YASKAWA SGMAH, User Manual, Page: 388 / 488

Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
9 - 4
9.1.3 Replacing the Battery for the Absolute Encoder
If the voltage of the battery for an absolute encoder drops to about 2.7V or less, an
Absolute Encoder Battery Alarm (A. 83*) will occur in the servo amplifier. This
alarm occurs when the servo amplifier receives a signal from the absolute encoder
when the power to the servo amplifier is turned ON. Therefore, the servo amplifier
will not give an alarm when the battery voltage drops below the minimum voltage
level while the power is being supplied to the servo amplifier.
Refer to
5.7.3 Handling Batteries for the battery type recommended for absolute
encoders.
Replace the battery using the following procedure if the battery voltage drops below
the minimum required battery voltage.
Battery Replacement Procedure
1. Replace the battery while the control power to the servo amplifier is ON.
2. After replacement, turn OFF the power to the servo amplifier in order to clear the
Absolute Encoder Battery Alarm (A. 83).
3. Turn ON the power to the servo amplifier again and confirm that it operates
properly.
Note: The absolute encoder data will be lost when the control power to the servo amplifier is turned OFF
and the encoder cable is disconnected from the battery. If the data is lost, refer to
5.7.4 Absolute
Encoder Setup and follow the procedure to initialize the absolute encoder.
*Alarm A.83 is described in greater detail on page 9 - 22.