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Installing a DC Power Supply
Installing a DC Power Supply
You can replace one power supply while the other one provides power to the switch.
Before you begin
• The circuit breaker for the DC power source for the power supply must be turned off.
• The power supply that you are installing must be capable of using the same airflow direction as the fan
• A DC power source must be within reach of the power cable that will be used with the replacement power
• There must be an earth ground connection to the chassis that you are installing the replacement module.
• 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
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 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.
If the power supply does not fit into the open slot, turn the module over before carefully sliding it into the open
Note
slot.
Step 2
If the DC power cables and a grounding cable are already connected to an electrical connector block, insert the block
into the power receptacle on the power supply.
Step 3
Turn on the circuit breaker for the DC power source connected to the power supply.
Step 4
Verify that the power supply is operational by making sure that the power supply LED is green.
Connecting a Power Cable to an NXA-PDC-930W Power Supply
You must connect the ground, negative, and positive DC power cables to a connector block in order to connect
the power cables to a 48 V DC power supply.
Note
The recommended wire gauge is 8 AWG. The minimum wire gauge is 10 AWG.
Cisco Nexus 93180YC-FX3S NX-OS Mode Switch Hardware Installation Guide
36
trays installed in the same switch
supply. If you are using n+n power redundancy, there must be a separate power source for each power
supply installed in the chassis (do not mix AC and DC power sources for the same switch). Otherwise,
only one power source is required.
Typically, the chassis is grounded by its metal-to-metal connection to a grounded rack. If you need to
ground this chassis by another means, see
(+) 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.
Grounding the Chassis, on page
Replacing Components
20.
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