2 Equipment Description
2.16 Power Distribution
96 HPM High-Performance Process Manager Service R688
Honeywell December 2020
No battery backup (HPM Standard Power System)
When there is no battery backup, a battery backup failure is reported unless the zero-ohm resistor
jumpers, W1 and W2, located next to the Power Supply Module connectors, are cut. This is done at the
factory before shipping. If a battery backup is later installed, the connections must be restored. The
following figure is a view of the HPM Standard Power System backpanel.
Figure 32 HPM Standard Power System Backpanel
CMOS Battery Backup
Depending on the Power System configuration, three rechargeable NiCad or three nonrechargeable
alkaline batteries provide a nominal 3.6 Vdc for CMOS memory backup power. The batteries support all
the memory circuits in the HPMM(s) and IOPs. NiCad batteries are long-lived, and they are
automatically tested periodically. Every 8 seconds the batteries' output voltage is tested for the proper
level, and every 2 hours a load is applied to the batteries and the voltage level is again tested.
The early production Standard Power System uses 3 “AA” size NiCad batteries which provide
approximately 12 hours of backup. The enhanced Standard HPM Power System uses 3 “C” size NiCad
batteries which provide approximately 45 hours of backup.
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