Hydraulic (Remote) Pilot Control Pressure - Danfoss PVG 32 Service Manual

Service Manual
PVG 32 Proportional Valve Group
System Troubleshooting
Cause
Incorrect signal voltage
Solenoid valve faulty PVHC
Insufficient pilot supply
Main spool position feedback
transducer signal incorrect
Incorrect PVE connections

Hydraulic (remote) pilot control pressure

Cause
Insufficient pilot pressure
Insufficient pilot oil supply
Air in pilot line
Pilot lines incorrectly sized
Hydraulic remote pilot operator
faulty
© Danfoss | February 2017
Check
Check voltage levels at solenoid plug
Proportional operation - Refer to
Udc: Supply voltage (100%)
Us: Supply signal voltage (25-50-75%)
Ground: Live or ground connection
On-Off Operation
Udc: Supply voltage if selected
Us: Supply voltage if selected
Ground: Live or ground connection
Check coil resistance
Check pilot pressure - 10-15 bar [145-218 psi]/PVHC 25 bar [360
psi]
Test oil for contamination and or water content
Check that the proportional remote electrical controller has not
been connected to an ON-OFF PVEO solenoid
Check
Check pilot oil pressure 5-15 bar [72-220 psi] delta between A and
B port on remote
PVG32: 5-15 Bar [72-217 PSI]
Check pilot oil flow rate is adequate
Pilot flow should be 1.0 L/min [0.264 GPM] per section
Check pilot lines for blockage
Check for trapped air in pilot lines
Check pressure drop
Check operation of hydraulic remote pilot controller
Check supply pressure to hydraulic remote controller - minimum
25 bar [360 psi]
Check and inspect movement of pressure control valve in
hydraulic controller
Check operation of remote hydraulic controller
Troubleshooting Considerations
Corrective action
Check data for resistance
Replace
If oil contamination is too high, flush hydraulic
system or replace oil if necessary. If problem
persists change PVE
Connect wires correctly
Corrective action
Remove blockage
Bleed air from pilot lines at PVH
Check and reduce length or pilot lines
Increase diameter of pilot lines
Use steel tube for long pilot line runs
Repair or replace
Repair or replace
Repair per manufacturers procedure, or
replace
Clean and/or repair as necessary
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