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12.2.1.8 Replacing T-type Boards
Lockout tagout the field equipment and isolate the power source.
1.
2.
Check the voltage on each terminal and ensure no voltage is present.
3.
Unplug the I/O cable (J-Plugs).
4.
If applicable, unplug JF1, JF2, and JG1.
If applicable, remove TB3 power cables.
5.
6.
Loosen the two screws on the wiring terminal blocks and remove the blocks, leaving the field wiring attached.
7.
Remove the terminal board and replace it with a spare board, check that all jumpers are set correctly (the same as in the
old board).
Screw the terminal blocks back in place and plug in the J-plugs and connect cable to TB3 as before.
8.
12.2.1.9 Replacing Fuses
➢ ➢ To replace a fuse
1.
Lockout and/or tagout the field equipment and follow all equipment and site safety guidelines including use of safety
glasses and any additional PPE.
Using a flat blade screwdriver, twist the fuse holder cap 1/8 turn counter-clockwise.
2.
3.
Remove the fuse and cap from the circuit board mounted holder.
4.
Remove the old fuse from the fuse holder cap.
5.
Inspect the new fuse to verify that the fuse being replaced has the same voltage, current, and interrupting current (IC)
ratings. Confirm that this rating matches the specification for the board or values provided in the application system
elementary. There is also a table in GEH-6855_Vol_I that lists fuses and terminal boards.
6.
Insert the new fuse into the fuse holder cap in the same orientation as the one removed.
Place the fuse and cap into the fuse holder. Using the flat blade screwdriver, quickly push-in and twist 1/8 turn clockwise.
7.
Note If the fuse opening fault condition has not been removed, you may fail the new fuse when it is inserted into the holder.
Maintenance and Replacement
Public Information
GEH-6855_Vol_II System Guide 483
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