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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).
Page 10 of 34
PQP-171-P
05.06.2020
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