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Maxiflex P3 PAC User Manual
23
-© Omniflex
UMM126XR18.pdf
4. Installing the CPU
4.1 Connecting the Internal Battery
Before installing the CPU, the internal battery must be connected.
The CPU is shipped from the factory with a “Battery Disconnect Tab” protruding through the
top of the unit. Pull on the tab to remove before use.
4.2 Connecting the memory battery backup
The battery in the CPU is used for two purposes:
The battery is always used to retain the real-time clock while the power is off.
The battery can also be optionally used to retain user data in the Data Interchange Table
(DIT) when the power is off.
This is not normally required, and if you do not specifically have a need for this feature, then
it should not be enabled.
Enable the DIT battery backup feature if required by connecting the battery link, accessible
through the front door of the CPU module. The battery link is shipped connected. To activate
the battery, pull out the protective tab which says “PULL TO CONNECT BATTERY”.
Figure 4.1 P3 Battery Link shown disconnected (as shipped)
Upon power-up, the CPU checks for valid data in the DIT. If there is no valid data, then the
DIT is cleared to zero.
CAUTION
– Battery Life:
The Battery used in the P3 CPU is a non-rechargeable Lithium Battery (see section 15 for
replacement details).
With power on, there is no drain from the battery, and the life of the battery will be close to its
expected shelf life.
With power removed from the CPU, the battery life will be significantly reduced if the DIT
battery backup link is installed, due to the extra consumption of the DIT memory.
Therefore only connect the link if this feature is required.
Battery Link