Danfoss 51 Series Service Manual page 11

Service
Manual
Series 51-1 Controls
81,
B,2,B7,EI,EZ,ET,Fl,
F2,
Nl, T7,T2,T7,TA,TH, pZ,
pg
T1,T2,T7,T A,TH
Pressure Compensator
(PC) controls
3.
Start
the prime mover and operate at normal
speed.
4'
Stroke pump very slowly
to gradually
increase
system pressure to the
PC
setting
pressure, or:
a) lower the pump's
multifunction valve (series 90)
or
HPRV
(H1)
below the
pC
setting
b)
stroke
the pump to approximately
1/4 displacement
c) adjust the multifunction
valve (Series
90) or
HPRV
(Ht
)
to
slowly increase system pressure to the
PC
setting
pressure.
5.
Watch
the
gauge at port
M3. When pressure
in M3 begins to
decrease, note the pressure
at
port
M4.
This
is
the
PC
setting.
lf
you don't get the correct
pressure
setting, repeat
step 4 using
a
different
option.
The
result
depends on the application.
PC
setting
M4
To check
or
reset the
pressure compensator
setting
on a test stand:
1. Monitor
system flow.
2.
Increase the system pressure until flow
begins to
increase. System gauge
pressure
at
this
point
is
the
PC
setting.
\
To
adjust
the
pressure compensator
setting:
1.
Use
a 1Omm hex
wrench
to
loosen the
seal locknut.
2.
Using
a
3mm internal hexwrench,
turn the
PC
adjusting
screw clockwise to
increase
the
pressure
setting, counter-clockwise
to
decrease
the
setting.
The pressure
compensator setting
changes at
a
rate of
approximiiety-o
r-ar
taoO
ptif
per
turn
Using a 1Omm hex wrench to
hold the adjustment
screw in place
torque the
seal
locknut to
52 N.m
t38lbf.ftl.
Recheck the pressure
compensator setting and readjust the
as necessary.
3.
4.
1
1009443 .
Rev BA
.
February
201 5