8 Periodic Redundancy Tests
8.6 Power Supply Module Redundancy
464 HPM High-Performance Process Manager Service R688
Honeywell December 2020
8.6 Power Supply Module Redundancy
Power System redundancy introduction
A Power System with redundant Power Supply Modules should continue to provide power to the High-
Performance Process Manager without interruption when one of the Power Supply Modules fails or
looses ac power.
Power cable redundancy testing should be performed during a plant shutdown.
SHOCK HAZARD
Troubleshooting, opening this equipment and removing any panels or covers will expose the
user to the risk of a shock hazard. There are no user serviceable parts inside this equipment.
Refer all servicing only to qualified service personnel.
Power System redundancy test procedure
Perform the following steps to test the Power System’s redundancy power capability.
With the both Power Supply Modules of a redundant Power System operating, place
the ON/OFF switch of the right Power Supply Module in the OFF position. Observe that
the HPMM and IOP cards continue to operate normally (their Status and Power
indicators are illuminated). Return the ON/OFF switch to the ON position if operation
continues normally. Should the HPMM and IOP cards not continue to operate normally,
follow the troubleshooting and replacement procedures for the Power Supply Module in
the “Fault Isolation” and “IOP Calibration Procedures” sections.
With both Power Supply Modules of a redundant Power System operating, place the
ON/OFF switch of the left Power Supply Module in the OFF position. Observe that the
HPMM and IOP cards continue to operate normally. Return the ON/OFF switch to the
ON position if operation continues normally. Should the HPMM and IOP cards not
continue to operate normally, follow the troubleshooting and replacement procedures
for the Power Supply Module in the “Fault Isolation” and “IOP Calibration Procedures”
sections.
When the left Power Supply Module’s ON/OFF switch is placed in the OFF position, all
Low Level Analog Input IOPs should report a Soft failure at the Universal Station, but
they will continue to operate normally.
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