Troubleshooting and remedial actions
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9 Troubleshooting and remedial actions
During motor operation, the motor or speed controller may fail to function properly due to an improper rotation 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 Oriental Motor sales ofce.
Note
Certain items must be checked with the power on. Perform inspections carefully not to touch the live part
such as connection part of the motor and speed controller.
The motor does not rotate.
Possible cause Remedial action
Both the FWD input and REV input are being OFF.
Turn either of the FWD input or REV input ON.
Both the FWD input and REV input are being ON.
The rotation speed has not set in the operation data.
Set the operation data.
The motor does not rotate if the rotation speed is not set.
Although the external speed setter is used to set the
rotation speed, the setting in the "external speed command
input" parameter has not changed.
Set the "external speed command input" parameter to "ON
(Enable)."
The AC power supply, motor or capacitor has not
connected correctly.
Check the connection.
The FREE input is being ON. Turn the FREE input OFF.
The speed cannot change. The motor does not rotate at the set speed.
Possible cause Remedial action
The operation data selection input has not been switched. Check whether the M0 input and M1 input is switched correctly.
When the external speed setter is used, both the M0 and
M1 inputs are not turned OFF.
Turn the M0 and M1 inputs OFF.
When the external speed setter is used, the "external
speed command input" parameter has not changed.
Set the "external speed command input" parameter to "ON
(Enable)."
The setting range of the rotation speed is limited.
Check the setting for the "speed upper limit" and "speed lower
limit" parameters.
The motor rotates in the direction opposite to the specied direction.
Possible cause Remedial action
The FWD input and REV input are connected wrongly or
otherwise not connected correctly.
Check the connection of the FWD input and REV input.
The gearhead that rotates in the opposite direction to the
motor rotation direction is used.
Reverse the FWD input and REV input operations.
For details, refer to "6.5 Motor rotation direction" on p.21.
Change the setting for the "motor rotation direction" parameter.
The setting for the "motor rotation direction" parameter is
changed.
Change the setting for the "motor rotation direction" parameter.
The setting cannot be performed using the operation panel
Possible cause Remedial action
The edit lock function has been enabled. Release the edit lock function.
Motor operation is unstable. Motor vibration is too great.
Possible cause Remedial action
Effect of electrical noise.
Refer to "11.2 Installing and wiring in compliance with EMC
Directive" on p.38 for measures with regard to noise.
The motor doesn't start instantaneously.
Possible cause Remedial action
The acceleration time is too long. Adjust the acceleration time.
Load inertia may be excessive. Reduce the load inertia.
A load may be excessive. Reduce the load.
The motor rotates even if the speed command has not input.
Possible cause Remedial action
The speed has been set in the "speed lower limit" parameter. Set the value in the "speed lower limit" parameter to "0."
The alarm code is displayed
refer to "8.1 Alarm" on p.32.
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