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Troubleshooting and remedial actions
9 Troubleshooting and remedial actions
During motor operation, the motor or speed controller may fail to function properly due to an improper
speed setting or wiring. When the motor cannot be operated correctly, refer to the contents provided in
this section and take appropriate action. If the problem persists, contact your nearest office.
Note
Certain items must be checked with the power on. Be careful not to touch any live
connections.
Phenomenon
Possible cause
Remedial action
•
The motor does not operate.
•
The speed doesn't change.
Both the FWD input and REV input
are OFF.
Turn either FWD input or REV input
ON.
Both the FWD input and REV input
are ON.
The internal potentiometer or
external potentiometer is not
adjusted.
The factory setting is 0 r/min. Turn the
potentiometer clockwise.
The INT/EXT input is ON when
using the internal potentiometer.
Turn the INT/EXT input OFF.
The external potentiometer is not
connected correctly.
Check the connection.
The INT/EXT input is OFF when
using the external potentiometer.
Turn the INT/EXT input ON.
The motor or capacitor is not
connected correctly.
Check the connection.
The motor speed does not
change to the set speed.
The speed command voltage
select switch (SW1-1) is being ON
when the external potentiometer is
used.
Turn the speed command voltage
select switch (SW1-1) to OFF.
The speed command voltage
select switch (SW1-1) is being ON
when the speed command voltage
is 0 to 5 VDC.
The motor is rotating at the
maximum speed, while the
speed cannot be changed.
The rate generator is not
connected correctly.
Check the connection.
•
Motor operation is unstable.
•
Motor vibration is too great.
Effect of electrical noise.
See p.7 for measures with regard to
noise.
The motor doesn't start
instantaneously.
The acceleration time is too long.
Adjust the acceleration potentiometer.
Load inertia may be excessive.
Reduce the load inertia.
The motor doesn't stop
instantaneously.
Load inertia may be excessive.
Increase the frictional load or reduce
the load inertia.
