The PQP-179-P hydraulic control unit is a highly flexible pump control module for open and closed circuits. In addition to control of the swivel angle, pressure, and flow rate, it offers an optionally activatable spool position controller for the control valve. It is specifically optimized for pumps using control valves with electrical feedback of the spool position for maximum dynamics and accuracy.

The unit is designed for installation within a shielded EMC enclosure (control cabinet) and mounts onto a standard DIN rail. It has an IP20 protection rating.

The hardware provides scalable analog inputs for swashplate angle, pressure, and spool position, supporting 0-10V or 4-20mA signals as well as LVDT measurements. The integrated PWM power output stage controls solenoids with up to 2.6A, and alternatively, an analog control signal for OBE valves can be output.

Key parameters include the PID settings for the cascaded controllers governing pressure (CP), swivel angle (CQ), and spool position (CV), as well as mechanical cylinder specifications for internal force calculation. Nominal current (CURRENT) and dither parameters (DAMPL/DFREQ) are critical for configuring the output stage.

Parameterization is performed PC-based using the WPC software via the integrated USB interface.

Standout features include a master-slave function for the synchronized control of pumps connected in parallel, as well as support for closed-loop circuit operation. The module also enables the direct connection of LVDT displacement measurement systems via the optional LDT-401 assembly and offers advanced process monitoring, including the display of the calculated hydraulic force.