Parker PQDXXA-Z10 - Troubleshooting and Document Information; Trouble Shooting Guide; Pump Flow and Motor Issues

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Digital Pump Control Module
Series PQDXXA-Z10
Installation and Setup Manual
Bulletin HY30-3255-INST/UK
Parker Hannifin Manufacturing Germany GmbH & Co. KG
Pump&MotorDivisionEurope
Chemnitz, Germany
9. Trouble shooting guide
Pump delivers no output flow
Drive motor does not turn
reason
solution
Motor is not connected correctly or one of the three phases has failed.
Motor does not turn smoothly when pump is disconnected from pump.
Check motor connections, check electrical power supply.
reason
solution
Pump is mechanically blocked. Motor turns smoothly when disconnected from pump.
Send pump for service to factory.
Drive motor only turns at slow speed
reason
solution
Motor is not selected properly. Installed motor has not enough torque.
Start pump at unloaded system. Use motor with more horse power.
reason
solution
Pump is hydraulically blocked. No function of compensator, no pressure relief valve;
Pump stops after e few turns.
Check function of pump compensator (see below). Start pump at unloaded system.
Drive motor turns, pump does not turn
reason
solution
Coupling is not or not correctly mounted.
Check coupling assembly and correct it.
Drive motor turns and pump turns
reason
solution
Wrong direction of rotation.
Change direction of motor rotation.
reason
solution
Fluidreservoiremptyornotlledtolevel,suctionlineendsaboveuidlevel.
Fille reservoir to required level, if necessary increase suction pipe length.
reason
solution
Suction line is blocked. E. g. by plugs, cleaning tissues, plastic-plugs.
Ballvalveinthesuctionlineclosed.Suctionlterblocked.
Check suction line for free flow. Open valves in suction line.
Valves should be equipped with electrical indicator. Check suction filter.
reason
solution
Suction line not gas tight, pump gets air into suction port.
Seal suction line against air ingression.
reason
solution
Pressure line / system is not able to bleed air out.
Unload pressure port, unload system before start, bleed air from pressure line.
Pump does not build up pressure, but delivers full flow at low pressure
reason
solution
Standard pressure compensator is set to minimum pressure.
Adjust compensator setting to desired pressure.
reason
solution
No pressure pilot valve connected to port P
R
.
Install suitable pressure pilot valve and adjust it to the desired setting.
reason
solution
Multiple pressure pilot selector valve is not energized; Pump works in stand-by.
Energize selector valve solenoid.
reason
solution
Differentialpressureatcompensatorisadjustedproperly(toolow).
Checkdifferentialpressureadjustmentandcorrectitasdescribedabove.