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Connect the QFX5700 to Power

To connect power to a QFX5700 switch, read the following procedures.

Note:

Do not mix power supply models in the same chassis in a running environment.

Connect the QFX5700 switch to Earth Ground

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the chassis to earth ground before you connect it to power.

You must install the QFX5700 in a restricted-access location and ensure that the chassis is always properly grounded. The QFX5700 has a two-hole protective grounding terminal provided on the chassis. Under all circumstances, use this grounding connection to ground the chassis. For AC-powered systems, you must also use the grounding wire in the AC power cord along with the two-hole grounding lug connection. This tested system meets or exceeds all applicable EMC regulatory requirements with the two-hole protective grounding terminal.

If an external ground connection is required, ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable you supply. Using a grounding cable with an incorrectly attached lug can damage the switch.

Note:

Mount your switch in the rack before attaching the grounding lug to the switch.

Ensure that you have the following parts and tools available:

  • An electrostatic discharge (ESD) grounding strap (provided).

  • Protective earthing terminal lug (provided).

  • Grounding cable for your QFX5700 (not provided)—The grounding cable must be 4 AWG (21.1 mm²) stranded wire should be rated 90° C or per local electrical code.

  • Grounding lug for your grounding cable (provided)—This bracket attaches to the lower left corner of the switch chassis next to the bottom power supply, providing a protective earthing terminal for the switch. The grounding lug required is a Panduit LCD6-14A-L or equivalent.

  • A number 3 Pozidriv or Phillips screwdriver (not provided) to tighten the two screws that are mounted on the chassis.

The provided terminal lugs are Panduit LCD4-14A-L, or equivalent, and sized for 4 AWG (21.1 mm2) power source cables. The 4 AWG (21.1 mm²) stranded wire should be rated 90° C or per local electrical code. We recommend that you install heat-shrink tubing insulation around the crimped section of the power cables and lugs.

An AC-powered QFX5700 gets additional grounding when you plug the power supply in the switch into a grounded AC power outlet by using an AC power cord appropriate for your geographical location.

To connect earth ground to a QFX5700:

  1. Verify that a licensed electrician has attached the cable lug (provided in the accessory kit) to the grounding cable.
  2. Connect the other end of the grounding cable to a proper earth ground, such as the rack in which the switch is mounted.
  3. Wrap and fasten one end of the ESD grounding strap around your bare wrist and connect the other end of the strap to one of the ESD points on the chassis. See Figure 1.
    Figure 1: ESD Point for the QFX5700ESD Point for the QFX5700
      1
    ESD point
     
  4. Remove the two M6 screws with attached washers on the chassis using either a Pozidriv or Phillips screwdriver.
  5. Place the chassis grounding lug and cable over the screw holes with the cable connection pointing to the left. See Figure 2.
    Figure 2: Connect a Grounding Cable to the QFX5700 Connect a Grounding Cable to the QFX5700
  6. Place the two screws with attached washers over the grounding lug and grounding cable.
  7. Tighten the two M-6 screws using a Pozidriv or Phillips screwdriver.
  8. Dress the grounding cable and ensure that it doesn’t touch or block access to other device components and that it doesn’t drape where people can trip over it.

Connect AC Power to a QFX5700

Before you begin to connect power to the switch, be sure you understand how to prevent ESD damage. See Prevention of Electrostatic Discharge Damage.

Note:

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the QFX5700 switch to earth ground before you connect it to power.

CAUTION:

Before you connect power to the switch, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the switch (for example, by causing a short circuit). To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the chassis to earth ground before you connect it to power. For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the switch chassis to connect to the earth ground. The switch gains additional grounding when you plug the PSM in the switch to a grounded AC power outlet by using the AC power cord appropriate for your geographical location.

The AC power supply unit (PSUs) in an QFX5700 switch is a hot-removable and hot-insertable field-replaceable unit (FRU). You can remove and replace it without powering off the switch or disrupting routing functions.

To connect AC power to a QFX5700 chassis:

  1. Connect the chassis to earth ground (see Connect the QFX5700 switch to Earth Ground).
    CAUTION:

    To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, a QFX5700 must be adequately grounded before it is connected to power. For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the rear panel of the QFX5700 to connect to the earth ground. A QFX5700 switch gets additional grounding when you plug the power supply in the switch into a grounded AC power outlet by using the AC power cord appropriate for your geographical location.

  2. Ensure that you have a power cord appropriate for your geographical location available to connect AC power to the switch.
  3. Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage.
  4. Install power supplies in the switch and apply power.
  5. Ensure that you have an ESD grounding strap.
  6. If not already installed, install the power supplies in the switch.
    Note:

    Each power supply must be connected to a dedicated power source outlet.

To connect AC power to a QFX5700 switch:

  1. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the device.

  2. Ensure that the power supplies are fully inserted in the chassis and the latches are secure.

  3. Locate the AC power cords shipped with the QFX5700 switch; the cords have plugs appropriate for your geographical location.

  4. Insert the coupler end of the power cord into the AC power cord inlet on the AC power supply faceplate.

    Figure 3: Connecting an AC Power Cord to the QFX5700 Connecting an AC Power Cord to the QFX5700
    Figure 4: Connecting an AC Power Cord to the QFX5700 Connecting an AC Power Cord to the QFX5700
  5. If the AC power source outlet has a power switch, set it to the off (O) position.

    Note:

    The QFX5700 powers on as soon as power is provided to the power supply unit. There is no power switch on the power supply unit.

    Insert the power cord plug into an AC power source outlet.

  6. If the AC power source outlet has a power switch, set it to the on (|) position.

  7. Verify that the status LEDs on each power supply are lit green. Verify that the status LEDs on each power supply are lit green

Connect DC Power to a QFX5700

The DC power supply units (PSUs) in an QFX5700 switch is a hot-removable and hot-insertable field-replaceable unit (FRU). You can remove and replace it without powering off the switch or disrupting routing functions.

Warning:

DC-powered QFX5700 switches are intended for installation only in a restricted-access location.

Note:

The battery returns of the DC power supply must be connected as an isolated DC return (DC-I).

To connect DC power to a QFX5700 chassis:

  1. Connect the chassis to earth ground.
    CAUTION:

    To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, a QFX5700 switch must be adequately grounded before it is connected to power.

    CAUTION:

    Before you connect power to the switch, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the switch (for example, by causing a short circuit). To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the chassis to earth ground before you connect it to power. For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the switch chassis to connect to the earth ground.

  2. Read the following:
    • DC Power Electrical Safety Guidelines

    • DC Power Copper Conductors Warning

    • DC Power Disconnection Warning

    • DC Power Grounding Requirements and Warning

    • Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage

    • Ensure that you have an ESD grounding strap.

    • If not already installed, install the DC power supplies in the switch.

    • Ensure that you have the following parts and tools available:

      • Phillips (+) screwdriver, 1/4-in., with a torque range between 6 lb-in. (0.68 Nm) and 7 lb-in. (0.79 Nm) (not provided)

      • Power cable or cables appropriate for your geographical location to connect DC power to the QFX5700. We recommend you use a 4 AWG gauge DC power cable such as a Panduit/LCDX4-14AH-L. The cable lugs are provided with the power supplies.

      Note:

      Each power supply unit must be connected to a dedicated power source outlet.

    To connect DC power to a QFX5700 switch:

    1. Attach an ESD grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point.
    2. Ensure that the power supplies are fully inserted in the chassis and the latches are secure.
    3. Ensure that the DC input current selector (DIP switch) is set to 80 A.
    4. Open the cable manager latch on the terminal block cover of a power supply unit.
    5. Use a Phillips screwdriver to loosen the screw holding the cable manager latch to the power supply terminal block cover.
      Figure 5: Removing the cable manager latchRemoving the cable manager latch
    6. Remove the cable manager bracket to expose the four terminal studs.
    7. If you are using straight DC power cables, place the ends of the power cable connectors over the four terminal studs.
    8. Secure the power cables to the four terminal studs with hex nuts.
    9. Use a wrench to tighten the hex-nuts by applying torque to between 6 lb-in. (0.68 Nm) and 7 lb-in. (0.79 Nm).
      CAUTION:

      You must use an appropriate torque-controlled tool to tighten the hex-nuts on the DC power cable connector. Do not over tighten the screws. Applying excessive torque damages the terminal block and the wiring tray.

    10. Connect the power supply unit to a 80 A power source.
    11. Repeat Step 3 through Step 10 to connect the other DC power supplies.
    12. Verify that the status LEDs on each power supply are lit green and on steadily. If the status LED is lit amber, remove power from the power supply, and replace the power supply. Do not remove the power supply until you have a replacement power supply ready. The power supplies must be installed in the QFX5700 switch to ensure proper airflow.
      CAUTION:

      Replace a failed power supply with a new power supply within 30 seconds of removal to prevent chassis overheating.

    13. Reattach the cable manager latch that you removed in Step"6" and tighten the thumb screw.
      Figure 6: Reattaching the cable manager latchReattaching the cable manager latch
    14. Close the cable manager latch to hold the power cables in place.
      Note:

      Ensure that the power cables do not block access to device components or drape where people could trip over them.

      Figure 7: Reattaching the cable manager latchReattaching the cable manager latch
  3. Connect DC power to the power supply and install in the chassis.