Changing The Battery - Siemens SINUMERIK 840Di Manual

2 Hardware Descriptions
2.2 MCI board
2.2.3

Changing the battery

Battery type
Order No.
Service life
General rules
for handling
!
Criteria for
changing the
battery
2-50
3V lithium battery
Designation
Backup battery
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
2.7 ... 2.9V
2.4 ... 2.6V
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.
Order No. (MLFB)
6FC5 247-0AA18-0AA0
Message
Alarm: "2100 NCK battery warning threshold reached"
Alarm: "2101 NCK battery alarm"
Alarm: "2102 NCK battery alarm"
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
06.03