Rockwell Automation MPP Processor Moduile - Manual (Page 24)

24 MPP October 2005 – Issue 6
Triguard SC300E
BATTERY REPLACEMENT
Fresh batteries will sustain SRAM for a total of about six months (either in one long stretch, or
in several shorter stretches). The backup batteries should be replaced where it is known that
the total battery drain period is approaching six months or once every five years (whichever
occurs first).
If the SC300E System is Operating
1. Remove one of the three MPPs.
2. Remove and safely dispose of both batteries.
3. Wait about 5 minutes for any capacitance in the system to discharge.
4. Ensuring the correct polarity Figure 1-1 , fit the new batteries.
5. Replace the MPP and perform a warm start.
6. Repeat the above procedure for each of the remaining MPPs in turn.
If the SC300E System is Not Operating
If the system is not powered up, the data in SRAM is being supported by the backup batteries.
To preserve this data it is important not to remove both batteries at once.
If only one battery is fitted, install a new battery in the vacant slot before removing the old
battery.