Cm-et Lodestar User Manual download pdf (Page 19)

TROUBLE SHOOTING

All Hoists

Table 8.

TROUBLE PROBABLE CAUSE CHECK AND REMEDY

1. Hook does not respond

to the control station or

control device

A.) No voltage at hoist-main line or

branch circuit switch open; branch

line fuse blown or circuit breaker

tripped.

A.) Close switch, replace fuse or reset

breaker.

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.

B.) Check for electical continuity and repair or

replace defective part.

C.) Upper or lower limit switch has opened

the control circuit.

C.) Press the “other” control and the hook

should respond. Adjust limit switches as

described on page 12.

D.) Open control circuit-open or shorted

winding in transformer, reversing contactor

coil or loose connection or broken wire in

circuit;mechanical binding in contactor

control station contacts not closing or

opening.

D.) Check electrical continuity and repair or

replace defective part.

E.) Wrong voltage or frequency.. E.) Use the voltage and frequency indicated on

hoist identification plate.

For three phase dual voltage unit, make

sure the connections at the voltage change

board are the proper voltage as

described on page 5.

F.) Low Voltage. F.) Correct low voltage condition as described

on page 5.

G.) Brake not releasing-open or shorted coil

winding; armature binding.

G.) Check electrical continutiy 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 adjustment as

described on page 11.

H.) Excessive load. H.) Reduce loading to the capacity limit of hoist

as indicated on the identifcation plate.

2.) Hook moves in wrong

direction.

A.) Phase reversal (three phase unit only). A.) Refer to installation instruction on page 8.

3.) Hook lowers but will not

raise.

A.) Excessive load. A.) See item 1H.

B.) Open hoisting circuit-open or shorted

winding in reversing contactor coil loose

connection or broken wire in circuit; control

station contacts not making; upper limit

switch contacts open.

B.) Check electrical continuity and repair or

replace defective part. Check operation of

limit switch as described on page 10.

C.) Phase failure (three phase unit only). C.) See item 1B.

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Cm-et Lodestar User Manual Page 19

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