Electrical Supply - Danfoss PVG 100 Service Manual

Service Manual
System Troubleshooting
Cause
Leaking or burst supply hose
Relief valve malfunction
Isolating valves are closed
Faulty pump control
Low standby pressure in PVP - open center pump Check idle standby pressure - 10 Bar [145 PSI]
Low standby pressure in pump control - variable
pump
PVP pressure relief valve faulty
PVP orifices blocked
Internal filters blocked
Supply lines blocked
Internal hydraulic pilot pressure insufficient
Blocked LS galleries
Shuttle valves faulty

Electrical Supply

Cause
No electrical power
Neutral position switch faulty
Incorrect signal voltage
Solenoid valve faulty PVHC
Insufficient pilot supply
PVG 100 Proportional Valves
Check
Inspect lines to valve stack
Check for contamination and operation of relief
valve
Check that all isolating valves are open and clear
Check pump compensator for correct operation
and setting per pump manufacturers
Check condition of compensator spool spring
Check pump LS control for operation and setting
Stand by pressure should be 15 bar [220 psi]
minimum
Check pressure relief valve spool and spring for
freedom of operation
Check PVP orifices for blockage
Check for blockage in internal filters
Inspect supply lines for blockages
Inspect pilot oil pressure reducing valve for
proper operation
Check LS galleries for blockage
Check LS system shuttle valves for wear and
damage
Check for contamination per specification HPP 030. Refer to Design Guideline for Hydraulic Fluid
Cleanliness, Technical Information Manual 520L0467. If fluid is out of specification, flush hydraulic
system and fill with clean filtered oil.
Check
Check electrical circuit
Verify emergency stop switch is in the proper
operating position
Check operation of neutral position switch in
remote controller (if connected in circuit) PVRE/
PVRES/PVREL
Check voltage levels at solenoid plug
Proportional operation
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]
11048807 • Rev BA • October 2014
Corrective action
Repair or replace damaged hose
Repair or replace relief valve
Repair or replace pump compensator per pump
manufacturers recommendations
Replace
Replace module due to worn components
Repair or replace LS control per pump
manufacturers procedures
Replace
Remove blockage
Remove blockage
Remove blockage
Repair or replace
Clean blockage from LS galleries
Replace as needed
Corrective action
Repair as needed
Reset
Replace switch
Check data for resistance
Replace
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