− 50 −
Situation Cause Explanation Remedy
Moves in the reverse
direction.
Reversed connection.
Connect correctly two lead wires of three
wires for power supply.
See 5.3 "Trial run".
Won't move.
(1) Blown power circuit fuse or the power circuit
breaker is switched off.
(2) Blown control circuit fuse.
(3) Disconnection of power cable or;
disconnection of push button cord
(5) Voltage drop
(6) The emergency stop button was pushed.
(7) Trouble in the internal wiring (loose contact,
disconnection)
(8) Damaged contact in electromagnetic
contactor
Replace the fuse. Check current rating is correct.
Replace the fuse or reset the breaker switch as
necessary.
Replace the fuse. Check current rating is correct
and replace fuse as necessary/
Check for disconnection in cable or cord which
are subjected to frequent bending, and repair
disconnected point.
Check voltage with a tester, and check
connecting condition at the power source.
Turn the emergency stop button to the right to
release.
Check internal wiring and repair where
necessary.
Replace the electromagnetic contactor.
If motor hums and does not rotate, stop operation
immediately.
Won't stop.
Welded contacts in electromagnetic contactor
Replace the electromagnetic contactor.
Brake slips.
Abrasion of motor brake
Check and repair the motor brake.
Load fails to rise.
(1) Trouble with the friction clutch
(2) voltage drop
Contact KITO or an authorized KITO dealer.
Check voltage with a tester, and check
connecting condition at the power source.
If motor hums and does not rotate, stop operation
immediately.
Abnormal sound come from
load chain
(1) Trouble with the friction clutch
(2) Worn load sheave
Supply oil to load chin.
Replace the load sheave.
Wear limit for chain link diameter at the gearing
part of chain is 10%.
Total wear limit for every 5 links pitch is 3%.
The trolley does not stop
immediately
Loose trolley motor brake
Check and repair the motor brake.
Keep braking time to less than 1 second.
The trolley wheels slip.
(1) Tilted rail
(2) Excessive oil on tread of
traversing rail
Check and correct rail tilting.
Wipe off oil.
Slightly grease the tread for
better result.
Electric shock
(1) Improper grounding work
(2) Accumulated foreign matter or moisture
on electric parts
Provide correct grounding.
Remove foreign matters or dry whole
electric parts completely.
Ground equipment according to local laws. The
traversing rail may serve as a grounding conductor when
four conductors cable is not used for power supply to the
motorized trolley. Be sure to ground the rail in this case.
Oil leak
(1) No oil plug
(2) Loose fitting or oil plug
(3) No plug packing
(4) Worn or deteriorated oil packing
Attach the normal oil plug.
Fasten the plug tightly.
Attach normal packing.
Replace with new packing.
8. TROUBLESHOOTING
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