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Connect Power to a QFX5120-48T Switch Powered by a High-Voltage Power Supply

 

We ship the QFX5120 switches with two AC or DC power supplies preinstalled. You must order a high-voltage power supply separately. Each power supply is a hot-removable and hot-insertable field-replaceable unit (FRU) when the second power supply is installed and running: You can install power supplies in the slots next to the fan modules without powering off the switch or disrupting switch functions.

Before you begin connecting power to a QFX5120-48T switch powered by a high-voltage power supply:

  • Ensure that you have a power cord appropriate for your geographical location and power input available. You must order the power cord separately.

  • Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

  • Ensure that you have connected the switch chassis to earth ground.

    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 (see Connect the QFX5120 Switch to Earth Ground). For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the switch chassis to connect to earth ground. The switch gains 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.

To connect power to a QFX5120-48T switch powered by a high-voltage power supply:

  1. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end of the strap to a site ESD point.
  2. Ensure that the power supplies are fully inserted in the chassis and the latches are secure. If only one power supply is installed, ensure that a cover is installed over the second power supply slot.
  3. Locate the power cord appropriate for your geographical location and power input.Warning

    Ensure that the power cord does not block access to device components or drape where people can trip on it.

  4. Insert the coupler end of the power cord into the power cord inlet on the power supply faceplate (see Figure 1).
    Figure 1: Connect Power to a QFX5120-48T Switch Powered by a High-Voltage Power Supply
    Connect
Power to a QFX5120-48T Switch Powered by a High-Voltage Power Supply
    Note

    The switch powers on as soon as power is provided to the power supply. There is no power switch on the QFX5120.

  5. Connect power to the switch:

    • AC power input:

      1. If the AC power source outlet has a power switch, set it to the off position.
      2. Insert the power cord plug into an AC power source outlet.
      3. If the AC power source outlet has a power switch, set it to the on position.

      DC power input:

      1. Switch the circuit breaker on the panel board that services the DC circuit to the off position.
      2. Connect the power cables to the terminals on the power source.
      3. Close the input circuit breaker.
  6. Verify that the AC and DC LEDs on the power supply are lit green. If the fault LED (!) is lit, disconnect the power supply from the power source, and replace the power supply (see Remove a Power Supply from a QFX5120 Switch).