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TROUBLESHOOTING
Table 11. Troubleshooting
Trouble
1. Hook does not respond to the control
station or control device.
2. Hook moves in 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.
VARIABLE SPEED ELECTRIC CHAIN HOIST WITH
OPTION
Probable Cause
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. The upper or lower limits have stopped the hoist
motion.
D. Wrong voltage or frequency.
E. Low voltage.
F. Brake not releasing - open or shorted coil
winding; armature binding.
G. Excessive load.
H. Signal connections have unplugged from brake
board.
A. Wiring connections reversed at the control
station.
B. Reversal of motor leads.
A. Excessive load.
B. Open hoisting circuit - open; control station
contacts faulty; upper limit position has been
reached.
C. Phase failure.
A. Open hoisting circuit - open; control station
contacts faulty; upper limit position has been
reached.
A. Phase failure.
B. Phase reversal.
A. Brake slipping.
B. Excessive load.
35
Remedy
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 page 19.
D. Use the voltage and frequency indicated on hoist
identification plate.
E. Correct low voltage condition as described on page 11.
F. Check electrical continuity and connections. Check that
correct coil has been installed. Check brake adjustment
as described on page 18.
G. Reduce loading to the capacity limit of hoist as indicated
on the identification plate.
H. Firmly press the 6- and 13-pin connection plugs into
board. Limits have to be cleared and reset if hoist moves
without encoder input. Verify safe limit operation before
proceeding.
A. Check connections with the wiring diagram.
B. Refer to installation instructions 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 12.
C. See item 1B.
A. Check electrical continuity and repair or replace defective
part. Check operation of limit switch as described on
page 12.
A. See item 1B.
B. Refer to installation instructions on page 11.
A. Check brake adjustment as described on page 18.
B. See item 1H.
P/N: 192047082 (REV AD) 627NH March 2022
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