CM Lodestar A, Operating, Maintenance & Parts Manual

Page: 26 / 128

26
00001996 (REV AC) 627NH October 2014
TROUBLE SHOOTING ALL HOISTS TABLE 7
TROUBLE PROBABLE CASE REMEDY
3.) Hook lowers but will not raise. A.) Excessive load. 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 16.
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 15-16.
B.) Motor reversing switch not
operating (single phase unit only).
B.) See items 2B and 3C.
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
14.
6.) Hook does not stop promptly. A.) Brake slipping. A.) Check brake adjustment as described on
page 22.
B.) Excessive load. B.) See item 1H.
7.) Hoist operates sluggishly. A.) Excessive load. A.) See item 1H.
B.) Low voltage. B.) Correct low voltage condition as
described on page 15.
C.) Phase failure or unbalanced current
in the phases (three phase unit
only).
C.) See item 1B.
D.) Brake dragging. D.) Check brake adjustment as described on
page 22.