Specifications

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7.2 Troubleshooting and Remedial action
SITUATION CAUSE REMEDY
Hoist will not
operate
(1) Phase error relay operated
due to incorrect phase
connections
(2) Blown power fuse or
tripped power circuit
breaker
(3) Blown control circuit fuse
(4) Broken/disconnected power
or control circuit wire
(5) Low supply voltage
(6) Motor hums but does not
rotate
(7) Emergency stop button
release pushed (if fitted)
(8) Faulty contactor
Reverse any two phase connections
Check supply requirements and refuse/reset breaker
to meet requirements
Check fuse for correct rating and replace
Locate and repair/reconnect
Check if 10% reduction in voltage, have mains
supply checked
Check phases to motor - insulate and repair
Check the cause as necessary
Operate manually if hoist runs then control
circuit/coil is faulty - locate fault and repair. If hoist
does not run then check main supply. If input
supply is correct but there is a faulty output supply
then replace the contactor
Hoist will not stop Welded contacts in contactor Replace contactor
Brake slips Abrasion of motor brake Replace
Abnormal sound.
on load chain/
chain sprocket
(1) Chain dry
(2) Worn chain sprocket
Lubricate
Replace load chain and chain sprocket
Electric shock (1) Poor earth connection
(2) Accumulated foreign matter/
moisture on electrical parts
Provide correct earth connection
Remove foreign matter/dry electrical parts
Oil leak (1) No oil plug
(2) Loose fitting of oil plug
(3) No plug packing
(4) Worn or deteriorated oil
packing
Attach the normal oil plug
Fasten the plug tightly
Attach normal packing
Attach the new packing