Yaskawa i80M Maintenance Manual - Manual (Page 74)

2.5 BATTERY (Cent’d)
❑
With the power ON, make sure that the blinking
display on the CRT screen or the red LED at the
front of the model model
and model JANCD-FC400 boards goes OFF.
If they are still illuminated, it is due to an
improper battery connection or a defective battery.
When any of alarms 2121 and after (encoder battery
error) occurs, DGN is not output.
When DGN is output, the LED goes on
only in the case where the CMOS backup battery is
exhausted.
This battery differs from the encoder battery.
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