
12
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
Pressure command signal input
The pressure command is connected to PIN 13.
A +10 V input command brings the pump to the
nominal pump pressure (350 bar for PV series
pumps), if the pressure compensator differential
setting is set in the module software and the pilot
valve is the recommended type PVACRE***K35
( * represents the mounting bolt options, thread
options and the sealing options). A 0 V input com-
mand brings the pump to minimum compensating
pressure (typical differential pressure + ca. 5 bar).
The relation between input command and compen-
sating pressure is linearized for the pressure control
(open loop, TYPE=P). With a pressure transducer
installed in the pilot circuit (at the pressure pilot
valve PVAC***K35), the compensating pressure
is closed loop monitored (TYPE=Q).
With the MAX setting for the pressure command
(Parameter MAX:WP), a smaller pressure at +10 V
inputcommandcanbeadjusted.
To enable the pump to control pressures up
to 350 bar the displacement command
has to be at least 15%.
To prevent malfunction and erratic control
response, a high signal quality is recom-
mended. The command signal needs to be
lteredandmustbefreeofinductivesurges
and modulations.
Incorrect signal levels will lead to erratic
control function and may damage the unit.
Please see the section technical data.
Horse power command signal input
The horse power command is connected to PIN 29.
A +10 V input command allows the pump to operate
within its full power range (nominal displacement
resp. flow, 350 bar output pressure). If the module
is programmed for electronic horse power limitation
(Parameter: PL:EXT = EXT), a reduced input com-
mand at PIN 29 will result in a limitation of the pump
output flow, if the maximum power is exceeded.
The maximum pump driving power is calculated
and stored internally in the module. The overall
pumpefciencyisconsideredinthiscalculation.A
second maximum or limit can be set with the power
limitation parameter (PL:PL), which can be less or
equal to the calculated value.
If the external power limitation is deactivated
(Parameter: PL:EXT = INT), the power limitation
parameterdenedin(Parameter:PL:PL)actsas
boundary (only if a pressure sensor is installed).
This will keep the horse power requirement of the
pump below the commanded level.
A +5 V input command signal will limit the
horse power requirement for the pump to
50% of the full nominal horse power ( i. e.
for PV028 the full corner horse power at
1,500 rpm is approx. 29,0 kW, at +5 V input
command at PIN 29 the pump input power is
limited to 14.5 kW).
Only for a constant input speed this control
maintains a certain horse power level. For
variable speed, only the max. input torque
level is controlled.
If the power limitation is active, both LED
STATUS I and STATUS II are on. The power
limitation is also shown at the monitor view
(Status Info – POWER_LIM).