Check Of Battery; Battery For Sram Memory In Cnc - Siemens YASKAWA 840DI Maintenance Manual

2.4 Check of battery

2.4

Check of battery

2.4.1
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.

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:
Battery voltage
2.7 to 2.9 V
2.4 to 2.6 V
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
ALARM: "2100 NCK battery warning threshold reached
ALARM: "2101 NCK battery alarm
ALARM: "2102 NCK battery alarm
2-10
Message
"
"
"