19
10001921 REV AC
July 2019
TABLE 9. TROUBLESHOOTING CHART
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
1.) Hook does not respond to the
control station or control device
A.) No voltage at hoist-main line or branch
circuit switch open; branch line fuse
blown or circuit breaker tripped.
A.) Close switch, replace fuse or reset breaker.
B.) Phase failure (single phasing, three
phase unit only)-open circuit, grounded
or faulty connection in one line of supply
system, hoist wiring, reversing contactor,
motor leads or windings.
B.) Check for electrical continuity and repair or
replace defective part.
C.) Upper or lower limit switch has opened
the control circuit.
C.) Press the “other” control and the hook should
respond. Adjust limit switches as described
on page 15.
D.) 1. Open control circuit-open
2. Shorted winding in transformer
3. Reversing contactor coil
4. Loose connection
5. Broken wire in circuit
6. Mechanical binding in contactor
7. Control station contacts not closing
or opening.
D.) Check electrical continuity and repair or replace
defective part.
E.) Wrong voltage or frequency.
E.) Use the voltage and frequency indicated on
hoist identification plate. For three phase dual
voltage unit, make sure the connections at the
voltage change board or PCB are the proper
voltage as described on page 8.
F.) Low Voltage.
F.) Correct low voltage condition as described
on page 9.
G.) Brake not releasing-open or shorted coil
winding; armature binding.
G.) Check electrical continuity and connections.
Check that correct coil has been installed. The
coil for three phase dual voltage unit operates
at 230 volts when the hoist is connected for
either 230 volt or 460 volt operation. Check
brake adjustment as described on page 15.
H.) Excessive load. Mechanical load
protector slipping.
H.) Reduce loading to the capacity limit of hoist
as indicated on the identification plate.
2.) Hook moves in wrong direction.
A.) Phase reversal (three phase unit only).
A.) Refer to installation instruction on page 8.
3.) Hook lowers but will not raise.
A.) Excessive load. Mechanical load
protector slipping.
A.) See item 1H.
B.) Open hoisting circuit-open or shorted
winding in reversing contactor coil loose
connection or broken wire in circuit;
control station contacts not making;
upper limit switch contacts open.
B.) Check electrical continuity and repair or replace
defective part. Check operation of limit switch
as described on page 9.
C.) Phase failure (three phase unit only).
C.) See item 1B.
4.) Hook raises but will not lower
A.) Open lowering circuit-open or shorted
winding in reversing contactor coil, loose
connection or broken wire in circuit;
control station contacts not making;
lower limit switch contacts open.
A.) Check electrical continuity and repair or replace
defective part. Check operation of limit switch
as described on page 9.
5.) Hook lowers when hoisting control
is operated.
A.) Phase failure (three phase unit only).
A.) See item 1B.
B.) Phase reversal (three phase unit only).
B.) Refer to installation instruction on page 8.
