Harrington Hoists and Cranes (N)ER Hoist - ((N)ER1) - Manual (Page 37)

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Table 7-1 Troubleshooting Guide
Symptom Cause Remedy
Motor or brake
overheating
Excessive load Reduce load to within rated capacity of hoist.
Excessive duty cycle Reduce frequency of lifts.
Wrong voltage or
frequency Check voltage and frequency of power supply against the rating
on the nameplate on the motor.
Brake drags Check brake adjustment for proper clearance.
Extreme external
heating
Above an ambient temperature of 140°F, the frequency of hoist
operation must be reduced to avoid overheating of the motor.
Special provisions should be made to ventilate the hoist or
otherwise shield it from the heat.
Hoist operates
intermittently
Collectors making poor
contact Check movement of spring loaded arm, weak spring, connections,
and shoe. Replace as needed.
Contactor contacts
arcing
Check for burned contacts. Replace as needed.
Loose connection in
circuit Check all wires and terminals for bad connections. Replace as
needed.
Broken conductor in
Pendant Cord Check for intermittent continuity in each conductor the Pendant
Cord. Replace entire Pendant Cord if continuity is not constant.