W.E.S.T. Elektronik POS-123-P Guide

Technical Documentation
POS-123-U
POS-123-P
POS-123-U-SSI
Universal positioning module, alternatively with power output stage or SSI interface

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CONTENTS
1General Information.................................................................................................................................................4
1.1 Order number................................................................................................................................................. 4
1.2 Scope of supply.............................................................................................................................................. 4
1.3 Accessories.................................................................................................................................................... 4
1.4 Symbols used................................................................................................................................................. 5
1.5 Using this documentation ............................................................................................................................... 5
1.6 Legal notice.................................................................................................................................................... 5
1.7 Safety instructions.......................................................................................................................................... 6
2Characteristics.........................................................................................................................................................7
2.1 Compatibility................................................................................................................................................... 8
2.2 Device description.......................................................................................................................................... 9
3Use and application...............................................................................................................................................10
3.1 Installation instructions ................................................................................................................................. 10
3.2 Typical system structure............................................................................................................................... 11
3.3 Method of operation...................................................................................................................................... 11
3.4 Commissioning............................................................................................................................................. 13
3.5 The Start-Up assistant.................................................................................................................................. 14
4Technical description.............................................................................................................................................15
4.1 Input and output signals ............................................................................................................................... 15
4.2 LED definitions ............................................................................................................................................. 16
4.3 Circuit diagram ............................................................................................................................................. 17
4.4 Typical wiring................................................................................................................................................ 18
4.5 Connection examples................................................................................................................................... 18
4.6 Technical data.............................................................................................................................................. 19
5Parameters............................................................................................................................................................20
5.1 Parameter overview...................................................................................................................................... 20
5.2 Configuration................................................................................................................................................ 22
5.2.1 LG (Changing the language).................................................................................................................22
5.2.2 MODE (Switching between parameter groups).....................................................................................22
5.2.3 SENS (monitoring of the modul functions)............................................................................................22
5.2.4 EOUT (Output signal: READY = OFF)..................................................................................................23
5.2.5 HAND (Manual speed)..........................................................................................................................23
5.2.6 INPOS (In position range).....................................................................................................................24
5.3 Signal adaptation.......................................................................................................................................... 24
5.3.1 SYS_RANGE (Working stroke).............................................................................................................24
5.3.2 SIGNAL (Type of input).........................................................................................................................24
5.3.3 N_RANGE:X (Nominal range of the sensor).........................................................................................25
5.3.4 OFFSET:X (Sensor offset)....................................................................................................................25
5.3.5 Using of the commands SYS_RANGE, N_RANGE:X and OFFSET:X .................................................26
5.4 Speed commands......................................................................................................................................... 27
5.4.1 VELO (Internal speed demand value)...................................................................................................27
5.4.2 VRAMP (Ramp time for external speed demand).................................................................................27
5.5 Profile generator........................................................................................................................................... 28
5.5.1 VMODE (Methode of positioning).........................................................................................................28
5.5.1 ACCEL (Acceleration in NC mode).......................................................................................................28
5.5.2 VMAX (Maximum speed in NC mode)..................................................................................................28
5.6 Control parameter......................................................................................................................................... 29
5.6.1 A (Acceleration (ramp) time).................................................................................................................29
5.6.2 D (Deceleration / braking distance).......................................................................................................29
5.6.3 V0(Loop gain setting) ...........................................................................................................................30
5.6.4 V0:RES (Scaling of the loop gain) ........................................................................................................30
5.6.5 PT1 (Timing of the controller) ...............................................................................................................31

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5.6.6 CTRL (Deceleration characteristics) .................................................................................................... 31
5.7 Output signal adaptation............................................................................................................................... 32
5.7.1 MIN (Deadband compensation) ........................................................................................................... 32
5.7.2 MAX (Output scaling)........................................................................................................................... 32
5.7.3 TRIGGER (Response threshold for the MIN parameter)...................................................................... 32
5.7.4 OFFSET (Zero correction) ................................................................................................................... 33
5.7.5 SIGNAL:U (Type and polarity of the output signal) .............................................................................. 33
5.8 Special commands ....................................................................................................................................... 34
5.8.1 Drift compensation / high accurate positioning..................................................................................... 34
5.8.2 AINMODE............................................................................................................................................ 36
5.9 Process data................................................................................................................................................. 37
6Appendix............................................................................................................................................................... 38
6.1 Failure monitoring......................................................................................................................................... 38
6.2 Troubleshooting............................................................................................................................................ 38
6.3 Description of the command structure.......................................................................................................... 40
7ADDITIONAL INFORMATION: Power output stage ............................................................................................. 41
7.1 General function ........................................................................................................................................... 41
7.2 Device description ........................................................................................................................................ 42
7.3 Inputs and outputs........................................................................................................................................ 43
7.4 Circuit diagram.............................................................................................................................................. 43
7.5 Typical wiring................................................................................................................................................ 44
7.6 Technical data .............................................................................................................................................. 44
7.7 Parameter overview of the power station...................................................................................................... 45
7.8 Parameter description of the power stage .................................................................................................... 45
7.8.1 SIGNAL:M (Type of the monitor output signal) .................................................................................... 45
7.8.2 SIGNAL:U (Polarity of the output signal).............................................................................................. 45
7.8.3 CURRENT (Rated output current) ....................................................................................................... 46
7.8.4 DFREQ (Dither frequency)................................................................................................................... 46
7.8.5 DAMPL (Dither amplitude)................................................................................................................... 46
7.8.6 PWM (PWM Frequenz)........................................................................................................................ 46
7.8.7 ACC (Current loop ato adjustment )..................................................................................................... 47
7.8.8 PPWM (Solenoid current controller P element).................................................................................... 47
7.8.9 IPWM (Solenoid current controller I element) ...................................................................................... 47
7.8.10 IMS (theoretical maximum current drain)............................................................................................. 48
8ADDITIONAL INFORMATION: SSI interface........................................................................................................ 49
8.1 General function ........................................................................................................................................... 49
8.2 Device description ........................................................................................................................................ 50
8.3 Inputs and outputs........................................................................................................................................ 51
8.4 Circuit diagram.............................................................................................................................................. 52
8.5 Typical wiring................................................................................................................................................ 53
8.6 Technical data .............................................................................................................................................. 53
8.7 Special versions............................................................................................................................................ 54
8.8 Parameter overview of the SSI interface ...................................................................................................... 54
8.9 Parameter description of the SSI interface................................................................................................... 55
8.9.1 SELECT:X (Define sensor type) .......................................................................................................... 55
8.9.2 SSI:RANGE (Sensor nominal length) .................................................................................................. 55
8.9.3 SSI:OFFSET (Sensor offset)................................................................................................................ 55
8.9.4 SSI:POL (Signal direction)................................................................................................................... 55
8.9.5 SSI:RES (Signal resolution)................................................................................................................. 56
8.9.6 SSI:BITS (Number of data bits)............................................................................................................ 56
8.9.7 SSI:CODE (Signal coding)................................................................................................................... 56
8.9.8 SSI:ERRBIT (Position of the “out of range” bit).................................................................................... 56
9Notes.................................................................................................................................................................... 57

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1 General Information
1.1 Order number
POS-123-U
1
-2030
2
- with programmable output (±10 V differential output or 4… 20 mA) and analogue
sensor interface
POS-123-P-2030 - with integrated power output stage up to 2,6 A (see additional information)
POS-123-U-SSI-2030 - with programmable output (±10 V differential output or 4… 20 mA), SSI sensor
interface and 0… 10 V output as a diagnosis signal for the SSI sensor
(see additional information)
Extended versions
PPC-125-U-PDP - with extended position and pressure control, SSI or analogue sensor interface and
Profibus interface
UHC-126-U-ETC - with extended position and pressure control, SSI or analogue sensor interface and
Ethernet interface (Ethercat, Profinet, …)
1.2 Scope of supply
The scope of supply includes the module plus the terminal blocks which are part of the housing.
The Profibus plug, interface cables and further parts which may be required should be ordered separately.
This documentation can be downloaded as a PDF file from www.w-e-st.de.
1.3 Accessories
WPC-300 - Start-Up-Tool (downloadable from our homepage –products/software)
1
Compared with older versions (ordering code Afor voltages output and Ifor current output) the code U(universal) is
used for programmable outputs.
2
The number of the version consists of the hardware version (first two digits) and the software version (last two digits).
Because of the development of the products these numbers can vary. They are not strictly necessary for the order. We will
always deliver the newest version.

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1.4 Symbols used
General information
Safety-related information
1.5 Using this documentation
Structure of the documentation:
The standard product is descibed up to chapter 6. The extensions like POWER STAGE or SSI-INTERFACE
are described in the chapters ADDITIONAL INFORMATION.
1.6 Legal notice
W.E.St. Elektronik GmbH
Gewerbering 31
D-41372 Niederkrüchten
Tel.: [phone]
Fax.: [phone]
Home page: www.w-e-st.de or www.west-electronics.com
EMAIL: [email protected]
Date: 23.08.2019
The data and characteristics described herein serve only to describe the product. The user is required to
evaluate this data and to check suitability for the particular application. General suitability cannot be inferred
from this document. We reserve the right to make technical modifications due to further development of the
product described in this manual. The technical information and dimensions are non-binding. No claims may
be made based on them.
This document is protected by copyright.

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1.7 Safety instructions
Please read this document and the safety instructions carefully. This document will help to define the product
area of application and to put it into operation. Additional documents (WPC-300 for the start-up software) and
knowledge of the application should be taken into account or be available.
General regulations and laws (depending on the country: e. g. accident prevention and environmental
protection) must be complied with.
These modules are designed for hydraulic applications in open or closed-loop control circuits.
Uncontrolled movements can be caused by device defects (in the hydraulic module or the
components), application errors and electrical faults. Work on the drive or the electronics must
only be carried out whilst the equipment is switched off and not under pressure.
This handbook describes the functions and the electrical connections for this electronic
assembly. All technical documents which pertain to the system must be complied with when
commissioning.
This device may only be connected and put into operation by trained specialist staff. The
instruction manual must be read with care. The installation instructions and the commissioning
instructions must be followed. Guarantee and liability claims are invalid if the instructions are
not complied with and/or in case of incorrect installation or inappropriate use.
CAUTION!
All electronic modules are manufactured to a high quality. Malfunctions due to the failure of
components cannot, however, be excluded. Despite extensive testing the same also applies
for the software. If these devices are deployed in safety-relevant applications, suitable external
measures must be taken to guarantee the necessary safety. The same applies for faults which
affect safety. No liability can be assumed for possible damage.
Further instructions
The module may only be operated in compliance with the national EMC regulations. It is
the user’s responsibility to adhere to these regulations.
The device is only intended for use in the commercial sector.
When not in use the module must be protected from the effects of the weather,
contamination and mechanical damage.
The module may not be used in an explosive environment.
To ensure adequate cooling the ventilation slots must not be covered.
The device must be disposed of in accordance with national statutory provisions.

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2 Characteristics
This electronic module has been developed for controlling hydraulic positioning drives. Proportional valves
with integrated or external electronics can be controlled with the differential output.
The internal profile generation is optimized for stroke-dependent deceleration or the NC control mode. The
controller and the controller settings are adapted to typical requirements and thus permit rapid and uncritical
optimization of the control behavior. The optimized control function offers a high degree of precision together
with high stability for hydraulic drives. The movement cycle is controlled via the external position and speed
inputs.
The high resolution of the analogue signals ensures good positioning behavior.
Alternatively, the P version is available with an integrated power output stage (see additional information:
POWER OUTPUT STAGE). The advantage of the integrated power output stage is founded in the integrated
control behavior without additional dead times. This allows higher dynamics and higher stability respectively.
The SSI extension is available for use with digital sensors (see additional information: SSI INTERFACE).
Sensors with a resolution of one µm can be used for very high position accuracy.
Setting up this module is simple and easy to handle with our WPC-300 start-up software.
Typical applications: general positioning drives, fast transport drives, handling systems, speed-controlled axes
and also tracer control.
Features
Analogue position and speed inputs
Analogue feedback sensors
Simple and intuitive scaling of the sensor
Optional: start-up assistant for fast and simple adjusting of the control parameter
Motion command values in mm resp. mm/s
Internal profile definition by acceleration, velocity and deceleration
Principle of stroke-dependent deceleration for fast and robust positioning
NC profile generator for constant speed
Expanded closed loop control technology
Highest positioning accuracy by using the drift compensation
Usable with overlapped proportional valves and with zero lapped control valves
Fault diagnosis and extended function checking
Simplified parameterization with WPC-300 software
Optionally:
oIntegrated power output stage (P version)
oSSI Sensor interface

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2.1 Compatibility
As a result of further developments some smaller changes have to be taken in consideration.
Functionality:
1. Downward compatible to the older modules.
2. 100 % wiring compatible.
3. Baud rate: The default baud rate has changed from 9600 baud to 57600 baud. This is adaptable in
WPC-300:OPTIONS/SETTINGS/INTERFACE.
FIXBAUDRATE = 57600 and/or AUTO BAUDRATE DETECTION = 57600
4. Technical enhancements:
a. Programmable analogue output: only one version (Uinstead Aand I) is necessary
b. Improved profile generator
c. Independent adjustment between SDD and NC mode
d. PT1 filter to stabilize the control behavior
e. Drift compensation and/or high accurate positioning
f. Start-up support
Parameterization:
1. Standardizing of parameter names
2. Simplified and intuitive parameterization of the analogue inputs and sensors
3. Compatibility mode of the input scaling (AINMODE), if necessary
4. Adaptation of the output signal (current or voltages) and the polarity with the command SIGNAL:U
(the POL commando is removed)

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2.2 Device description
Standard module –for the P-Version look at point 7.2
V:
ID:
Add.:Date:
Made in Germany
W.E.ST.
Ready
1 2 3 4
5 6 7 8
910 11 12
14 15 1613
D-41372Niederkrüchten
Homepage: http://www.w-e-st.de
W.E.ST. Elektronik
13 14 15
910 11 12
16
A B
Klemmblöcke (steckbar)
Terminals (removable)
LEDs
USB-Interface
Typenschild undAnschlussbelegung
Type plate and terminal pin assignment
23,0000 mm99,0000 mm
114,0000mm

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3 Use and application
3.1 Installation instructions
This module is designed for installation in a shielded EMC housing (control cabinet). All cables which
lead outside must be screened; complete screening is required. It is also necessary to avoid strong
electro-magnetic interference sources being installed nearby when using our open and closed loop
control modules.
Typical installation location: 24 V control signal area (close to PLC)
The devices must be arranged in the control cabinet so that the power section and the signal section
are separate from each other.
Experience shows that the installation place close to the PLC (24 V area) is most suitable. All digital
and analogue inputs and outputs are fitted with filters and surge absorbers in the device.
The module should be installed and wired in accordance with the documentation bearing in mind EMC
principles. If other consumers are operated with the same power supply, a star-shaped ground wiring
scheme is recommended. The following points must be observed when wiring:
The signal cables must be laid separately from power cables.
Analogue signal cables must be screened.
All other cables must be screened if there are powerful interference sources (frequency
converters, power contactors) and cable lengths > 3 m. Inexpensive SMD ferrites can be
used with high-frequency radiation.
The screening should be connected to PE (PE terminal) as close to the module as
possible. The local requirements for screening must be taken into account in all cases. The
screening should be connected to at both ends. Equipotential bonding must be provided
where there are differences between the connected electrical components.
If having longer lengths of cable (> 10 m), the diameters and screening measures should
be checked by specialists (e. g. for possible interference, noise sources and voltage drop).
Special care is required if using cables of over 40 m in length, and if necessary the
manufacturer should be consulted if necessary.
A low-resistance connection between PE and the mounting rail should be provided. Transient
interference is transmitted from the module directly to the mounting rail and from there to the local
earth.
Power should be supplied by a regulated power supply unit (typically a PELV system complying with
IEC364-4-4, secure low voltage). The low internal resistance of regulated power supplies gives better
interference voltage dissipation, which improves the signal quality of high-resolution sensors in
particular. Switched inductances (relays and valve coils) which are connected to the same power
supply must always be provided with appropriate overvoltage protection directly at the coil.