9
Troubleshooting
07.2020
153
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Trouble
Possible cause
Remedy
Loud clicking noise when motor
starts
Air gap on brake is too wide
1.
Measure air gap on motor.
2.
Replace brake disk if the maximum air gap is reached.
Lifting of rated load NOT
possible
Low voltage
1.
Check if the supply voltage is in accordance with the
voltage indicated on motor data plate.
2.
Check hoist motor connections.
3.
Check size of power supply lines.
Hook moves in wrong direction
Hoist wired incorrectly
1.
Check wiring connections with appropriate wiring
diagram.
2.
Correct wiring if necessary.
Lifting NOT possible
Upper hook position is reached
1.
Activate DOWN button
Excessive load
2.
Reduce load to rated load of hoist, as shown on
nameplate
Limit switch defective
1.
Check operational hoist limit switch.
2.
Check emergency hoist limit switch.
3.
Replace limit switch if necessary.
Condition monitoring device
(SMC.., SLE..) is activated or is defective
1.
Check supplied manual of the condition monitoring
device (SMC.., SLE..)
UP button inoperative
1.
Check button contacts and wires.
2.
Correct wiring or repair control pendant if necessary.
Contactor assembly not functioning
1.
Check if jumper wires are properly installed.
2.
Check if contactor armatures move freely.
3.
Check if contactor is burned or welded.
4.
Correct wiring or replace contactor if necessary.
Hoist electrical circuit open
1.
Check if connections are loose.
2.
Check if jumper wires on contactor are properly
installed.
3.
Correct wiring if necessary.
Lowering NOT possible
Bottom hook position is reached
1.
Activate UP button
Limit switch faulty
1.
Check operational hoist limit switch.
2.
Check emergency hoist limit switch.
3.
Replace limit switch if necessary.
DOWN button inoperative
1.
Check button contacts and wires.
2.
Correct wiring or repair control pendant if necessary.
Contactor assembly not functioning
1.
Check if jumper wires are properly installed.
2.
Check if contactor armatures move freely.
3.
Check if contactor is burned or welded.
4.
Correct wiring or replace contactor if necessary.
Lower electrical circuit open
1.
Check if connections are loose.
2.
Check if jumper wires on contactor are properly
installed.
3.
Correct wiring if necessary.
Hook block and rope are rotating
Rope twisted
1.
Turn rope anchorage 1 to 2 times in opposite direction
(360°) to the twisted rope.
2.
Perform several runs without load over the full lifting
height.
3.
If necessary, repeat these steps 2 times.
Hoist does NOT follow the
control commands
Condition monitoring device error
1.
Check supplied manual of the condition monitoring
device (SMC.., SLE..)
Cross traveling NOT possible
Excessive load
1.
Reduce load to rated load of hoist, as shown on
nameplate.
Travel limit switch defective
1.
Check travel limit switch, replace if necessary
Fuses defective
1.
Check fuses, replace if necessary
Load drifts excessively when
hoist is stopped
Excessive load
1.
Reduce load to rated load of hoist, as shown on
nameplate.
