Maintaining the EX4300 Power System

 

Removing an AC Power Supply from an EX4300 Switch

The power supplies in EX4300 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 EX4300 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 EX4300 switch:

  • ESD grounding strap

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

  • 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 prevent chassis overheating and dust accumulation.

Note

The power supply slots are at the right end of the rear panel on 24-port and 48-port switches, and at the left end on 32-port switches. Figure 1 shows how to remove an AC power supply from 24-port or 48-port switches except EX4300-48MP and EX4300-48MP-S switches. The procedure is the same for 32-port switches. Figure 2 shows how to remove an AC power supply from EX4300-48MP and EX4300-48MP-S switches.

  1. Place the antistatic bag or the antistatic mat on a flat, stable surface.
  2. Wrap and fasten one end of an 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 EX4300 switch, you need to power off the switch before removing the power supply.

  3. If the AC power source outlet has a power switch, set it to the OFF (O) position.
  4. Gently pull out the male 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 female 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 EX4300 Switches Except EX4300-48MP and EX4300-48MP-S Switches
Removing an
AC Power Supply from EX4300 Switches Except EX4300-48MP and EX4300-48MP-S
Switches
Figure 2: Removing an AC Power Supply from EX4300-48MP and EX4300-48MP-S Switches
Removing
an AC Power Supply from EX4300-48MP and EX4300-48MP-S Switches

Installing an AC Power Supply in an EX4300 Switch

The AC power supply in EX4300 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.

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:

  • ESD grounding strap

  • Phillips (+) screwdriver, number 2

Note

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

The power supply slots are at the right end of the rear panel on 24-port and 48-port switches, and at the left end on 32-port switches. Figure 3 shows how to install an AC power supply in 24-port or 48-port switches except EX4300-48MP and EX4300-48MP-S switches. The procedure is the same for 32-port switches. Figure 4 shows how to install an AC power supply in EX4300-48MP and EX4300-48MP-S switches.

To install an AC power supply in the switch:

  1. Ensure that you have the correct power supply. The label AIR IN (AFI) or AIR OUT (AFO) on the power supply must match the label AIR IN (AFI) or AIR OUT (AFO) on the installed fan module.
  2. Wrap and fasten one end of an ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.
  3. If the power supply slot has a cover panel on it, loosen the captive screws on the cover panel by using your fingers or the screwdriver. Hold the captive screw and gently pull it outward to remove the cover panel. 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.
Figure 3: Installing an AC Power Supply in EX4300 Switches Except EX4300-48MP and EX4300-48MP-S Switches
Installing
an AC Power Supply in EX4300 Switches Except EX4300-48MP and EX4300-48MP-S
Switches
Figure 4: Installing an AC Power Supply in EX4300-48MP and EX4300-48MP-S Switches
Installing
an AC Power Supply in EX4300-48MP and EX4300-48MP-S Switches
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 EX4300 Switch

The power supply in EX4300 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 prevent chassis overheating and dust accumulation.

Note

The power supply slots are at the right side of the rear panel on 24-port and 48-port switches, and at the left side on 32-port switches. Figure 5 shows how to remove a DC power supply from 24-port or 48-port switches except EX4300-48MP and EX4300-48MP-S switches. The procedure is the same for 32-port switches. EX4300-24T, EX4300-24P, EX4300-32F, EX4300-48T, EX4300-48T-AFI, EX4300-48P, EX4300-48MP, and EX4300-48MP-S models do not support DC power. EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-32F-DC, EX4300-48T-S, EX4300-48T-DC, EX4300-48T-DC-AFI, and EX4300-48P-S models support DC power.

  1. Place the antistatic bag or the antistatic mat on a flat, stable surface.
  2. Wrap and fasten one end of an ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.
  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 5: Removing a DC Power Supply from EX4300 Switches Except EX4300-48MP and EX4300-48MP-S Switches
Removing a DC Power
Supply from EX4300 Switches Except EX4300-48MP and EX4300-48MP-S Switches

Installing a DC Power Supply in an EX4300 Switch

The DC power supply in EX4300 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.

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 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

  • Phillips (+) screwdriver, number 2

Note

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

The power supply slots are at the right side of the rear panel on 24-port and 48-port switches, and at the left side on 32-port switches. Figure 6 shows how to install a DC power supply in 24-port or 48-port switches except EX4300-48MP and EX4300-48MP-S switches. The procedure is the same for 32-port switches. EX4300-24T, EX4300-24P, EX4300-32F, EX4300-48T, EX4300-48T-AFI, EX4300-48P, EX4300-48MP, and EX4300-48MP-S models do not support DC power. EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-32F-DC, EX4300-48T-S, EX4300-48T-DC, EX4300-48T-DC-AFI, and EX4300-48P-S models support DC power.

To install a DC power supply in the switch:

  1. Ensure that you have the correct power supply. The label AIR IN (AFI) or AIR OUT (AFO) on the power supply must match the label AIR IN (AFI) or AIR OUT (AFO) on the installed fan module.
  2. Wrap and fasten one end of an ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.
  3. If the power supply slot has a cover panel on it, loosen the captive screws on the cover panel by using your fingers or the screwdriver. Hold the captive screw and gently pull it outward to remove the cover panel. 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.
Figure 6: Installing a DC Power Supply in EX4300 Switches Except EX4300-48MP and EX4300-48MP-S Switches
Installing a DC
Power Supply in EX4300 Switches Except EX4300-48MP and EX4300-48MP-S
Switches
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.