking at the rear panel)
9 Way D-type plug
Pin No.
Function
Pin 2
Transmit data
Pin 3
Receive data
Pin 5
Ground/ 0V
The DPS1 is supplied with a USB to RS232 converter lead Photek part number ED375. The
driver software for this can be found on the CD supplied with the system.
4.6 DC Power Output Fuses
These are the three 5x20mm internal fuses for the low voltage power outputs. The output voltage
and fuse rating of each output is indicated above the fuse holder and is detailed in the Table in
the “Interlock and Power Output” section of this manual.
The combined current utilised by peripheral units must not exceed the rated output of the power
supply voltage rail being utilised.
If the rated power output is exceeded the internal functions of the DPS unit may be
compromised, under no circumstances should fuses higher than the rated value be fitted into this
unit.
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4.7 Interlock Inputs
The DPS1 has 2 interlock inputs which may be used together or individually. When used
together the interlocks observe a logical OR function to disable the high voltage output i.e. if
either interlock is enabled and not satisfied the high voltage output will be turned off.
Each interlock is enabled individually by successive presses of the “Interlocks” area of the touch
screen. The interlock setting will cycle through the sequence: Interlocks Disabled, Interlock 1
Enabled, Interlock 2 Enabled, Both Interlock 1 and 2 Enabled and back to Interlocks Disabled
again.
When an interlock is enabled and not satisfied the DPS unit will disable the high voltage output
and emit an audible tone until either all interlocks are satisfied or the unsatisfied interlock is
disabled. This audible tone will be emitted even if the high voltage is not enabled.
Each interlock input is an active low input which requires a 0V connection to satisfy the internal
logic and allow the high voltage to be enabled. An internal pull-up resistor ensures that if the
interlock is enabled but the interlock input is open circuit, the interlock will be unsatisfied and
the high voltage will be disabled, an audible tone will be emitted to indicate an unsatisfied
interlock.
The ‘Interlock and Power Output’ 15-way D connector socket is the interlock interface input for
the DPS unit. Please Refer to section 4.4 for pinout information.
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5 High Voltage Connection Notes:All High Voltage connections must be made before applying power to this unit.
The connector supplied with this unit is an 12kV rated high voltage SHV BNC connector. Care
should be taken to ensure that correct connections have been made before power is applied to
this unit.
For Photek supplied systems all high voltage connectors will be supplied with the system.
Any user terminated connections must be carried out with adequate precautions to ensure safety
of both user and equipment
The following precautions should be observed for connections made by the user: 1. All wires must have an adequate voltage rating for the high voltage that they will
carry.
2. All wires utilised in a vacuum chamber must be suitable for this application.
3. All wires should be continuous and connected to the SHV BNC plug at one end and
the Channel plate detector or appropriately rated connector at the other end. These
wires should not be ‘wired inline’, i.e. joined.
4. Mechanical strength of connections should be ensured with adequate strain relief to
ensure reliable operation and extended life of the connections.
5. Connections should be insulated with suitable insulation material, such as heatshrinkable insulation tubing or a suitable silicon compound may be used to
encapsulate the connections.
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6 Operating Instructions
1. The DPS1 high voltage output must be connected to the device before application of power
to this unit.
2. On power up the HT module will be “OFF”. The required voltage may be set before
powering on the HT module. Press the adjust voltage selector switch area to enable the
“Adjust” control. When the voltage may be edited the voltage display box will turn yellow as
illustrated: -
3. Set the voltage required on the output using the “Adjust” control. At this point the output is
still off.
4. Press the “ Output ON/OFF ” area and the output will start ramping up. When the power is
on the ‘Actual Voltage’ display text turns red and the “Output ON/OFF” area turns red as
illustrated below: -
Note : - During the “Ramping Up” phase the text in the Voltage Selector switch area will
turn Red, this indicates that the output is not at its setpoint. When the output reaches its
setpoint the text changes back to white.
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5. The output may be adjusted dynamically while it is on by pressing the adjust voltage selector
switch area to enable the “Adjust” control. When the output is “ON” the current drawn from
the ouput will be displayed in the current display area of the display.
6. Interlocks may be enabled or disabled at any time by pressing the Interlock Function switch.
If an interlock is enabled and unsatisfied the interlock display area will turn red and the text
for the unsatisfied interlock will changed to “Tripped”. An audible tone will be emitted from
the DPS unit to alert the user to an interlock problem.
The first press of any switch area on the DPS display or a press of the adjust control will
accept the interlock and cancel the audible alarm. However the High Voltage will not be
allowed to turn “ON” until either the interlock is satisfied or disabled.
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7 RS-232 Serial Interface
7.1 Serial Link Configuration
The RS-232 utilised by the DPS1 is a 3-wire interface for asynchronous transmission and
reception of data. The interface utilises TD (Transmit Data), RD (Receive Data) and Gnd from
the RS-232 protocol.
The Baud rate for communication is fixed at 57600; this is programmed into the DPS1 and
cannot be modified.
The Data format is No Parity, 8 Data bits and 1 stop bit.
All data transmitted to or from the DPS1 is in ASCII format. Commands take the form of letters
and variables are ASCII numbers.
7.1.1 Configuration Summary:Baud Rate
Parity
Data Bits
Stop Bits
=
=
=
=
57600
No
8
1
7.1.2 Command Acknowledgement
When a serial command is received it may be acknowledged or the acknowledgement can be
supressed if the user wishes by enabling the “vb” or “verbose” command.
To suppress command acknowledgement send a “vb1” or “vb0” command and the DPS1 will
accept commands but not acknowledge them. To re-enable command acknowledgement send a
“vb2” command.
The following is a list of command acknowledgements and error codes that may be received by
the user.
Response
ok
err 1 command not recognised
err 2 parameter missing
err 301 number out of range
Description Of Response
command accepted and executed
characters entered are not a valid command
valid parameter required
command not accepted as the value is out of the range of the
function being updated
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7.2 DPS1 Serial Commands
The commands for the DPS1 have been enabled in 2 ways, short commands for quick control by
the user typing the commands and also as long commands (words) that may be used in software
code to make it more readable/understandable. DPS1 user commands are listed below: Short
Long
Command
Command
Description
cmds
commands
Command Table Request
sc
setchannel
Channel Selection and Voltage Setting
id
version
Unit Name & Software Version Request
sr
setramp
High Voltage Ramp-Up rate Setting
p
power
High Voltage Power Off, On
gc
getchannel
Channel Selection and Voltage Reading
si
setinterlock
Interlock Setting
vb
verbose
Response Selection
Note: - Commands are not case sensitive.
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7.3 Command & Data Format
7.3.1 Command List Request
The command list request command allows the user to see a list of all user commands
available for the DPS1. The format of this command function is illustrated below: Command
Function
ASCII
Command
Letter
ASCII Integer
Data String
Command List
Request
cmds
-
Notes
(commands)
7.3.2 Channel and Voltage Setting
The setchannel command character/s must be followed by 2 ASCII variables, the first is the
channel number, for a DPS1 this will always be 1, the second variable is the actual voltage
required, for negative power supplies a “-” sign is required for the output voltage to be
accepted. The format of this command function is illustrated below: Command
Function
ASCII
Command
Letter
ASCII Integer
Data String
Notes
Channel Select
and Voltage
Setting
sc
1,-1000
Channel 1 Output
set to -1000V
(setchannel)
7.3.3 Unit Identification
The unit identification may be requested from the DPS1 by using the ‘id’ command. The
returned data will be the unit type ‘DPS1’ and the firmware issue number i.e. ‘V1.00’. each
data element will be de-limited by a comma, an ok will follow the returned data string. The
format of this command function is illustrated below: Command
Function
ASCII
Command
Letter
ASCII Integer
Data String
Returned Data
Request Unit
Identification
id
-
DPS1,v1.00,ok
(version)
(no data string)
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7.3.4 Get Channel
The getchannel command enables the user to request the operating conditions of the DPS1
unit. The getchannel command character/s must be followed by 2 ASCII variables, the first is
the channel number, for a DPS1 this will always be 1, the second ASCII variable is the
number indicating the variable that is to be requested There are 10 variables that may be
requested, these are listed below: 1. Measured Voltage Value.
2. Set Voltage Value.
3. Measured Current Value.
4. Absolute Voltage Limit – High
5. Absolute Voltage Limit – Low
6. Relative Voltage Limit – High
7. Relative Voltage Limit – Low
8. Interlock Enable/Disable Status
9. Interlock Input Actual Status
10. Ramp Speed.
Data is returned in floating point notation, OK is returned on receipt of a valid command.
The format of this command function is illustrated below: Command
Function
ASCII
Command
Letter
Valid ASCII
Integer Data
Data Requested
Get Channel Data
gc
1,1
Measured Voltage
(getchannel)
1,2
Set Voltage
1,3
Measured Current
For the interlock status request functions the data returned indicates the following: Data Returned
Interlock Enable/Disable
Interlock Input Actual Status
Status
0
Both Interlocks Disabled
Both Interlocks Satisfied
1
Interlock 1 Enabled
Interlock 1 Unsatisfied
2
Interlock 2 Enabled
Interlock 2 Unsatisfied
3
Both Interlocks Enabled
Both Interlocks Unsatisfied
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7.3.5 Set Ramp Rate
The speed that the high voltage rises from 0V to its set value is controlled by the “SetRamp”
command. This is a command followed by an ASCII number variable which is equivalent to
seconds equal or greater than 1. (i.e. minimum ramp rate = 1 second)
The format of this command function is illustrated below: Command
Function
ASCII
Command
Letter
ASCII Integer
Data String
Equivalent Ramp
Speed
Set Ramp Rate
sr
10
10 seconds
(setramp)
3600
1 hour
7.3.6 Set Interlock/s
The set interlocks command allows the required interlocks to be enabled/disabled. The
setinterlock command character/s must be followed by one ASCII variable, this is the setting
required for the interlocks. The interlocks are function variable is illustrated by the following
table: Data Sent
Interlock Enable/Disable
Status
0
Both Interlocks Disabled
1
Interlock 1 Enabled
2
Interlock 2 Enabled
3
Both Interlocks Enabled
The format of this command function is illustrated below: Command
Function
ASCII
Command
Letter
ASCII Integer
Data String
Notes
Set interlocks
Si
0
Both interlocks
Disabled
1
Interlock 1 Enabled
2
Interlock 2 Enabled
3
Both interlocks
Enabled
(setinterlock)
Set interlocks
Si
(setinterlock)
Set interlocks
Si
(setinterlock)
Set interlocks
Si
(setinterlock)
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7.3.7 Verbose
The verbose command allows the user to specify the level of command acknowledgement
required from the DPS1 unit. The “vb” command is followed by either a 0, 1 or 2.
0 indicates no repsonses required, 1 enables just error responses, 2 enables all responses.
The default state for verbose is all acknowledgements are enabled.
The format of this command function is illustrated below: Command
Function
ASCII
Command
Letter
ASCII Integer
Data String
Notes
Set Command
Acknowledgement
vb
0
No
Acknoledgements
1
Only Errors are
Acknowledged
2
Enables all
acknowledgements
(verbose)
7.3.8 Power Command
The power command provides an on/off function for the High Voltage PSU.
The format of this command function is illustrated below: Command
Function
ASCII
Command
Letter
Maximum/
Minimum
ASCII Integer
Data String
Command
String
Transmitted
Instruction
Equivalence
High
Voltage
Power
On/Off
p
1
p1
HV Power On
(power)
0
p0
HV Power Off
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8 Specifications
Mechanical:
DPS1 Size:
depth 290mm (Maximum Extents)
width 155mm
height 100mm
DPS1 Weight:
≈2.2Kg
Panel Colour:
Umbra Grey (RAL7022)
Case Colour:
Pebble Grey
(RAL7032)
Bezel Colour:
Stone Grey
(RAL7030)
Electrical:
Supply Voltage :
Universal 90-260V 50/60Hz
FuseRating Required:
100V/110V/120V
2.5Amp
220V/230V/240V
1.5Amp
HT Output Voltage
0V to –5kV
HT Output Current Maximum
500uA
Maximum Ripple on Full Load
800mV
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9 Items Supplied
The following Items are deliverable with the DPS1-5N system:Item
No.
Description
Quantity
1
DPS1-5N Power Supply
1
2
ED573 - 2m SHV to SHV BNC
Cable
1
3
ED375 - 2m USB to RS232 Lead –
USB A to 9-Way D type Socket
1
4
2m IEC Mains Lead with a moulded
plug (US, UK or European Plug)
1
5
DPS1 CD - USB Driver and Manual
1
6
DPS1-5N User Manual
1
© Photek Ltd. February 2014
Any unauthorised adjustment or modification to this unit will void all warrantees and will only be supported
at Photeks discretion.
Photek reserves the right to ammend general information contained in this manual without prior notice.
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