Yaskawa SGDB - Manual (Page 511)

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.
Install the battery type recommended below (purchased by the customer) in the host control-
ler 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 SGDB SERVOPACK
SGMj servomotor
12 bit absolute encoder
Battery
Shielded wire
/PAO
/PBO
/PCO
/PSO
/PA
/PB
/PC
/PS
Note PS, PSO signals are used only for 12 bit absolute encoder.
The battery voltage is not internally monitored in the SERVOPACK. Therefore, detect low bat-
tery 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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