Yaskawa DR2 Sigma Servo - Manual (Page 402)

INSPECTION, MAINTENANCE, AND TROUBLESHOOTING
6.1.3 Replacing Battery for Absolute Encoder
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6.1.3 Replacing Battery for Absolute Encoder
Battery replacement is only required for servo systems using an absolute encoder.
The battery type recommended below (purchased by the customer) is installed in the host
controller to allow the absolute encoder to store position data when the power is turned OFF.
Recommended Battery:
• Lithium Battery
ER 6 V C3, manufactured by Toshiba Battery Co.,
Ltd. 3.6 V, 2000 mAh
Estimated Life: Approximately 10 years
Host Controller
+5 V
0V
0V
0V
Servopack
Servomotor
12-bit absolute encoder
Battery
1CN-4
1CN-2
1CN-21
1CN22
1CN-33
1CN-34
1CN-35
1CN-36
1CN-19
1CN-20
1CN-48
1CN-49
1CN-1
RESET
The battery voltage is not internally monitored in the Servopack. Therefore, detect low battery
voltage at the host controller.
Minimum required battery voltage is 2.8 V.
Replace the battery according to the following procedure if the battery voltage drops to the
minimum required battery voltage. The battery maintains absolute position data stored in the
encoder.
Battery Replacement Procedure:
1) Turn ON the Servopack and wait at least 3 minutes. The absolute encoder capacitors are
charged.
2) Replace the battery in the host controller. The Servopack power supply can be ON or
OFF during battery replacement.
Note After completing step 1 above, the absolute encoder will function normally for up to 2 days
with no battery.
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