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8.4.5 OVERWINDING PREVENTION DEVICE
• Make sure that you contact us or our sales service agency for the actions marked with
in the table.
• Ask us or our sales service agency for repair if you suspect any other abnormalities or
causes than those given below.
When no operation stops in an overwinding state
Abnormal Phenomenon Major cause(s) Remedy
When extending or hoisting
operation is performed, the
operation does not stop even in
an overwinding state although
the buzzer sounds.
Short circuit of emergency
power supply circuit
Inspection and
replacement of solenoid
valve
Defective overwinding cancel
switch
Inspection and
replacement of
overwinding cancel switch
Defective ground Replacement of ground
When extending or hoisting
operation is performed, the
buzzer does not sound and the
operation does not stop either
even in an overwinding state.
Defective overwinding
detector
Inspection and
replacement of
overwinding detector
When extension or hoisting does not operate even when not in an overwinding state
Abnormal Phenomenon Major cause(s) Remedy
When extending or hoisting
operation is performed, the
buzzer sounds and the operation
is not performed even when not
in an overwinding state.
Defective overwinding
detector
Inspection and
replacement of
overwinding detector
Damage or entanglement of
overwinding detecting wire
Inspection, repair and
replacement of
overwinding detecting wire
Damage of overwinding
detecting weight
Inspection and
replacement of
overwinding detecting
weight
Defective wiring between
controller and overwinding
detector
Inspection, repair or
replacement of wiring
between controller and
When extending or hoisting
operation is performed, the
operation is not performed even
when not in an overwinding state.
However, the buzzer does not
sound.
Defective solenoid valve coil
or spool
Disassembly repair or
replacement of solenoid
Defective wiring between
controller and solenoid valve
replacement of wiring
between controller and
solenoid valve
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