Name: Honeywell HPM
Brand: Honeywell
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2 Equipment Description

2.20 24 Vdc Fuse Protection

R688 HPM High-Performance Process Manager Service 101

December 2020 Honeywell

2.20 24 Vdc Fuse Protection

Card file fusing

Fuse protection is provided for the four types of card files. The following protection philosophy applies

for both the 7-Slot, 15-Slot, and IOP Only card files.

 The individual IOP card and an associated standard FTA are protected by a common fast-action

fuse that is located on the backpanel. The fuse has a 2 A rating.

 In addition to the 2 A protection, each individual IOP card has fast-action 0.5 A fuse protection that

is located on the card. The fast-action 0.5 A fuse is soldered in place and is not field replaceable.

You must replace the IOP card.

 Both HPMM cards, High-Performance Communications/Control and High-Performance I/O Link,

and the HPM UCN Interface module are protected by a fast-action 3.2 A fuse that is located on the

High-Performance I/O Link card. The fuse is field replaceable.

 A fast-action 2.0 A fuse protects the LLAI optical coupler module on backpanel U1. It generates

the line frequency phase reference signal that is used by LLAI IOPs.

Fuse removal

A Honeywell designed fusepuller is generally needed for extracting and inserting fuses in the HPM

backpanels because of the restricted space between components. The Honeywell part number is

51190586-100.

The fusepuller is comprised of three parts; an inner barrel that grasps the fuse, an end cap that is attached

one end of the inner barrel, and an outer barrel in which the inner barrel moves.

The following extraction and insertion procedures should aid in the use of the fusepuller.

Fuse extraction

Use the following procedure to extract a fuse from an HPM backpanel.

Step

Action

Hold the outer barrel of the fusepuller with the fingers of one hand and depress the the

fusepuller’s end cap with your other hand.

Place the protruding end of the inner barrel around the fuse. The fusepuller must be

perpendicular to the backpanel.

Release the end cap while still holding the outer barrel.

Move the outer barrel towards the backpanel. The greater the movement, the greater the

gripping force will be on the fuse.

Extract the fuse from the backpanel by vertically moving the fusepuller away from the

backpanel. Depress the end cap to release the fuse.

Honeywell HPM User Manual

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