Pveh, Pves, Electrical Actuators; Troubleshooting Considerations - Danfoss PVG 100 Service Manual

Service Manual
PVG 100 Component Troubleshooting
Failure mode
Internal leakage

PVEH, PVES, Electrical Actuators

Failure mode
Does not work in either direction LED is green
Does not work in either direction LED is off
LED is flashing Red
36
PVG 100 Proportional Valves
Location: In the PVB
Function: Low leakage on the work ports
Cause
Component wear
Contamination
Description: Proportional electrical actuator.
Location: On the end of the main spool of the PVB.
Function: Convert an electrical command to move the main spool to a set position.

Troubleshooting Considerations

Wiring Check: It is highly possible that in the case of one PVE failing that there could be a poor
connection between the joystick and the PVE in question. The PVE is reverse polarity protected and
suppression protected; however an intermittent connection could degrade the input electronics to a
point of failure. Inspect all wiring and connectors for corrosion and or pinch points.
Hirshman Receptacle and Mating Connector: Each PVE is supplied with a field installable 4-pin
Hirshman mating connector and gasket. It is recommended that the gasket be installed between the
mating connector and PVE receptacle also the rubber grommet be sealed around a multi-wire jacket in
order to seal off moisture from the wiring connections. The PVE is rated for IP65 only when the Hirshman
connector is sealed.
Temperature Capability: The PVE is rated for 1000 hours @ 160 °F. ambient temperature. Oil
temperature wise, the area of the valve that creates the highest horsepower loss usually creates the
highest temperature in the system. If one PVE section is operated more frequently than others this would
create more heat than any other part of the valve. Under these conditions it is extremely important to
insure that the hydraulic system is well cooled. Oil temperature measurements at the reservoir and at the
center of the PVG100 valve stack. The valve should be mounted to provide the best ventilation for the
PVE electronics. Poor filtration and low fluid levels may also add to temperature.
Cause
No control voltage from the electrical controller
Command pin wire in mating connector is
broken
Connector corroded - This condition is caused by
water ingression or ground connection
No power from the battery
Power pin wire in mating connector is broken
Connector corroded - This condition is caused by
water ingression or ground connection
Ground connection must be hard wired straight
from the battery or from the electrical controller
Control signal is out of range
11048807 • Rev BA • October 2014
Corrective action
Replace module
Replace module
Corrective action
While under pressure, back out to minimum
pressure and allow oil to leak by for approx. 5
seconds and then readjust to correct pressure -
Replace valve
Repair broken wire
Replace PVE and mating connector
Check power to electrical actuator
Repair broken wire
Replace PVE and mating connector
Repair ground connection
Check wiring harness for short