36
P/N: 192047082 (REV AD) 627NH
March 2022
VARIABLE SPEED ELECTRIC CHAIN HOIST WITH
OPTION
Trouble
Probable Cause
Remedy
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 18.
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. When ambient temperature is above 104°F (40°C), 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 18.
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 19.
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 18.
