WEST PQP-171-P Guía

Technical Documentation

PQP-171-P

Universal pump control module

Page 2 of 34 PQP-171-P 05.06.2020

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 instructions ................................................................................................................................... 9

3.2 Typical system structure............................................................................................................................... 10

3.3 Method of operation...................................................................................................................................... 10

3.4 Commissioning............................................................................................................................................. 12

4Technical description.............................................................................................................................................13

4.1 Input and output signals ............................................................................................................................... 13

4.2 LED definitions ............................................................................................................................................. 13

4.3 Circuit diagram ............................................................................................................................................. 14

4.4 Typical wiring................................................................................................................................................ 15

4.5 Connection examples................................................................................................................................... 15

4.6 Technical data.............................................................................................................................................. 16

5Parameters............................................................................................................................................................17

5.1 Parameter overview...................................................................................................................................... 17

5.2 Basic parameters.......................................................................................................................................... 19

5.2.1 LG (Changing the language).................................................................................................................19

5.2.2 MODE (Parameter view).......................................................................................................................19

5.2.3 FIXCURR (Fix output value).................................................................................................................19

5.2.4 CTRLMODE (Control function) .............................................................................................................19

5.2.5 CCMODE (Characteristics linearization)...............................................................................................20

5.2.6 SENS (Malfunction monitor) .................................................................................................................20

5.2.7 EOUT (Output signal if not ready).........................................................................................................20

5.3 InSignal adaptation....................................................................................................................................... 21

5.3.1 SIGNAL (Type of input signal)..............................................................................................................21

5.3.2 N_RANGE:X (Sensor nominal pressure)..............................................................................................21

5.3.3 OFFSET:X (Sensor offset)....................................................................................................................21

5.3.4 RA (Command signal ramp time)..........................................................................................................22

5.3.5 CC (Characteristics linearization) .........................................................................................................23

5.4 Control parameters....................................................................................................................................... 24

5.4.1 PID controller........................................................................................................................................24

5.4.2 Integrator control function.....................................................................................................................25

5.4.3 C_EXT (Extended control parameters).................................................................................................25

5.5 Output signal adaptation............................................................................................................................... 26

5.5.1 MIN (Deadband compensation)............................................................................................................26

5.5.2 MAX (Output scaling)............................................................................................................................26

5.5.3 TRIGGER (Response threshold for the MIN parameter) ......................................................................26

5.5.4 SIGNAL:U (Output polarity) ..................................................................................................................27

5.6 Power stage.................................................................................................................................................. 28

5.6.1 CURRENT (Rated solenoid current).....................................................................................................28

5.6.2 DFREQ (Dither frequency)....................................................................................................................28

5.6.3 DAMPL (Dither amplitude)....................................................................................................................28

Page 3 of 34 PQP-171-P 05.06.2020

5.6.4 PWM (PWM Frequency)...................................................................................................................... 29

5.6.5 ACC (Current loop auto adjustment).................................................................................................... 29

5.6.6 PPWM (P gain of the current loop) ...................................................................................................... 29

5.6.7 IPWM (I gain of the current loop)......................................................................................................... 29

5.7 Special commands ....................................................................................................................................... 30

5.7.1 AINMODE (Scaling mode)................................................................................................................... 30

5.7.2 AIN (Analogue input scaling)................................................................................................................ 30

5.8 PROCESS DATA (Monitoring)...................................................................................................................... 31

6Appendix............................................................................................................................................................... 32

6.1 Failure monitoring......................................................................................................................................... 32

6.2 Troubleshooting............................................................................................................................................ 32

7Notes.................................................................................................................................................................... 34

Page 4 of 34 PQP-171-P 05.06.2020

1 General Information

1.1 Order number

PQP-171-P - pump control module with integrated power output stage up to 2,6 A and analouge

sensor interface

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)

Any standard cable with USB-A and USB-B connector can be used as the programming cable.

Page 5 of 34 PQP-171-P 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.: +49 (0)2163 577355-0

Fax.: +49 (0)2163 577355-11

Home page: www.w-e-st.de

EMAIL: contact@w-e-st.de

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 copyright.

Page 6 of 34 PQP-171-P 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

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.

Page 7 of 34 PQP-171-P 05.06.2020

2 Characteristics

This module is used as universal closed loop control module, e.g. for displacement swivel angel control. It has

an integrated power amplifier for proportional valves. Several setting parameters offer optimal adaption to the

valve. The controller runs with a loop time of 1 ms and the amplifier with 0,125 ms for the current control.

The command value and the feedback value are driven by scalable analogue signals (range 0… 10V or 4…

20mA). Ramp function and PID controller can be used universal. The output current is closed loop controlled

and therefore independent from the supply voltage and a varying solenoid resistance. The output stage is ca-

ble broken monitored and switches off in case of detected error.

Programmable are the following control parameters: SC, P, I, D, T1 and LIM for the integrator limitation as well

as different static settings and valve adjustments for the power stage like MIN, MAX, DITHER (in frequency

and amplitude) and the PWM frequency.

By the free parameterization of the power stage all typical proportional valves of the different manufactures

can be optimal adapted.

Because of the easy handling a very short training period is guaranteed.

Typical applications: General pressure control with pressure valves (direct or via a servo pump).

Features

Universal pump control module for proportional directional valves

Compact housing

Digital reproducible adjustments

Free scaling of the analogue input signals

Universal PID controller

Free parameterization of ramps, MIN and MAX, DITHER (frequency and amplitude) and

PWM frequency

Output current up to 2,6 A

Adaptable to all standard proportional valves

Application orientated parameter settings

Fault diagnosis and extended function checking

Simplified parameterization with WPC-300 software

Page 8 of 34 PQP-171-P 05.06.2020

2.1 Device description

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

A B

Klemmblöcke (steckbar)

Terminals (removable)

LEDs

USB

Interface

Typenschild undAnschlussbelegung

Type plate and terminal pinassignment

23,0000 mm99,0000 mm

114,0000 mm

Page 9 of 34 PQP-171-P 05.06.2020

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.

Page 10 of 34 PQP-171-P 05.06.2020

3.2 Typical system structure

This minimal system consists of the following components:

(*1) Swivel angel adjustment

(*2) Servo pump

(*3) Swivel angel sensor

(*4) Pump controller PQP-171-P

(*5) Interface to PLC

3.3 Method of operation

This swivel angel controller is driven via an analogue signal. The ENABLE signal (typical 24 V) activates the

functionality and reports this at a READY output if no error occurs.

In case of malfunction the power stage gets deactivated and the error is reported by a deactivated READY

output and a flashing READY LED.

The output is current controlled whereby a high accuracy and a good dynamic is obtained.

In this system the speed of the cylinder is adjusted by the swivel angel of the pump. Because of the relatively

pressure independent volume flow compared to a throttle control with a proportional valve the actuator can be

driven by relative continual speed.

The system is realized by an electro-hydraulic control equipment controlled by our module. As feedback the

swivel angel is measured and send back to the module.

Via a modified and optimized PID controller the behavior can be adapted to the respective pump.

The valve controlling can be switched between such with one solenoid and also two solenoids (shown on pic-

tures 1 and 2).

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