Yaskawa FSP Amplifier - Manual (Page 269)

FSP Amplifier 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 2.7 V 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 C.9 Absolute Encoder Battery 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 of the servo amplifier in order
to clear the Absolute Encoder Battery Alarm (A.83).
3. Turn ON the power of 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 5.7.3 Absolute Encoder Setup and
follow the procedure to initialize the absolute encoder.
* Alarm A.83 is described in greater detail in section 9.2.1.