Power Cable Redundancy; Introduction; Test Procedure - Honeywell HPM Service

8.5

Power Cable Redundancy

Introduction

Card files, the Digital Input Power Distribution assembly, and the Galvanic Isolation Power Distribution
assembly are provided with redundant power cables to enhance power distribution reliability within the
High-Performance Process Manager. You should be able to disconnect either end of one of the two
power cables providing power to the card file, Digital Input Power Distribution assembly, or Galvanic
Isolation Power Distribution assembly without affecting equipment operation.
CAUTION
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.

Test procedure

Perform the following steps for each card file, Digital Input Power Distribution assembly, and Galvanic
Isolation Power Distribution assembly.
Step
1
Disconnect one of the pair of power cables for a card file, Digital Input Power
Distribution assembly, or Galvanic Isolation Power Distribution assembly at either the
Power System connection or the other end of the cable. Determine if the operation of
the equipment is impaired by observing the operation of the affected IOPs and/or
HPMM cards.
2
Replace the cable connection and then disconnect the other cable in the pair.
Determine if the operation of the equipment is impaired.
3
Repeat steps 1 and 2 for all card files, Digital Input Power Distribution assemblies, and
Galvanic Isolation Power Distribution assemblies.
R688
December 2020
Power cable redundancy testing should be performed during a plant shutdown
HPM High-Performance Process Manager Service
Action
Honeywell
8 Periodic Redundancy Tests
8.5 Power Cable Redundancy
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