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Maintain the QFX5120 Power System

 

Remove a Power Supply from a QFX5120 Switch

We ship QFX5120 switches with 650-W AC or DC two power supplies preinstalled in the rear panel. 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.

Before you remove a power supply from a QFX5120:

  • 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:

    • ESD grounding strap—not provided

    • Antistatic bag or an antistatic mat—not provided

    • Number 2 Phillips (+) screwdriver—not provided

Caution

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

To remove a power supply from a QFX5120:

  1. Place the antistatic bag or the antistatic mat on a flat, stable surface.
  2. 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 switch.Note

    If only one power supply is installed in your QFX5120, you need to power off the switch before removing the power supply.

  3. Disconnect power to the switch:

    • AC power supply—If the AC power source outlet has a power switch, set it to the off position. If the AC power source outlet does not have a power switch, gently pull out the male 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 female 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.

    • High-voltage power supply—Press the latch on the power cord and remove the power source cables from the power supply.

    • On the QFX5120-32C switch, push the ejector lever inward.

    • On the QFX5120-48Y or QFX5120-48T switch, push the ejector lever toward the handle until it stops.

  5. Grasp the power supply handle and pull firmly to slide the power supply halfway out of the chassis.
  6. 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.

    Figure 1 shows how to remove an AC power supply from a QFX5120-32C switch and Figure 2 shows how to remove a DC power supply from a QFX5120-32C switch.

    Figure 3 shows how to remove an AC power supply from a QFX5120-48Y or QFX5120-48T switch and Figure 4 shows how to remove a DC power supply from a QFX5120-48Y or QFX5120-48T switch. The procedure to remove a high-voltage power supply is the same as the procedure to remove an AC power supply from a QFX5120-48Y or QFX5120-48T switch.

    Figure 1: Remove an AC Power Supply from a QFX5120-32C Switch
    Remove an AC
Power Supply from a QFX5120-32C Switch
    Figure 2: Remove a DC Power Supply from a QFX5120-32C Switch
    Remove a DC
Power Supply from a QFX5120-32C Switch
    Figure 3: Remove an AC Power Supply from a QFX5120-48Y or QFX5120-48T Switch
    Remove
an AC Power Supply from a QFX5120-48Y or QFX5120-48T Switch
    Figure 4: Remove a DC Power Supply from a QFX5120-48Y or QFX5120-48T Switch
    Remove
a DC Power Supply from a QFX5120-48Y or QFX5120-48T Switch
  7. Place the power supply in the antistatic bag or on the antistatic mat placed on a flat, stable surface.Note

    You must install both the power supplies and they must be operational for optimal functioning of the switch.

    Caution

    Do not mix:

    • AC and DC power supplies in the same chassis.

    • Power supplies with different airflow directions in the same chassis.

    • Fan modules and power supplies with different airflow directions in the same chassis.

    • 650-W and 850-W power supplies in the same QFX5120-48T chassis.

  8. Install the replacement power supply.

Install a Power Supply in a QFX5120 Switch

The power supply in QFX5120 switches is a hot-removable and hot-insertable field-replaceable unit (FRU) installed in the rear panel of the switch: You can remove and replace it without powering off the switch or disrupting switch functions.

Note

Each power supply is a hot-removable and hot-insertable field-replaceable unit (FRU) when the second power supply is installed and running.

Caution

Do not mix:

  • AC and DC power supplies in the same chassis.

  • 650-W and 850-W power supplies in the same QFX5120-48T chassis.

  • Power supplies with different airflow directions in the same chassis.

  • Power supplies and fan modules with different airflow directions in the same chassis.

Before you install a power supply:

  • Ensure you understand how to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

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

    • ESD grounding strap—not provided

    • Number 2 Phillips (+) screwdriver—not provided

Note

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

Figure 5 shows how to install an AC power supply in a QFX5120-32C switch and Figure 6 shows how to install a DC power supply in a QFX5120-32C switch.

Figure 7 shows how to install an AC power supply in a QFX5120-48Y or QFX5120-48T switch. Figure 8 shows how to install a DC power supply in a QFX5120-48Y or QFX5120-48T switch. The procedure to install a high-voltage power supply is the same as the procedure to install an AC power supply in a QFX5120-48Y or QFX5120-48T switch.

To install a power supply in the switch:

  1. Ensure that you have the correct power supply.

    If you are installing a power supply with a red handle in a QFX5120-32C switch, verify that the label on the fan module installed is F2B. If you are installing a power supply with a blue handle in a QFX5120-32C switch, verify that the label on the fan module installed is B2F.

    If you are installing a power supply with a Juniper Gold handle in a QFX5120-48Y or QFX5120-48T switch, verify that the label on the fan module installed is AIR OUT. If you are installing a power supply with a Juniper Azure Blue handle in a QFX5120-48Y or QFX5120-48T switch, verify that the label on the fan module installed is AIR IN.

  2. 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 switch.
  3. Taking care not to touch power supply pins, leads, or solder connections, remove the power supply from the bag.
  4. Using both hands, place the power supply in the power supply slot on the rear panel of the switch and slide it in until it is fully seated and the ejector lever fits into place.
    Figure 5: Install an AC Power Supply in a QFX5120-32C Switch
    Install
an AC Power Supply in a QFX5120-32C Switch
    Figure 6: Install a DC Power Supply in a QFX5120-32C Switch
    Install
a DC Power Supply in a QFX5120-32C Switch
    Figure 7: Install an AC Power Supply in a QFX5120-48Y or QFX5120-48T Switch
    Install an AC Power Supply in a QFX5120-48Y or QFX5120-48T Switch
    Figure 8: Install a DC Power Supply in a QFX5120-48Y or QFX5120-48T Switch
    Install a DC Power Supply in a QFX5120-48Y or QFX5120-48T Switch