REPAIR/REPLACEMENT PROCEDURES
TERMINATION UNIT REPLACEMENT PROCEDURES
4 - 2
I-E96-407A
®
When replacing a termination unit, verify that:
1. The proper fuses have been installed on the replacement
termination unit.
2. All dipshunts are configured on the replacement termina-
tion unit the same as on the failed unit.
3. The module terminated by the faulty termination unit
should be disconnected from the termination unit cable before
the NKTU01 cable is disconnected from the termination unit.
Pull the module out of its module mounting unit slot so that its
edge connector is not in contact with the termination cable
connected to the module mounting unit backplane.
NOTE: Turn off power to the cabinet before removing the +24 VDC
and grounding connection to the termination unit.
To replace the termination unit:
1. Label and remove all field wiring from the terminal blocks
(TB1 through TB4).
2. Label and disconnect the cable connected to the termina-
tion unit at P1.
3. Label and disconnect 24 VDC I/O power and sys-
tem common from the E1 and E2 terminals.
4. Remove the 2 screws securing the termination unit to the
field termination panel and the chassis ground screw and slide
out the termination unit.
5. Insert the tabs of the circuit board into the proper slots of
the field termination panel standoff and slide the new circuit
board into position.
6. Secure the termination unit circuit board to the field termi-
nation panel with 2 screws.
7. Install the chassis ground screw with external star lock
washer.
8. Connect all wiring.
CAUTION
Remove modules from their assigned module mounting unit
slots before installing or removing a cable connected to that
slot. Failure to do so could result in damage to the module.
ATTENTION
Retirer le module de son emplacement dans le chassis de
montage des modules avant d'installer ou de retirer un cable
assigne a cet emplacement. Un manquement a cette procedure
pourrait endommager le module.
