HOIST
OPERATION & MAINTENANCE
15
P/N: 11854801 REV. AC
September 2017
TROUBLESHOOTING
LOAD DRIFTS OR DROPS
Possible Cause
Remedy
Motor brake slipping*
Adjust brake. Check for oil on brake discs.
Motor brake not closing*
Adjust for proper clearance.
See brake instructions.
* With vector control, the inverter will fault and warning horn will sound in the
event of any brake related issues. If these conditions are observed (Brake slip
or failure to set), see the hoist inverter manual to troubleshoot inverter related
brake faults and the brake manual for proper adjustment of brake.
BRAKE COIL BURNED OUT
Possible Cause
Remedy
Wrong coil
Replace with proper voltage coil.
Motor brake too tight
Adjust brake. See brake instructions.
HOIST DOES NOT OPERATE
Possible Cause
Remedy
Blown or loose fuse
Replace or tighten fuse
Tripped breaker
Reset breaker
Lose terminal screws
Check and tighten all loose screws
Low voltage
Check voltage at line side of mainline
contactor (when provided) or line side of
hoist fuse base
Low voltage or no voltage
to push button circuit
Check voltage at output side of transformer.
Wrong voltage tap may have been selected.
For example: 460 volt tap used when line
voltage is 230 volt. Check control circuit fuse.
Defective push button
Check contact points at push button to see if
points touch. If not, replace.
Defective push button cord.
(Wire may be pinched,
broken or bare.)
Check for lack of continuity or short to ground.
Motor brake coil burned
Replace. Check to make sure coil is proper
coil for voltage applied.
Defective stator
Rewind stator
Rotor loose on shaft
Replace
MOTOR OVERHEATS, EXCESSIVE
AMPERAGE DRAW
Possible Cause
Remedy
Defective stator
Replace or rewind stator
Worn motor bearings
Replace
Bent rotor shaft
Replace
Rotor dragging in stator
Tighten motor bolts. Check for foreign matter
between rotor and stator. Check for worn
motor bearings.
Stator loose in frame
Rewind stator if necessary.
Reposition and anchor in accordance with
motor manufacturers instructions.
Low voltage
Check with local utility company and/or
increase wire size.
MOTOR NOISY
Possible Cause
Remedy
Motor bolts loose
Tighten
Rotor dragging in stator
Check for bent rotor shaft or worn bearings.
Replace worn or damaged parts.
Motor bearings loose
Replace bearings
TRANSFORMER OVERHEATS OR BURNS OUT
Possible Cause
Remedy
Wrong tap used
on primary side
Replace transformer if necessary.
Primary tap must match line voltage.
Shorted transformer
Replace
Shorted control circuit
Correct short
HOIST SHOCKS OPERATOR
Possible Cause
Remedy
Hoist not grounded
Ground hoist
Power leads or control wires
shorted to hoist frame.
Repair or replace
Grounded motor
Replace
Slight electrical leakage
from any of the electrical
components on hoist.
Make sure hoist is properly grounded.
Содержание Lodeking LT Series
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