8 Trouble diagnosis and countermeasures
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30
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8 Trouble diagnosis and
countermeasures
During motor running, the motor and driver may not operate correctly due to speed
setting error or connection error. If normal motor operation cannot be ensured, see
the following description and take appropriate countermeasures. If normal operation
cannot be ensured even after that, please contact your local sales office.
Phenomenon Estimated
cause
Measure
Either START/STOP input
or RUN/BRAKE input is not
set to the L level.
Make sure that both START/STOP
input or RUN/BRAKE input are set
to the L level.
The internal potentiometer
is not adjusted.
Turn the internal potentiometer
slightly in the clockwise direction.
The speed is set to 0 r/min at time
of shipment.
When the internal
potentiometer is used,
INT.VR/EXT input is not set
to the L level.
Set the INT.VR/EXT input to the L
level. When the INT.VR/EXT input
is set to the L level, the internal
potentiometer is selected.
The external potentiometer
contact is faulty.
Check for connection of the
external potentiometer.
When the external
potentiometer is used,
INT.VR/EXT input is not set
to the H level.
Set the INT.VR/EXT input to the H
level. When the INT.VR/EXT input
is set to the H level, the external
potentiometer is selected.
The external DC voltage
contact is faulty.
Check for connection of the
external DC voltage.
The motor fails
to turn.
When an external DC
voltage is used,
INT.VR/EXT input is not set
to the H level.
Set the INT.VR/EXT input to the H
level. When the INT.VR/EXT input
is set to the H level, external DC
voltage is selected.
•
The motor
fails to turn.
•
The motor
stops halfway.
Protection function has
activated.
Count the LED flashings. See page
26 and check the causes in
conformity to the activated
protection function. Take the
appropriate measures.
