Parker PQDXXA-Z10 - Page 26

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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
PL:EXT (horse power mode):
INT The setting in PL:PL is getting active as horse power limitation.
EXT The horse power control gets dynamic by an analog 0...10 V Signal at PIN 29 while the
setting at PL:PL gets 100% (maximum value) for the scaling.
The horse power control is only active if a pressure sensor is installed.
PL:RPM (Rotational speed setting):
Setting of the pumps or drive motors rotational speed respectively.
The parameter is used for the calculation of the maximum input power.
PL:T1 (Setting of the horse power controls delay element):
Setting the horse power controls delay element. The time between signal input and signal processing
ofthehorsepowercontrolledsubsystemcanbemodiedwiththatparameter.
This parameter should be changed only if the controlled system tends to have instabilities due to
high dynamic challenges.
When the module is operated in horse power control mode under certain conditions and at fast
pressure rise rates the power limiter may act too slowly and the horse power requirements exceed
the limits briefly.