ADC Network Unit User Manual download pdf (Page 15)

August 7, 2006 Chapter 2: Installation

AIWN-UM-7001-01 2-3

Power Connection

Following local practices, attach two pair of power supply wires from two separate power sources to the four pin

power plug (pair 1: -48 VDC-A, RETURN-A and pair 2: -48 VDC-B, RETURN-B) on the chassis backplane (see

Figure 2-3 for details).

Figure 2-3. Four-Pin Power Plug Wiring Diagram

Separately fuse each -48 VDC power source, but do not install fuses now. Recommended wire size is 20 AWG

(0.8 mm). This recommendation applies to wiring from the ENIU to a fuse panel using solid conductors. Fuse size

should not exceed recommendation (see Appendix A: Specifications for fuse size). Plug the power plug into the

power connector located on the back of the ENIU.

Step Action

1 Using AWG 16 (1.25mm) solid copper wire, connect one end of the ground wire to the ground stud at the

back of the ENIU (shown in Figure 2-2 on page 2-3). Tighten the stud nut to 15 pound-force inches (1.7

Newton meters) of torque.

2 To assure proper operation, the ground stud must be connected to a good earth ground.

3 Connect the other end of the ground wire to the office ground conductor. Ensure this connection is made

using methods and hardware that meets all applicable local and national electrical codes.

Figure 2-2. ENIU Rear View with RJ-45 Connector

20382-A

RETURN-A

-48 VDC-A

RETURN-B

-48 VDC-B

RTN RTN-48 VDC -48 VDC

20477-A

POWER SOURCE

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 35 36

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ADC Network Unit User Manual Page 15