Lodestar CM Hoist, Operating Manual

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21
T Ta ab blle e 7 7 ((c co on n’’tt))
Two Speed Hoist
TROUBLE PROBABLE CAUSE CHECK AND REMEDY
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 contac-
tor. 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.