- Physik Instrumente
PZ221E User Manual
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T
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E-618 High-Power Piezo Amplifier / Controller
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Release: 1.0.0 Date: 23 June 2010
This document describes the following
product(s):
T
T
■
E-618.10
High-Power Piezo Amplifier Module, 1 Channel,
-30 to 130 V, 20 A
T
■
T
■
■
E-618.10G
High-Power Piezo Amplifier, 1 Channel,
-30 to 130 V, 20 A, 9.5” Chassis
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E-618.1G
High-Power Piezo Controller, 1 Channel, -30 to 130 V,
20 A, Controller & Interface/Display Upgrade possible,
19'' Chassis
T
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E-618.20G
High-Power Piezo Amplifier, 2 Channels, -30 to 130 V,
20 A, 19” Chassis
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© Physik Instrumente (PI) GmbH & Co. KG
Auf der Römerstr. 1 ⋅ 76228 Karlsruhe, Germany
Tel. +49 721 4846-0 ⋅ Fax: +49 721 4846-299
[email protected] ⋅ www.pi.ws
Physik Instrumente (PI) GmbH & Co. KG is the owner of the following company names and trademarks:
PI®, PIC®, PICMA®, PILine®, PIFOC®, PiezoWalk®, NEXACT®, NEXLINE®, NanoCube®,
NanoAutomation®
The following designations are protected company names or registered trademarks of third parties:
LabVIEW
The products described in this document are in part protected by the following patents:
US Patent No. 6,950,050
Copyright 2010 by Physik Instrumente (PI) GmbH & Co. KG, Karlsruhe, Germany.
The text, photographs and drawings in this manual enjoy copyright protection. With regard thereto, Physik
Instrumente (PI) GmbH & Co. KG reserves all rights. Use of said text, photographs and drawings is
permitted only in part and only upon citation of the source.
First printing 23 June 2010
Document Number PZ221E BRo, Release 1.0.0
E-618_User_PZ221E100.doc
Subject to change without notice. This manual is superseded by any new release. The newest release is
available for download at www.pi.ws (http://www.pi.ws).
About this Document
Users of this Manual
This manual is designed to help the reader to install and operate the E-618 High-Power Piezo
Amplifier/Controller. It assumes that the reader has a fundamental understanding of motion control
concepts and applicable safety procedures.
The manual describes the physical specifications and dimensions of the E-618 High-Power Piezo
Amplifier/Controller as well as the procedures which are required to put the system into operation.
Conventions
The notes and symbols used in this manual have the following meanings:
WARNING
Calls attention to a procedure, practice or condition which, if not
correctly performed or adhered to, could result in injury or death.
DANGER
Indicates the presence of high voltage (> 50 V). Calls attention to a
procedure, practice or condition which, if not correctly performed or
adhered to, could result in injury or death.
CAUTION
Calls attention to a procedure, practice, or condition which, if not
correctly performed or adhered to, could result in damage to equipment.
NOTE
Provides additional information or application hints.
The optional components which might be mentioned in this document are described in their own manuals.
All documents are available as PDF files. Updated releases are available for download at www.pi.ws
(http://www.pi.ws) or via e-mail: contact your Physik Instrumente Sales Engineer or write [email protected]
(mailto:[email protected]).
Related Documents
E-509_User_PZ77E
E-517_User_PZ214E
E-515_User_PZ68E
!
Contents
1
Introduction
1.1
1.2
1.3
1.4
1.5
1.6
2
Overview ............................................................................................. 3
Prescribed Use.................................................................................... 4
Safety Precautions .............................................................................. 5
Model Survey and Upgrades............................................................... 7
Additional Components ....................................................................... 8
Unpacking ........................................................................................... 9
Operation
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
10
Calibrated System............................................................................. 10
Installation ......................................................................................... 10
15-Pin Main Connector on E-618.10 Modules .................................. 12
Front Panel Elements........................................................................ 13
Line Voltage Connection ................................................................... 14
Piezo Actuator Connection................................................................ 15
Temperature Sensor Connection ...................................................... 16
Control Signal Connection ................................................................ 17
2.8.1
2.8.2
2.9
3
Analog Operation................................................................................ 17
Remote Control via Computer Interface............................................. 17
Modes of Operation........................................................................... 18
2.9.1
2.9.2
Open-Loop Operation......................................................................... 18
Closed-Loop Operation ...................................................................... 18
2.10 First Steps ......................................................................................... 18
2.11 Zero-Point Adjustment in Closed-Loop Operation with E-509 .......... 20
2.12 Protection Against Overheating ........................................................ 21
3
Maintenance
3.1
3.2
4
5
AC Power and Line Power Fuses ..................................................... 22
Cleaning ............................................................................................ 23
Troubleshooting
4.1
4.2
4.3
22
24
Mechanics Does not Move................................................................ 24
The TEMP OFL LED Lights .............................................................. 24
Customer Service.............................................................................. 24
Technical Data
25
5.1
5.2
5.3
5.4
6
Specifications .................................................................................... 25
Frequency Response Diagram ......................................................... 26
Block Diagram................................................................................... 27
Signal Path with Servo-Controller and PC-Interface Modules .......... 28
Appendix
6.1
6.2
29
Lifetime of PICMA® Actuators .......................................................... 29
Power Bandwidth .............................................................................. 31
Introduction
1
Introduction
1.1
Overview
The E-618.10 high-power amplifier module is specifically designed for
ultra-high-dynamics operation of piezo actuators. It can output and sink a
peak current of 20 A and an average current of 800 mA in a voltage range of
-30 to 130 V. Besides the amplifier module, three standard configurations are
available:
■
E-618.10G is a bench-top amplifier in a 9.5" chassis, for open-loop
operation (1 channel)
■
E-618.1G is the amplifier module in a 19" rackmount chassis that can
hold additional E-509 controller and E-517 interface / display modules
■
E-618.20G is a 2-channel version in a 19" rackmount chassis
Fast Switching
The amplifier features a high bandwidth of more than 15 kHz combined with
extremely short rise times in the microsecond range and a high output power.
This makes it ideal for fast switching applications for valves, pumps, for
microstructure and material testing. Furthermore, it is perfectly suited for
systems for active vibration control.
Piezo Overtemperature Protection
To protect the mechanics especially in high-dynamics applications, the
E-618 features a temperature sensor input and controller circuit that shuts
down the amplifier if the piezo actuator exceeds the maximum temperature
threshold.
Analog and Digital Control
All E-618 amplifiers come with a high bandwidth analog interface. An
optional 24-bit computer interface for integration in E-618.1G models is
available as E-517.
Ceramic-Insulated Piezo Actuators Provide Superior Lifetime
The highest possible reliability is assured by employing PICMA® multilayer
piezo actuators. PICMA® actuators have a ceramic-only insulation which
makes them resistant to ambient humidity and leakage-current failures. They
are thus far superior to conventional actuators in reliability and lifetime.
Note: Spezial Connector Required
The high electrical currents require adequate connectors and cabling.
Therefore, standard piezo systems and actuators have to be adapted.
www.pi.ws
E-618 PZ221E Release 1.0.0
Page 3
Introduction
1.2
Prescribed Use
Based on their design and realization, E-618 High-Power Piezo Amplifiers
are intended to drive capacitive loads, in the present case, piezoceramic
actuators with high-current termination electrodes. E-618s must not be used
for applications other than stated in this manual, especially not for driving
ohmic (resistive) or inductive loads.
Observe the safety precautions given in this User Manual.
The E-618 may only be used for applications suitable according to the device
specifications. Operation other than instructed in this User Manual may affect
the safeguards provided.
The verification of the technical specifications by the manufacturer does not
imply the validation of complete applications. In fact the operator is
responsible for the process validation and the appropriate releases.
The E-618 is a laboratory apparatus as defined by DIN EN 61010. It meets
the following minimum specifications for safe operation:
■
Indoor use only
■
Altitude up to 2000 m
■
Temperature range 5°C to 40°C
■
Max. relative humidity 80% for temperatures up to 31°C, decreasing
linearly to 50% relative humidity at 40°C
■
Line voltage fluctuations not greater than ±10% of the line voltage
■
Transient overvoltages as typical for public power supply
Note: The nominal level of the transient overvoltage is the standing
surge voltage according to the overvoltage category II (IEC
60364-4-443).
■
Degree of pollution: 2
These data are no limitations for the specifications in the technical data table
(p. 25).
www.pi.ws
E-618 PZ221E Release 1.0.0
Page 4
Introduction
1.3
Safety Precautions
Install and operate the E-618 High-Power Piezo Amplifier only when you
have read the operating instruction.
Keep the instruction readily available close to the device in a safe place.
When the instruction is lost or has become unusable, ask the manufacturer
for a new copy.
Add all information given by the manufacturer to the instruction, e.g.
supplements or Technical Notes.
WARNING
The E-618 amplifier is capable of generating high output voltages and
high output currents. It may cause serious or even lethal injury if used
improperly.
Working with high-voltage amplifiers requires adequately trained
operating personnel. Strictly observe the following:
■
Do not touch the pins of the LEMO connector which carries the
piezo output voltage. The high voltage output may be active
whenever the device is turned on. The output value depends on the
control input. Voltages between -30 V and +130 V can be present
on the LEMO connector.
■
The E-618 amplifier does not contain any user-serviceable parts.
Never disassemble the device. Hazardous voltage can be present
on the internal components.
DANGER
All work done with and on the E-618.10 amplifier module requires
adequate knowledge and training in handling high voltages and high
currents.
Allow operation of the E-618.10 amplifier module only if installed
properly:
www.pi.ws
■
Install E-618.10 in a shielded, EMC-compatible enclosure.
■
Provide suitable line filter and fuses for the line voltage connection
and install them in the enclosure.
E-618 PZ221E Release 1.0.0
Page 5
Introduction
■
Connect pin 32 of the 15-pin main connector on the rear of the
E-618.10 amplifier module to a protective earth conductor.
WARNING
Connect the AC power cord of the E-618 to the wall socket (220 VAC to
240 VAC or 100 VAC to 120 VAC). New line-power fuses are required
when changing the supply voltage. Both fuses are active and have to be
replaced or checked if there is a fault. See "AC Power and Line Fuses"
(p. 22) for how to replace the line power fuses.
Connect an E-618.10 amplifier module to the wall socket only if installed
properly.
To disconnect the system from the supply voltage completely, remove
the power plug from the wall socket.
Install the system near the AC outlet and such that the AC power plug
can be reached easily.
CAUTION
Do not cover the ventilation slots on the top side of the E-618. Place the
system in a location with adequate ventilation to prevent internal heat
build-up. The device needs to be installed horizontally with 3 cm air
circulation area. Vertical mounting prevents internal convection.
Insufficient air flow will cause overheating and premature failure.
!
When installing the E-618.10 amplifier module, make sure that the
enclosure is equipped with suitable ventilation slots for free air
circulation and internal convection.
CAUTION
Use only PICMA® piezo actuators with high-current termination
electrodes. Standard piezo systems and actuators have to be adapted
before they can be used with the E-618. Contact your PI sales engineer
or write [email protected]
For dynamic applications, or continuous operation, the use of a
temperature sensor (PT1000) on the piezo actuator is recommended, to
avoid destruction of the piezo due to heat generation. See p. 16 for
details.
www.pi.ws
E-618 PZ221E Release 1.0.0
Page 6
!
Introduction
1.4
Model Survey and Upgrades
The E-618 series of amplifiers/controllers is based on the following module:
E-618.10
High-Power Piezo Amplifier Module, 1 Channel,
-30 to 130 V, 20 A
The E-618.10 module can be ordered separately and is furthermore
available integrated in the following standard configurations:
E-618.10G
High-Power Piezo Amplifier, 1 Channel,
-30 to 130 V, 20 A, 9.5” Chassis
E-618.1G
High-Power Piezo Controller, 1 Channel, -30 to 130 V,
20 A, 19'' Chassis.
Upgradable with a servo-control module (E-509), and/or a
computer interface and display module (E-517, E-515 for
display only). All modules ordered come installed directly
in the 19” chassis. If the servo module and a piezo
actuator are ordered with the system, your E-618.1G will
be fully calibrated before being shipped.
E-618.20G
High-Power Piezo Amplifier, 2 Channels, -30 to 130 V,
20 A, 19” Chassis
Contact your PI sales engineer or write [email protected], if you want to upgrade
your E-618.1G. Any additional modules are described in their own separate
manuals.
The following modules are available:
www.pi.ws
E-509.C1A,
E-509.L1,
E-509.S1
Sensor / Servo-Controller Module for capacitive, LVDT or
SGS position sensors respectively, 1 channel
to eliminate drift and hysteresis from positioning
operations.
E-517.i1
Interface / Display Module, 24 bit D/A, TCP/IP, USB,
RS-232, IEEE 488, Single Channel;
displays the current voltage and, if servo-module also
present, the position of the PZT, communicates with a
host PC for remote control of the E-618. DLL, LabVIEW
drivers and convenient interactive user interface software
are provided.
E-515.01
Display Module for PZT Voltage and Position, 1 channel
E-618 PZ221E Release 1.0.0
Page 7
Introduction
1.5
Additional Components
Contact your PI sales engineer or write [email protected], if you need one of the
additional components listed below.
Extension cables for the piezo stages:
E-618.X11
Piezo cable, 1 m, Lemo 2-pin/open end for soldering
piezo actuators
E-618.X01
Extension cable, Lemo 2-pin m/f, 1 m
E-618.X03
Extension cable, Lemo 2-pin m/f, 3 m
The E-618 can be controlled via a signal connected to its analog input line
(see "Analog Operation", p. 17, for more information). This signal can, for
example, be generated using a D/A board in a PC. PI offers a LabVIEW
driver set which can be used with certain D/A boards. It is compatible with the
PI General Command Set (GCS) LabVIEW driver set available for all newer
controllers from PI. For order numbers see below:
www.pi.ws
E-500.ACD
CD with LabVIEW analog driver set, available free of
charge upon request.
The PI LabVIEW drivers support all D/A converter boards
from National Instruments that are compatible with
DAQmx8.3. LabVIEW compatibility is given from version
7.1 upwards.
E-500.HCD
Access to HyperBit Functionality for Enhanced System
Resolution (Supports Certain D/A Boards). PI’s patented
HyperBit technology for providing position resolution
higher than that of the D/A board is included in the
E-500.ACD driver set. Activating HyperBit requires
purchase of the password, which can be obtained from PI
under Order No. E-500.HCD.
E-618 PZ221E Release 1.0.0
Page 8
Introduction
1.6
Unpacking
Unpack the E-618 with care. Compare the contents against the items
covered by the contract and against the packing list.
The following components are included with all E-618 models:
PZ221E
User manual for E-618 (this document)
000016103
Dummy plug for the temperature sensor socket, must be
used when the piezo actuator connected to the E-618 does
not feature a temperature sensor
E500T0011
Technical Note for LabVIEW Analog Driver Set
E-618.10 amplifier modules in addition come with:
824005964
Backplane connector type H, 15-pole, female contacts, with
straight 4.0-mm solder pins, type Harting 0906.. (F127.200);
matches the 15-pin main connector of E-618; for installation
completely inside the user housing
E-618.10G, .1G and .20G models in addition come with:
3763
Line cord
Inspect the contents for signs of damage. If parts are missing or you notice
signs of damage, contact PI immediately.
Save all packing materials in case the product needs be shipped again.
www.pi.ws
E-618 PZ221E Release 1.0.0
Page 9
Operation
2
Operation
2.1
Calibrated System
If an E-618.1G with an included servo module is ordered together with a
piezo actuator, the system will be fully calibrated at PI according to your
specifications before being shipped, and will come with a calibration
information sheet.
Calibration should only be done by qualified authorized personnel after
consultation with PI, otherwise internal configuration data may be destroyed
by erroneous operation.
If you inform PI about your application, your E-618.1G will be fully calibrated
before being shipped. It is usually not necessary for you to do anything more
than adjust the zero point before operating the system.
Do not interchange controller (whole devices or individual modules) and/or
piezo stages if they are matched and calibrated together. Respect the
assignment of the piezo actuators to the individual controller channels, as
indicated by the serial numbers on the labels affixed to the devices. With
multi-axis stages respect the channel/axis assignments indicated by the
cable labeling
2.2
Installation
DANGER
All work done with and on the E-618.10 amplifier module requires
adequate knowledge and training in handling high voltages and high
currents.
Allow operation of the E-618.10 amplifier module only if installed
properly:
www.pi.ws
■
Install E-618.10 in a shielded, EMC-compatible enclosure.
■
Provide suitable line filter and fuses for the line voltage connection
and install them in the enclosure.
■
Connect pin 32 of the 15-pin main connector on the rear of the
E-618.10 amplifier module to a protective earth conductor.
E-618 PZ221E Release 1.0.0
Page 10
Operation
!
CAUTION
Do not cover the ventilation slots on the top side of the E-618. Place the
system in a location with adequate ventilation to prevent internal heat
build-up. The device needs to be installed horizontally with 3 cm air
circulation area. Vertical mounting prevents internal convection.
Insufficient air flow will cause overheating and premature failure.
When installing the E-618.10 amplifier module, make sure that the
enclosure is equipped with suitable ventilation slots for free air
circulation and internal convection.
For installing an E-618.10 amplifier module proceed as follows:
1
Provide a suitable enclosure with connections for the signals on the
rear 15-pin main connector of the E-618 module. See section 2.3 for
pinout of the 15-pin main connector and section 2.5 for line voltage
connection details.
For connection inside the enclosure, you can use the included
backplane connector or other suitable female multipoint connectors.
See the note below for details and recommendations.
2
Insert the module into the enclosure. Make sure that its 15-pin main
connector is fitted in the backplane connector.
3
Fix the module to the enclosure using the four included cross-head
screws on the front panel corners.
NOTE
Details regarding the included backplane connector (PI order No.
824005964): type H, 15-pole, female contacts, with straight 4.0-mm
solder pins, Harting 0906.. (F127.200)
Other recommended female connectors according to EN 60603 (DIN
41612) H 15F:
Manufacturer: Schroff, order numbers (Schroff):
69001-981 solder pins, length 4 mm, 0.8 mm x 0.8 mm; straight
69001-980 solder pins, length 10 mm, 0.8 mm x 0.8 mm; straight
69001-733 FASTON connector 6.3 mm x 0.8 mm; straight
www.pi.ws
E-618 PZ221E Release 1.0.0
Page 11
Operation
2.3
15-Pin Main Connector on E-618.10 Modules
Connector type: 15-pin male connector type H with protective earthing
contact (z32), according to EN 60 603 (DIN 41 612)
Pin
Function
4
GND (power)
6
+15 V, 0.3 A (e.g. for a display electronics)
8
-15 V, 0.3 A (e.g. for a display electronics)
10
+5 V, 1.0 A (e.g. for a display electronics)
12
GND (measurement)
14
Control output (CONTROL INPUT + DC-OFFSET)
16
Monitor of piezo output voltage (1% of “PZT” output)
18
Control input to amplifier stage
20
Sync (-) (return conductor)
22
24
Sync (+) input (TTL, 200 Hz, 50% duty cycle
recommended)
Line voltage, neutral conductor
26
n.c.
28
Line voltage, if set for 100 to 120 VAC
30
Line voltage, if set for 220 to 240 VAC
32
Protective earth
NOTES
The line voltage connection is to be done as follows:
220 VAC to 240 VAC: Use pins 24, 30 and 32.
100 VAC to 120 VAC: Use pins 24, 28 and 32.
Never connect both pins 28 and 30 at the same time!
Pins 14 and 18 must be interconnected.
Pins 20 and 22 can be used to synchronize the E-618.10 using an
external TTL signal.
If you use an E-517 interface and display module, you have to connect it
to E-618.10 via pins 4, 6, 8, 10, 12, 14, 16, 18, 20 and 22.
If you use an E-509 servo-control module, you have to connect it to
E-618.10 via pins 4, 6, 8, 12, 14 and 18. Pins 20 and 22 only have to be
connected with E-509 models for capacitive sensors.
www.pi.ws
E-618 PZ221E Release 1.0.0
Page 12
Operation
2.4
Front Panel Elements
Name
Function
DC-OFFSET
10-turn potentiometer for DC offset
POWER LED
(green)
Green light indicates that the device is powered on.
TEMP OFL LED
(red)
Red light indicates that the temperature on the connected
temperature sensor exceeds 150 °C. The output voltage for the
piezo actuator is then deactivated (p. 16).
TEMP SENSOR
Lemo socket for connection of a PT1000 temperature sensor
(p. 16). When the piezo actuator connected to the E-618 does
not feature a temperature sensor, the included dummy plug
must be used.
CONTROL
INPUT
BNC connector for control input voltage.
-2 to 12 V is the recommended control input range, resulting in
-20 to 120 V piezo output voltage (without DC-offset
potentiometer usage).
-3 to 13 V control input are possible and will result in -30 to
130 V output voltage (without DC-offset potentiometer usage),
but working with increased output voltage will decrease
actuator lifetime. See “Lifetime of PICMA® Actuators” on p. 29
for details.
PZT
Lemo socket for piezo stage, carries the output voltage for the
piezo actuator (-30 to 130 V) in the stage; with security cover
E-618.1G models may be equipped with optional servo-control (E-509) and
PC interface/display (E-517, E-515) modules. The controls of these modules
are described in their own separate manuals.
www.pi.ws
E-618 PZ221E Release 1.0.0
Page 13
Operation
2.5
Line Voltage Connection
Models with Chassis:
Unless you request otherwise, upon delivery the E-618 will be set up for the
voltage predominant in your country, either
110 V ~ / 50-60 Hz
or
230 V ~ / 50-60 Hz
To adapt the E-618 to a different line voltage, the line power fuses must be
replaced. See “AC Power and Line Power Fuses” (p. 22) for instructions and
for the required fuse types.
Connect the included line cord from the E-618 rear panel to an appropriate
power outlet.
E-618.10 Amplifier Modules:
DANGER
All work done with and on the E-618.10 amplifier module requires
adequate knowledge and training in handling high voltages and high
currents.
Connect an E-618.10 amplifier module to the wall socket only if installed
properly:
■
Install E-618.10 in a shielded, EMC-compatible enclosure.
■
Provide suitable line filter and fuses for the line voltage connection
and install them in the enclosure.
■
Connect pin 32 of the 15-pin main connector on the rear of the
E-618.10 amplifier module to a protective earth conductor.
The line voltage connection is to be done via the following pins of the 15-pin
main connector (pinout on p. 12):
220 VAC to 240 VAC: Use pins 24, 30 and 32.
100 VAC to 120 VAC: Use pins 24, 28 and 32.
Never connect both pins 28 and 30 at the same time!
We recommend the following line filter:
PE0SXDS6B, Corcom
For the fuses to be used with the line filter see p. 22 for an orientation.
Depending on the design of your system, it may be necessary to use other
line filters and fuses.
www.pi.ws
E-618 PZ221E Release 1.0.0
Page 14
Operation
2.6
Piezo Actuator Connection
!
CAUTION
Use only PICMA® piezo actuators with high-current termination
electrodes. Standard piezo systems and actuators have to be adapted
before they can be used with the E-618. Contact your PI sales engineer
or write [email protected]
For dynamic applications or continuous operation, the use of a
temperature sensor (PT1000) on the piezo actuator is recommended, to
avoid destruction of the piezo due to heat generation. See p. 15 for
details.
Connect the piezo system or actuator to the E-618 via the “PZT” Lemo
socket on the front panel.
DANGER
E-618 amplifiers output high voltages and high currents which can
cause death or injury!
Take special care if connecting products from other manufacturers.
Follow general accident prevention rules!
Modifications of high voltage connectors must be carried out by
adequately trained and educated personnel.
If your PICMA® piezo actuator with high-current termination electrodes is not
equipped with a connector, you have to attach a suitable connector
according to the type and pinout of the “PZT” socket shown below. A
connecting cable with open end for soldering piezo actuators can be ordered
separately, order No. E-618.X11.
“PZT” socket on E-618:
Type: LEMO
EGG.1B.302.CLL with 2 conductors
and a shield
Pin Assignments:
PZT Out: Piezo output, -30 to 130 V
PGND:
Power ground
Housing: Cable shield, for
protective ground
www.pi.ws
E-618 PZ221E Release 1.0.0
Page 15
Operation
2.7
Temperature Sensor Connection
E-618 amplifier modules are equipped with a temperature monitoring circuit
to avoid overheating of the connected mechanics. It can be used with
PT1000 temperature sensors.
Connect the PT1000 to the “TEMP SENSOR” Lemo socket on the front panel
of the E-618. When the mechanics connected to the E-618 does not feature
a temperature sensor, the included dummy plug (order No. 000016103) must
be used.
When a temperature of 150 °C is detected on the mechanics, the E-618
temperature monitoring circuit deactivates the output of the amplifier (“PZT”
socket), and the red “TEMP OFL” LED on the front panel lights up. See p. 21
for how to proceed in this case.
To avoid overheating, you can reduce the maximum operating frequency and
output voltage. The maximum operating frequency and output voltage
(travel) depend on operating conditions such as thermal coupling (single- or
double-ended, with or without air cooling) length-to-diameter ratio and, of
course, on the driving waveform.
The maximum possible frequency for a particular system should be
determined after the system is set up with the defined operating conditions
by slowly running the system up to the point where the controller performs a
thermal shutdown. It is important to take proper account of the temperature
sensor time constant, the mechanical characteristics of the system, and the
amplifier parameters.
Figure 1: Temperature sensor connector of the
E-618.10, view from solder side
Figure 2: Temperature sensor
diagram
Pin assignment:
Pin 1:
Temp_SA
Pin 2:
Temp_S
Pin 3:
GND/PE
Housing: Shield/GND/PE
www.pi.ws
E-618 PZ221E Release 1.0.0
Page 16
Operation
2.8
Control Signal Connection
2.8.1
Analog Operation
All E-618 versions can be operated by an analog control signal. The output
voltage (if in open-loop operation) or the actuator position (closed-loop
operation) is directly proportional to this analog control signal. The analog
control signal consists of two components:
Analog control signal = CONTROL INPUT + DC OFFSET
where
CONTROL INPUT is the voltage connected to the corresponding BNC
socket on the front panel
DC OFFSET is the DC offset voltage set via the corresponding potentiometer
on the front panel (0 to 10 V)
-2 to 12 V is the recommended range for the analog control signal, resulting
in -20 to 120 V piezo output voltage. A range of -3 to 13 V is possible and will
result in -30 to 130 V output voltage, but working with increased output
voltage will decrease actuator lifetime. See “Lifetime of PICMA® Actuators”
on p. 29 for details.
The signal applied to the CONTROL INPUT BNC socket can be generated
using a DAC-board in a PC. PI offers a LabVIEW driver set which can be
used with certain D/A boards. This driver set is compatible with the PI
General Command Set (GCS) LabVIEW driver set available for all newer
controllers from PI. In addition, PI’s patented HyperBit technology for
providing position resolution higher than that of the D/A board is included in
the E-500.ACD driver set (see "Model Survey and Upgrades" p. 7).
2.8.2
Remote Control via Computer Interface
E-618.1G models equipped with an E-517 computer interface and display
module can be controlled from a host computer via the TCP/IP, USB, RS-232
or IEEE 488 PC interface. See the E-517 User Manual for details.
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Operation
2.9
Modes of Operation
2.9.1
Open-Loop Operation
All E-618 versions can be operated in open-loop mode. Open-loop operation
means that any control input provided by the user determines the output
voltage directly.
2.9.2
Closed-Loop Operation
Closed-loop operation requires a position sensor and a servo-control
module, e.g. E-509. Only E-618.1G models can be upgraded with E-509
modules.
Closed-loop operation means that the user commands the piezo excursion.
The output voltage required to reach this target position is calculated
internally by the servo-loop, based on the given target and the feedback of
the position sensors (see E-509 User Manual PZ77E).
Note: In closed-loop operation up to 10% of the amplifier output range may
be required for compensating nonlinearity and drift.
2.10 First Steps
The following instructions refer to analog operation (p. 17) of the system. If
your E-618 is equipped with an E-517 computer interface and display module
and you want to control the system via the computer interface, perform only
steps 1 and 2 of the instructions below and then operate the system as
described in the E-517 User Manual.
1
Make sure the E-618 is connected to line voltage but powered down.
See "Line Voltage Connection" (p. 14) for details.
2
Connect the piezo actuator to the “PZT” socket of the E-618.
3
If the piezo actuator is equipped with a PT1000 temperature sensor,
connect this sensor to the “TEMP SENSOR” socket of the E-618.
Otherwise connect the included dummy plug (order No. 000016103)
to this socket.
4
For closed-loop systems only (E-618.1G with E-509 module; see
also the E-509 User Manual):
4.1
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Connect the sensor cable to the corresponding socket.
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Operation
4.2
If you are using the sensor monitor signal, connect your
appropriate electronics to the SENSOR MONITOR socket.
4.3
Set "SERVO" toggle switch on the servo module "OFF".
5
Turn the DC-OFFSET potentiometer fully counterclockwise (CCW).
6
Make sure that the voltage at "CONTROL INPUT" is set to 0 V.
7
Turn on the E-618. The green "POWER" LED will light up.
8
Command the first motion of the piezo actuator by turning the offset
potentiometer fully clockwise (CW) to run the actuator over the
nominal travel range, then turn the potentiometer back fully CCW.
If an E-517 interface and display module is installed, watch the
voltage and, if an E-509 servo module is present, the position on the
display to check whether the system is operating properly.
Make sure that the full voltage swing is attained
If an E-509 servo module is installed, the SENSOR MONITOR
signal will show a voltage from about 0 up to 10 V and then 0 V
again, proportional to the piezo extension.
Example: A piezo actuator with a nominal travel of 100 µm shows a
sensor monitor signal of 1.5 V at 15 µm. For an actuator with 30 µm
nominal travel, 1.5 V at sensor monitor would correspond to 4.5 µm
(15% of 30 µm)
9
If desired, connect a signal source to the "CONTROL INPUT" BNC
socket. You can adjust the resulting analog control signal with the
DC-OFFSET potentiometer. See “Control Signal Connection”
(p. 17) for details.
E-618.1G models equipped with E-509 servo-control modules:
If you switch to closed-loop operation (servo ON), the yellow “OFL” overflow
LED on the E-509 module may light up. In this case, a zero-point adjustment
is necessary. Follow the instructions for zero-point adjustment given below.
To avoid an overflow of the amplifier in open-loop operation, do not exceed
the allowable control input range (-3 to +13 V).
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Operation
2.11 Zero-Point Adjustment in Closed-Loop
Operation with E-509
Zero-point adjustment on the E-509 sensor and servo-control module has
the following goals:
■
Making the full travel range available: If the electrical zero point is
adjusted properly, the full output voltage range of the amplifier can be
used in closed-loop operation. This prevents overflow conditions from
occurring.
■
Preserving the piezo actuators in the mechanics: The point of zero
sensor readout should correspond to zero or a (small) negative output
voltage. This technique can reduce the average applied voltage
without loss of displacement and thereby increase piezo lifetime.
There might be some small deviation of the electrical zero-point caused by
thermal drift or changes in mechanical loading. Let the system warm up for
several minutes before setting the zero point. See also the E-509 User
Manual, PZ77E.
If an E-517 interface and display module is present in the system, zero-point
adjustment can be performed without additional equipment; see the E-517
user manual for further information. Otherwise a precision voltmeter is
required for zero-point adjustment.
How to perform zero-point adjustment in analog open-loop operation:
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1
Make sure the piezo actuator is mounted in the same way and with
the same load as during normal operation in the application.
2
Make sure that the analog signal on CONTROL INPUT is 0 V and
turn the DC-OFFSET potentiometer fully CCW.
3
Connect a precision voltmeter to the SENSOR MONITOR socket on
the E-509 front panel.
4
Power up the system.
5
Set the SERVO toggle switch on the E-509 front panel to OFF. If an
E-517 interface and display module is present in the system, make
sure that servo is not set on with the SVO command.
6
Turn the DC-OFFSET potentiometer fully clockwise (10 V) and then
back fully counterclockwise (0 V) to exercise the mechanics.
7
Adjust the ZERO potentiometer on the E-509 until a sensor-monitor
signal of +1 V is measured by the precision voltmeter on the
SENSOR MONITOR socket.
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Operation
After successful zero-point adjustment, the “OFL” overflow LED on the E-509
module should no longer glow in closed-loop operation. Permanent glow of
this LED in spite of zero-point adjustment may indicate hardware failure. To
avoid an overflow of the amplifier in open-loop operation, do not exceed the
allowable control input range (-3 to +13 V).
2.12 Protection Against Overheating
To protect the system against overheating, the piezo voltage output on the
“PZT” socket is deactivated automatically in the following cases:
■
A PT1000 temperature sensor connected to the E-618 detects a
temperature of 150 °C on the mechanics. In this case, the red “TEMP
OFL” LED on the front panel lights up.
■
The internal temperature sensor of the E-618 detects a temperature of
85 °C at the electronics. In this case, the red “TEMP OFL” LED on the
front panel does not light up.
If the piezo voltage output has been deactivated, the piezo actuator will no
longer move. Proceed as follows:
1. Turn off the E-618 for a cooling phase.
2. Wait until the temperature has dropped on the mechanics and/or
inside the electronics.
3. Power up the E-618 again.
Permanent deactivation of the piezo output voltage due to overheating may
indicate hardware failure.
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Maintenance
3
Maintenance
WARNING
Before changing the AC fuses or cleaning the E-618, switch the device
off and disconnect it from the line voltage.
3.1
AC Power and Line Power Fuses
Unless otherwise requested, the unit will be set up for the power predominant
in your country. New line-power fuses are required when changing the
supply voltage.
CAUTION
!
Both fuses are active and have to be checked if there is a fault.
Figure 4: Fuse carrier
Figure 3: Position of the line fuses and fuse
carrier, only one of two fuses
visible
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Maintenance
To access the line fuses, proceed as follows:
1
Switch off the E-618 and remove the line cord.
2
Wait a minute to be sure that any residual voltage has dissipated.
3
Pry open the door that covers the fuse carrier and pry out the fuse
carrier (see figures above).
4
Be sure to replace both fuses with fuses of the type appropriate for
the new voltage:
Single-channel systems: E-618.10G, E-618.1G, custom models
with one E-618.10 module:
220 VAC to 240 VAC: 2 x IEC T2AH 250 V (slow blow)
100 VAC to 120 VAC: 2 x IEC T4AH 250 V (slow blow)
Two-channel systems: E-618.20G, custom models with two
E-618.10 modules:
220 VAC to 240 VAC: 2 x IEC T4AH 250 V (slow blow)
100 VAC to 120 VAC: 2 x IEC T8AH 250 V (slow blow)
IEC fuses are cited: other fuse standards may require higher
nominal current rating.
3.2
5
Rotate the fuse carrier so that the valid voltage setting (115 V or
230 V) will show through the window when the door is closed.
6
Reinstall the carrier and close the door.
Cleaning
The outside surface of the chassis can be cleaned using mild detergents or
disinfectant solutions. Organic solvents must not be used.
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Troubleshooting
4
Troubleshooting
4.1
Mechanics Does not Move
4.2
■
Check the connecting cables.
■
Check the analog control signal (CONTROL INPUT and DC-OFFSET
setting). See p. 17 for more information.
■
The piezo voltage output (PZT socket) may be deactivated due
overheating of mechanics and/or electronics. See p. 21 for more
information.
The TEMP OFL LED Lights
■
4.3
The connected temperature sensor is reporting 150 °C and the piezo
voltage output has thus been shut off. Turn off the E-618. Wait until the
temperature at the mechanics has dropped before powering the E-618
up again.
Customer Service
Still having problems? Call your local distributor or write to [email protected];
please have the following information about your system ready:
www.pi.ws
■
Product codes and serial numbers of all products in the system
■
Current firmware version of the controller
■
Software version of drivers and / or host software
■
Operating system on host PC
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Technical Data
5
Technical Data
5.1
Specifications
E-618.10
Function
Power amplifier module for PICMA® multilayer piezo
actuators
Amplifier
Input voltage
-2 to +12 V
Output voltage*
-30 to 130 V
Peak output power
> 3200 W (< 0.3 ms)
Average output power
100 W (> 0.3 ms)
Peak current
> 20 A (< 0.3 ms)
Average current
0.8 A (> 0.3 ms)
Current limitation
Short-circuit-proof
Voltage gain
10 ±0.1
Ripple, noise, 0 to 100 kHz
200mVpp/ 24mVrms (no load),
2mVrms (1µF)
Input impedance
100 kΩ
Interfaces and operation
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Piezo connector
LEMO EGG.1B.302.CLL, with security cover
Control input
BNC
Temperature sensor (piezo
actuator)
PT 1000;
LEMO socket; deactivation of the piezo voltage output at
150 °C actuator temperature
Display
Power, Temp Overflow LEDs
DC Offset
10-turn pot., adds 0 to +10 V to Control In
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Technical Data
Miscellaneous
Operating temperature range
+5°C to +50°C (output 10% derated over 40 °C)
Dimensions
215 x 123 x 185 mm
insert for 42HP/3U 19" rackmount chassis
Mass
2.65 kg
Operating voltage
100 to 120 or 220 to 240 VAC, selectable
Max. power consumption
15 VA (no load)
160 VA (max. load)
*Deactivation of the piezo voltage output at 85 °C internal temperature (overtemp
protection for electronics) or if 150 °C are measured by the temperature sensor at
the piezo actuator.
5.2
Frequency Response Diagram
Figure 5: E-618.10 operating limits with various piezo loads (open-loop),
capacitance is measured in µF
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Technical Data
5.3
Block Diagram
Figure 6: E-618.10 block diagram
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Technical Data
5.4
Signal Path with Servo-Controller and
PC-Interface Modules
The block diagram below shows the signal path for the E-618.1G model
upgraded with an E-509 servo-control module and an E-517 interface and
display module.
Figure 7: E-618.1G: Interconnections between E-517 Interface, power amplifier
(E-618.10) and E-509 Servo-Controller
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Appendix
6 Appendix
6.1
Lifetime of PICMA® Actuators
The following factors can have an impact on the actuator lifetime and must
be considered:
ƒ
ƒ
ƒ
Applied voltage
Temperature
Relative humidity
The effect of each individual factor on the lifetime can be read off the
diagrams shown below. The lifetime calculated in hours simply results as the
product of all three values read off the diagrams.
The impact of the applied voltage is particularly important. With decreasing
voltage the lifetime increases exponentially. This must always be taken into
consideration in an application. The recommended maximum range of the
control input voltage for E-618 therefore is -2 to 12 V, resulting in a piezo
voltage range of -20 to 120 V. A control input range of -3 to 13 V is possible
(results in -30 to 130 V piezo voltage), but will reduce the actuator lifetime
accordingly.
Fig. 1: Interdependency between the mean MTTF of a PICMA® actuator and
the value of the voltage applied
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Appendix
Fig. 2: Interdependency between the mean MTTF of a PICMA® actuator and
the ambient temperature
Fig. 3: Interdependency between the mean MTTF of a PICMA® actuator and
the relative humidity
Example
The simple formula MTTF = AU * AT * AF provides a quick estimate of the
reliability in hours.
For example, the values for 75% RH ( AF=14), 100 VDC (AU=75) and 45 °C
(AT=100) result in an approximate MTTF of 105,000 h, i.e. more than 11 years
(see markings on the diagrams).
Read the “Tutorial: Piezoelectrics in Positioning” in the PI Catalog for
detailed information.
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Appendix
6.2
Power Bandwidth
The maximum frequency for sinusoidal operation of the E-618 depends on
the actuator capacitance and on the piezo output voltage. It is given by the
following equation:
f max =
P
C ∗ U max ∗ U p − p
f max = maximum operating frequency [Hz]
P=
average power [W]; 100 W with E-618.10 amplifier modules
C=
piezo actuator capacitance.
Note that the actuator capacitance values given in the technical
data tables are small-signal values. For large signal conditions
(actuator deflection is at least 10% of the travel range), multiply the
small-signal capacitance value by 2.
U max = nominal voltage of the amplifier [V]; 180 V with E-618.10
U p − p = peak-to-peak drive voltage [V], i.e. the piezo output voltage
(peak-to-peak)
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