Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 89)

Section 3A
Primary 9/230 Components
3A-6
The memory for data such as part programs, tool offset/compensation data,
and work coordinate offset data is stored on the processor board. In the
case of a power failure, there is a super capacitor on the processor board
that backs up this data for up to 5 days (at 40
°
C) on systems without
extended program storage. This super capacitor recharges within 1 hour of
power turn on if completely discharged. If you want to extend this backup
time, install the lithium battery pack (8520-LIBAT) that supports the data
for:
9/230 Control and Description: Time (at 40°C Discharge):
standard 3 years
with extended program storage 1 year
The lithium battery pack also supports 8520 absolute encoder power. This
battery pack is connected to the lithium battery connector (P1) on the
processor board as shown in Figure 3A.6. Batteries and battery cable are
included with the battery replacement kit.
Figure 3A.6
Lithium Battery
Polarity
1
2
Pin Number
1
2
--
+
Polarity
1 2
Pin Number
1
2
--
+
The lithium battery contains heavy metals and
must be collected separately from other waste.
3A.1.3
Battery Backup