Replacing a Power Supply Module
The switch requires two power supplies for redundancy. With one power supply providing the necessary power for operations, you can replace the other power supply during operations so long as the new power supply has the same airflow direction as the other modules in the chassis.
You can replace a power supply with another supported power supply that has the same power source type as the other installed power supply. Additionally, the airflow direction of the power supply must match or conform to the airflow direction of the installed fan modules. For the airflow direction used by the switch, see the coloring of the fan modules.
Replacing an AC Power Supply
You can replace an AC power supply during operations so long as the other power supply provides to the switch.
Before you begin
![]() Note |
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. |
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An AC power source must be within reach of the power cable that will be used with the replacement 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.
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There must be an earth ground connection to the chassis that you are installing the replacement module. AC power supplies connected to AC power sources are automatically grounded through their power cable.
Procedure
Step 1 |
Remove an AC power supply as follows: |
Step 2 |
Install the replacement power supply as follows: |
Replacing a High Voltage (HVAC/HVDC) Power Supply
You can replace an HVACHVDC power supply during operations so long as the other power supply provides power to the switch.
Before you begin
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An HVAC/HVDC power source must be within reach of the power cable that will be used with the replacement 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.
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There must be an earth ground connection to the chassis in which you are installing the replacement power supply. HVAC/HVDC power supplies connected to AC power sources are automatically grounded by their power cable when connected to the power supply and AC power source. HVAC/HVDC power supplies connected to DC power sources have Saf-D-Grid power cables with three connectors on the power source end--you connect one of those connectors to the earth ground.
Procedure
Step 1 |
Remove an HVAC/HVDC power supply as follows: |
Step 2 |
Install the replacement power supply as follows: |
Replacing a DC Power Supply
You can replace an DC power supply during operations so long as the other power supply provides power to the switch.
Before you begin
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Note
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.
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An DC power source must be within reach of the power cables that will be used with the replacement 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.
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There must be an earth ground connection to the chassis in which you are installing the replacement 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).
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We recommend 8-AWG wire for DC installation in the U.S.
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All DC power supplies have reverse polarity protection. When you inadvertently connect the input 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.
Procedure
Step 1 |
Remove a DC power supply as follows: |
Step 2 |
Install the replacement power supply as follows: |