13
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. Open control circuit – open or shorted winding in transformer or reversing
contactor coil; loose connection or broken wire in circuit; mechanical binding in
contactor; control station contacts not closing or opening
D. Wrong voltage or frequency.
E.
Low voltage.
F.
Brake not releasing – open or shorted coil winding; armature binding.
G. Excessive load.
A.
Close switch, replace fuse or reset breaker.
B.
Correct power supply system. Check for electrical continuity and repair or replace
defective part.
C. Check electrical continuity and repair or replace defective part.
D. Use the voltage and frequency indicated on hoist identification label.
E.
Correct low voltage condition as described on page 7.
F.
Check electrical continuity and connections. Check that correct coil has been
installed. The coil for three phase dual voltage unit operates at 230 volts when the
hoist is connected for either 230 volt or 460 volt operation. Check brake adjust-
ment (page 12).
G. Reduce load to the capacity limit of hoist as indicated on the hoist identification
label.
1.
Hook does not respond to control station.
A.
Wiring connections reversed at the control station.
B.
Failure of the motor cut-out switch to effect dynamic braking at time of reversal
(single-phase units only).
C. Phase reversal (three-phase units only).
A.
Use wiring diagram and check wiring connections.
B.
Check connections to switch. Replace damaged switch or faulty capacitor.
C. Refer to installation instructions page 7.
2.
Hook moves in wrong direction.
A.
Excessive load.
B.
Open hoisting circuit – open or shorted winding in reversing contactor coil; loose
connection or broken wire in circuit; control station contacts are not making.
C. Motor cut-out device not operating. (single-phase units only).
D. Phase failure (three-phase units only).
A.
See item 1G.
B.
Check electrical continuity and repair or replace defective part.
C. Check the switch connections and actuating bar and contact for sticking or dam-
age. Check centrifugal mechanism for loose or damaged components. Replace
defective parts.
D. See item 1B.
3.
Hook lowers but will not raise.
A.
Open lowering circuit – open or shorted winding in reversing contactor coil; loose
connections or broken wire in circuit; control station contacts not making.
B.
Motor cut-out switch not operating (single-phase units only).
A.
Check electrical continuity and repair or replace defective part.
B.
See item 3C.
4.
Hook raises but will not lower.
A.
Phase failure (three-phase units only).
A.
See item 1B.
5.
Hook lowers when hoisting control is operated.
A.
Excessive load.
B.
Low voltage.
C. Phase failure or unbalanced current in phases (three-phase units only).
D. Brake dragging.
A.
See item 1G.
B.
Correct low voltage condition as described on page 7.
C. See item 1B.
D. Check brake adjustment as described on page 12.
7.
Hoist operates sluggishly.
A.
Excessive load.
B.
Low voltage.
C
Extreme external heat.
D. Frequent starting or reversing.
E.
Phase failure or unbalanced current in the phases (three-phase units only).
F.
Brake dragging.
G. Motor cut-out device not opening start winding circuit (single-phase units only).
A.
See item 1G.
B.
Correct low voltage condition as described on page 7.
C. Above an ambient temperature of 104°F (40°C), the frequency of hoist operation
must be limited to avoid overheating the motor. Special provisions should be made
to ventilate the space or shield the hoist from radiant heat.
D Avoid excessive inching, jogging or reversing. This type of operation drastically
shortens the motor and contactor life and causes excessive brake wear.
E.
See item 1B.
F.
Check brake adjustment as described on page 12.
G. See Item 3C.
8.
Motor overheats.
A.
Shaft not rotating.
A.
Check for damaged gears.
9.
Hook fails to stop either or both.
––– Probable Cause –––
––– Remedy–––
TROUBLE SHOOTING
A.
Brake slipping.
B.
Excessive load.
A.
Check brake adjustment as described on page 12.
B.
See item 1G.
6.
Hook does not stop promptly.
