Danfoss PVG 32 Service Manual page 7

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Service
Manual
PVG
32
Proportional
Valve Group
System
Troubleshooting
Hydraulic (remote) pilot control
pressure
Cause Check
Corrective
action
lncorrect signal voltage
Check voltage
levels
at solenoid
plug
Proportional operation -
Refer
to
Troubleshooting
Considerations
Udc: Supply voltage (1007o)
Us:
Suppfy
si
gnal
voltag
e
(25-50-7
5o/ol
Ground:
Live or
ground connection
On-Off Operation
Udc: 5upply voltage
if
selected
Us:
Supply voltage
if selected
Ground: Live or
ground connection
Solenoid valve faulty
PVHC Check
coil resistance
Check
data for
resistance
Insufficient
pilot supply
Check
pilot pressure
-
10-15 bar
[145-218
psi]/PVHC 25 bar [360
psil
Replace
Main spool
position
feedback
transducer signal incorrect
Test
oil for contamination
and or water content
lf
oilcontamination
is
too
high, flush hydraulic
system or replace oil if
necessary.
lf problem
persists change
PVE
lncorrect
PVE
connections
Check that
the proportional
remote electrical controller
has
not
been
connected to
an ON-OFF
PVEO
solenoid
Connect wires correctly
Cause.,, Check
Corrective action
Insufficient pilot pressure
Check
pilot oil
pressure 5-15 bar
t72-22O
psil delta between
A and
B
port on
remote
PVG32:5-15
Bar 172-217 PSll
Insufficient
pilot oil supply
Check
pilot
oilflow
rate
is
adequate
Pilotflowshould
be
1.0
L/min
[0.264 GPM]
persection
Check
pilot
lines for blockage
Remove blockage
Air in
pilot line
Check for
trapped
air
in
pilot
lines
Bleed air
from pilot
lines
at
PVH
Pilot lines incorrectly
sized Check pressure drop
Check
and reduce length
or
pilot
lines
Increase diameter of
pilot
lines
Use
steel tube for
long
pilot
line runs
Hydraulic remote pilot operator
faulty
Check operation of hydraulic remote
pilot controller
Repair or replace
Check supply pressure to
hydraulic remote controller- minimum
25 bar
[360
psi]
Repair
or replace
Check
and inspect movement of pressure
control valve in
hydraulic controller
Repair
per manufacturers procedure,
or
replace
Check
operaticin of remote hydraulic
controller
Clean
and/or repair
as
necessary
1
I O39l 67
.
Rev
BA
. May
201
4