Cisco Systems Cisco CRS-1 manual Connecting the Grounding Cable and Power Input Cables

Chapter 2 Installing and Removing Power Components

Installing a DC Power Shelf

Figure 2-10 Power Shelf Coupling Screw

S

STATU

S

STATU

S

STATU

S

STATU

+	B1	–
(RTN)	(-		+	B0
		48V/-60V)			–
			(RTN)	(-
					48V/-60V)
					ON	SIDE B
					B1 B0

B	SIDE A		+	A1	–
Side		ON	(RTN)	(-		+	A0
					48V/-60V)			48V/-60V)
						(RTN)	(-
		A1 A0						–
	A
	Side

12

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1

Power shelf coupling screw

2

Ground lug nuts

Connecting the Grounding Cable and Power Input Cables

Step 10 On the PIM, use a 10 mm hex socket wrench to connect the grounding cable (see item 2 in Figure 2-10).

Note When wiring the power shelf, be sure to attach the ground wire first. When removing the wiring, be sure to remove the ground wire last. The ground wire must be attached with a torque value of 30 in-lb.

Step 11 On the PIM, use a 10 mm hex socket wrench to hook up the DC input power cables. Connect the four 60A DC cables (two cables per input) on the left to one wiring block, and the four 60A DC cables on the right to the other wiring block (see Figure 2-11).

Note The DC input power cables should also be attached with a torque value of 30 in-lb.

Color Coding of the Source DC Power Cable. The color coding of the source DC power cable leads depends on the color coding of the site’s DC power source. Typically, green or green and yellow indicates that the cable is a ground cable. Because no color code standard exists for the source DC wiring, you must ensure that the power cables are connected to the DC-input power shelf terminal studs in the proper positive (+) polarity and negative (–) polarity.

DC Cable Polarity Labels. Sometimes, the source DC cable leads might have a positive (+) or a negative (–) label. This label is a relatively safe indication of the polarity, but you must verify the polarity by measuring the voltage between the DC cable leads. When making the measurement, the positive (+) lead and the negative (–) lead must always match the (+) and (–) labels on the power shelf.

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