Troubleshooting - Yale HOISTS SHAW-BOX YKA Operation & Service Manual

9

Troubleshooting

9 Troubleshooting
Trouble
Hoist does NOT operate
Hoist does NOT operate,
motor hums
Hoist does NOT start after a
longer shutdown, or starts with
difficulty,
motor hums.
Hoist motor overheats
Hoist operates intermittently
Braking distance is too long
152
Electric shock hazard.
➢ Make sure an electrical qualified person performs the work.
➢ Disconnect power and implement a Lockout/Tagout (LOTO) procedure before
servicing the equipment.
Possible cause
No power to hoist
Wrong voltage
Loose or broken wire connections
Contactor not functioning
No control voltage
Motor burned out
Not all power phases are present
Hoist brake stuck
Excessive load
Excessive duty cycle
Wrong voltage or frequency
Defective motor or worn bearings in hoist
frame
Collectors make poor contact
Loose contacts
Brake lining worn
DANGER
Remedy
1. Check switches, and fuses.
2. Check connections in power supply lines.
3. Check power collectors.
1. Check if the supply voltage is in accordance with the
voltage indicated on motor data plate.
1. Shut off the power.
2. Remove electrical cover, and check wire connections.
3. Check wire connections of control pendant.
4. Check wire connections of limit switches.
5. Correct wiring 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. Replace contactor if necessary.
1. Check if transformer fuse is blown.
2. If fuse is burn, check control pendant for grounding
and/or shorts.
3. Check transformer coil for signs of overheating.
4. Check if the transformer secondary is the same voltage
as the coils to which it is connected.
5. Replace transformer if necessary.
1. Replace motor.
2. Check input power supply.
3. Check hoist motor connections.
1. Check fuses, replace if necessary
2. Check input power supply.
3. Check control pendant.
1. Check brake.
2. Replace brake if necessary.
1. Reduce load to rated load of hoist, as shown on
nameplate.
1. Reduce frequency of lifts.
2. Reduce amount of jogging.
1. Check if the supply voltage is in accordance with the
voltage indicated on motor data plate.
2. Check hoist and inspect for defective, worn or
damaged parts.
1. Disassemble hoist.
2. Inspect for defective, worn or damaged parts.
3. Replace parts if necessary.
1. Check electrical connections.
2. Check collectors for free movement of spring arms, or
weak springs.
1. Check wire connections.
2. Correct wiring if necessary.
1. Replace brake disk.
07.2020