W.E.St. Elektronik PAM-195-P-PVG Technical Documentation Manual

Technical Documentation

PAM-195-P-PVG

Power amplifier for directional valves with ratiometric input

CONTENTS

1 General Information ...................................................................................................................................................... 3

1.1 Order Number ....................................................................................................................................................... 3

1.2 Scope of supply .................................................................................................................................................... 3

1.3 Accessories .......................................................................................................................................................... 3

1.4 Symbols used ....................................................................................................................................................... 4

1.5 Legal notice ................................ ................................................................ .......................................................... 4

1.6 Safety instructions ................................................................................................................................................ 5

2 Characteristics .............................................................................................................................................................. 6

2.1 Device description ................................................................................................................................................ 7

3 Use and application ...................................................................................................................................................... 8

3.1 Installation instruction ........................................................................................................................................... 8

3.2 Commissioning ..................................................................................................................................................... 9

4 Function modes and technical description .................................................................................................................. 10

4.1 LED Indications .................................................................................................................................................. 10

4.2 Typical system structure ..................................................................................................................................... 11

4.3 Method of operation ............................................................................................................................................ 11

4.4 Input and output signals ..................................................................................................................................... 12

4.5 Circuit diagram ................................................................................................................................................... 13

4.6 Typical wiring ...................................................................................................................................................... 14

4.7 Input connection (examples)............................................................................................................................... 14

4.8 Technical data .................................................................................................................................................... 15

5 Parameter ................................................................................................................................................................... 16

5.1 Parameter list ..................................................................................................................................................... 16

5.2 Basic parameters ................................................................................................................................................ 17

5.2.1 LG (Changing the language for the help texts) .......................................................................................... 17

5.2.2 MODE (Switching between parameter groups) .......................................................................................... 17

5.2.3 SENS (Failure monitoring) ......................................................................................................................... 17

5.2.4 CCMODE (Activation of the characteristic linearization) ............................................................................ 18

5.3 Input signal adaption .......................................................................................................................................... 18

5.3.1 LIM (Signal monitoring) .............................................................................................................................. 18

5.3.2 RA (Ramp function) ................................................................................................................................... 19

5.4 Output signal adaption ........................................................................................................................................ 20

5.4.1 CC (Characteristics linearization) .............................................................................................................. 20

5.4.2 MIN (Overlap compensation) ................................ ..................................................................................... 21

5.4.3 MAX (Output scaling) ................................................................................................................................. 21

5.4.4 TRIGGER (Threshold value of MIN function) ............................................................................................. 21

5.4.5 SIGNAL:U (Output polarity) ....................................................................................................................... 22

5.5 Parameters of the power stage................................................................................................ ........................... 22

5.5.1 CURRENT (Nominal output current) .......................................................................................................... 22

5.5.2 DAMPL (Dither amplitude) ......................................................................................................................... 22

5.5.3 DFREQ (Dither frequency) ......................................................................................................................... 22

5.5.4 PWM (PWM frequency) ............................................................................................................................. 23

5.5.5 ACC (Auto adaptation of the closed loop current controller) ...................................................................... 23

5.5.6 PPWM (Solenoid current controller P gain) ............................................................................................... 24

5.5.7 IPWM (Solenoid current controller I gain) .................................................................................................. 24

5.6 Process data (Monitoring) .................................................................................................................................. 24

6 Appendix .................................................................................................................................................................... 25

6.1 Failure monitoring ............................................................................................................................................... 25

6.2 Troubleshooting .................................................................................................................................................. 25

6.3 Description of the command structure ................................................................................................................ 26

7 Notes .......................................................................................................................................................................... 27

Page 2 of 27 PAM-195-P-PVG 18.06.2019

1

1 General Information

1.1 Order Number

PAM-195-P-PVG-22301 - 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)

The number of the version consists of the hardware-version (first two digits) and the software-version (second 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.

Page 3 of 27 PAM-195-P-PVG 18.06.2019

1.4 Symbols used

General information

Safety-related information

1.5 Legal notice

W.E.St.

Gewerbering 31
D-41372 Niederkrüchten

Tel.: [phone]
Fax.: [phone]

Homepage: www.w-e-st.de or www.west-electronics.com
EMAIL: [e-mail]

Date: 18.06.2019

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.

Elektronik GmbH

Page 4 of 27 PAM-195-P-PVG 18.06.2019

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 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, 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.

Page 5 of 27 PAM-195-P-PVG 18.06.2019

2 Characteristics

This module is used for the control of a directional valve with two solenoids. Various adjustable parameters
allow 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.

Setpoint setting is realized via a ratiometric input. That means the command signal is provided as precentral
value relating to the supply voltage. For that the relevant voltage is measured at a separate input. Via another
input the command value is set by a signal between 25% and 75% of the supply voltage with 50% as zero po­sition.

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 with ratiometric joysticks (Danfoss compatible control).

Features

 Control of directional valves
 Compact housing
 Digital reproducible adjustments
 Ratiometric command value input
 Separate reference input for the ratiometric command 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

Page 6 of 27 PAM-195-P-PVG 18.06.2019

V:

ID:

Add.:Date:

Made in Germany

W.E.ST.

Ready

1 2 3 4

5 6 7 8

9 10 11 12

14 15 1613

D-41372 Niederkrüchten
Homepage: http://www.w-e-st.de

W.E. ST.

Elektronik

131415

9

10

11

12

16

A B

Klemmblöcke (steckbar)
Terminals (removable)

LEDs

USB
interface

Typenschild und Anschlussbelegung
Type plate and terminal pin assignment

23,0000 mm99,0000 mm

114,0000 mm

2.1 Device description

Page 7 of 27 PAM-195-P-PVG 18.06.2019

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 con­trol 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 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 > 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 partic­ular. 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 8 of 27 PAM-195-P-PVG 18.06.2019

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 imme­diately 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.

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 approxi­mately 0 A.
ATTENTION! You can monitor the current of the solenoids also in the WPC-300 pro­gram.

Switching on the hydrau­lics

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 per­sonal injury and damage.

The amplifier can be controlled now via the command value input.

3.2 Commissioning

Page 9 of 27 PAM-195-P-PVG 18.06.2019