Cisco Nexus 7000 Hardware Installation And Reference Manual page 184

Connecting a DC Power Supply to DC Power Sources
Attach the negative cables to the negative terminals of a DC power source, and attach the positive
b.
cables to the positive terminals of the DC power source. Depending on whether you need input
source redundancy, connect these cables to one or two power sources as follows:
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Step 8 For the powered down circuits connected to the power supplies, turn on the power at the circuit breaker.
The Input LEDs turn on each connected power supply.
Step 9 Turn the power switch on the connected DC power supplies from standby (labelled as STBY or 0) to on
(labelled as ON or 1). The LEDs should flash and then the Output LEDs should turn on in addition to
the Input LEDs.
If the FAULT LED is lit or flashing, call Cisco TAC for assistance.
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
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For combined power mode or power supply redundancy modes, connect all DC power supply
cables to one DC power source.
For input source redundancy mode or full redundancy mode with a 3-kW DC power supply,
connect the power cables for half of the power supplies to one DC power source and connect
the power cables for the other half of the power supplies to another DC power source.
For input source redundancy mode or full redundancy mode with a 6-kW DC power supply,
connect the four power cables connected to the top power plug on the power supply to one DC
power source and connect the four power cables for the bottom power plug on the power supply
to another DC power source.
Chapter 6 Installing Power Supplies
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