Parker PV Series - 9.3 Basic adjustment control valves; Figure 18: Proportional p-Q-control

19
Parker Hannifin Manufacturing Germany GmbH & Co. KG
Pump & Motor Division Europe
Chemnitz, Germany
Electro hydraulic proportional controls version 45 for
axial piston pumps, PV series
Bulletin MSG30-3254-INST/UK
Installation and setup manual
If the actual value gets 10V before the pump is full
stroked, the LVDT parameter need to be reset.
If the actual value is below 10V and the pump is
already full stroked, the LVDT parameter need
to be reset as well.
9.3 Basic adjustment control valves
See also Installation and Start-Up Manual
for the digital control module PQDXXA-Z10.
Caution: the proportional displacement con-
trol, code ...FDV (old: FPV) does not include
a pressure compensation. Therefore the
hydraulic circuit needs to be protected with
a pressure relief valve (safety valve). This
valve has to be layed out for full pump flow.
The remote pressure compensation stage of
the p-Q-controls codes ...UDR, ...UDK, ...UDM,
...UDS, ...UDP und ...UDF (old: ...UPR, ...UPK,
...UPM, ...UPS, ... UPQ, ...UPP and UPF), refered
chapters 2 to 7, is adjusted as follows.
Dierential pressure adjustment
Lock nut
The factory setting for the dierential pressure
is 15 ± 1 bar. For re-adjustment two pressure
gages / transducers are required. The dier-
ential pressure to be adjusted is the dierence
between the two pressures on both sides of
the control spool of the pressure compensator
stage in a control situation. For compensator
codes ...UDP and UDF (old: UPP and UPF) this
is the dierence between the pressure p
F
on
the sensing side and the pilot pressure p
R
(see
figure 12).
For all other codes it is the dierence between
pump outlet pressure p
1
and pilot pressure p
R
.
The leads to a minimum compensation pres-
sure of 15 bar at completely unloaded spring
chamber.
Figure 18: Proportional p-Q-control