Cisco Systems Cisco CRS-1 manual Wiring Block on the PIM, Input line current, Inrush current

Chapter 2 Installing and Removing Power Components

DC Power Systems on the Cisco CRS-1 4-Slot Router

Table 2-1 DC Input Current and Voltage Information

Nominal input voltage Supports -48 VDC and -60 VDC systems (range: –40 to –72 VDC)

	Note The turn-onvoltage of the DC power supplies
		is -43.5 +/- 0.5 VDC. When a power supply is
		powered on, it continues to operate down to an
		input voltage of -40 VDC.
Input line current	50-A maximum at –48 VDC
	40-A maximum at –60 VDC
Inrush current	60-A peak at -75 VDC
	(maximum for 1 ms)

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

Wiring Block on the PIM

Each wiring block on the power input module (PIM) contains four sets of terminals, two positive and two negative (see Figure 2-5). Each wiring block is covered by a plastic block cover that snaps onto the wiring block and is secured by a screw to a torque value of 50 in.-lb.

You must remove the block cover before you work with the wires.

Figure 2-5 Power Input Module (PIM)

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

	ON	SIDE B
B1	B0

Side B

12

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

A	A1	A0
Side

3

4 5

6

210614

1	Power supply B1 wiring block	4	Power supply A1 wiring block
2	Power supply B0 wiring block	5	Power supply A0 wiring block
3	Power shelf coupling screw	6	Ground lug nuts

Cisco CRS-1 Carrier Routing System 4-Slot Line Card Chassis Installation Guide

2-8 OL-10971-07