Cisco Systems Cisco CRS-1 manual Bring Down All Power to the Chassis

Chapter 2 Installing and Removing Power Components

Removing a DC Power Shelf

Steps

To remove the DC power shelf, follow these steps:

Step 1 Attach the ESD-preventive wrist strap to your wrist and connect its leash to one of the ESD connection sockets on the front (PLIM) side of the chassis or a bare metal surface on the chassis.

Bring Down All Power to the Chassis

Step 2 Power down the chassis:

a.Go to the rear of the chassis. On the PIM, toggle both power shelf enable switches to OFF (see Figure 2-14).

Now the system’s boards and fans have no power.

Figure 2-14 DC Power Shelf Enable Switches

+ (RTN)

B1	–
	(-
	48V/-60V)

+ (RTN)

S

STATU

S

STATU

S

STATU

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

S

STATU

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

210861

1

1

DC power shelf enable switches

b.Unplug the DC power supplies.

c.Disconnect input power from the customer source.

Step 3 Remove both wiring block covers (see Figure 2-15).

a.Use a number 1 Phillips screwdriver to loosen the capture screw.

b.Snap off the cover over the wiring block.

Disconnect the Input Power Cables and Grounding Cable

Step 4 Use a 10 mm hex socket wrench to disconnect the DC input power cables.

Disconnect the four 60A DC cables (two cables per input) on the left from one wiring block, and the four 60A DC cables on the right from the other wiring block (see Figure 2-15).

Step 5 Use a 10 mm hex socket wrench to disconnect the grounding cable (see Figure 2-15).

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