R&M Materials Handling ELECTRIC CHAIN HOISTS LoadMate Chain Hoist LM 5 - Manual (Page 64)

LM05 SERIES II I&M MANUAL/EN/11.30.2010
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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