Characteristics - W.E.ST. SCU-138-P Technical Documentation Manual

2 Characteristics

This module was developed for controlling a universal closed loop control system for speed and velocity con-
trol. A power amplifier for proportional valves is integrated. Various parameter settings allow an optimal adap-
tation to the corresponding 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 is received by an analogue input signal (range 0... 10V or 4... 20mA). Alternatively the
setpoint can be defined by an internal parameter (e.g. for generator speed control). Another possibility is the
use of a PWM modulated signal for the transmittal of the command value.
Ramp function and PID controller can be used universally. The output current is closed loop controlled and
therefore independent from the supply voltage and a varying solenoid resistance. The output stage is moni-
tored (short circuit / broken wire) and switches off in case of detected error.
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: Speed control using an impulse sensor.
Features

Universal speed control unit

Compact housing

Digital reproducible adjustments

Free scaling of the analogue command input

Alternatively scalable PWM command input

Universal PID controller

Controlling of proportional valves with one or two solenoids

Direct connection of pulse transmitter

Free parameterization of ramps, MIN and MAX, DITHER (frequency and amplitude) and
PWM frequency of the solenoid output

Output current up to 2.6 A

Adaptable to all standard proportional valves

Application orientated parameter settings

Fault diagnosis and extended function checking

Parameterization via USB interface with WPC-300 software
Page 7 of 34 SCU-138-P-2230 05.06.2020