Emerson Rosemount 3410 Series Maintenance And Troubleshooting Manual page 70

Meter repairs
December 2023
Postrequisites
If you encounter problems replacing the electronics, see Emerson.com/global.
3.8.2 Fuse replacement
Procedure
1. Remove power to the meter.
2. Disconnect the transmitter electronics enclosure security seals (see
3. Insert the replacement fuse (Littlefuse #218002.HXP) into the fuse holder.
4. Install the fuse cap into the holder and push until it is flush with the holder.
5. Turn the fuse cap clockwise ⅛ turn using a ¼-in. standard flathead screwdriver.
6. Replace the endcap and security latch (requires a 3 mm Allen wrench).
7. Adjust the security wire, removing all slack and thread into the lead seal.
8. Cut wire ends to remove excess wire.
9. Apply power to the meter.
This completes the fuse replacement procedure.
3.8.3 Replace backplane, Intrinsically Safe (IS) barrier, or power
supply board
The following sections detail removal of the backplane board, the IS barrier board, and the
power supply board.
Backplane replacement
Procedure
1. If replacing the backplane board, remove power to the meter.
2. Disconnect the transmitter electronics enclosure security seals, loosen the endcap
3. Remove the central processing unit (CPU) module and the optional input/output
4. Use a Phillips-head screwdriver and remove the four backplane board screws and
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loosen the endcap security latch (requires a 3 mm Allen wrench) on the terminal end
of the enclosure (see Figure
a) If required, install the security seal wire into and through one of the two holes
in the endcap.
b) Choose holes that minimize counterclockwise rotation of the endcap when
the security wire is taut (maximum wire diameter 0.078-in. (2.0 mm)) (see
Figure 3-24).
security latches (3 mm Allen wrench required), and remove both endcaps (see
3-24).
(I/O) module (if installed).
See Figure 3-22 for board locations and associated terminal blocks.
captive star washers from the enclosure standoffs.
Maintenance and Troubleshooting manual
3-21), and remove the endcap.
00809-0200-3104
Figure 3-24),
Figure
Emerson.com/Rosemount