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Installing or Replacing Modules, Fan Trays, and Power Supplies
Warning
Statement 1018
Warning
250V, 20 A
Statement 1005
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
Note
If the Fault LED is flashing red, turn the power switch to standby (labeled as 0), check the 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 DC Power Supplies with Power Sources
Connect each installed DC power supply with a DC power circuit as follows:
Note
If you are using combined power mode (no power redundancy) or power supply (n+1) power mode,
connect all of the power supplies to the same power circuit (grid).
If you are using input source (n+n) or full power mode, connect half of the power supplies (located in
slots 1, 2, 5, 6, 9, 10, 13, and 14) to one AC power circuit and the other half of the power supplies (located
in slots 3, 4, 7, 8, 11, 12, 15, and 16) to another AC power circuit.
Before You Begin
• The power supplies are installed in the chassis.
• A DC power source is within reach of power cables that will be attached to the power supplies.
• Power cables are available to connect each DC power supply to the DC power source.
Procedure
Step 1
Turn the power switch to standby (labeled 0 on the power switch).
Step 2
Turn off the power at the circuit breakers for the portions of the DC grid power that you are connecting to
and verify that all of the LEDs on the power supplies are off.
Warning
Statement 1003
OL-30453-01
Take care when connecting units to the supply circuit so that wiring is not overloaded.
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure
that the protective device is rated not greater than:
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.
Before performing any of the following procedures, ensure that power is removed from the DC
circuit.
Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide
Connecting DC Power Supplies with Power Sources
Power Supply LEDs
129
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