User Manual

P/N: 192047082 (REV AA) 627NH January 2018
35
TABLE 12. TROUBLESHOOTING
TROUBLE PROBABLE CASE REMEDY
6.) Hook does not stop promptly. A.) Brake slipping. A.) Check brake adjustment as described on
page 17.
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 11.
C.) Phase failure or unbalanced current
in the phases.
C.) See item 1B.
D.) Brake dragging. D.) Check brake adjustment as described on
page 17.
8.) Motor overheats. A.) Low voltage. A.) Correct low voltage condition as
described on page 11.
B.) Excessive load. B.) See item 1H.
C.) Extreme external heating. C.) Above an ambient temperature of 40°C.
(104°F.), the frequency of hoist operation
must be limited to avoid overheating of
motor. Special provisions should be made
to ventilate the space or shield the hoist
from radiation.
D.) Frequent starting or reversing. D.) Avoid excessive inching, jogging
or plugging. This type of operation
drastically shortens the motor and
contactor life and causes excessive brake
wear.
E.) Phase failure or unbalanced current
in the phase.
E.) See item 1B.
F.) Brake dragging. F.) Check brake adjustment as described on
page 17.
9.) Hook fails to stop at either or
both ends of travel.
A.) Limit switches not set correctly. A.) Set the hook limits per the procedure on
page 18.
B.) Missing, loose, or
damaged components.
B.) Check for missing, loose and/or
damaged encoder boards, harnesses,
magnetic pinion.
10.) Hook stopping point varies. A.) Missing, loose, or
damaged components.
A.) Check for missing, loose and/or
damaged encoder boards, harnesses,
magnetic pinion.
B.) Brake not holding. B.) Check the brake adjustment as described
on page 17.