Yale HOISTS SHAW-BOX YKA Operation & Service Manual page 153

9 Troubleshooting
Trouble
Loud clicking noise when motor
starts
Lifting of rated load NOT
possible
Hook moves in wrong direction
Lifting NOT possible
Lowering NOT possible
Hook block and rope are rotating Rope twisted
Hoist does NOT follow the
control commands
Cross traveling NOT possible
Load drifts excessively when
hoist is stopped
07.2020
Possible cause
Air gap on brake is too wide
Low voltage
Hoist wired incorrectly
Upper hook position is reached
Excessive load
Limit switch defective
Condition monitoring device
(SMC.., SLE..) is activated or is defective
UP button inoperative
Contactor assembly not functioning
Hoist electrical circuit open
Bottom hook position is reached
Limit switch faulty
DOWN button inoperative
Contactor assembly not functioning
Lower electrical circuit open
Condition monitoring device error
Excessive load
Travel limit switch defective
Fuses defective
Excessive load
Remedy
1. Measure air gap on motor.
2. Replace brake disk if the maximum air gap is reached.
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.
1. Check wiring connections with appropriate wiring
diagram.
2. Correct wiring if necessary.
1. Activate DOWN button
2. Reduce load to rated load of hoist, as shown on
nameplate
1. Check operational hoist limit switch.
2. Check emergency hoist limit switch.
3. Replace limit switch if necessary.
1. Check supplied manual of the condition monitoring
device (SMC.., SLE..)
1. Check button contacts and wires.
2. Correct wiring or repair control pendant if necessary.
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.
1. Check if connections are loose.
2. Check if jumper wires on contactor are properly
installed.
3. Correct wiring if necessary.
1. Activate UP button
1. Check operational hoist limit switch.
2. Check emergency hoist limit switch.
3. Replace limit switch if necessary.
1. Check button contacts and wires.
2. Correct wiring or repair control pendant if necessary.
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.
1. Check if connections are loose.
2. Check if jumper wires on contactor are properly
installed.
3. Correct wiring if necessary.
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.
1. Check supplied manual of the condition monitoring
device (SMC.., SLE..)
1. Reduce load to rated load of hoist, as shown on
nameplate.
1. Check travel limit switch, replace if necessary
1. Check fuses, replace if necessary
1. Reduce load to rated load of hoist, as shown on
nameplate.
153