Honeywell HPM, Service

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2 Equipment Description
2.16 Power Distribution
94 HPM High-Performance Process Manager Service R688
Honeywell December 2020
2.16 Power Distribution
Overview
AC input power connections are made to the two AC Input terminal strips at the upper left side of the
backpanel in the early production Standard Power System.
The connections are located on the lower left side of the backpanel, behind the left Power Supply
Module, in the HPM Standard Power System.
Primary and redundant terminals can be wired in parallel from a single power line source, or wired
separately from two power line sources. See Figure 31 and Figure 32.
Power distribution is illustrated in the following figure.
Figure 30 Power Distribution
User's Power
Source "A"
Optional 48 Vdc
Battery
3.6 Vdc CMOS
Memory Backup
3.6 Vdc 24 Vdc 6 Vac
Redundant Power
Supply Module
Battery Maintenance Switch
Battery Power (ac off)
Battery Charging (ac on)
Primary Power
Supply Module
User's Power
Source "B"
(or "A")
2303
AC Only Power System ac power
AC input power connections to the AC Only Power System are made to the AC Input terminal strips at
the left side of the AC/DC Distribution board as shown in Figure 29. The upper AC Input terminal strip
powers the optional redundant Power Supply Module, and the lower AC Input terminal strip powers the
primary Power Supply Module. Like the Standard Power System, the primary and redundant terminals
can be wired in parallel from a single power line source, or wired separately from two power line
sources.
Battery Backup Module
The Battery Backup Module used to power the 24 Vdc Power Supply Modules is a 48 Vdc lead acid
battery that provides backup power for approximately 25 minutes with a full charge. The charging circuit
is active in both Power Supply Modules whenever ac power is available to the Power Supply Module(s).
At least one Power Supply Module must be present to allow the battery to supply power to the card files.