Bucher Hydraulics EVS-AU1-2500 Series User manual

Reference: 400-B-900009-EN-00
Issue: 10.2021 1/24
Operating Instruction
Universal power amplifier for proportional valves
Series EVS-AU1-2500… & EVS-AI1-2500…

Reference: 400-B-900009-EN-00
Issue: 10.2021 2/24
Published by
Bucher Hydraulics AG Frutigen
Schwandistrasse 25
CH-3714 Frutigen
Phone [phone]
Email [email protected]
Internet www.bucherhydraulics.com
© 2021 by Bucher Hydraulics AG Frutigen, CH-3714 Frutigen
All rights reserved. This documentation, in whole and/or in part, is protected by copyright. It may not be reproduced,
nor may it be stored, processed, replicated or distributed by electronic means, without written permission from Bucher
Hydraulics.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics
in the legal sense. No assertion regarding either a particular property or the fitness for a particular intended purpose
can be derived or deduced from this information. The information does not relieve users from the duty of conducting
their own evaluations and tests. Because the products are subject to continual improvement, we reserve the right to
amend the product specifications contained in this catalogue. The original language and legal terminology of all Bucher
Hydraulics documentation is exclusively German. Bucher Hydraulics cannot be held liable for any possible errors in
translation.

Reference: 400-B-900009-EN-00
Issue: 10.2021 3/24
CONTENTS
1General Information ............................................................................................................ 5
1.1 Order number ..................................................................................................................5
1.2 Alternative products.........................................................................................................5
1.3 Scope of supply...............................................................................................................5
1.4 Accessories .....................................................................................................................5
1.5 Safety instructions ...........................................................................................................6
2Characteristics .................................................................................................................... 7
2.1 Features ..........................................................................................................................7
2.2 Device description ...........................................................................................................8
3Use and application ............................................................................................................ 9
3.1 Installation instructions ....................................................................................................9
3.2 Commissioning..............................................................................................................10
4Technical description ....................................................................................................... 11
4.1 Input and output signals ................................................................................................11
4.2 LED definitions ..............................................................................................................11
4.3 Block diagram................................................................................................................12
4.4 Typical wiring.................................................................................................................12
4.5 Technical data ...............................................................................................................13
5Manual parametrization .................................................................................................... 14
5.1 Parameter overview.......................................................................................................14
5.2 Procedural method ........................................................................................................15
6Parameters......................................................................................................................... 15
6.1 Parameter list ................................................................................................................15
7Parameter description ...................................................................................................... 16
7.1 LG (Changing language) ...............................................................................................16
7.2 MODE (Switching between parameter groups) .............................................................16
7.3 AIN ((Analogue input scaling)........................................................................................16
7.4 LIM (Signal monitoring) .................................................................................................18
7.5 R (Command signal ramp time).....................................................................................18
7.6 MIN (Overlap compensation) / MAX (output scaling) / TRIGGER (Threshold value of
MIN)...............................................................................................................................19
7.7 POL (Output polarity).....................................................................................................19
7.8 CURRENT (Rated current range)..................................................................................20
7.9 DAMPL / DFREQ (Ditheramplitude and Dither frequency)............................................20
7.10 PWM (PWM Frequenz) .................................................................................................20
7.11 PPWM / IPWM (Solenoid current controller P gain and I-gain) .....................................21
7.12 PROCESS DATA (Monitoring) ......................................................................................21

Reference: 400-B-900009-EN-00
Issue: 10.2021 4/24
8Appendix............................................................................................................................ 22
8.1 Failure monitoring..........................................................................................................22
8.2 Troubleshooting.............................................................................................................22
9History................................................................................................................................ 24

Reference: 400-B-900009-EN-00
Issue: 10.2021 5/24
1 General Information
1.1 Order number
EVS-AU1-2500-1-30D-A1 - Universal power amplifier with 0... 10V input for
proportional valves
1.2 Alternative products
EVS-AI1-2500-1-30D-A1 - Universal power amplifier with 4...20mA input for
proportional valves
1.3 Scope of supply
The scope of supply includes the module. Cables, adapters and further parts which may be
required should be ordered separately. This documentation can be downloaded as a PDF file
from www.bucherhydraulics.com.
1.4 Accessories
PS1 - GUI for parametrization and monitoring of the power
amplifier (free download from www.bucherhydraulics.com)
EKL-USB-LIN-1-30D-A1 - Programming adapter with USB interface

Reference: 400-B-900009-EN-00
Issue: 10.2021 6/24
1.5 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 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.
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.
•The module may not be used in an explosive environment.
•The device must be disposed of in accordance with national
statutory provisions.

Reference: 400-B-900009-EN-00
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2 Characteristics
This amplifier plug is used to control proportional valves with one solenoid. The compact
solution will be mounted directly on the solenoid.
A typical input signal of 0…10 V (optional 4…20mA) can be used. The output current is closed
loop controlled and therefore independent from the supply voltage and a varying solenoid
resistance.
The parametrization can be done via the PC interface and the EKL-USB-LIN-1-30D-A1
programming adapter or internally via the UP and DOWN buttons.
2.1 Features
•Power amplifier for proportional valves located in a DIN EN 175 301-803-A plug housing
•Digitally reproducible adjustments
•Free scaling of the input signal
•Also usable as Soft-Switch-amplifier (soft switch-on and switch-off)
•M12 connector
•Programmable via USB/LIN bus
•Free parameterization of Ramps, Minimum- and Maximum current, Dither (frequency,
amplitude) and PWM frequency
•Parameter settings via integrated buttons and a selector switch (reduced functionally
against the USB / LINbus)
•Nominal output current range: 0.5… 2.5 A

Reference: 400-B-900009-EN-00
Issue: 10.2021 8/24
2.2 Device description

Reference: 400-B-900009-EN-00
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3 Use and application
3.1 Installation instructions
•All cables which lead outside must be shielded; a complete shielding is required. It is
also a requirement that no strong electro-magnetic interference sources are installed
nearby when using our control and regulation modules.
•The equipment 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:
•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
equipment 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.
•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
•A low-impedance connection between PE and valve must be provided. Transient
interference voltages are conducted from the device directly to the valve and thus to
local grounding.
•Power should be supplied by a regulated power supply unit (typically a PELV system
complying with IEC364-4-4, secure low voltage) or by a battery. 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.

Reference: 400-B-900009-EN-00
Issue: 10.2021 10/24
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.
Switching on for the first
time
Ensure that no unwanted movement is possible in the drive (e. g.
switch off the hydraulics). Connect an amperemeter 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 via the USB interface and the programming adapter
EKL-USB-LIN-1-30D-A1. Please see PS1 software documentation
for how to set up communication.
The communication works in a “half duplex” process. Further
commissioning and diagnosis are supported by the operating
software. Alternatively, the set-up can be done by the internal
parameter selector and the “up” and “down” buttons.
Pre-parameterization
Parameterize now (with the help of the system redundancy and the
connection diagram) the following parameters:
The “analog input”, the output “current” and the typical valve
parameter “dither” and “min/max”.
Pre-parameterization is necessary to minimize the risk of an
unintentional movement.
Control signal
Check the control signal (output signal). The control signal
(solenoid current) lies in the range of 0... 2.5 A. In the current state
it should show around 0 A.
The valve current can also be monitored in the PS1 software.
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).
Activating command
signal
The output current to the valve will follow the input signal
proportionally.
The power stage is always active when power supply exists. Drives
can now leave their position and move to an end position at full
speed. Take safety measures to prevent personal injury and
damage.
Optimize settings Now optimize the remaining parameters according to your
application and your requirements.