Replacing Components

Replacing a Fan Module

You can replace a fan module while the switch is operating so long as you perform the replacement within one minute. If you cannot perform the replacement within one minute, leave the original fan module in the chassis to maintain the designed airflow until you have the replacement fan module on hand and can perform the replacement.


Caution

If you are replacing a module during operations, be sure that the replacement fan module has the correct direction of airflow, which means that it has the same airflow direction as the other modules in the chassis. Also, be sure that the airflow direction takes in air from a cold aisle and exhausts to a hot aisle. Otherwise, the switch can overheat and shutdown.

If you are changing the airflow direction of all the modules in the chassis, you must shutdown the switch before replacing all the fan and power supply modules with modules using the other airflow direction. During operations, all of the modules must have the same direction of airflow.

Removing a Fan Module


Warning

Statement 263—Fan Warning

The fans might still be turning when you remove the fan assembly from the chassis. Keep fingers, screwdrivers, and other objects away from the openings in the fan assembly's housing.

Procedure

Step 1

On the fan module that you are removing, press the two sides of the fan module handle next to where it connects to the fan module and pull on the handles enough to unseat it from its connectors.

Step 2

Holding the handle, pull the module out of the chassis.

Caution 

Do not touch the electrical connectors on the back side of the module and prevent anything else from coming into contact with and damaging the connectors.

Installing a Fan Module

Before you begin

  • A fan slot must be open and ready for the new fan module to be installed.

  • You must have a new fan module on hand and ready to install within one minute of removing the original fan module if the switch is operating.

  • The new fan module must have the same airflow direction as the other fan and power supply modules installed in the switch.

Procedure

Step 1

Holding the fan module by its handle, align the back of the fan module (the side with the electrical connectors) to the open fan slot in the chassis.

Step 2

Slide the fan module into the slot until it clicks in place.

Step 3

Verify that the Status (STS) LED turns on and becomes green.

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 and the same wattage rating 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.

Removing an AC Power Supply

To remove an AC power supply, you must first disconnect the power cable and then remove the module from the chassis.

Before you begin

  • To replace a power supply during operations, you must have a functioning power supply providing power to the switch while you replace the other power supply. If there is only one power supply installed in the switch and you need to replace it, install the new power supply in the open slot and power it up before removing the original power supply.

  • Ensure that the chassis is grounded. For grounding instructions, see Grounding the Chassis.

Procedure

Step 1

Pull the power cord out from the power receptacle on the power supply to be removed and verify that the LED turns off.

Note 

The LED might be on and amber colored to indicate that the input power has been disconnected.

Step 2

Remove the power supply from the chassis by pushing and holding its thumb latch to the left and pulling the power supply part way out of the chassis.

Step 3

Place your other hand under the power supply to support it while you slide it out of the chassis.

Either place the power supply on an antistatic surface or pack it in its packing materials.

Step 4

If the power supply slot is to remain empty, install a blank power supply filler panel (part number N2200-P-BLNK).

What to do next

You are ready to install the replacement power supply.

Removing a DC Power Supply

You can remove one power supply while the other one provides power to the switch.

To disconnect the power supply from its power cables, you must shut off the power from the power source and then disconnect the connector for the power cables.

Procedure

Step 1

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.

Step 2

Remove the power cable from the power supply by doing the following:

    Step 3

    Grasp the power supply handle while pressing the release latch towards the power supply handle.

    Step 4

    Pull the power supply out of the bay.

    What to do next

    You are ready to install a DC power supply in the open slot.

    Installing an AC Power Supply

    You can replace one power supply while the other one provides power to the switch.

    Before you begin

    • The power supply that you are installing must be capable of using the same airflow direction as the fan trays installed in the same switch and it must use the same type of power source as the other power supply installed in the same switch (do not mix AC and DC power supplies in the same switch).


      Note

      If the power supply that you are replacing has a different color handle than the replacement power supply, verify that it has or will have the same airflow direction as the other modules in the switch.

    • 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. Otherwise, only one power source is required.

    • There must be an earth ground connection to the chassis that you are installing the replacement module. Typically, the chassis is grounded by its metal-to-metal connection with a grounded rack. If you need to ground the chassis, see Grounding the Chassis.

    Procedure

    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.

    Note 

    If the power supply does not fit into the open slot, turn the module over before sliding it carefully into the open slot.

    Step 2

    Test the installation by trying to pull the power supply out of the slot without using the release latch.

    If the power supply does not move out of place, it is secured in the slot. If the power supply moves, carefully press it all the way into the slot until it clicks in place.

    Step 3

    Attach the power cable to the electrical outlet on the front of the power supply.

    Step 4

    Make sure that the other end of the power cable is attached to the appropriate power source for the power supply.

    Note 

    Depending on the outlet receptacle on your power distribution unit, you might need the optional jumper cable to connect the switch to your outlet receptacle.

    Step 5

    Verify that the power supply is operational by making sure that the power supply LED is green.

    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 trays installed in the same switch

    • A DC 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 (do not mix AC and DC power sources for the same switch). Otherwise, only one power source is required.

    • There must be an earth ground connection to the chassis that you are installing the replacement module. 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 Grounding the Chassis.

    • 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 (+) 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

    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.

    Note 

    If the power supply does not fit into the open slot, turn the module over before carefully sliding it into the open 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.


    Warning

    Statement 342—Before Connecting to System Power Supply

    High touch/leakage current – Permanently connected protective earth ground is essential before connecting to system power supply.


    Warning

    Statement 1024—Ground Conductor

    This equipment must be grounded. To reduce the risk of electric shock, never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available.

    Before you begin

    You must turn off the circuit breaker for the DC power cables that you are connecting to prevent electrocution.

    Procedure
    Step 1

    Verify that the circuit breaker for the power feed to the replacement power supply is turned off.

    Step 2

    Orient the connector as shown in the following figure.

    1

    Power supply clip

    2

    Connector clip

    3

    Connector clip release tab
    Step 3

    Insert the connector into the power supply, until the connector clip engages with the power supply clip and is fully inserted.

    Step 4

    Verify that the other ends of the cables are attached to the DC power source and ground.

    Step 5

    Turn on the circuit breaker
    Step 6

    You are now ready to turn on the DC power source.