Siemens SINUMERIK 840Di - Changing the Battery

06.03
2.2 MCI board
2-50
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
2.2.3 Changing the battery
3V lithium battery
Designation Order No. (MLFB)
Backup battery 6FC5 247-0AA18-0AA0
Typical battery service life: > 3 years
Please observe the following general rules when handling batteries:
S Do not charge them!
S Do not heat or burn them!
S Do not drill or squeeze them!
S Do not manipulate them in any other fashion neither mechanically, nor
electrically!
!
Caution
Improper handling of backup batteries results in the hazard of inflammation,
burning or explosion.
The 3V lithium battery to back up the SRAMs and the clock module is monitored
in stages:
Battery voltage Message
2.7 ... 2.9V Alarm: “2100 NCK battery warning threshold reached”
2.4 ... 2.6V Alarm: “2101 NCK battery alarm”
Alarm: “2102 NCK battery alarm”
The alarm “2101 NCK battery alarm” is output if battery low voltage is detected
in cyclic operation.
The alarm “2102 NCK battery alarm” is output if battery low voltage is detected
during power-up.
Battery type
Order No.
Service life
General rules
for handling
Criteria for
changing the
battery
2 Hardware Descri
p
tions