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8.
TROUBLESHOOTING
Table 8-7 Troubleshooting Guide
Symptom
Cause
Loss of power
Check circuit breakers, switches, fuses and connections on power lines/cable.
Check voltage and frequency of power supply against the rating on the name-
Wrong voltage or
frequency
plate of the motor.
Hoist overload
Reduce load to within rated capacity of the hoist
Hoist will not
Improper, loose or broken
Shut off the power supply, check wiring connections on the hoist control panel
operate
wire in the hoist electrical
and inside push button pendant.
system
Brush wear
Inspect both motor brushes per Table 8-2 and replace if necessary.
Fuses burned out
Replace fuses.
Motor burned out
Replace the motor frame/stator, shaft/rotor, and any other damaged parts.
Check electrical continuity. Check electrical connections. Replace or repair as
Faulty switch in pendant
needed.
Hoist lifts but will
not lower
Check the continuity for each conductor in the cable. If one is broken, replace
A broken conductor in
pendant cord
the entire cable.
Hoist overload
Reduce load to within rated capacity of the hoist.
Repair by a qualified person trained in the repair of hoists and proper friction
Worn friction clutch
clutch adjustment procedures. Replace as needed.
Check the continuity for each conductor in the cable. If one is broken, replace
Broken conductor in
pendant cord
the entire cable.
Hoist lowers but
will not lift
Check electrical continuity. Check electrical connections. Replace or repair as
Faulty switch in pendant
needed.
Determine the cause of low voltage and bring to within plus or minus 5% of the
Low voltage in hoist's
voltage specified on the motor nameplate. The voltage should be measured at
power supply
the hoist contactor.
Hoist overload
Reduce load to within rated capacity.
Determine cause of low voltage and bring to within plus or minus 5% of the
Low voltage in hoist's
Hoist will not
voltage specified on the motor nameplate. The voltage should be measured at
power supply
lift rated load or
the hoist contactor.
does not have
the proper lifting
If abnormal operation or slippage occurs do NOT attempt to disassemble or
speed
adjust the Mechanical Load Brake with Friction Clutch. Replace the worn or
Faulty friction clutch
malfunctioning Mechanical Load Brake with Friction Clutch as an assembly with
a new, factory adjusted part.
Motor demagnetizing is generally caused by using the hoist beyond its duty
Load drifts exces-
Motor demagnetized
rating. Replace stator assembly and reduce usage to comply with the duty
sively when the
rating stated.
hoist is stopped
Improper gear oil
Replace oil with the correct gear oil.
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Remedy
Tabel 8-7 Troubleshooting Guide
Symptom
Cause
Loose connection in the
Check all wires and terminals for bad connections. Replace as needed.
circuit
Check the movement of spring-loaded arm, weak spring, connections, and
Collectors making poor
Hoist operates
contact
intermittently
shoe. Replace as needed.
Check for intermittent continuity in each conductor in the pendant cord.
Broken conductor in
pendant cord
Replace the entire pendant cord if continuity is not constant.
Remedy
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