User Manual

P/N: 192047082 (REV AA) 627NH January 2018
34
TABLE 12. TROUBLESHOOTING
TROUBLE PROBABLE CASE REMEDY
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.) The upper or lower limits have
stopped the hoist motion.
C.) Press the “other” control and the hook
should respond. Adjust limit switches as
described on page 18.
D.) Wrong voltage or frequency. D.) Use the voltage and frequency indicated
on hoist identication plate.
E.) Low Voltage. E.) Correct low voltage condition as
described on page 11.
F.) Brake not releasing-open or shorted
coil winding; armature binding.
F.) Check electrical continuity and
connections. Check that correct coil has
been installed. Check brake adjustment as
described on page 17.
G.) Excessive load. G.) Reduce loading to the capacity limit of
hoist as indicated on the identication
plate.
H.) Signal connections have unplugged
from Brake Board.
H.) Firmly press the 6 and 13 pin connection
plugs into board. Limits have to be
cleared and reset if hoist moved without
encoder input. Verify safe limit operation
before proceeding.
2.) Hook moves in wrong
direction.
A.) Wiring connections reversed at the
control station.
A.) Check connections with the wiring
diagram.
B.) Reversal of motor leads. B.) Refer to installation instructions on page
8.
3.) Hook lowers but will not raise. A.) Excessive load. A.) See item 1H.
B.) Open hoisting circuit-open; control
station contacts not making; upper
limit position has been reached.
B.) Check electrical continuity and repair or
replace defective part. Check operation of
limit switch as described on page 12.
C.) Phase failure. C.) See item 1B.
4.) Hook raises but will not lower. A.) Open hoisting circuit-open; control
station contacts not making; upper
limit position has been reached.
A.) Check electrical continuity and repair or
replace defective part. Check operation of
limit switch as described on page 12.
5.) Hook lowers when hoisting
control is operated.
A.) Phase failure. A.) See item 1B.
B.) Phase reversal. B.) Refer to installation instruction on page 11.