R&M Materials Handling ELECTRIC CHAIN HOISTS LoadMate Chain Hoist LM 10 Stepless - Manual (Page 74)

LM10 STEPLESS I&M MANUAL/EN/11.30.2010
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8.5 Troubleshooting
Table 22. Troubleshooting
PROBLEM POSSIBLE CAUSE POSSIBLE SOLUTION
Hoist does not lift or lower load
Inverter problem See technical documentation
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 2
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
m
WARNING: High voltages inside the frequency converter. Wait for at least five minutes after
the supply voltage has been switched off before service actions. The display in the operating
condition (lights on) indicates a dangerous voltage on the DC-bus. When display turns off, the
DC-bus voltage is approximately 100V. Note also that there is always a dangerous voltage in
the braking resistor when the DC-bus is charged.