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7.5 Malfunctions and solutions
Malfunction
Winch will not
operate
Hook travel in wrong
direction.
Hook will pull/raise
but will not release /
lower.
Hook will release /
lower pull/raise but
will not pull/raise.
Winch will not lift
rated load.
Winch motor
overheats
Lack of proper lifting
speed
Cause
Power failure
Wrong voltage or
frequency
Improper connection in
winch or push button
Motor brake does not
release
Faulty magnetic winch
control switch.
Three phase reversal.
Improper connections.
Lower electrical circuit
open.
Contactor assembly not
Down, push button
inoperative.
Overload.
Winch electrical circuit
open.
Contactor assembly not
functioning
Down, push button
inoperative.
Low voltage.
Overload.
Excessive duty-cycle.
Wrong voltage or
frequency.
Defective motor or worn
bearings in winch frame.
Brake not adjusted
properly.
Excessive load.
Low voltage.
Solution
Check circuits breakers, switches and connection
in power supply line.
Check voltage and frequency of power supply
against the rating on the name plate.
Check all connections at line connectors and
terminal block.
Check connections to the brake coil. Check for
open or short circuit. Check for burned contacts.
Check coils for open or short circuit. Check all
connections in control circuit. Check for burned
contacts.
Reverse any two wires (except green ground wire)
at the power source.
Check all connections against wiring diagram.
Check for loose connections. See that necessary
jumper wires are properly installed on contactor.
See that necessary jumper wires are properly
installed. Verify that the contactor armatures are
free to move. If binding occurs, replace contactor.
Check for burned out contactor coils.
Check push button contacts and wires.
Reduce loading to rated load of winch, as shown
on nameplate
Check for loose connections. See that necessary
jumper wires are properly installed on contactor.
See that necessary jumper wires are properly
installed. Verify that the contactor armatures are
free to move. If binding occurs, replace contactor.
Check for burned out contactor coils.
Check push button contacts and wires.
See that power supply current is the same voltage
Iisted on motor data plate. Check winch motor
connections. Check size of power supply lines.
Reduce loading to rated load as shown on
nameplate.
Reduce frequency of lifts or amount of jogging.
Check current rating on motor data plate against
power supply. Check einch and inspect for
defective, worn or damaged parts.
Disassemble winch and inspect for defective, worn
or damaged parts.
Adjust brake
Reduce loading to rated load as shown on
nameplate.
Bring up voltage to plus or minus 10% of voltage
specified on winch. Line voltage should be
measured while winch is lifting load
18
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