4 Fault Isolation
4.8 HPMM Card and Module Indicators
R688 HPM High-Performance Process Manager Service 357
December 2020 Honeywell
HPM UCN Interface module Transmit indicator
On the HPM UCN Interface module, the Transmit indicator is used to indicate that the card is
transmitting data on the UCN and flickers periodically. Many times the off state of this indicator is very
short. If the Network Interface Module (NIM) has not been downloaded and token passing has not
begun, the Transmit indicator remains off. See the High-Performance Process Manager Checkout
manual.
Power and Status indicators
Check the Power and Status indicators on both cards and the HPM UCN Interface module. If any of
the indicators are off, troubleshoot the cause based on descriptions and checks previously described.
Replace the failed card or module by using the appropriate procedure described in the “Removal and
Replacement” section.
HPMM fuse
The HPMM card set is powered through a 3.2 A fast-action fuse on the High-Performance I/O Link card.
If the fuse is blown, power to the entire HPMM card set is removed. If either HPMM cards or its UCN
Interface module has its Power indicator illuminated, the status of the fuse on the High-Performance I/O
Link card is good.
UCN Interface Module fuse
The UCN Interface Module is supplied regulated dc power from the High-Performance I/O Link card
through a 2 amp. fuse on the backpanel. This fuse is located immediately to the right of the leftmost
connector on the backpanel. Removal of the UCN Interface Module is required to gain access for
replacement of this fuse.
Note: If the same 7-Slot or 15-Slot card file is used as an IOP card file, the fuse will provide power
protection for the IOP (and associated FTA) in the leftmost card slot.
HPMM Card extractors
If the upper card extractor on either the High-Performance Communications/Control card or High-
Performance I/O Link card is unlocked and lifted slightly, power is disconnected from the card.
The 24 Vdc from the Power System is distributed on the card file backpanel from the backpanel’s power
connectors to the High-Performance Communications/Control card. On the card, it passes through a
switch that is controlled by the upper card extractor back through the backpanel to the High-Performance
I/O Link card.
On the High-Performance I/O Link card, it passes through a switch that is controlled by the upper card
extractor, through a 3.2 Amp. fuse, to the a voltage converter on the card that produces +5 Vdc that is
distributed internally to the High-Performance I/O Link card and externally through the backpanel to the
High-Performance Communications/Control, and the UCN Interface module.
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