2 Equipment Description
2.15 Power Systems
R688 HPM High-Performance Process Manager Service 93
December 2020 Honeywell
AC Only Power System
The AC Only Power System offers optional 8- or 16-ampere redundant Power Supply Modules, but does
not offer the optional 48 Vdc Battery Backup module feature and rechargeable NiCad CMOS memory
backup power. Nonrechargeable alkaline battery CMOS memory backup power is provided instead.
The following figure is an illustration of the AC Only Power System. Like the early production Standard
Power System, the AC Only Power System has eight power distribution output connectors and four fused
Cabinet Fan Assembly power connectors. There are two sets of normally open alarm contacts, each set
operated by a relay, that signal a Power Supply Module failure. The alarm signals are normally wired in
series to a 24 Vdc Digital Input FTA to notify the system when a Power Supply Module fails. Two LED
indicators, mounted on the AC Only AC/DC Distribution Assembly, offer a visual indication of a Power
Supply Module failure when the LED is extinguished.
Figure 29 AC Only Power System
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