Cisco Systems N3KC3524P10G manual 331410

Chapter 2 Installing the Cisco Nexus 3000 Series Switches

Starting the Switch

Se n d d o c u m e n t c o m m e n t s t o n ex u s 3 k - d o c f e e d b a ck @ c i sc o . c o m

Step 5 If you are installing a switch with a DC power supply, connect the power supply to a DC power source as follows:

a.Verify that the DC power source is turned off at the circuit breaker.

b.Remove the clear plastic safety cover that prevents you from touching the negative (-) and positive

(+) terminals on the power supply.

c.Determine whether the terminals are correctly labeled. As shown in Figure 2-8, the correct labeling of the terminals is with – (negative polarity) on the left and + (positive polarity) on the right (see Callouts 1 and 2), and the incorrect labeling is with + on the left and – on the right (see Callouts 3 and 4).

Note All DC power supplies have negative polarity on the left terminal and positive polarity on the right terminal but early manufactured versions of these power supplies were labeled with + on the left and – on the right.

Figure 2-8 Polarity Labeling of DC Power Supply Terminals (Current and Early Labeling)

	3
1	4
	2

			331410
1	On newer power supplies, the left terminal is	3	On the originally released power supplies, the
	labeled for negative polarity. Connect the		left terminal has negative polarity but is
	negative cable to this left-side terminal.		labeled as +. Connect the negative cable to
			this left-side terminal.
2	On newer power supplies, the right terminal is	4	On the originally released power supplies, the
	labeled for positive polarity. Connect the		right terminal has positive polarity but is
	positive cable to this right-side terminal.		labeled as –. Connect the positive cable to this
			right-side terminal.

d.Connect a negative cable from the power source to the left terminal (is labeled - on newer power supplies [see Callout 1 in Figure 2-8] and + on the first power supplies sold [see Callout 3 in Figure 2-8]) on the power supply and fasten with the screw for that terminal.

	Cisco Nexus 3000 Series Hardware Installation Guide
2-18	OL-25338-04