Troubleshooting
61
11-4
Troubleshooting and remedial actions
In motor operation, the motor or the driver may not operate properly due to an improper setting or wrong
connection.
When the motor cannot be operated properly, refer to the contents provided in this chapter and take an appropriate
remedial action.
If the problem persists, contact your nearest Oriental Motor sales office.
Phenomenon
Possible cause
Remedial action
•
The motor is not excited.
•
The motor output shaft can
be rotated by hand.
Connection error of the motor
cable.
Check the motor connection.
The FREE input is being ON.
Turn the FREE input OFF.
The motor has a holding torque
even if it is put into a non-
excitation state.
Effect of dynamic brake.
If the motor is put into a non-excitation state using the
C-ON input or the STOP-COFF input, the motor
windings are brought into a state of being short-
circuited inside the driver, generating a larger holding
torque than when no current is supplied (dynamic
brake). To release the dynamic brake, shut off the main
power supply and control power supply or turn the
FREE input ON.
The motor does not rotate.
When an electromagnetic brake
motor is used, the electromagnetic
brake is in a state of holding the
motor shaft.
•
Check the connection of the electromagnetic brake.
•
Make the input voltage of the control power supply
higher than 22.8 VDC.
The position (travel amount) is not
set in the operation data when
positioning operation is performed.
Check the operation data.
When JOG operation, high-speed
JOG operation, or continuous
macro operation is performed, the
input in the forward direction and
that in the reverse direction are
simultaneously ON.
Turn both inputs in the forward direction and the
reverse direction OFF, and then turn either one ON.
The STOP input is being ON.
Turn the STOP input OFF.
The motor rotates in the
direction opposite to the
specified direction.
The “Motor rotation direction”
parameter is set wrongly.
Check the setting of the “Motor rotation direction”
parameter.
The gearhead output shaft
rotates in the direction opposite
to the motor.
A geared motor that rotates in the
direction opposite to the motor
output shaft is used.
•
With the
TS
geared type, the gearhead output shaft
rotates in the direction opposite to the motor when
the gear ratio is 20 or 30.
•
With the Harmonic geared type, the gearhead
output shaft always rotates in the direction
opposite to the motor.
Motor operation is unstable.
Connection error of the motor
cable or the power supply cable.
Check the connections for the driver, the motor, and
the main power supply.
A value set in the “Base current”
parameter is too low.
Check the setting of the “Base current” parameter. If
the motor current value is low with respect to a load,
the torque will also be low and the operation will be
unstable.
The “Main power mode” parameter
is set wrongly.
Check the setting of the “Main power mode”
parameter.
The main power supply starts up
slowly or the voltage of the main
power supply is unstable.
Set the “Main power mode” parameter to “0: 24 VDC” or
“1: 48 VDC” according to the rated voltage of the main
power supply.
