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
To reduce risk of electric shock and fire, take care when connecting units to the supply circuit so that wiring
is not overloaded.
Warning
Statement 1018
This product relies on the building’s installation for short-circuit (overcurrent) protection. To reduce risk of
electric shock or fire, ensure that the protective device is rated not greater than:
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
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
of the power supplies to one AC power source or you connect half of the power supplies to one AC power
source and the other half to another AC power source:
• For combined power mode (no power redundancy), you need enough power supplies to power all switch
operations and connect all of the power supplies to the same AC power source. You can install the power
supplies in any open power supply slot in the chassis.
• For power supply redundancy mode (
n
+1 redundancy mode), you need enough power supplies to power
all switch operations and one extra power supply that can replace a failing power supply. You connect
all power supplies to the same AC power source. You can install the power supplies in any open power
supply slot in the chassis.
• For input source redundancy (grid redundancy) mode or full redundancy mode, you need twice the
number of power supplies needed to power the switch operations. You connect half of the power supplies
to one power source for active power and the other half to another power source for redundant power.
You must ensure that the power supplies on the left side of the chassis (slots 1, 2, 5, and 6) are connected
to one grid and that the power supplies on the right side of the chassis(slots 3, 4, 7, and 8) are connected
to the other grid.
Cisco Nexus 7710 Switch Site Preparation and Hardware Installation Guide
133
OL-30452-01.
Installing or Replacing Modules, Fan Trays, and Power Supplies
Connecting a 3.5-kW HVAC/HVDC Power Supply to AC Power Sources
