10-10
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
OL-23069-07
Chapter 10 Installing or Replacing Components
Replacing a DC Power Supply Unit During Operations
Warning
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
Step 6 Detach each set of four DC power cables from the DC power source or DC power interface unit (PIU)
as follows:
Warning
Hazardous voltage or energy may be present on DC power terminals. Always replace cover when
terminals are not in service. Be sure uninsulated conductors are not accessible when cover is in
place.
Statement 1075
a. Unscrew the three screws on top of the terminal box located on the front of the power supply, and
remove the safety cover.
b. Unscrew the two nuts holding each cable lug, remove the lug, and refasten the two nuts. This action
releases four cables from the power supply.
c. Place the safety cover on the terminal box and fasten with three screws.
Step 7 Press and hold the release latch on the front of the power supply and then pull the power supply part way
out of the chassis by its handle.
Step 8 Place your other hand under the power supply, fully pull it out of the chassis, and place it in its shipping
materials.
Step 9 Either replace the power supply unit or cover the empty power supply bay as follows:
• If you are ready to replace the power supply unit, see the “Installing a 3-kW DC Power Supply Unit
During Operations” section on page 10-10.
• If the power supply bay is to remain empty, install a blank power supply filler plate (Cisco part
number 800-37248-01) over the opening, and secure it with its captive screws.
Installing a 3-kW DC Power Supply Unit During Operations
After you remove a 3-kW DC power supply, you can replace it with another AC or DC power supply or
replace it with a blank plate until another power supply is available. To install an AC power supply unit,
see the “Installing a 3-kW AC Power Supply Unit During Operations” section on page 10-3.
Warning
Hazardous voltage or energy is present on the backplane when the system is operating. Use caution
when servicing.
Statement 1034
To install a 3-kW DC power supply unit while a Cisco Nexus 7000 Series switch is operating, follow
these steps:
Step 1 If you have not already done so, unpack the replacement DC power supply unit and place it on an
antistatic mat.
Step 2 Ensure that the power switch on the replacement DC power supply unit is in the standby (0) position.
Step 3 Ensure that the DC power source for the new power supply unit is turned off at the circuit breaker.
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