22
TROUBLE
PROBABLE CAUSE
CHECK AND REMEDY
11. Hoist will not oper-
ate at slow speed in
either direction.
12. Hoist will not oper-
ate at fast speed in
either direction.
13. Hook will not raise
at slow speed.
14. Hook will not lower
at slow speed.
15. Hook will not raise
at fast speed.
16. Hook will not lower
at fast speed.
17. Hook moves in
proper direction at
one speed—wrong
direction at other
speed.
A) Open Circuit.
B) Phase failure.
A) Open circuit.
B) Open speed selection circuit.
C) Phase failure.
A) Excessive load.
B)
Phase failure.
C) Open circuit.
D) Brake not releasing.
A) Phase failure.
B) Open circuit.
C) Brake not releasing.
A) Excessive load.
B) Phase failure.
C) Brake not releasing.
A) Phase reversal.
B) Brake not releasing.
A) Phase reversal.
A) Open or shorted motor wind-
ing, loose or broken wire in
circuit, speed selecting contac-
tor stuck in opposite speed
mode. Replace motor, repair
wire and/or replace speed
selecting contactor.
B) See Item 1B.
A) See Item 11A.
B) Open or shorted winding in
speed selecting contactor coil.
Loose connection or broken
wire in circuit. Mechanical
binding in contactor. Control
station contacts not making or
opening. Replace speed selecting
contactor; repair connection,
replace contactor or control
station.
C) See Item 1B.
A) See Item 1H.
B) See Item 1B.
C) See Item 11A.
D) See Item 1G.
A) See Item 1B.
B) See Item 11A.
C) See Item 1G.
A) See Item 1H.
B) See Item 1B.
C) See Item 1G.
A) See Item 1B.
B) See Item 1G.
A) Wiring reconnected improperly.
Interchange two leads of
motor winding that are out of
phase at the speed selecting
contactor.
TWO SPEED HOISTS
