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Maintaining the EX4650 Power System

 

Removing a Power Supply from an EX4650 Switch

All EX4650 switches 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.

Before you remove a power supply from an EX4650, 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 an EX4650:

  • ESD grounding strap

  • Antistatic bag or antistatic mat

  • Phillips (+) screwdriver, number 2 (not provided)

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 an EX4650:

  1. Place the antistatic bag or 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 EX4650, 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 (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 ejector 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 the 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 an EX4650
Removing a
Power Supply from an EX4650

Installing an AC Power Supply in an EX4650 Switch

The AC power supply in EX4660 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 a power supply without powering off the switch or disrupting switch functions.

Caution

Do not mix:

  • AC and DC power supplies in the same chassis.

  • Power supplies with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the same chassis.

  • Fan modules with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the same chassis.

  • Power supplies and fan modules with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the same chassis.

Before you install an AC power supply in the switch:

Ensure that you have the following parts and tools available to install the power supply:

Note

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

  • ESD grounding strap

  • Phillips (+) screwdriver, number 2(not provided)

Note

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

To install an AC power supply in the switch, see Figure 2 shows how to install an AC power supply. The power supply slots are at the right end of the rear panel.

  1. Ensure that you have the correct power supply. The label on the power supply must match the label AFI or AFO on the installed fan module.
  2. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  3. Taking care not to touch the 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 2: Installing an AC Power Supply in an EX4650 Switch
Installing
an AC Power Supply in an EX4650 Switch