Troubleshooting And Remedial Action - Pacific Hoists U-MEGA Series Operations Manual & Parts List

7.2 Troubleshooting and Remedial Action

SITUATION
Hoist will not
operate
Hoist will not stop
Brake slips
Hoist runs but does
not lift
Abnormal sound on
load chain/chain
sprocket (2 falls)
Electric shock
Oil leak
CAUSE
(1) Broken/disconnected
power or control circuit
wire.
(2) Low supply voltage
(3) Motor hums but does not
rotate
(4) Emergency stop button
release pushed
(5) Faulty contactor
Welded contacts in contactor Replace contactor
Abrasion of motor brake
(1) Clutch slipping
(1) Chain dry
(2) Worn chain sprocket (2
falls)
(1) Poor earth connection
(2) Accumulated foreign
matter/ moisture on
electrical parts
(1) No oil plug
(2) Loose fitting of oil plug
(3) No plug packing
(4) Worn or deteriorated
Locate and repair/reconnect
Check if 10% reduction in voltage, have main
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
Replace
Contact your authorized PACIFIC dealer –
this adjustment needs to be carried out on a
test rig
Lubricate
Replace load chain and chain sprocket
(2 falls)
Provide correct earth connection
Remove foreign matter/dry electrical parts
Attach the normal oil plug
Fasten the plug tightly
Attach normal packing
Attach the new packing
22
REMEDY