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Maintaining the EX4550 Power System

 

Removing an AC Power Supply from an EX4550 Switch

The power supplies in EX4550 switches are hot-removable and hot-insertable field-replaceable units (FRUs) installed in the rear panel of the switch: You can remove and replace them without powering off the switch or disrupting switch functions.

Before you remove a power supply from an EX4550 switch, 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 EX4550 switch:

  • ESD grounding strap

  • Antistatic bag or an antistatic mat

  • Replacement power supply or a cover panel for the power supply slot

Caution

We recommend that you install either a replacement power supply or a cover panel in the empty power supply slot to avoid chassis overheating and dust accumulation.

To remove a power supply from an EX4550 switch (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.
  3. If the AC power source outlet has a power switch, set it to the off (O) position.
  4. Gently pull out the plug end of the power cord connected to the power source outlet.
  5. 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.
  6. Slide the ejector lever toward the left until the power supply is unseated.
  7. Grasp the power supply handle and pull firmly to slide the power supply halfway out of the chassis.
  8. 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.
  9. Place the power supply in the antistatic bag or on the antistatic mat placed on a flat, stable surface.
  10. If you are not replacing the power supply, install the cover panel over the slot.
Figure 1: Removing an AC Power Supply from an EX4550 Switch
Removing an
AC Power Supply from an EX4550 Switch

Installing an AC Power Supply in an EX4550 Switch

The AC power supply in EX4550 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.

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:

  • ESD grounding strap

Caution

Do not mix:

  • AC and DC power supplies in the same chassis.

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

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):

  1. Ensure that you have the correct power supply. The label AFI or AFO on the power supply must match the label AIR IN (AFI) or AIR OUT (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. If the power supply slot has a cover panel on it, with one hand slide the ejector lever toward the left until it stops and using the other hand pull the handle of the cover panel outward to remove it. Save the cover panel for later use.
  4. Taking care not to touch power supply pins, leads, or solder connections, remove the power supply from the bag.
  5. 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. You will hear a distinct click when the power supply is fully seated in the chassis.
Figure 2: Installing an AC Power Supply in an EX4550 Switch
Installing an AC
Power Supply in an EX4550 Switch
Note

If you have a Juniper J-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.

Removing a DC Power Supply from an EX4550 Switch

The power supply in EX4550 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.

Before you begin removing a power supply from the switch:

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

  • ESD grounding strap

  • Phillips (+) screwdriver, number 2

  • An antistatic bag or an antistatic mat

  • Replacement power supply or a cover panel for the power supply slot

Caution

We recommend that you install either a replacement power supply or a cover panel in the empty power supply slot to avoid chassis overheating and dust accumulation.

To remove a power supply from the switch (see Figure 3):

  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.
  3. Make sure that the voltage across the DC power source cables leads is 0 V and that there is no chance that the cables might become active during the removal process.
  4. Remove the plastic cover from the input terminals by sliding the cover either to the left or right.
  5. Unscrew the locking screws counterclockwise by using the screwdriver.
  6. Remove the cable lugs from the input DC terminals.
  7. Slide the ejector lever toward the left until the power supply is unseated.
  8. Grasp the power supply handle and pull firmly to slide the power supply halfway out of the chassis.
  9. Taking care not to touch power supply pins, leads, or solder connections, place one hand under the power supply to support it. Grasp the power supply handle with your other hand and pull the power supply completely out of the chassis.
  10. Place the power supply in the antistatic bag or on the antistatic mat placed on a flat, stable surface.
  11. If you are not replacing the power supply, install the cover panel over the slot.
Figure 3: Removing a DC Power Supply from an EX4550 Switch
Removing a DC Power
Supply from an EX4550 Switch

Installing a DC Power Supply in an EX4550 Switch

The DC power supply in EX4550 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.

Before you install a DC power supply in the switch:

Ensure that you have the following parts and tools available to install a DC power supply in the switch chassis:

  • ESD grounding strap

Caution

Do not mix:

  • AC and DC power supplies in the same chassis.

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

Note

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

To install a DC power supply in the switch (see Figure 4):

  1. Ensure that you have the correct power supply. The label AFI or AFO on the power supply must match the label AIR IN (AFI) or AIR OUT (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. If the power supply slot has a cover panel on it, with one hand slide the ejector lever toward the left until it stops and using the other hand pull the handle of the cover panel outward to remove it. Save the cover panel for later use.
  4. Taking care not to touch power supply pins, leads, or solder connections, remove the power supply from the bag.
  5. 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. You will hear a distinct click when the power supply is fully seated in the chassis.
Figure 4: Installing a DC Power Supply in an EX4550 Switch
Installing a DC
Power Supply in an EX4550 Switch
Note

If you have a Juniper J-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.