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Replacing a DC Power Supply
Before you begin
•
Note
• An DC power source must be within reach of the power cables that will be used with the replacement
• There must be an earth ground connection to the chassis in which you are installing the replacement
• We recommend 8-AWG wire for DC installation in the U.S.
• All DC power supplies have reverse polarity protection. When you inadvertently connect the input power
Step 1
Remove a DC power supply as follows:
a) Turn off the circuit breaker for the power feed to the power supply that you are replacing.
Be sure that the LEDs turn off on the power supply that you are removing.
b) Remove the DC power connector block from the power supply by doing the following:
1. Push the orange plastic button on the top of the connector block inward toward the power supply.
2. Pull the connector block out of the power supply.
c) Grasp the power supply handle while pressing the release latch towards the power supply handle.
d) Place your other hand under the power supply to support it while you slide it out of the chassis.
Caution
Step 2
Install the replacement power supply as follows:
a) Holding the replacement power supply with one hand underneath the module and the other hand holding the handle,
turn the power supply so that its release latch is on the right side and align the back end of the power supply (the end
with the electrical connections) to the open power supply slot before carefully sliding the power supply all the way
into the slot until it clicks into place.
Note
b) Test the installation by trying to pull the power supply out of the slot without using the release latch.
Cisco Nexus 93108TC-FX3 ACI-Mode Switch Hardware Installation Guide
42
You can determine the airflow direction by looking at the coloring of the latch
on each power supply. AC power supplies with burgundy latches have port-side
intake airflow direction, and power supplies with blue latches have port-side
exhaust airflow direction.
power supply. If you are using n+n power redundancy, there must be a separate power source for each
power supply installed in the chassis.
power supply. If the switch is mounted properly in a grounded rack then there is no need to ground the
PSU. Some DC power supplies connected to DC power sources have three power cables (two for DC
power and one for grounding). Some, like the (NXA-PDC-1100W) only have two power cables (both
for DC power).
(+) to the DC PSU's – terminal and the input power – to the DC PSU's (+) terminal, the PSU will not
be damaged and will operate fine after the input power feeds are correctly wired.
Do not touch the electrical connections on the back side of the module and prevent anything else from
coming into contact with and damaging the connectors.
If the power supply does not fit into the open slot, turn the module over before sliding it carefully into
the open slot.
Replacing Components
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