Cisco Nexus 9396PX Hardware Installation Manual page 47

Replacing Modules
Statement 1029—Blank Faceplates and Cover Panels
Warning
Blank faceplates and cover panels serve three important functions: they prevent exposure to hazardous
voltages and currents inside the chassis; they contain electromagnetic interference (EMI) that might disrupt
other equipment; and they direct the flow of cooling air through the chassis. Do not operate the system
unless all cards, faceplates, front covers, and rear covers are in place.
All power supply and fan modules must have the same airflow direction or else the switch can overheat and
shutdown. Each module is color coded to indicate its airflow direction. Modules with a burgundy stripe or
latch handle have port-side intake airflow and must face the hot aisle (DC port-side intake modules have green
latch handles). Modules with a blue stripe or latch handle have a port-side exhaust airflow and must face the
cold aisle.
Before You Begin
Before you can replace a power supply, ensure both of the following conditions exist:
• There is a functioning power supply in the other power supply slot. In order to replace a power supply
• The replacement power supply must have the same airflow direction as the other modules in the chassis.
If you must replace the power supply during operations and both of the above conditions are not met, leave
the power supply that you need to replace in the chassis to preserve the designed airflow until you have the
required power supply.
Step 1
Verify that the power supply that you are not replacing has a lit, green Okay (
(see the following figure for the location of the two LEDs). If you are replacing a power supply during operations, the
other power supply must be providing power without a fault condition or else the chassis might power down when you
remove the other power supply.
during operations, there must be one power supply outputting power to the chassis at all times. The other
power supply can be replaced.
If the other modules have a blue stripe or blue lever, the replacement power supply module must have
a blue lever. If the other modules have a burgundy stripe or burgundy lever, the replacement power
supply module must have a burgundy lever.
Cisco Nexus 9396PX NX-OS-Mode Switch Hardware Installation Guide
Replacing an AC Power Supply
) LED and an unlit Fault ( ) LED
37