LM05 SERIES II I&M MANUAL/EN/11.30.2010
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Copyright © (2010) R&M Materials Handling, Inc. All rights reserved.
8.5 Troubleshooting
Table 15. Troubleshooting
PROBLEM
POSSIBLE CAUSE
POSSIBLE SOLUTION
Hoist does not lift or lower load
Emergency stop button is activated
Deactivate button
Blown fuse
Replace the fuse
Motor thermal protection activated
Allow motor to cool down
Pendant plug pin pushed out
Reinstall plug pin
Contactor terminal screws loose
Tighten screws
Mainline switch shut off
Turn switch on
Hoist does not lift load
Overload condition
Reduce load
Slip clutch worn or incorrectly adjusted
Replace wear items or readjust slip
clutch torque
Brake not releasing
Check brake coil resistance.
Check air gap setting. Adjust if
necessary.
Check rectifier output voltage.
Load drifts more than 4 inches [100mm]
Brake lining worn
Air gap on brake is too wide
Replace wear items as necessary
Adjust air gap setting
Travel direction does not correspond to
that indicated on push button
Power supply incorrectly connected
See SECTION 3
Abnormal noises while lifting or lowering
Load chain and its components are not
lubricated
Clean and lubricate load chain.
Load chain is worn
Replace chain
Chain wheel or chain guide is worn
Replace chain wheel or chain guide
Idler sprocket is worn
Replace idler sprocket
A supply phase is missing
Connect the three phases
Twist or kink in load chain
Remove twist or kink
