Cisco Nexus 7000 Series - Page 150

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5-18
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
OL-23069-06
Chapter 5 Installing Power Supply Units
Connecting a DC Power Supply Unit to DC Power Sources
b. Remove the 16 nuts from the 16 posts.
c. Attach two negative input lugs to the negative posts on the front side of the PIU (see callout 2 in
Figure 5-12).
d. Attach two positive input lugs to the positive posts on the front side of the PIU (see callout 3 in
Figure 5-12).
e. Fasten each of the four lugs with two M6 nuts and tighten to 40 in-lb (4.5 N·m) (see callout 4 in
Figure 5-12).
Step 7 Connect a power cable with two isolated inputs to the power source.
Step 8 If you are using two power cables, connect each power cable to the same or separate power sources as
follows:
• For 6 kW of output power, you can connect the cables to the same power source.
• For 3 kW of output power and 3-kW redundancy, connect each cable to a separate power source.
Note Be sure to consistently use one input color for negative connections and another input color for
positive connections.
Step 9 For each power cable coming from a power source, connect it to the PIU as follows:
a. Attach two negative input lugs to the negative posts on the rear side of the PIU (see callout 1 in
Figure 5-13).
1 Remove the cover. 3 Place the positive power supply unit cable
lugs (2) on the front positive posts.
2 Place the negative power supply unit cable
lugs (2) on the front negative posts. Use one
color for negative cables and another color for
positive cables.
4 Fasten all four lugs with eight M6 nuts and
tighten to 40 in-lb (4.5 N·m).