Cisco Nexus 7710 Switch Site Preparation and Hardware Installation Guide
Installing or Replacing Modules, Fan Trays, and Power Supplies
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Installing or Replacing Modules, Fan Trays, and Power Supplies

This chapter includes the following topics:

Using an ESD Wrist Strap to Prevent ESD Damage

Before you touch any switch modules, you must ground yourself to protect the modules from electrostatic discharge (ESD). You can ground yourself by wearing an ESD wrist strap connected to a grounded chassis or a grounded rack.


Caution


Always handle modules by their carrier edges (typically the covered bottom, sides, and front of the module) and never touch the circuitry on the module.


Before You Begin

You must have a grounding connection close to where you are installing components in the chassis.


    Step 1   Attach or wrap an ESD wrist strap to your arm.

    Step 2   Attach the other end of the strap to the grounded chassis in one of the following ways:
    • If the wrist strap has a banana plug on the other end, insert the plug into the ESD port on the chassis (see the following figure for the location of the port on the front of the chassis). The chassis has another ESD port on the rear of the chassis.
      Figure 1. Location of the ESD Port on the Front of the Chassis



      1

      ESD port on the front of the chassis

         
    • If the wrist strap has an alligator clip on the other end, clip that onto one of the two screws holding the grounding lug to the chassis.

    What to Do Next

    After you ground yourself, you can replace the modules on the chassis.

    Installing or Replacing a Supervisor Module

    You can install or replace a supervisor module during switch operations so long as there is another supervisor module installed and operating on the switch. If you eject the active supervisor from its slot in a chassis with two supervisor modules, operations automatically switch over to the standby supervisor module. If you need to replace a supervisor in a chassis with just one supervisor, you can install the new supervisor in the open supervisor slot, make the new supervisor active, and remove the other supervisor module.


    Note


    If you remove a supervisor module without replacing it, you must fill the slot with a blank filler plate to maintain the designed airflow for the chassis.


    Before You Begin
    • You must follow ESD protocols, including the following:
      • You must wear a grounded ESD wristband (or other personal grounding device) whenever you handle the electronic modules outside the grounded chassis.
      • You must carry electronic modules by only their covered edges or handles. Do not touch their electronic components.
      • Whenever a module is outside a grounded chassis, place it flat on an antistatic surface or in an antistatic bag. Never lean the module on anything nor place anything else on top of the module nor lean anything on the module.
    • Verify that the chassis is grounded (see Grounding a Switch Chassis).
    • Verify that you have the following tools and equipment:
      • ESD wrist strap (or other personal grounding device)
      • Number 1 Phillips torque screwdriver Manual torque screwdrivers are recommended. Be sure to never exceed the recommended torque setting for the screw that you are working with.
      • Replacement supervisor module
        • Supervisor 2E (N77-SUP2E=)

      Step 1   If you need to remove a supervisor module to open the slot for a new module, follow these steps (if you already have an open slot, go to the next step):
      Note   

      If the slot that you need to open has a blank filler plate, remove the plate by unscrewing its captive screw and pulling on the handle attached to the plate to remove the plate, and go to Step 3).

      1. Disconnect all of the networking cables attached to the front of the module.
      2. Unscrew the captive screw on the left side of the module until the screw is no longer connected to the chassis (see Callout 1 in the following figure).
        Figure 2. Removing a Half-Width Supervisor Module



        1

        Unscrew the captive screw until it is free of the chassis.

        3

        The handle springs open.

        2

        Press the ejector button.

        4

        Pull the handle to remove the module part way from the slot. Place your other hand under the module and fully remove it from the slot.

      3. Press the eject button on the left side of the module (see Step 2 in the previous figure).

        The ejector springs out part way from the front of the module.

      4. Fully rotate the handle from the front of the module and pull the handle to move the module part way out of its slot.
      5. Place your other hand under the module to support its weight and pull the module fully out of its slot.
      6. Place the module on or in antistatic material.
      Step 2   Install the new or replacement supervisor module as follows:
      1. Unpack the new supervisor module and inspect it for damage.

        If anything is damaged or missing, contact your customer representative immediately.

        Caution   

        Do not touch the electrical components or connectors on the module. Always hold the module by only its covered front and bottom sides.

      2. Press the ejector button next to the handle to release the handle from the front of the module (see Callout 1 in the following figure).
        Figure 3. Positioning a Half-Width Supervisor Module to its Slot



        1

        Rotate the handle fully away from the front of the module.

        3

        Push the module all the way into the slot (until it stops and the front is about 1/4 inch in front of the chassis).

        2

        Align the bottom of the module to the module guides in the slot.

           
      3. Rotate the end of the handle away from the front of the module until it stops (see Callout 1 in the previous figure).
      4. With one hand under the supervisor module and the other hand holding the module by its front, align the rear of the module to the open supervisor slot.
      5. Slide the module onto the guides inside the slot and push the module fully into the slot until you cannot push the module further.

        The front of the module should be about 1/4 inch (0.6 cm) in front of the chassis.

      6. Rotate the handle to the front of the module (see Callout 1 in the following figure) until it clicks when it reaches the front of the module.

        The module should be fully inserted in the slot and the front of the module should be even with the fronts of all of the other installed modules. The captive screw by the ejector button on the module should be aligned to a screw hole on the chassis.

        Figure 4. Securing a Supervisor Module to its Slot



        1

        Rotate the handle all the way to the front of the module.

        2

        Tighten the captive screw to 8 in-lb (0.9 N·m) of torque.

      7. Screw in the captive screw to secure the module to the chassis (see Callout 2 in the previous figure). Tighten the screw to 8 in-lb (0.9 N·m) of torque.
      8. Verify that the supervisor module LEDs turn on and appear as follows:
        • STATUS LED is green.
        • SYSTEM LED is green.
        • ACTIVE LED is amber or green.

        For more information about the LED states for this module, see Supervisor Module LEDs.

      9. Attach the management cable to the MGMT ETH port.

        The MGMT ETH LED should be green. If not, see Supervisor Module LEDs for information about the LED states.


      Installing or Replacing an I/O Module

      You can install or replace an I/O module during operations so long as there is at least another I/O module installed and operating on the switch. If you remove an I/O module without replacing it, you must fill the slot with a blank filler plate to maintain the designed airflow for the chassis.

      Before You Begin
      • You must follow ESD protocols, including the following:
        • You must wear a grounded ESD wristband (or other personal grounding device) whenever you handle the electronic modules outside the grounded chassis.
        • You must carry electronic modules by only their covered edges or handles. Do not touch their electronic components.
        • Whenever a module is outside a grounded chassis, place it flat on an antistatic surface or in an antistatic bag. Never lean the module on anything nor place anything else on top of the module nor lean anything on the module.
      • Verify that the chassis is grounded (see Grounding a Switch Chassis).
      • Verify that you have the following tools and equipment:
        • Number 1 Phillips torque screwdriver

          Note


          Manual torque screwdrivers are recommended. Be sure to never exceed the recommended torque setting for the screw that you are working with.


        • Replacement or new I/O module

        Step 1   Open a slot in the chassis for the new I/O module as follows:
        Note   

        If you need to remove a blank filler plate from the slot, unscrew the captive screws on either side of the module and pull the handle on the plate to remove it from the slot. Continue with Step 2.

        1. Disconnect all of the networking cables attached to the front of the I/O module to be removed.
        2. Unscrew the captive screw on each side of the module until the screws are loose and no longer connected to the chassis (see Callout 1 in the following figure).
          Figure 5. Removing an I/O Module



          1

          Loosen the two captive screws

          3

          Two handles spring out part way from the front of the module

          2

          Press the two ejector buttons

             
        3. Press the two ejector buttons on the each side of the module (see Callout 2 in the above figure).

          The two handles spring out part way from the front of the module.

        4. Fully rotate the two handles away from the front of the module and pull on them to move the module part way out of its slot.
        5. Place one hand under the module to support its weight, grasp the front of the module with the other hand, pull the module fully out of its slot, and set the module on an antistatic surface.
          Caution   

          Do not touch any electrical circuitry on the removed I/O module. Handle the module only by its covered surfaces (front and bottom of the module) and always set the module on an antistatic surface when it is not inside the chassis.

        Step 2   Install the new I/O module in the open slot as follows:
        1. Unpack the new I/O module, set it right side up on an antistatic surface (so that you can see the electrical components from above the module), and inspect the module for damage.

          If anything is damaged, contact your customer representative immediately.

        2. Press the two eject buttons (one on each side of the module front) and rotate the handles away from the front of the module.
        3. Without touching any electronic circuitry, grasp the front of the I/O module with one hand, place your other hand under the module to support its weight, and lift the module to the slot.
        4. Align the back of the module to the guides inside the slot, and slide the module fully into the slot by pushing on the front of the module.

          If you push the module fully into the slot, you seat it onto its connectors inside the slot and the handles move part way toward the front of the module. The front of the module should be 1/4 inch (0.6 cm) out of the slot.

        5. Simultaneously rotate each of the two handles to the front of the module until they click.

          As you rotate the handles to the front of the module, the module should move fully into the slot.

        6. Verify that the front of the module is even with the fronts of the other installed I/O modules. If not, press both ejector buttons, pull on the handles to partly remove the module, and repeat Steps 2d and 2e to reseat the module in the slot.
        7. Screw in the two captive screws (one on each side of the module) to secure the module to the chassis. Tighten the screws to 8 in-lb (0.9 N·m) of torque.

          The Status module LED should be green. If not, see I/​O Module LEDs for information about the LED states.

        8. Attach networking cables to the I/O ports.

          The LED for each port should be green. If not, see I/​O Module LEDs for information about the LED states.


        Replacing a Fan Tray

        You can replace a fan tray module during operations so long as there are at least two other fan tray modules operating in the chassis. You can also remove a fan tray in order to replace one of the two fabric modules installed behind it. When not replacing a fan tray or a fabric module, there should be three fan trays operating in the chassis.


        Note


        The switch can operate for three minutes without the fan tray that you are replacing, but if the switch air-inlet temperature is less than 86° Fahrenheit (30° C), you have up to 72 hours to replace the fan tray. Because temperatures can change over time, we recommend that you replace the fan tray within three minutes.


        If you need to remove the fan tray to replace a fabric module, see Installing or Replacing a Fabric Module.


        Note


        The fan tray displays the fabric module LEDs so that you can see the status of the two fabric modules installed behind that fan tray.


        Before You Begin
        • You must follow ESD protocols, including the following:
          • You must wear a grounded ESD wristband (or other personal grounding device) whenever you handle the electronic modules outside the grounded chassis.
          • You must carry electronic modules by only their covered edges or handles. Do not touch their electronic components.
          • Whenever a module is outside a grounded chassis, place it flat on an antistatic surface or in an antistatic bag. Never lean the module on anything nor place anything else on top of the module nor lean anything on the module.
        • Verify that the chassis is grounded (see Grounding a Switch Chassis).
        • Verify that you have the following tools and equipment:
          • ESD wrist strap (or other personal grounding device)
          • Number 1 Phillips torque screwdriver Manual torque screwdrivers are recommended. Be sure to never exceed the recommended torque setting for the screw that you are working with.
          • Replacement fan tray
            • N77-C7710-FAN=

          Step 1   Remove the fan tray as follows:
          1. Use a Phillips torque screwdriver to loosen the four captive screws on the fan tray until they are no longer connected to the chassis.
          2. Grab both fan tray handles with both of your hands.
          3. Pull the fan tray straight out of the slot.
            Figure 6. Removing a Fan Tray

            1

            Unscrew four captive screws.

            2

            Pull on both handles to remove fan tray from the chassis.

          4. Set the fan tray on an antistatic surface or inside an antistatic bag.
            Caution   

            Do not touch the electrical connectors on the back side and do not set the back side connectors on anything—always set a fan tray down on a covered side to protect its connectors.

          Step 2   Install the new fan tray in the open slot as follows:
          1. Unpack the new fan tray and inspect it for damage.

            If anything is damaged or missing, contact your customer representative immediately.

          2. Carefully press the whole fan tray into the slot so that the four alignment pins go into their holes in the chassis and the electrical connectors at the bottom of the chassis are inserted into the chassis connectors inside the slot. Make sure that the front of the fan tray is touching the outer surface of the chassis and that the four captive screws on the fan tray are aligned to four screw holes in the chassis.
            Figure 7. Installing a Fan Tray



            1

            Align the four pins in the fan tray with four holes in the chassis.

            2

            Press the whole fan tray into the chassis slot.

          3. Screw in each of the four captive screws to secure the fan tray to the chassis and tighten them to 8 in-lb (0.9 N·m) of torque.
          Step 3   Verify that the fan tray is functioning by making sure that its Status LED is green.

          For more information about the fan tray LEDs, see the I/​O Module LEDs topic.


          Installing or Replacing a Fabric Module

          The fabric modules are located as follows behind the fan trays on the back side of the chassis:

          • Fabric slots 1 and 2 are behind fan tray slot 1
          • Fabric slots 3 and 4 are behind fan tray slot 2
          • Fabric slots 5 and 6 are behind fan tray slot 3

          When the fan trays are installed, they display the LED states for the fabric modules installed behind them.

          You can install a fabric module during operations so long as there is at least one other fabric module installed and functioning in the chassis. To install or replace a fabric module, you must first remove the fan tray that is in front of the fabric module. If the chassis has fewer than six fabric modules, leave the empty slots unfilled—the fan tray that you place outside the fabric modules maintains the designed airflow for the chassis.

          Before You Begin
          • The chassis must be grounded (see Grounding a Switch Chassis).
          • You must be wearing wearing an ESD wrist strap (or other ESD prevention device) that is connected to the ESD port on the grounded chassis.

            Step 1   Remove the fan tray that covers the fabric module that you are replacing by following these steps:
            1. Loosen four captive screws on the fan tray until they are loose and are no longer connected to the chassis.
            2. Grab both handles with both of your hands and pull the bottom of the fan tray out so that its connectors disconnect from the chassis (see the following figure).
              Figure 8. Removing a Fan Tray

              1

              Unscrew four captive screws until they are no longer attached to the chassis.

              2

              Pull both handles to remove the module from the chassis.

            3. After the connectors are free of the chassis connections, pull whole fan tray off the chassis.
            4. Set the fan tray down on one of its covered sides only on an antistatic pad or inside an antistatic bag.
              Caution   

              Do not touch the electrical connectors on the back side and do not set the back side connectors on anything—always set a fan tray down on a covered side to protect the connectors.

            Step 2   If you need to open a fabric slot for the new fabric module, remove a fabric module as follows:
            1. With your face at least 12 inches (30 cm) away from the front of the fabric module, press both ejector buttons on the front of the module (see Callout 1 in the following figure).
              Caution   

              Keep your face away from the front of the fabric module so that the levers do not hit your face when they spring out from the front of the module.

              Figure 9. Unlocking a Fabric Module from its Slot



              1

              Press both eject buttons.

              3

              Pull the handles to partially remove the module from the slot.

              2

              Handles spring out from the module.

                 
            2. Grasp each of the two levers with your two hands and fully rotate the levers out 90 degrees from the fabric module.
            3. Pull both levers until the fabric module is about 3 inches (7 cm) out of the chassis (see Callout 3 in the previous figure).
            4. Rotate both levers back to the front of the module (see Callout 1 in the following figure).

              Each lever clicks when it locks in place at the front of the module.

              Figure 10. Removing the Fabric Module from its Slot



              1

              Rotate both levers to the front of the module until they click.

              2

              Pull the module out of the slot.

            5. Grasp the front of the module with one hand, place the other hand under the module to support its weight, and pull the module out of the slot (see Callout 2 in the previous figure).
              Caution   

              Be careful not to touch any electrical contacts on the back of the module. Handle only covered sides or edges of the module.

            6. Place the module on an antistatic surface or inside an antistatic bag.
            Step 3   Install the new fabric module in the chassis as follows:
            1. Unpack the new fabric module and inspect it for damage.

              If anything is damaged or missing, contact your customer representative immediately.

            2. Hold the front of the module with one hand and place the other hand under the module.
            3. Rotate the module clockwise and align the back of the module to the module guides at the top and bottom of the open fabric slot in the chassis.
            4. Push the module half way into the slot (see the following figure).
              Figure 11. Inserting the Fabric Module into the Chassis



              1

              Align the module with the guides in the open slot and push the module half way into the slot.

              3

              Handles spring out from the module.

              2

              Press both eject buttons.

                 
            5. With your face away from the fabric module, press both ejector buttons on the front of the module.
              Caution   

              Keep your face at least 12 inches (30 cm) from the front of the fabric module so that the ejector handles do not hit your face when they spring out from the front of the module.

              Both ejector handles spring out from the front of the module (see Callout 2 in the previous figure).

            6. Grasp both handles, fully rotate the levers 90 degrees from the front of the module, and push the module all the way into the slot until it seats.

              The front of the module will be about 1/4 inch out from the installed fabric modules.

            7. Simultaneously rotate both handles to the front of the module while pressing the module further into the slot (see Callout 1 in the following figure).

              The handles click when fully rotated to the front of the module.

              Figure 12. Securing the Fabric Module to the Slot



              1

              Rotate the handles to the front of the module until they click.

                 
            8. Verify that the module is secured to the chassis and that you cannot remove it without pressing the eject buttons.
            Step 4   Reinstall the fan tray over the installed fabric module as follows:
            1. Carefully press the whole fan tray into the slot so that the four alignment pins go into their holes in the chassis and the electrical connectors at the bottom of the chassis are inserted into the chassis connectors inside the slot. Make sure that the front of the fan tray is touching the outer surface of the chassis and that the four captive screws on the fan tray are aligned to four screw holes in the chassis.
              Figure 13. Installing a Fan Tray



              1

              Align the four pins in the fan tray with four holes in the chassis.

              2

              Press the whole fan tray into the chassis slot.

            2. With the electrical contacts on the fan tray aligned to contacts on the back plane, press the fan tray fully into the slot.

              The front of the fan tray should be even with the fronts of the other fan trays and the four captive screws on the fan tray should be aligned to four screw holes in the chassis.

            3. Screw in each of the four captive screws on the front of the fan tray to secure the fan tray to the chassis. Tighten each screw to 8 in-lb (0.9 N·m) of torque.
            4. Verify that the Status LED is green. For more information about the LED states, see I/​O Module LEDs.

            Installing or Replacing a Power Supply in a Switch Chassis

            You can install up to eight power supplies of the following types:

            • 3-kW AC power supply (N77-AC-3KW)
            • 3-kW DC power supply (N77-DC-3KW)

            If you leave any power supply slots empty, you must install a blank filler plate (N77-3KPS-BLANK-H=) in that slot to maintain the designed airflow.


            Note


            The chassis ships with power supplies already installed but you can optionally remove the power supplies to make the chassis lighter for the installation.


            You follow the same steps to install AC and DC power supplies into the switch, but you ground them differently. For an AC power supply, you automatically ground it when you connect its power cable to the power supply and the power source. For a 3-kW DC power supply, you do not directly connect the power supply to the earth ground.

            Before You Begin
            • The switch chassis must be installed in a cabinet or rack that is secured to the data center.

            You need the following additional tools and equipment:

            • Nut driver attachment for Number 1 Phillips-head screwdriver or ratchet wrench with torque capability (used only for DC power supplies)
            • Crimping tool
            • For 3-kW DC power supplies, you need four power cables sized to reach the DC power source or power interface unit (PIU)
            • Grounding wire—Size this wire to meet local and national installation requirements. For U.S. installations, you must use a 6 AWG copper conductor. For installations outside the U.S., consult your local and national electrical codes. The length of the grounding wire depends on the proximity of the switch to proper grounding facilities.

              Step 1   If you need to open a power supply slot for another power supply, follow these steps:
              Note   

              If you neet to remove a blank filler plate, unscrew its captive screws and pull it off the chassis. Go to Step 2.

              1. Turn off the power for the power supply that you are removing, as follows:
                1. Ensure that the power switch on the front of the power supply is set to standby (labelled as 0). The Output LED turns off.
                2. Verify that the Output LED turns off. If the LED is still on, return to Step 1.
                3. If you are removing a DC power supply, ensure that the power is turned off at the power source by turning off the power for that circuit, and verify that the Input LEDs turn off.
              2. If you are removing a power supply, detach the power and ground cables as follows:
                • For a 3-kW AC power supply, unplug the power cables that are attached to the power supply and the power source.
                • For a 3-kW DC power supply, open the terminal box, and use a Phillips screwdriver to remove the power cables from their terminals. Replace the terminal box cover. Remove the power cables from the power source.
              3. Remove the power supply or blank filler plate from the power supply slot as follows:
                Note   

                To remove a blank filler plate, unscrew its captive screws and pull on its handle to remove the plate from the slot. Go to Step

                • For a 3-kW power supply, press its ejector latch to the left, pull the power supply part way out of the slot by its handle, place your other hand under the module to support its weight, and pull it fully from the slot.
              Step 2   Install the new power supply in the open slot as follows:
              1. Verify that the power switch on the front of the new power supply is set to standby (labelled as 0) and that the power supply is not connected to any power sources.
              2. Hold the handle on the power supply with one hand, place your other hand under the power supply to support its weight, and position the power supply with its back end at the open power supply bay.
              3. Slide the unit all the way into the power supply bay until one of the following situations occurs:
                • For a 3-kW power supply, the release latch on the front of the power supply clicks and prevents you from moving the power supply in or out of the chassis. This action completes the mounting of the power supply on this chassis.

              What to Do Next

              • For an AC power supply, you must connect it to an AC power source (see the “Connecting an AC Power Supply to AC Power Sources” topic). The power supply will be automatically grounded through its power cable.
              • For a 3-kW DC power supply, you must connect the power supply to the DC power source (see the “Connecting a DC Power Supply to DC Power Sources” topic).

              Connecting a 3-kW AC Power Supply to AC Power Sources

              You use one power cord to connect a 3-kW power supply to its AC power source and to ground the power supply. Depending on the power mode that you use for the switch, you either connect all of the power supplies to one AC power source or you connect half of the power supplies to one AC power source and the other half to another AC power source:

              • For combined power mode (no power redundancy), you need enough power supplies to power all switch operations and connect all of the power supplies to the same AC power source. You can install the power supplies in any open power supply slot in the chassis.
              • For power supply redundancy mode (n+1 redundancy mode), you need enough power supplies to power all switch operations and one extra power supply that can replace a failing power supply. You connect all power supplies to the same AC power source. You can install the power supplies in any open power supply slot in the chassis.
              • For input source redundancy (grid redundancy) mode or full redundancy mode, you need twice the number of power supplies needed to power the switch operations. You connect half of the power supplies to one power source for active power and the other half to another power source for redundant power. You must ensure that the power supplies on the left side of the chassis (slots 1, 2, 5, and 6) are connected to one grid and that the power supplies on the right side of the chassis(slots 3, 4, 7, and 8) are connected to the other grid.
              Before You Begin

              Before you connect power supplies to one or two power sources, ensure all of the following:

              • You have receptacles for one or two AC power sources within reach of the power supply cables. The number of power sources depends on the power mode to be used for the switch.
                • Combined power (no power redundancy)—One AC power source
                • Power supply redundancy (n+1 redundancy)—One AC power source
                • Input source redundancy (power-grid redundancy)—Two AC power sources
                • Full redundancy—Two AC power sources
              • The AC power sources are rated as follows:
                • For North American installations—20A with 110V or 220V circuits.
                • For international installations—size the circuits by local and national standards.
              • The power supply is already installed in the chassis.
              • The chassis is connected to an earth ground.

                Step 1   Ensure that the power supply switch located on the front of the power supply is set at standby (labeled as 0).
                Step 2   Plug one AC power cable into the power supply, and pull down the retention clip over the plug on the power cable.
                Step 3   Plug the other end of the power cable into a AC power source supplied by the data center.
                Note   

                If you are using the combined power mode or power supply redundancy, you connect the power cables to the same 20-A circuit. If you are using the input source redundancy mode or full redundancy mode, you connect half of the power cables to one AC power source and the other half to another AC power source.

                Warning   

                Take care when connecting units to the supply circuit so that wiring is not overloaded.

                Statement 1018

                Warning   

                This product relies on the buildings installation for short-circuit (overcurrent) protection. Ensure that the protective device is rated not greater than:

                cs-1005-1

                250V, 20 A

                Statement 1005

                Step 4   Turn the power supply switch from standby to on (from 0 to 1 as labeled on the power switch).
                Step 5   Verify that the power supply is receiving AC power and outputting DC power by making sure that the INPUT and OUTPUT power supply LEDs are lit and the FAULT LED is not lit or flashing. For an explanation of all the power supply LEDs and the conditions that they indicate, see Table D-5.
                Note   

                When you first activate the power supply, you can verify the functionality of the LEDs by checking that each LED turns on for a couple of seconds.

                If the Fault LED is flashing red, turn the power switch to standby (labeled as 0), check the AC power connections on the power supply and the AC power source, and then turn the power switch back on (labeled as 1). The Input and Output LEDs for the connected power supplies should be green and the Fault LED should be off.


                Connecting DC Power Supplies with Power Sources

                Connect each installed DC power supply with a DC power circuit as follows:


                Note


                If you are using combined power mode (no power redundancy) or power supply (n+1) power mode, connect all of the power supplies to the same power circuit (grid). If you are using input source (n+n) or full power mode, connect half of the power supplies (located in slots 1, 2, 5, and 6) to one AC power circuit and the other half of the power supplies (located in slots 3, 4, 7, and 8) to another AC power circuit.


                Before You Begin
                • The power supplies are installed in the chassis.
                • A DC power source is within reach of power cables that will be attached to the power supplies.
                • Power cables are available to connect each DC power supply to the DC power source.

                  Step 1   Turn the power switch to standby (labeled 0 on the power switch).
                  Step 2   Turn off the power at the circuit breakers for the portions of the DC grid power that you are connecting to and verify that all of the LEDs on the power supplies are off.
                  Warning   

                  Before performing any of the following procedures, ensure that power is removed from the DC circuit.

                  Statement 1003

                  Step 3   Size the power cables to the distance between the power supply and the DC power grid. If you need to cut the cable, cut it at the end that connects to the DC power grid, remove 0.75 inch (19 mm) of insulation from the cut ends, and attach them to the DC power system. Be sure to connect the negative cables to negative lines and positive cables to positive lines.
                  Note   

                  For all your power connections, if you are using cables with two different colors, use one color cable for all positive circuits and the other color for all negative circuits.

                  Note   

                  Hazardous voltage or energy may be present on DC power terminals. Always replace the cover when the terminals are not in service. Be sure uninsulated conductors are not accessible when cover is in place. Statement 1075

                  Step 4   Remove the three screws that hold down the safety cover for the terminal box on the front of the DC power supply and remove the cover (see the following figure).
                  Note   

                  The terminal box has four slots for four power terminals (ordered as negative [-], positive [+], positive [+], and negative [-]). Each terminal has two nuts that you use to fasten a power cable to the terminal.

                  Figure 14. Removing the Safety Cover for the Terminal Box on a 3-kW DC Power Supply

                  1

                  Remove three screws from the safety cover.

                  2

                  Remove the cover.

                  Step 5   Install four cables (two positive and two negative cables) in the four terminal slots as follows:
                  1. Unscrew the two nuts in each of the four terminal slots.
                  2. Attach and crimp each lug to the end of each power cable.
                  3. Attach each cable lug to the two terminal posts in each slot, fasten with two nuts, and tighten to 40 in-lb (4.5 N·m).
                    Note   

                    For all your power connections, if you are using cables with two different colors, use one color cable for all positive circuits and the other color for all negative circuits.

                  4. Replace the safety cover on the terminal box and fasten with three screws.
                  Step 6   Install the four cables from the DC power supply to a DC power source as follows:
                  1. If the unconnected end of each power cable is not stripped of its insulation for the last 0.75 inches (19 mm), use wire strippers to remove that amount of insulation.
                  2. Attach the negative cables to the negative terminals of a DC power source, and attach the positive cables to the positive terminals of the same power source.
                    Note   

                    If you are using combined power mode or power supply redundancy mode, connect all the power supplies in the chassis to the same power source. If you are using input source redundancy mode or full redundancy mode, connect half the power supplies to one DC power source and the other half of the power supplies to another DC power source.

                  Step 7   For the powered down circuits connected to the power supplies, turn on the power at the circuit breaker. The Input 1 (IN1) and Input 2 (IN2) LEDs turn on each connected power supply.
                  Step 8   Turn on the power supply by setting the power switch to 1. The LEDs should flash and then the Output LED should turn on in addition to the Input LEDs.

                  If the FAULT LED is lit or flashing, call Cisco TAC for assistance.


                  What to Do Next

                  You are ready to connect the switch to the network.