TROUBLESHOOTING
This section provides basic troubleshooting information. Specific causes to problems are best identified by thorough inspections performed by personnel instructed in safety,
operation and maintenance of this equipment. The chart below provides a brief guide to common hoist symptoms, probable causes and remedies.
Symptom
Cause
Remedy
Hoist will not operate.
No electrical supply to hoist.
Check electrical system connections, cords and fuses.
Hoist is overloaded.
Reduce load to within rated capacity.
Emergency Stop engaged.
Disengage Emergency Stop button.
Transformer damaged.
Check power supply is within ± 10% range. Replace
transformer if damaged.
Load continues to move when hoist is stopped.
Brake is slipping.
Check brake has a gap of 0.7 mm. Check brake discs are
clean. Refer to Dwg. MHP3333 on page 7.
Hoist is overloaded.
Reduce load to within rated capacity.
Hoist does not lift load.
Motor may be damaged.
Remove motor. Examine all parts and replace any that are
worn or damaged.
Insufficient electrical supply.
Verify electrical voltage, phase, voltage drop and
amperes under load/no load conditions
Slip clutch incorrectly adjusted.
Replace or adjust slip clutch assembly.
Hoist runs in opposite direction of Control Pendant
operation.
Power cables (L1 and L2 ) are incorrectly located (cross
phased).
Reverse the two power cables (L1 and L2 ).
Control Pendant is operated but hoist does not operate.
Control Pendant may be damaged.
Check Control Pendant for signs of damage. Refer to
section“INSPECTION” on page 2 .
Motor may be damaged.
It is not recommended to disassemble the motor.
Examine motor for external damage, Contact Factory or
distributor for replacement.
No electrical supply to hoist.
Check electrical system connections, cords, fuses and
circuit breaker.
Hoist runs slowly.
Improper electrical supply.
Verify electrical voltage, phase, voltage drop and
amperes under load/no-load conditions.
Oily or sticking brake discs.
Disassemble, clean and dry discs.
Motor may be damaged.
Remove and disassemble motor as described in the
section“MAINTENANCE” on page 6 . Examine all parts
and replace any that are worn or damaged.
Motor hums or lifting speed is slow.
Oily or sticking brake discs.
Disassemble, clean and dry brake discs.
Brake disc tabs may be binding in brake cage.
Check brake discs slide freely in brake cage.
Electrical leak.
Poor grounding (earth).
Correctly ground (earth) power supply. Check wiring for
broken wires.
Foreign material or moisture on electrical connectors.
Dry or remove all foreign material accumulated on
electrical parts.
Short in power supply system.
Check all switches, connections and circuit breakers in
power supply line for damaged insulation or contact with
hoist frame.
Hoist lowers but will not lift.
Limit switch may be stuck.
Check limit switch movement.
Contactor coil damages.
Replace contactor.
Hoist does not stop at the end of load chain travel.
Limit stop not working or being activated.
On multi reeved hoists, check load chain is not twisted or
capsized. Check limit switch operation.
Form 16586737 Edition 4
5
Summary of Contents for QCH100
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