12-33
12-5 Periodic Maintenance
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
12
Troubleshooting and Maintenance
Replacing the Absolute Encoder Battery
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) has occurred.
Replacement Battery Model and Specifications
Mounting the Backup Battery Unit
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 to Absolute Encoder Setup on page 10-6.
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, battery errors may occur due to voltage delay in the battery.
Replacing the Battery Unit
If a battery warning occurs, the absolute encoder power supply 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.
Precautions for Correct Use
 If the absolute encoder is cleared using the front panel or the absolute value is cleared using
communications, all error and multi-rotation data will be lost and the absolute encoder must be set
up again. Refer to Absolute Encoder Setup on page 10-6.
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
ABS
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