11
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
Digital Inputs
Enable
A positive voltage higher than 10 V (and < 30 V) at
PIN 8 enables the solenoid current driver circuit of
the module. The operation of the module requires
a permanent signal on PIN 8 (e.g. supply voltage).
Disconnecting the enable signal or a signal level
below 2.5 V will immediately switch off the solenoid
current. Ramp settings will not apply.
The enable function is not a safety function
to avoid unwanted operation of the machine
in terms of machine safety regulations.
Enable p/Q-control
A positive signal > 10 V (and < 30 V) at PIN 7 ena-
bles the pressure control function of the module.
A signal lower than 2.5 V at PIN 7 will allow the
module to perform the displacement control of the
pump only. The p-valve solenoid current is set to
maximum.Theamplierforthepressurevalveis
deactivated at TYPE F (no function with mounted
p-Q block)
Enable ramp
A positive signal > 10 V (and < 30 V) at PIN 5
enables the internal ramp generator. The module
offers an individual ramp-up and ramp-down func-
tion for displacement and pressure command. This
ramp function allows ramp settings up to 60 s. A
signal lower than 2.5 V at PIN 5 will disable the
ramp generation.
Ramp function should be used for lasting
system stability.
Analog Inputs
Displacement command signal input
The displacement command is connected to
PIN 10.
Please note: all input commands as well as all
output signals are referenced to the modules
0 V level at PIN 9, 11 and 31.
A +10 V input command at PIN 10 brings the
pump to full displacement, when module settings
and pump size are matched and if no electronic
limitation is entered into the parameters. A 0 V
input command at PIN 10 brings the pump to dead
head (0 l/min output flow), when the pressure at
the pump outlet is 20 bar or higher.
With the MAX setting for the displacement com-
mand (Parameter: MAX:WQ), a smaller displace-
ment than the nominal pump displacement at +10
V input command can be adjusted. A minimum
displacement at 0 V command signal can be set
with the parameter MIN:WQ.
If the hydraulic system is not able to maintain
a pump outlet pressure of 20 bar at pump
dead head, a pre-load valve must be installed
at the pumps outlet to maintain controllability
of the pump displacement.
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.
For correct signal levels, see the technical
date section.
It is recommended to use shielded cables
with a cross section of at least 0.5 mm² for
the input command lines to avoid interfer-
ence with power lines or other sources for
electromagnetic„noise“.
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