Honeywell HPM - AC Only Power System; Table 84 AC Only Power System Voltage Test Points

4 Fault Isolation
4.14 Power System Voltage Checks
388 HPM High-Performance Process Manager Service R688
Honeywell December 2020
AC Only Power System
Voltage test points
Refer to Figure 188 for identification the voltage points listed in the following table.
Table 84 AC Only Power System Voltage Test Points
Voltage Test Point
Acceptable Range
Corrective Action
AC Input
120 Vac
230 Vac
100 to 132 Vac
187 to 264 Vac
Check ac power source.
Power Supply Module
Common
DC Out (24 Vdc)
Connector Pins 3 and 4
(6 Vac for clock)
None
24 to 26 Vdc
2.0 to 6.0 Vac
Common reference
Replace Power Supply Module.
Replace primary (left) Power
Supply Module.
CMOS Battery Backup
Alkaline Battery
(Set of 3)
1.2 to 1.5 Vdc
(across 1 battery)
3.6 to 4.5 Vdc
(across 3 batteries)
Replace the batteries.