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Maintain the QFX5240 Power System

A QFX5240 power supply unit (PSU) is a hot-removable and hot-insertable field-replaceable unit (FRU). You can replace power supplies without powering off the switch or disrupting the switching function.

Remove a Power Supply Unit from QFX5240 Switches

We ship the QFX5240 switches from the factory with two power supplies.

Before you remove a PSU from QFX5240 switches, ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage.

Ensure that you have the following parts and tools available to remove a PSU from a QFX5240 switch:

  • ESD grounding strap

  • Antistatic bag or an antistatic mat

  1. Place the antistatic bag or the antistatic mat on a flat, stable surface.
  2. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the rack.
    Note:

    If only one power supply is installed in your QFX5240 switch, you need to power off the switch before removing the power supply. See Power Off a QFX5240 Switch.
  3. Disconnect power to the switch:

    • AC power supply—If the AC power source outlet has a power switch, set it to the OFF (O) position. If the AC power source outlet does not have a power switch, gently pull out the plug end of the power cord connected to the power source outlet.

  4. Remove the power source cable from the power supply faceplate:

    • AC power supply—Remove the power cord from the power supply faceplate by detaching the power cord retainer and gently pulling out the socket end of the power cord connected to the power supply faceplate.

  5. Press the power supply handle from the side.
  6. Grasp the power supply handle and pull firmly to slide the power supply halfway out of the chassis. Figure 1 shows how to remove an AC power supply unit from a QFX5240 switch.
    Figure 1: Remove an AC PSU from a QFX5240 Switch Remove an AC PSU from a QFX5240 Switch
  7. Place one hand under the power supply to support it and slide it completely out of the chassis. Take care not to touch power supply components, pins, leads, or solder connections.
  8. Place the power supply in the antistatic bag or on the antistatic mat placed on a flat, stable surface.
  9. Replace with another power supply module.

Install an AC Power Supply Unit in QFX5240 Switches

  • Before you install a power supply in QFX5240 switches, ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage.

  • Ensure that the airflow direction of the power supply is the same as the chassis. Labels on the power supply handle indicate the direction of airflow. See QFX5240 Cooling System for more information.

To install a power supply in a QFX5240 Switch:

  1. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the rack.
  2. Take care not to touch power supply components, pins, leads, or solder connections as you remove the power supply from its bag.
    CAUTION:

    Verify that the direction of the arrow on the power supply handle matches the direction of airflow in the chassis. Ensure that each power supply you install in the chassis has the same airflow direction. If you install power supplies with two different airflow directions, Junos OS raises an alarm, and the status (ALM) LED blinks amber.
  3. If the power supply has a protective plastic wrap, peel and remove the plastic wrap from all four sides of the power supply.
  4. Using both hands, place the power supply in the power supply slot on the FRU panel of the switch and slide it in until it is fully seated.
Figure 2: Install an AC PSU in a QFX5240 Switch Install an AC PSU in a QFX5240 Switch
Note:

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

If you have a Juniper Care service contract, register any addition, change, or upgrade of hardware components at https://www.juniper.net/customers/support/tools/updateinstallbase/ . Failure to do so can result in significant delays if you need replacement parts. This note does not apply if you replace existing components with the same type of component.