6 NFS-320 and NFS-320SYS UL Listing Document — P/N 52745LD:G9 5/19/2022
1.2 NFS-320 Option Boards
The NFS-320 ships fully assembled within its cabinet. One or two option boards can be mounted inside the NFS-320 cabinet, under the keypad, as
shown in Figure 12. Option boards that can be installed internally include the wire and/or fiber versions of the NCM or HS-NCM, TM-4, and UDACT/
UDACT-2. When installing option boards, temporarily remove the KDM-R2/C keypad/display unit to provide full access to hardware connections.
1. Remove and re-install KDM-R2/C as shown in Figure 11. It may be convenient to do some basic field-wiring before reinstalling KDM-R2/C.
2. Lay the first option board over the four stand-offs already installed on the CPU, so that the holes and stand-offs align.
3. If attaching a second option board, use its standoffs to secure the first option board, then lay the second option board over the standoffs. Two sizes
of standoffs are shipped with the option boards; select standoffs that allow sufficient clearance for electronics on the lower option board.
4. Secure the top option board with four #4-40 screws (supplied).
5. Re-attach KDM-R2/C.
NOTE: UDACT/UDACT-2 only:
If using a UDACT or UDACT-2 inside the cabinet, do not install a second option board.
See the UDACT Manual or UDACT-2 Manual for instructions on using the mounting bracket.
CAUTION: EARTH GROUND
IT IS CRITICAL THAT ALL MOUNTING HOLES OF THE NFS-320 ARE SECURED WITH A SCREW OR STANDOFF TO
INSURE CONTINUITY OF EARTH GROUND.
NOTE: It may be convenient to field-wire the SLC loop before installing any option boards, and to make wiring connections on the first option
board before installing a second option board in front of it.
Figure 11 Removing and Reinstalling KDM-R2/C
320_assembly_tech_pubs_5-2.wmf
Figure 12 Installing Option Boards
320_assembly_tech_pubs_3-2.wmf
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