Replacing Components

Replacing a Fan Module


Caution

Be sure that the replacement fan module has the correct direction of airflow, which means that it has the same color markings as the other fan and power supply modules in the chassis. Otherwise, the switch can overheat and shutdown.

Removing a Fan Module


Note

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.

    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. All of these modules must have either burgundy coloring (port-side intake airflow) or they must all have blue coloring (port-side exhaust airflow).

      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 an AC Power Supply

      You can replace an AC power supply during operations so long as there is another power supply installed and operating during the replacement. The switch requires only one power supply for operations, so you can hot swap the redundant power supply during operations. If there is only one power supply installed in the chassis, you can replace it by installing the new power supply in the open power supply slot before removing the other power supply.


      Warning

      Statement 1034—Backplane Voltage

      Hazardous voltage or energy is present on the backplane when the system is operating. Use caution when servicing


      Caution

      Be sure that the replacement power supply has the correct direction of airflow, which means that it has the same color markings as the other fan trays and AC power supplies in the chassis (DC power supplies will have green handles). Otherwise, the switch can overheat and shutdown.

      Removing an AC Power Supply

      To remove an AC power supply, follow these steps:

      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 (see ) before removing the original power supply.

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

        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 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.

        Installing an AC Power Supply

          Step 1   Ensure that the system (earth) ground connection has been made for the chassis. For ground connection instructions, see Grounding the Chassis.
          Step 2   If the power supply slot has a filler panel, remove it from the slot by moving its release latch to the left and pulling the panel out of the slot.
          Step 3   Holding the replacement power supply with one hand underneath the module and the other hand holding the handle, align the back end of the power supply (the end with the electrical connections) to the open power supply slot and slide the power supply all the way into the slot until it clicks into place.
          Step 4   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, press it all the way into the slot until it clicks in place.

          Step 5   Attach the power cable to the electrical outlet on the front of the power supply.
          Step 6   Connect the other end of the power cable to an AC power source.

          • For no power redundancy, connect one power supply to one power source.

          • For power supply redundancy, connect two power supplies to one or two power sources.

          • For grid redundancy, connect each of two power supplies to a different power source.

          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 7   Verify that the power supply is operational by checking that the power supply LED is green. For information on what the power supply LEDs indicate, see Power Supply LEDs.

          Replacing a DC Power Supply During Operations

          You can replace an DC power supply during operations so long as there is another power supply installed and operating during the replacement. The switch requires only one power supply for operations, so you can hot swap the redundant power supply during operations. If there is only one power supply installed in the chassis, you can replace it by installing the new power supply in the open power supply slot and making it operational before removing the other power supply.


          Caution

          Be sure that the replacement power supply has the same direction of airflow as the other modules—the fan and AC power supplies must have burgundy colorings and DC power supplies must have green colorings. Otherwise, the switch can overheat and shutdown.


          Warning

          Statement 1034—Backplane Voltage

          Hazardous voltage or energy is present on the backplane when the system is operating. Use caution when servicing

          Removing a 48V DC Power Supply

          If the switch has two power supplies, you can replace one power supply while the other one provides power to the switch. If you have only one power supply in the switch, install the replacement power supply in the open slot before removing the original power supply.

            Step 1   Turn off the circuit breaker for the power source to the power supply that you are replacing.

            Be sure that the LEDs on the power supply turn off.

            Step 2   Remove the power cable connector block from the power supply by doing the following:

            • Push the orange plastic button on the top of the connector block inward toward the power supply.

            • Pull the connector block out of the power supply.

            Step 3   Grasp the power supply handle while pinching the release latch towards the handle.
            Step 4   Pull the power supply out of the bay.

            Installing a 48 V DC Power Supply

            Depending on your power redundancy requirement, be sure there are one or two power sources close to the rack:

            • For no power redundancy, use one power source.

            • For power supply redundancy, use one or two power sources.

            • For grid redundancy, use two power sources.

            If the switch has two power supplies, you can replace one power supply while the other one provides power to the switch. If you have only one power supply in the switch, install the replacement power supply in the open slot before removing the original power supply.

            Before You Begin

            The circuit breaker for the DC power source for the power supply must be turned off.

              Step 1   Grasp the power supply handle and align the back of the new power supply to the empty bay.
              Step 2   Push the power supply into the bay until the release lever locks.
              Step 3   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.

              If the electrical cables have not been connected to the electrical connector block, wire them as described in Wiring a 48 V DC Electrical Connector Block.

              Step 4   Turn on the circuit breaker for the DC power source connected to the power supply and verify that the power supply LED turns on and becomes green.

              For information on what the power supply LEDs indicate, see Power Supply LEDs.

              Wiring a 48 V DC Electrical Connector Block

              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 leakage currentearth connection essential before connecting to system power supply.


              Warning

              Statement 1024—Ground Conductor

              This equipment must be grounded. 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.

                Step 1   Verify that the circuit breaker for the DC power source you are connecting is turned off.
                Step 2   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.
                Step 3   Strip 0.6 inches (15 mm) of insulation off the DC wires that you are using.
                Step 4   Orient the connector as shown in the following figure with the orange plastic button on top.
                Figure 1. Wiring a 930W -48VDC Power Supply Connector Block



                1

                Wire retainer lever

                4

                -48V (-DC) cable

                2

                Orange plastic button on top of the connector

                5

                Grounding cable (8 AWG recommended)

                3

                -48V Return (+DC) cable

                Step 5   Use a small screwdriver to depress the spring-loaded wire retainer lever on the lower spring-cage wire connector. Insert your green (ground) wire into the aperture and then release the lever.
                Step 6   Use a small screwdriver to depress the spring-loaded wire retainer lever on the middle spring-cage wire connector. Insert your black (DC negative) wire into the aperture and then release the lever.
                Step 7   Use a small screwdriver to depress the spring-loaded wire retainer lever on the upper spring-cage wire connector. Insert your red (DC positive) wire into the aperture and then release the lever.
                Step 8   Insert the connector block back into the power supply. Make sure that your red (DC positive) wire aligns with the power supply label, "+ DC".
                What to Do Next

                Verify that the other ends of the cables are attached to the DC power source and ground. You are then ready to turn on the DC power source.