Installing the PM86x/TP830 Processor Unit in Redundant Configuration Section 2 Installation
92 3BSE036351-510 A
8. The CPUs are supplied with internal back-up batteries. When the batteries are
to be used, place them in the Internal Battery Holder (
Figure 63 on page 193).
When the external SB821/SB822 battery units are to be used, install them
according to the instructions in
Installing the SB821 External Battery Unit on
page 143/Installing the SB822 Rechargeable External Battery Unit on page
144.
Do not place the internal back-up battery in the battery holder until the AC 800M
Controller has been powered-up normally and the memory back-up function has
been activated, that is, the B(attery) LED flashes. If no normal power supply is
connected to the processor unit with the battery in place, then the CPU memory
will immediately start to consume battery power.
Always install a fresh internal or external battery at the end of the installation
phase. The original battery is heavily utilized due to frequent blackouts during
system installation.
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