
2.4 Check of battery
2-10
2.4
Check of battery
Yaskawa Siemens CNC series may be used with backup batteries for
• SRAM in CNC unit,
• calendar in CNC unit,
• 24V power supply to CNC unit
(Your machine may not have backup battery for 24V power supply to CNC.)
and / or
• position value in absolute encoder.
The procedure of replacing each battery is described below.
2.4.1
Battery for SRAM memory in CNC
Battery type
3V-lithium battery
• Order number: 6FC5247-0AA18-0AA0
Battery life
3 or 5 years, but it will change depending on operating status and environment.
Criteria of replacing battery
The 3V lithium battery to backup the SRAM is monitored in two stages:
The alarm
“
2101 - NCK battery alarm”
occurs when undervoltage of the battery is detected
during cyclic operation.
The alarm
“
2102 - NCK battery alarm”
occurs when undervoltage of battery is detected
during boot.
Table 2.7 Monitored Battery Voltage
Battery voltage
Message
2.7 to 2.9 V
ALARM:
“2100 NCK battery warning threshold reached
”
2.4 to 2.6 V
ALARM:
“2101 NCK battery alarm
”
ALARM:
“2102 NCK battery alarm
”