Yaskawa MP940 Reference Manual - Manual (Page 356)

MotionSuite™ MP940 Machine Controller Reference Manual Servo Amplifier Maintenance/Inspection
10-3
Replacing the Absolute Encoder Battery
The servo amplifier issues an “Absolute Encoder Battery Alarm (A.83)” if
the absolute encoder battery voltage falls below 2.7V (approximately). The
servo amplifier only receives the warning signal for this alarm from the
absolute encoder and outputs the alarm at amplifer power-up. No alarm is
output if the battery voltage drops while the servo amplifier power is ON.
Battery Replacement Procedure
1. Replace the battery only when the servo amplifier control power is ON.
2. After replacing the battery, turn the servo amplifier power OFF to
release the “Absolute Encoder Battery Alarm (A.83)”.
3. Battery replacement is complete if there are no operational errors fol-
lowing the servo amplifier power being turned ON again.
The absolute encoder data is lost if the servo amplifier control power is
turned OFF and the battery is disconnected (i.e., when removing the encoder
cable). Absolute encoder setup must be performed in this situation.