CM Lodestar A - Two-Speed Hoist Operation Issues

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00001996 (REV AC) 627NH October 2014
TROUBLE SHOOTING ALL HOISTS TABLE 7
TROUBLE PROBABLE CASE REMEDY
Two Speed Hoists
11.) Hoist will not operate at slow
speed in either direction.
A.) Open Circuit. A.) Open or shorted motor winding, loose
or broken wire in circuit, speed selecting
contactor stuck in opposite speed mode.
Replace motor, repair wire and/or replace
speed selecting contactor.
B.) Phase Failure. B.) See item 1B.
12.) Hoist will not operate at fast
speed in either direction.
A.) Open Circuit. A.) See Item 11A.
B.) Open speed selecting circuit. 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 selector; repair connection, replace
contactor or control station.
C.) Phase Failure. C.) See Item 1B.
13.) Hook will not raise at slow
speed.
A.) Excessive load. A.) See item 1H.
B.) Phase Failure. B.) See Item 1B.
C.) Open Circuit. C.) See item 11A.
D.) Brake not releasing. D.) See Item 1G.
14.) Hook will not lower at slow
speed.
A.) Phase Failure. A.) See item 1B.
B.) Open Circuit. B.) See item 11A.
C.) Brake not releasing. C.) See Item 1G.
15.) Hook will not raise at fast
speed.
A.) Excessive load. A.) See item 1H.
B.) Phase Failure. B.) See Item 1B.
C.) Brake not releasing. C.) See Item 1G.
16.) Hook will not lower at fast
speed.
A.) Phase Failure. A.) See Item 1B.
B.) Brake not releasing. B.) See Item 1G.
17.) Hook moves in proper
direction at one speed,
wrong direction at other
speed.
A.) Phase reversal. A.) Wiring reconnected improperly.
Interchange two leads of motor winding
that is out of phase at the speed selecting
relay.