8-2
8-1 Error Processing
8
Troubleshooting
Precautions When Troubleshooting
When checking and verifying I/O after a problem has occurred, the Servomotor/Servo Drive may
suddenly start to operate or stop, so always use the following precautions.
You should assume that anything not described in this manual is not possible with this product.
îš„ Precautions
 Disconnect the cable before checking for wire breakage. Even if you test conduction with the cable
connected, test results may not be accurate due to conduction via bypassing circuit.
 If the encoder signal is lost, the Servomotor may run away, or an error may occur. Be sure to
disconnect the Servomotor from the mechanical system before checking the encoder signal.
 When performing tests, first check that there are no persons in the vicinity or inside the equipment,
and that the equipment will not be damaged even if the Servomotor runs away. Before performing
the tests, verify that you can immediately stop the machine using an emergency stop even if the
Servomotor runs away.
Replacing the Servomotor and Servo Drive
Use the following procedure to replace the Servomotor or Servo Drive.
îš„ Replacing the Servomotor
1. Replace the Servomotor.
2. Perform machine origin position alignment (for position control).
 When the Servomotor is replaced, the Servomotor’s origin position (phase Z) may deviate, so
origin alignment must be performed.
 Refer to the Position Controller’s operation manual for details on performing origin alignment.
îš„ Replacing the Servo Drive
1. Copy the parameters.
 Use the copy function of the Parameter Unit to copy all the parameter settings to the Parameter
Unit. Alternatively, use the Parameter Unit to display all the parameter settings and write them
down.
2. Replace the Servo Drive.
3. Set the parameters.
 Use the copy function of the Parameter Unit to transfer all the saved parameters to the Servo
Drive. Alternatively, use the Parameter Unit to set all the parameters.
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