Pvem, Pvea, Pveh, Pves Electrical Actuators; Troubleshooting Considerations - Danfoss PVG 32 Service Manual

Service Manual
PVG 32 Proportional Valve Group
PVG 32 Component Troubleshooting

PVEM, PVEA, PVEH, PVES electrical actuators

Troubleshooting Considerations

Troubleshooting
Failure mode
Does not work in either direction
LED is green
Does not work in either direction
LED is off
LED is flashing Red
Works in one direction (Assuming
that the manual control lever and
the main spool move freely both
directions)
Works intermittently (if LED is
green it indicates a long on/off
Works with no command from
controller
38 | © Danfoss | February 2017
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.
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 ambient temperature range is rated at -40 to 90 °C. 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 PVG32 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
No control voltage from the electrical controller
Lack of voltage to actuator (Minimum voltage 11
volts for 12 volt system and 22 volts for 24 volt
system)
Electrical actuator is defective
Loose connection between the electrical actuator and
controller
Electrical actuator is defective
Short in wiring harness
Short in wiring harness
Electrical actuator position feed back out of
adjustment
Fine particulate contamination
Corrective action
Check voltage from the electrical controller (25% to 75% of
supply)
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
Ensure voltage from the electrical controller exists for that
direction
Check system voltage
Replace electrical actuator per spec. on the valve
Repair connector
Replace electrical actuator per spec. on the valve
Repair wiring harness
Repair wiring harness
Replace the electrical actuator per valve spec.
Replace PVE or electric actuator per valve specs.
11039167 | AX00000031en-US0301