Replacing A Dc Power Supply Unit During Operations; Removing A 3-Kw Dc Power Supply Unit During Operations - Cisco Nexus 7000 Hardware Installation And Reference Manual

Chapter 10 Installing or Replacing Components

Replacing a DC Power Supply Unit During Operations

The Cisco Nexus 7000 Series switches use a load-balanced power supply that uses up to three or four
AC or DC power supply units. If you can set one power supply unit in standby mode and have the
required power load balanced by the remaining online power supply units, then you can replace the
standby power supply unit with another power supply unit without interrupting system operations.
Note If a replacement power supply unit is not available and you do not have a blank plate to cover the empty
power supply bay, you should leave the original power supply in the bay until you have the replacement
unit.
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.
Statement 1029
This section describes how to replace a DC power supply unit and includes the following topics:
•
•
•
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Removing a 3-kW DC Power Supply Unit During Operations

You can remove a DC power supply during operations if the power supply is redundant and you can shut
off the power from the grid without shutting off power to the other needed power supplies.
Hazardous voltage or energy is present on the backplane when the system is operating. Use caution
Warning
when servicing. Statement 1034
To replace a DC power supply unit while a Cisco Nexus 7000 Series switch is operating, follow these
steps:
Unpack the new power supply and keep its shipping materials so that you can use them to pack the old
Step 1
power supply.
Make sure that the power supply units not being replaced have their power switches turned on (labelled
Step 2
as 1).
For the power supply unit that you are replacing, turn its power switch to standby (labelled as 0). The
Step 3
Output LED turns off.
Turn off the DC input power by manually turning off the input circuit at the circuit breaker for this power
Step 4
supply.
Step 5 Verify that the input power is completely off by making sure that all of the LEDs on the DC power supply
unit are off.
OL-23069-07
Removing a 3-kW DC Power Supply Unit During Operations, page 10-9
Installing a 3-kW DC Power Supply Unit During Operations, page 10-10
Removing a 6-kW DC Power Supply Unit During Operations, page 10-12
Installing a 6-kW DC Power Supply Unit During Operations, page 10-14
Replacing a DC Power Supply Unit During Operations
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
10-9