12 Troubleshooting and Maintenance
12-38
G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
Replace the Absolute Encoder Backup Battery Unit if it has been used for more than 3 years or if an
Absolute Encoder System Down Error (Error No. 40.0) has occurred.
z Mounting the Battery Unit for the First Time
Connect the Absolute Encoder Backup Battery Unit to the motor, then set up the absolute encoder.
Refer to10-2-4 Absolute Encoder Setup on page 10-7.
After the Absolute Encoder Backup Battery Unit is attached, it is recommended that the control
power supply be turned ON and OFF once a day to refresh the battery.
If you do not refresh the battery, the Battery Warning may occur due to voltage delay in the battery.
z Replacing the Battery Unit
If the Battery Warning occurs, the Absolute Encoder Backup Battery Unit must be replaced.
Replace the Battery Unit with the control power supply of the Servo Drive turned ON. If the Battery
Unit is replaced with the control power supply of the Servo Drive OFF, data held in the encoder will
be lost.
The Battery Warning will occur after you replace the Absolute Encoder Backup Battery Unit. Use
one of the following methods to clear it.
• Perform the Error Reset (4107 hex) from the host controller.
• Use the absolute encoder setting in the CX-Drive.
Precautions for Correct UsePrecautions for Correct Use
• If the absolute encoder is cleared using communications, all error and multi-rotation data will
be lost and the absolute encoder must be set up again. Refer to 10-2-4 Absolute Encoder
Setup on page 10-7.
12-5-3 Replacing the Absolute Encoder Battery
Replacement Battery Model and Specifications
Item Specifications
Name Absolute Encoder Backup Battery Unit
Model R88A-BAT01G
Battery model ER6V (Toshiba)
Battery voltage 3.6 V
Current
capacity
2,000 mA · h
Mounting the Backup Battery Unit
ABS
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