Yaskawa MP920 User's Manual Design - Manual (Page 490)

11 Maintenance and Inspection
11.3.6 Replacing the Battery
11-18
7. Check the indicators and output signals.
a) Indicators
It is normal if the POWER indicator is lit, and the ALARM1 and ALARM2 indica-
tors are not lit.
b) Output Signals
It is normal if the PON signal is ON, and the ALM1 and ALM2 signals are OFF.
It is abnormal if the POWER indicator is not lit, or both or either of the ALARM1 and
ALARM2 indicators are lit. If this is the case, repeat the above procedure from step 2.
The possible cause of this abnormality is as follows:
• The lithium battery connector is connected incorrectly or incompletely.
• The external power supply/external I/O connector (CN1) is not connoted properly, or
the cables are broken.
8. Unless there is abnormality, the battery replacement procedure is complete. If the sys-
tem power is OFF, turn it ON.
• Before replacing the lithium battery, turn ON the Battery Module and the Absolute Encoder, and
leave them ON for about 10 minutes. The high-capacity capacitor of the Absolute Encoder will be
charged.
• Be careful not to touch the internal circuit on the board with the hands or screwdriver during the
work.
• The built-in lithium battery in the Battery Module may explode if charged. Never charge the bat-
tery.
IMPORTANT