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Connect the QFX5240 Switch to Power

Ground the QFX5240 Switch

To ensure proper operation and to meet safety and electromagnetic interference (EMI) requirements, you must connect QFX5240 switches to earth ground before you connect it to power.

You must install QFX5240 switches in a restricted-access location and ensure that the chassis is always properly grounded. QFX5240 switches come with a two-hole protective grounding terminal provided on the chassis. See Figure 1. 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.

CAUTION:

Ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable that you supply. Using a grounding cable with an incorrectly attached lug can damage the device.
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:

  • A grounding cable must be 2 AWG , minimum 90° C wire, or as permitted by the local code.

  • Panduit LCDXN2-14AF-E or equivalent grounding lug

  • Two M6 screws with start washers

  • Number 2 Phillips (+) screwdriver—not provided

  • ESD grounding strap—not provided

  • Grounding lug:

    • QFX5240: The grounding lug required is a Panduit LCDXN2-14AF-E or equivalent. The grounding lug attaches to the device chassis through the left-front mounting bracket, providing a protective earthing terminal for the device.

The QFX5240 switches chassis gain 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 ground the QFX5240:

  1. Connect one end of the grounding cable to an appropriate earth ground site, such as the mounting rack.
  2. Remove the two M6 screws and star washers from the earthing terminal on the side of the chassis.
  3. Place the Panduit LCDXN2-14AF-E or equivalent grounding lug attached to the grounding cable over the protective earthing terminal.
  4. Secure the grounding lug to the protective earthing terminal with the M6 screws and star washers.
    Figure 1: Connect a Grounding Cable to a QFX5240 Switch

    Connect a Grounding Cable to a QFX5240 Switch
  5. Dress the grounding cable and ensure that it does not touch or block access to other device components. Also make sure the cable does not drape where people could trip over it.

How to Connect AC Power to a QFX5240 Switch

Ensure that you have a power cord appropriate for your geographical location available to connect AC power to the switch.

Before you begin connecting AC power to the switch:

  • Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) 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. 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. For instructions on connecting earth ground, see Ground the QFX5240 Switch. 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.

  • Install the power supplies in the chassis. For instructions on installing a power supply in a QFX5240, see Install an AC Power Supply Unit in QFX5240 Switches.

The QFX5240 ships from the factory with two power supplies. Each power supply is a hot-removable and hot-insertable field-replaceable unit (FRU). You can install a replacement power supply in the slots next to the fan modules without powering off the switch or disrupting the switching function.

Note:

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

To connect AC power to the QFX5240:

  1. Attach the grounding strap to your bare wrist and to a site ESD point.
  2. Ensure that the power supplies are fully inserted in the chassis and the latches are secure.
  3. Locate the power cords shipped with the switch; the cords have plugs appropriate for your geographical location. See AC Power Cord Specifications .

    For each power supply:

    1. Connect the AC power cord. Insert the power cord coupler firmly into the AC inlet on the power supply faceplate. See Figure 2.
      Figure 2: Connect the AC Power Cord Connect the AC Power Cord
    2. Connect a dedicated customer site 2-pole circuit breaker for each power supply. We recommend that you use a dedicated customer-site circuit breaker rated for 20A (250V), or as required by local code.
  4. If the AC power source outlet has a power switch, set it to the off (O) position.
    Note:

    The switch powers on as soon as you provide power to the PSU. There is no power switch on the device.
  5. 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 AC and DC LEDs on each power supply are lit green.

    If the status LED is lit amber, remove power from the power supply, and replace the power supply (Maintain the QFX5240 Power System). Do not remove the power supply until you have a replacement power supply ready: the power supplies must be installed in the switch to ensure proper airflow.