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Maintaining QFX5110 Power Supplies

Removing a Power Supply from a QFX5110

Before you remove a power supply from a QFX5110, ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

Ensure that you have the following parts and tools available to remove a power supply from a QFX5110:

  • ESD grounding strap

  • Antistatic bag or an antistatic mat

  • Phillips (+) screwdriver, number 2 (DC power supply)

All QFX5110 switches, except the QFX5110-32Q-CHAS are shipped from the factory with two power supplies. 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 replacement power supplies in the two slots next to the fan modules without powering off the switch or disrupting the switching function.

CAUTION:

Replace the power supply with a new power supply within 1 minute of removal to prevent chassis overheating.

To remove a power supply from a QFX5110 (see Figure 1):

  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 chassis.
    Note:

    If only one power supply is installed in your QFX5110, you need to power off the switch before removing the power supply. See Powering Off a QFX5110.

  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.

    • DC power supply—Switch the circuit breaker on the panel board that services the DC circuit to the off position.

  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.

    • DC power supply—Remove the screws securing the ring lugs attached to the power source cables to the power supply using the screwdriver, and remove the power source cables from the power supply. Replace the screws on the terminals and tighten them.

  5. Slide the locking lever toward the handle until it stops.
  6. Grasp the power supply handle and pull firmly to slide the power supply halfway out of the chassis.
  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.
Figure 1: Removing a Power Supply from a QFX5110 Removing a Power Supply from a QFX5110

Installing a Power Supply in a QFX5110

All QFX5110 switches, except the QFX5110-32Q-CHAS are shipped from the factory with two power supplies. 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 replacement power supplies in the two slots next to the fan modules without powering off the switch or disrupting the switching function.

To install a power supply in a QFX5110 (see Figure 3):

  1. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  2. Taking care not to touch power supply components, pins, leads, or solder connections, 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. Using both hands, lift the power supply and place it over the EMI gasket (if present) in the power supply slot and slide the power supply into place.
    Figure 2: Installing a Power Supply in a QFX5110-32Q with EMI GasketInstalling a Power Supply in a QFX5110-32Q with EMI Gasket
    Note:

    The EMI gasket is not present in QFX5110-48S switch.

  4. Ensure the power supply is fully seated and the locking lever is in place.
    Figure 3: Installing a Power Supply in a QFX5110-48S Installing a Power Supply in a QFX5110-48S
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.

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