Omni 4000 Series - Page 191

OMNI 4000/7000 Operations and Maintenance Guide – Rev F
7-56
Maintenance
6.
a. Replace the malfunctioning fuse with
a new one, following the
specifications for the Standard Back
Panel indicated in Table 7-1.
b. Carefully apply downward pressure
and turn the base of the fuse holder
clockwise to re-install the fuse. Do not
over-tighten (the fuse holder will stop
when tightened sufficiently).
c. Verify that the fuse cartridge is fully
seated.
7.
Repeat Steps 5 and 6 for the second fuse,
if needed.
When finished, go to Step 16 to complete
the fuse maintenance.
8.
The standard extended back panel has
one 1/4 turn AC cartridge fuse, one DC
power fuse and eight loop power fuses
(F1–F8) that are installed in clips (Table
7-2):
a. For the AC cartidge fuse, go to
Step 9.
b. For the clip-installed fuses, go to
Step 11.
9.
a. To remove the AC cartridge fuse, use
a flat-head screwdriver and insert the
head into the slot at the top of the
fuse holder.
b. Apply downward pressure and turn
the screwdriver counter-clockwise to
remove the fuse.
10.
a. Replace the malfunctioning fuse with
a new one, following the
specifications for the AC 5x20 fuse
indicated in Table 7-2.
b. Carefully use the screwdriver to apply
downward pressure and turn the fuse
holder clockwise. Do not over-tighten.
c. Verify that the fuse cartridge is fully
seated.
11.
To remove a clip-installed fuse, disconnect
its power connections to the field device
before removing the fuse.