Emerson Model M250N Mounting of Rack Mount Enclosure

Network Master Mounting

If the system is supplied from the factory in an NEMA enclosure, no internal wiring

is required except for connecting power and field network wiring. The next three

sections (Sections 2.1. 2.2 and 2.3) discuss mounting, power input and field network

wire connections to the NIM.

Mounting of NEMA Enclosure

The enclosure is rated for NAMA 4/12 and IP65/IP55. Dimensions of the enclosure are shown

in Figure 5. Mounting dimensions are shown in Figure 6. The enclosure may be bulkhead

mounted using the internal mounting holes. External mounting brackets may be used if

desired. When mounting using the internal mounting holes, caution must be used to ensure

the holes are sealed to maintain the NEMA/IP rating. The enclosure is supplied with five 1/2 in.

compression type cable entry hubs. These may be fitted with conduit type fittings if desired.

If the system includes backup LCD keypad terminal, some planning is required to allow for

proper height above the floor to view the display and properly operate the keypad.

Mounting of Rack Mount Enclosure

The enclosure is designed for standard EIA 19 in. DIN rail rack mounting. Dimensions of the

enclosure are shown in Figure 7. The enclosure conforms to EIA RS-310. IEC 297-1. and DIN 41

494. Part 1 standards. The rack in which the enclosure(s) are mounted must allow a minimum

of 20 in. / 508 mm depth, allowing space for cable connections. If the system includes backup

LCD keypad terminals, some planning is required to allow for proper height above the floor to

view the display and operate the keypad properly.