CM LODESTAR 635 Serie Manuel D'entretien, D'opération Et De Pièces page 22

TABLE 7. TROUBLESHOOTING CHART
Symptom
1. Hook does not respond to the control
station
2.) Hook moves in the wrong direction.
3.) Hook lowers but will not raise.
4.) Hook raises but will not lower.
5.) Hook lowers when hoisting
control is operated.
6.) Hook does not stop promptly.
7.) Hoist operates sluggishly.
Possible Cause(s)
A.) No voltage at hoist-main line or branch circuit switch open;
branch line fuse blown or circuit breaker tripped.
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.
C.) Upper or lower limit switch has opened the motor circuit.
D.) Open control circuit-open or shorted winding in transformer,
reversing contactor coil or speed selecting relay coil; loose
connection or broken wire in circuit; mechanical binding in
contactor or relay; control station contacts not closing or opening.
E.) Wrong voltage or frequency..
F.) Low Voltage.
G.) Brake not releasing-open or shorted coil winding; armature binding. G.) Check electrical continuity and connections.
H.) Excessive load.
A.) Wiring connections reversed at either the control station or
terminal board (single phase unit only).
B.) Failure of the motor reversing switch to effect dynamic braking
at time of reversal (single phase unit only).
C.) Phase reversal (three phase unit only).
A.) Excessive load.
B.) Open hoisting circuit-open or shorted winding in reversing
contactor coil or speed selecting relay coil; loose connection
or broken wire in circuit; control station contacts not making;
upper limit switch contacts open.
C.) Phase failure (three phase unit only).
A.) Open lowering circuit-open or shorted winding in reversing
contactor coil or speed selecting relay coil; loose connection
or broken wire in circuit; control station contacts not making;
lower limit switch contacts open.
B.) Motor reversing switch not operating (single phase unit only).
A.) Phase failure (three phase unit only).
A.) Brake slipping.
B.) Excessive load.
A.) Excessive load.
B.) Low voltage.
C.) Phase failure or unbalanced current in the phases
(three phase unit only).
D.) Brake dragging.
(ENGLISH)
A.) Close switch, replace fuse or reset breaker.
B.) Check for electrical continuity and repair or
replace defective part.
C.) Press the "other" control and the hook should
respond. Adjust limit switches as described on
pages 17-18.
D.) Check electrical continuity and repair or replace
defective part.
E.) Use the voltage and frequency indicated on hoist
identification plate. For three phase dual voltage
unit, make sure the connections at the voltage
conversion board are the proper voltage as
described on page 8.
F.) Correct low voltage condition as described on page 9.
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 16.
H.) Reduce loading to the capacity limit of hoist as
indicated on the identification plate.
A.) Check connections with the wiring diagram.
B.) Check connections to switch. Replace a damaged
switch or a faulty capacitor.
C.) Refer to installation instruction on page 8.
A.) See item 1H.
B.) Check electrical continuity and repair or replace
defective part. Check operation of limit switch as
described on page 10.
C.) See item 1B.
A.) Check electrical continuity and repair or replace
defective part. Check operation of limit switch as
described on page 10.
B.) See items 2B and 3C.
A.) See item 1B.
A.) Check brake adjustment as described on page 16.
B.) See item 1H.
A.) See item 1H.
B.) Correct low voltage condition as described on page 9.
C.) See item 1B.
D.) Check brake adjustment as described on page 16.
20
Corrective Action
P/N: 83874 (REV. 627-T) September 2016