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Installing or Replacing a Power Supply in a Switch Chassis
b) Press the bottom of the fan tray into the slot so that the electrical connectors at the bottom of the module
are inserted into the connectors inside the slot.
c) Press the whole fan tray into the slot so that the front of the fan tray is touching the outer surface of the
chassis and the four captive screws on the module are aligned to four screw holes in the chassis.
d) With the electrical contacts on the fan tray aligned to contacts on the back plane, press the fan tray fully
into the slot.
The front of the fan tray should be even with the fronts of the other fan trays and the four captive screws
on the fan tray should be aligned to four screw holes in the chassis.
e) Screw in each of the four captive screws on the front of the fan tray to secure the fan tray to the chassis.
Tighten each screw to 8 in-lb (0.9 N·m) of torque.
f) Verify that the Status LED is green. For more information about the LED states, see
on page
Installing or Replacing a Power Supply in a Switch Chassis
You can install up to 16 power supplies of the following types:
• 3-kW AC power supply (N77-AC-3KW)
• 3-kW DC power supply (N77-DC-3KW)
• 3.5-kW HVAC/HVDC power supply (N77-HV-3.5KW)
If you leave any power supply slots empty, you must install a blank filler plate (N77-3KPS-BLANK-H=) in
that slot to maintain the designed airflow.
The chassis ships with power supplies already installed but you can optionally remove the power supplies
Note
to make the chassis lighter for the installation.
You follow the same steps to install AC, DC and HVAC/HVDC power supplies into the switch, but you
ground them differently. For an AC and HVAC/HVDC power supply, you automatically ground it when you
connect its power cable to the power supply and the power source. For a 3-kW DC power supply, you do not
directly connect the power supply to the earth ground.
Before You Begin
• The switch chassis must be installed in a cabinet or rack that is secured to the data center.
You need the following additional tools and equipment:
• Nut driver attachment for Number 1 Phillips-head screwdriver or ratchet wrench with torque capability
• Crimping tool
• For 3-kW DC power supplies, you need four power cables sized to reach the DC power source or power
Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide
124
194.
(used only for DC power supplies)
interface unit (PIU)
Installing or Replacing Modules, Fan Trays, and Power Supplies
I/O Module LEDs,
OL-30453-01
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