Harrington Hoists and Cranes ED-DA Hoist - (ED3) - Manual (Page 35)

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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 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.
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.
Faulty magnetic
contactor Check coil for open or short circuit. Check all connections in the
control circuit. Check for open contacts. Replace as needed.
Motor burned out
Replace motor frame/stator, shaft/rotor, and any other damaged
parts.
Fuses burned out Replace fuses.
Brush wear
Inspect both motor brushes per Table 5-4 and replace if
necessary.
Hoist lifts but will not
lower
Down circuit open
Check circuit for loose connections. Check down side of limit
switch for malfunction.
Broken conductor in
pendant cord Check the continuity for each conductor in the cable. If one is
broken, replace entire cable.
Faulty magnetic
contactors Check coils for open or short circuit. Check all connections on
motor circuit. Check for burned contacts. Replace as needed.
Faulty switch in
pendant Check electrical continuity. Check electrical connections.
Replace or repair as needed.