Harrington Hoists RHN02D-20A-20D Series, Owner'S Manual

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7.0 Troubleshooting

HAZARDOUS VOLTAGES ARE PRESENT IN THE HOIST AND IN CONNECTIONS BETWEEN
COMPONENTS.
Before performing ANY troubleshooting on the equipment, de-energize the supply of electricity to the equipment,
and lock and tag the supply device in the de-energized position. Refer to ANSI Z244.1, “Personnel Protection -
Lockout/Tagout of Energy Sources.”
Only Trained and competent personnel should inspect and repair this equipment.
Table 7-1 Troubleshooting Guide
Symptom Cause Remedy
Hoist and/or Trolley
moving in wrong
direction
Power supply reversed
phased Switch two (2) of the three (3) power supply cord wires at the
power source.
Improper electrical
connections
Refer to wiring diagram and check all connections.
Hoist and/or Trolley will
not operate
Loss of power
Check circuit breakers, switches, fuses and connections on power
lines/cable.
Wrong voltage or
frequency Check voltage and frequency of power supply against the rating
on the nameplate of the motor.
Hoist overload Reduce load to within rated capacity of hoist.
Motor overheated and
thermal overload
protector has tripped
See Trouble Shooting Problem "Motor or brake overheating".
Improper, loose, or
broken wire in hoist
electrical system
Shut off power supply, check wiring connections on hoist control
panel and inside push-button pendant.
Brake does not
release
Check motor brake adjustment for proper clearance.
Defect in control
transformer Check transformer coil for signs of overheating. Disconnect
transformer and check for open winding.
Faulty magnetic
contactor Check coil for open or short circuit. Check all connections in the
control circuit. Check for open contactors. Replace as needed.
Faulty Up or Down
Limit Switch
Replace the Up and/or Down Limit Switch
Motor burned out
Replace motor frame/stator, shaft/rotor, and any other damaged
parts.