Version 1.0
39
Troubleshooting
39
7.1. During Operation:
Symptoms
Main Cause
Correction
Hoist does not operate
Brake is
inaudible
Contactor is
inaudible
Excessive voltage
Power
Operating circuit break-off, electric parts over
-
heating
Power supply
Internal wiring
Contactor
Transformer
Up/Down limit switch
Button switch
Contactor is audible Power circuit break-off, overheating motor, brake
Motor
Brake
Internal wiring
Contactor (junction fusing)
Brake is audible
Drive overheating, broken bearing
Gear
Bearing
Operates without load only
Unable to lift (motor roar)
Default phase (single phase operation)
Power
Feed power
Motor
Contactor (junction fusing)
Slow lifting
Low voltage
Feed power
Unintended reaction
from button
Inverse reaction from button
Wrong phase sequence wiring
Feed power
Incorrect signal wiring
Internal wiring
Button switch
No reaction after pressing
button
Circuit wire break
Internal wiring
Button switch
Electric installation parts
Contactor
Up/Down limit switch
Contactor
Brake
Feed power
Internal wiring
Button switch
Load chain
Load pulley, bare pulley
Gear
Bearing
Noise of
brake
Running (grating)
Drag
Brake
Stop
Wear of friction plate
Brake
Abnormal noise of rail curve
(grating)
Obstruction of orbit/wheel
Operation of trolley
V.07.22 [LA]
Summary of Contents for PWJTHF
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Page 19: ...Version 1 0 19 Specifications 19 V 07 22 LA...
Page 20: ...Version 1 0 Specifications 20 20 V 07 22 LA...
Page 33: ...Version 1 0 33 Parts 33 1 4 Trolley assembly drawing V 07 22 LA...
Page 49: ...49 Wiring Diagram 49 7 CONVENTIONAL HOIST WIRING DIAGRAM PWJTHF PWJTHT V 07 22 LA...