•
You have receptacles for one or two AC power sources within reach of the power supply cables. The
number of power sources depends on the power mode to be used for the switch.
◦
Combined power (no power redundancy)
—
One AC power source
◦
Power supply redundancy (
n
+1 redundancy)
—
One AC power source
◦
Input source redundancy (power-grid redundancy)
—
Two AC power sources
◦
Full redundancy
—
Two AC power sources
•
The AC power sources are rated as follows:
◦
For North American installations
—
20A with 110V or 220V circuits.
◦
For international installations
—
size the circuits by local and national standards.
•
The power supply is already installed in the chassis.
•
The chassis is connected to an earth ground.
Step 1
Ensure that the power supply switch located on the front of the power supply is set at standby (labeled as 0).
Step 2
Plug one AC power cable into the power supply, and pull down the retention clip over the plug on the power cable.
Step 3
Plug the other end of the power cable into a AC power source supplied by the data center.
If you are using the combined power mode or power supply redundancy, you connect the power cables to the
same 20-A circuit. If you are using the input source redundancy mode or full redundancy mode, you connect
half of the power cables to one AC power source and the other half to another AC power source.
Note
Take care when connecting units to the supply circuit so that wiring is not overloaded.
Warning
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the
protective device is rated not greater than:
Warning
250V, 20 A
Step 4
Turn the power supply switch from standby to on (from 0 to 1 as labeled on the power switch).
Step 5
Verify that the power supply is receiving AC power and outputting DC power by making sure that the INPUT and
OUTPUT power supply LEDs are lit and the FAULT LED is not lit or flashing. For an explanation of all the power
supply LEDs and the conditions that they indicate, see
When you first activate the power supply, you can verify the functionality of the LEDs by checking that each
LED turns on for a couple of seconds.
Note
If the Fault LED is flashing red, turn the power switch to standby (labeled as 0), check the AC power connections on
the power supply and the AC power source, and then turn the power switch back on (labeled as 1). The Input and Output
LEDs for the connected power supplies should be green and the Fault LED should be off.
Connecting a 3.5-kW HVAC/HVDC Power Supply to AC Power Sources
You use one power cord to connect a 3.5-kW HVAC/HVDC power supply to its AC power source and to
ground the power supply. Depending on the power mode that you use for the switch, you either connect all
Cisco Nexus 7702 Hardware Installation Guide
68
Installing or Replacing Modules, Fan Trays, and Power Supplies
Connecting a 3.5-kW HVAC/HVDC Power Supply to AC Power Sources
