Cisco UBR7246VXR Hardware Installation - Page 16

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DC Power Supplies

Warning

Before performing any of the following procedures, ensure that power is removed from the DC circuit. Statement

1003

Warning

When installing or replacing the unit, the ground connection must always be made first and disconnected last.

Statement 1046

Warning

A readily accessible two-poled disconnect device must be incorporated in the fixed wiring. Statement 1022

Note

The color-coding of the DC-input power supply leads depends on the color-coding of the DC power source at your site.

Typically, green or green/yellow is used for ground, black is used for +48V (return), and red or white is used for –48V.

Make certain that the lead color-coding you choose for the DC-input power supply matches lead color-coding used at

the DC power source.

Tools

• 8-mm wrench or nut driver, or adjustable wrench (for connecting a grounding lug to a DC-input power supply only)

• 7-mm wrench or nut driver, or adjustable wrench (for connecting the DC-input power lead strain-relief cover to a DC-input

power supply only)

• 14 AWG (2.08 mm

) cable with a minimum of three conductors rated for at least 140 ˚ F (60˚ C) (for DC-input power supply

installations only)

• Standard wire stripper

Step 1

Ensure that the –48V and +48V leads are disconnected from the power source.

Step 2

At the rear of the router, check that the power switch on the power supply is in the OFF (0) position.

Step 3

Connect the two-hole grounding lug on the ground wire to the M5 grounding receptacles with the two M5 nuts. Tighten

the nuts using an 8-mm wrench or nut driver (or adjustable wrench). See Figure 12.

Step 4

Using a wire stripper, strip approximately 0.55 inch (14 mm) from the –48V and +48V leads.

Step 5

Insert the stripped end of the +48V lead all the way into the +48V lead receptacle and tighten the receptacle screw using

a 3/16-inch flat-blade screwdriver. Repeat for the –48V lead.

Step 6

Make sure that the entire stripped end of each lead is inserted all the way into its receptacle. If any exposed wire at the

stripped end of a lead is visible after inserting the lead into its receptacle, remove the lead from the receptacle, use the

wire stripper to cut the stripped end of the lead, and repeat Step 4 and Step 5.

Step 7

After tightening the receptacle screws and nuts for the ground, +48V, and –48V DC-input leads, run the +48V and –48V

leads between the two strain-relief studs on the power supply faceplate. (See Figure 12 on page 17.)

Step 8

Install the strain-relief cover over the +48V and –48V leads and secure the cover to the strain-relief studs using the two

M4 nuts with a 7-mm wrench or nut driver (or adjustable wrench). (See Figure 12.)

Step 9

Connect the ground wire, +48V lead, and –48V lead to the power source.

Caution

Each DC-input power supply has an electrical current rating of 14 A, 700 VA. Use a minimum of 14 AWG

(2.08 mm

) wire for the input to each DC-input power supply. The power input must be protected by a 20 A circuit

breaker or fuse that is in compliance with your local electric regulations.