•
For a 3-kW power supply, the release latch on the front of the power supply clicks and prevents you
from moving the power supply in or out of the chassis. This action completes the mounting of the
power supply on this chassis.
•
For a 3.5-kW power supply, the built-in latch secures the power cable to the power supply.
What to Do Next
•
For an AC and HVAC/HVDC (when used with an input AC source) power supply, you must connect
it to an AC power source (see the
Connecting a 3-kW AC Power Supply to AC Power Sources
and
Connecting a 3.5-kW HVAC/HVDC Power Supply to AC Power Sources
topic). The power supply will
be automatically grounded through its power cable.
•
For a 3-kW DC power supply, you must connect the power supply to the DC power source (see the
“
Connecting a DC Power Supply to DC Power Sources
”
topic).
Connecting a 3-kW AC Power Supply to AC Power Sources
You use one power cord to connect a 3-kW 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, 6, 9, 10, 13, and
14) are connected to one grid and that the power supplies on the right side of the chassis(slots 3, 4, 7,
8, 11, 12, 15, and 16) are connected to the other grid.
Before You Begin
Before you connect power supplies to one or two power sources, ensure all of the following:
•
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
Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide
126
OL-30453-01
Installing or Replacing Modules, Fan Trays, and Power Supplies
Connecting a 3-kW AC Power Supply to AC Power Sources