NFS2-3030/E Installation Manual — P/N 52544:N1 07/18/2014
23
Attaching the CPU & Chassis
Installation
Options for Mounting Other Equipment
Second, third, and fourth rows of equipment use any chassis compatible with CAB-4 series
backboxes, such as CHS-4N (shipped as part of CHS-4MB) or CHS-4L. Refer to the CAB-3/CAB-4
Series Cabinet Installation Document for a complete list. Some equipment (such as annunciators)
can be door-mounted as shown in Figure 3.9; refer to your equipment’s documentation for
instructions.
Examples of option boards are LCM-320, LEM-320, wire and fiber versions of the NCM and HS-
NCM, TM-4, and DPI-232; see Section 3.6 “Attaching Option Boards”. The documentation
shipped with your equipment may also contain device-specific instructions.
3.5 Attaching the CPU & Chassis
Note for CPU2-3030D.
Due to the difficulty of reaching under the keypad, it may be convenient
to remove the insulator from the lithium memory-backup battery before mounting the CPU into the
chassis. See Section 3.5.4 “Memory-Backup Battery”.
3.5.1 Mounting in CHS-M3
Mount CPU into positions 1 and 2 of CHS-M3 as follows; equipment may be mounted to the
chassis before or after the chassis is mounted in the backbox. Some equipment may be door-
mounted directly in front of the CPU; see Section 3.4 “Laying Out Equipment in Cabinet and
Chassis” and the manual shipped with the other device.
1.
Attach four stand-offs to chassis as shown in Figure 3.5.
CPU2-3030D (with keypad/display) requires the longer stand-offs: 1.5 inch (38.1 mm);
CPU2-3030ND (without keypad/display) requires the shorter stand-offs: 0.25 inch (6.35 mm)
2.
Slide circuit-board tabs into slots on chassis as shown in Figure 3.5.
Layer 4 mounted to
PEM studs and tab-slot
Layer 4 door-mounted*
Layers 1&2&3 mounted to
PEM studs on chassis
Layers 1&2&3 mounted to
PEM studs on chassis
Layers 1&2 mounted to
PEM studs on chassis
Layer 4 mounted to PEM
studs and tab-slot; Layer 3
suspended from Layer 4
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*Note: If CHS-4N is used, door-mounting is only for use with ACM-24AT and ACM-48A series annunciators.
Figure 3.4 Configuring Equipment in Chassis (Side View):
Positions 3 and 4 of CHS-M3, All 4 Positions of CHS-4N
NOTE:
It is recommended that system design take into consideration the UL requirements for
minimum separation of power-limited and non-power-limited wiring; for example, having all non-
power-limited circuits grouped in one area of the cabinet (see Section 3.11 “UL Power-limited
Wiring Requirements” and your power supply manual).
