Hydraulic proportional valve control | Modules from WEST Elektronik GmbH

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W.E.St. has been manufacturing electronic assemblies for hydraulic applications for more than 20 years and supplies well-known companies in this sector. In addition to a wide range of different power amplifiers (chopper amplifiers), there are also positioning modules for axes (cylinders), pressure control modules, synchronization control modules, etc.

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Example modules Control electronics for proportional valves

There are many ways to control hydraulic proportional valves. You can find further information on control electronics and application examples in our news section.

Digital setpoint control

These assemblies are used to control proportional valves or electronic modules and amplifiers to control and regulate them. It offers a wide range of options for signal and setpoint generation, editing and processing

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Speed control

These modules can be used to control the speed in various applications. The output signal directly controls the solenoids of any valves without OBE. Typical applications are speed controls with pulse generators, e.g. for generators.

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Pressure control

These devices can be used to regulate the pressure in a wide variety of applications.

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Synchronization and pressure limitation control

WEST synchronization and pressure relief module

These assemblies are used to control hydraulic positioning drives in synchronization with several axes. The controller structure is adapted to the typical requirements, the synchronization controller is superimposed on the position controller. A profile generator is integrated for speed-controlled applications. Control is via CAN bus using a coupling module. The output signal is available either as a voltage or current signal. Parameterization is carried out via a USB interface. A tool optimized for our devices (WPC-300) is available for download free of charge.

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Synchronization control

These assemblies are used to control hydraulic synchronization systems. For this purpose, two actual positions are read in and compared and the deviation is regulated via a proportional valve arranged in the bypass. The controller structure is adapted to the typical requirements. The output signal is available either as a voltage or current signal.

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Power amplifier

These modules can be used to control proportional valves with one or two solenoids. It is mounted directly on the valve. Typical applications are the current-regulated control of throttle and pressure valves or other inductive loads.

Power amplifiers, valve amplifiers or also known colloquially as chopper amplifiers (from the English chop = to chop) are used to control hydraulic proportional valves.

The power amplifier outputs a pulse-width modulated DC voltage (PWM) and thus enables fine control of the proportional valve.

They are available in both analog (setting via potentiometer) and digital versions (setting via PC interface or various fieldbus interfaces). Typical input signals are 0… 10V and 4…20mA, other versions are available on request. The standard PWM frequency is 140 Hz or can be set individually.

The I min, I max and ramp time can be set very precisely using multi-turn potentiometers or various interfaces. The following designs are available: Amplifier plug for placement directly on the prop. solenoid, snap-on power amplifier for mounting on the top-hat rail (other types on request).

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PID control

This module is used for the general control of proportional lines. The controller structure is designed as a classic PID controller with optional feedforward control. This enables bypass control, in which the setpoint signal is fed directly to the output and the controller therefore only has to compensate for linearity errors. The output signal is available either as a voltage or current signal. Parameterization is carried out via a USB interface. A tool optimized for our devices (WPC-300) is available for download free of charge.

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Positioning control

These assemblies can be used to position hydraulic drives. This can be done using the simple and robust point-to-point method (SDD) or speed-controlled (NC), additionally also in synchronization. Typical applications are general positioning drives, fast transport drives, handling systems, speed-controlled axes as well as copying controls and synchronization controls where a Profibus connection is required.

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Position and pressure control

These assemblies can be used to position hydraulic drives. This can be done using the simple and robust point-to-point method (SDD) or speed-controlled (NC). Alternatively, this device can be used to regulate the pressure in a wide variety of applications, or both in combination as a detachable control. It is also possible to operate several devices/axes in synchronization.

Typical applications include general positioning drives, fast transport drives, handling axes, forming machines with position and pressure control as well as feed drives where synchronization of several axes and a Profinet connection are required.

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Pump control

These assemblies are used for volume flow control and pressure (limiting) control of hydraulic axes. The controller structure is designed as a classic p/Q control concept and optimized for typical applications.

The two sensor inputs enable differential pressure/force measurement. The output signal is available either as a voltage or current signal. Parameterization is carried out via a USB interface. A tool optimized for our devices (WPC-300) is available for download free of charge.

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