W.E.S.T. Elektronik PAM-195-P-S3 Guide

Technical Documentation
PAM-195-P-S3
Power amplifier for directional valves with integrated power limitation function

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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 Legal notice..........................................................................................................................................................5
1.6 Safety instructions................................................................................................................................................6
2Characteristics..............................................................................................................................................................7
2.1 Device description................................................................................................................................................8
3Use and application......................................................................................................................................................9
3.1 Installation instruction...........................................................................................................................................9
3.2 Commissioning...................................................................................................................................................10
3.3 Range of applications.........................................................................................................................................11
3.3.1 Limitation of the output power....................................................................................................................11
3.3.2 Limitation of the input/common power .......................................................................................................11
4Function modes and technical description.................................................................................................................. 12
4.1 LED Indications ..................................................................................................................................................12
4.2 Typical system structure.....................................................................................................................................13
4.3 Method of operation............................................................................................................................................13
4.4 Input and output signals .....................................................................................................................................14
4.5 Circuit diagram ...................................................................................................................................................15
4.6 Typical wiring......................................................................................................................................................16
4.7 Input connection (examples)...............................................................................................................................17
4.8 Technical data....................................................................................................................................................18
5Parameter................................................................................................................................................................... 19
5.1 Parameter list .....................................................................................................................................................19
5.2 Basic parameters................................................................................................................................................21
5.2.1 LG (Changing the language for the help texts) ..........................................................................................21
5.2.2 MODE (Switching between parameter groups)..........................................................................................21
5.2.3 AINMODE (Mode of input scaling).............................................................................................................21
5.2.4 SENS (Failure monitoring).........................................................................................................................22
5.2.5 CCMODE (Activation of the characteristic linearization)............................................................................22
5.2.6 SOLENOIDS (One or two solenoids).........................................................................................................22
5.2.7 POL (Output polarity).................................................................................................................................23
5.3 Input signal adaption ..........................................................................................................................................23
5.3.1 SIGNAL (Switching the type of input signal)..............................................................................................23
5.3.2 AIN (Analogue input scaling) .....................................................................................................................24
5.3.3 SYS_RANGE (Rated pressure of the system)...........................................................................................25
5.3.4 N_RANGE:X (Nominal pressure of the sensor).........................................................................................25
5.3.5 OFFSET:X (Zero point setting of the sensor).............................................................................................25
5.3.6 RA (Ramp function) ...................................................................................................................................26
5.4 Power limitation function.....................................................................................................................................26
5.4.1 PL:V (Power limitation factor) ....................................................................................................................26
5.4.2 PL:T1 (Dynamic of the power limitation function).......................................................................................26
5.5 Output signal adaption........................................................................................................................................27
5.5.1 CC (Characteristics linearization) ..............................................................................................................27
5.5.2 MIN (Overlap compensation).....................................................................................................................28
5.5.3 MAX (Output scaling).................................................................................................................................28
5.5.4 TRIGGER (Threshold value of MIN function).............................................................................................28
5.6 Parameters of the power stage...........................................................................................................................29

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5.6.1 CURRENT (Nominal output current)..........................................................................................................29
5.6.2 DAMPL (Dither amplitude).........................................................................................................................29
5.6.3 DFREQ (Dither frequency).........................................................................................................................29
5.6.4 PWM (PWM frequency) .............................................................................................................................30
5.6.5 ACC (Auto adaptation of the closed loop current controller)......................................................................30
5.6.6 PPWM (Solenoid current controller P gain)................................................................................................31
5.6.7 IPWM (Solenoid current controller I gain) ..................................................................................................31
5.7 Process data (Monitoring)...................................................................................................................................31
6Appendix.....................................................................................................................................................................32
6.1 Failure monitoring...............................................................................................................................................32
6.2 Troubleshooting..................................................................................................................................................32
6.3 Differences to former product generations..........................................................................................................33
6.3.1 Baudrate of the serial Interface..................................................................................................................33
6.3.2 Output current adjustment / MIN_MAX / RCURR ......................................................................................33
6.4 Description of the command structure................................................................................................................34
7Notes..........................................................................................................................................................................35

Page 4 of 35 PAM-195-P-S3 05.06.2020
1 General Information
1.1 Order Number
PAM-195-P-S3 - power amplifier for directional valves with integrated power limitation function
1.2 Scope of supply
The scope of supply includes the module plus the terminal blocks which are a 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)
Any standard cable with USB-A and USB-B connector can be used as the programming cable.

Page 5 of 35 PAM-195-P-S3 05.06.2020
1.4 Symbols used
General information
Safety-related information
1.5 Legal notice
W.E.St. Elektronik GmbH
Gewerbering 31
D-41372 Niederkrüchten
Tel.: [phone]
Fax.: [phone]
Home page: www.w-e-st.de
EMAIL: [e-mail]
Date: 05.06.2020
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.

Page 6 of 35 PAM-195-P-S3 05.06.2020
1.6 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 protec-
tion) 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 as-
sembly. 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 in-
struction 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, contamina-
tion 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 module is used for the control of a directional valve with two solenoids or a pressure or throttle valve with
one solenoid. Various adjustable parameters allow for an optimized adaptation to the respective valve. The
integrated power amplifier with a short cycle time of 0,125 ms for the current loop is an inexpensive and
space-saving solution.
Additionally to the amplifier function a power limitation functionality via an analogue input was implemented.
Switching the direction was realized by a digital switching input. It is also possible to do it with an adapted
scaling of the command input. Within that a simple unipolar output of a plc can control this amplifier. Control-
ling it with a bipolar signal from -10 to 10V is possible, too.
The output current is closed loop controlled and therefore independent from the power supply and the solenoid
resistance. The output stage is monitored for cable breakdown, is short circuit proof and disables the power
stage in case of an error.
RAMP, MIN and MAX, the DITHER (frequency and amplitude) and the PWM frequency are programmable.
In addition, the valve characteristics can be linearized via 10 XY-points. For example: using pressure valves a
linear behavior between input signal and pressure can be reached.
Typical applications: Control of directional, throttle and pressure valves, which need a flexible adaptation of the
solenoid control. All typical proportional valves of the different manufactures (BOSCH, REXROTH, PARKER,
EATON ...) can be controlled.
Features
Control of directional, pressure or throttle valves
Compact housing
Digital reproducible adjustments
Free scaling of the analogue inputs
Power limitation functionality via analogue input
Unipolar controlling with direction switch
Bipolar controlling via differential input
Characteristics linearization via 10 XY-points per direction
Free parameterization of RAMPS, MIN und MAX, output current, DITHER (frequency, amplitude)
Nominal output current range: 0,5… 2,6 A
Simple and application orientated parameter settings via WPC-software
Failure monitoring and extended function check

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2.1 Device description
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-41372 Niederkrüchten
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
114,0000 mm

Page 9 of 35 PAM-195-P-S3 05.06.2020
3 Use and application
3.1 Installation instruction
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 a requirement that no strong
electro-magnetic interference sources are installed nearby when using our open and closed loop con-
trol modules.
Typical installation location: 24V 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 space close to the PLC (24 V area) is most suitable. All digital
and analogue inputs and outputs are fitted with filters and surge protection 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-connected ground wir-
ing 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 > 3m. 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 possi-
ble. 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.
With 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).
Particular care is required with cables of over 40 m in length –the manufacturer should be
consulted if necessary.
A low-resistance connection between PE and the mounting rail should be provided. Transient interfer-
ence 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 partic-
ular. Switched inductances (relays and valve coils connected to the same power supply) must always
be provided with appropriate overvoltage protection directly at the coil.

Page 10 of 35 PAM-195-P-S3 05.06.2020
3.2 Commissioning
Step
Task
Installation
Install the device in accordance with the circuit diagram. Ensure it is wired correctly
and that the signals are well shielded. The device must be installed in a protective
housing (control cabinet or similar).
Switching on for the first
time
Ensure that no unwanted movement is possible in the drive (e.g. switch off the
hydraulics). Connect an ammeter and check the current consumed by the device. If
it is higher than specified, there is an error in the wiring. Switch the device off imme-
diately and check the wiring.
Setting up communication
Once the power input is correct the PC (notebook) should be connected to the
serial interface. Please see the WPC-300 program documentation for how to set up
communication.
CAUTION! Compared to older modules the standard baudrate of the interface
was changed to 57600 Baud. Please set the WPC-300 to 57600 Baud or to the
automatic baudrate recognition as described under OPTIONS/SETTINGS, point
6.3.1.
ATTENTION! A USB driver has to be installed and properly configured.
See WPC-300 short guideline.
Further commissioning and diagnosis are supported by the operating software.
ATTENTION! The COMPORT (in WPC-300) has to be closed before the USB plug
is to be disconnected. Otherwise the WPC-300 is going to be instable.
Pre-parameterization
Now set up the following parameters (with reference to the system design and circuit
diagrams):
The nominal output CURRENT and the typical valve parameters such as DITHER
and MIN/MAX.
Pre-parameterization is necessary to minimize the risk of uncontrolled movements.
Control signal
Check the control signal with an amp meter. The control signal (the current of the
solenoid) is within the range of 0... 2, 6A. In the actual status it should show approxi-
mately 0 A.
ATTENTION! You can monitor the current of the solenoids also in the WPC-300 pro-
gram.
Switching on the hydrau-
lics
The hydraulics can now be switched on. The module is not yet generating a signal.
Drives should be at a standstill or drift slightly (leave its position at a slow speed) if it
is a proportional valve.
Activating ENABLE
CAUTION! The drive can now leave its position and move to an end position with full
speed or the pressure can reach maximum. Take safety measures to prevent per-
sonal injury and damage.