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Maintaining the Power System in an EX4500 Switch

 

Replacing Redundant AC Power Supplies in an EX4500 Switch Without Disrupting Switch Functions

The power supplies in an EX4500 switch are field-replaceable units (FRUs) and are designed to be hot-swapped while the switch is operating. You can remove and replace the power supply in the top slot and the power supply in the bottom slot, one at a time, without disrupting switch functions.

Before replacing the power supplies in the switch:

  • Ensure that you have the correct replacement power supplies for your EX4500 switch model. The color of the ejector lever on each power supply must match the color of the labels visible through the fan tray vents.

    • Orange for Intake—The back-to-front model has an orange ejector lever on the power supplies and an orange INTAKE label visible through the fan tray vents.

    • Green for Exhaust—The front-to-back model has a green ejector lever on the power supplies and a green EXHAUST label visible through the fan tray vents.

      Caution

      Operating the switch with an incorrect power supply might cause the chassis to overheat.

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

  • If a grounding strap is not available, take these equivalent precautions:

    • Before removing a component, touch the exposed, bare metal of the switch to ground yourself before handling the component.

    • Before installing a component, hold the component in its antistatic bag in one hand and touch the exposed, bare metal of the switch with the other hand.

Ensure that you have the following parts and tools available to remove and replace the power supplies in the switch chassis:

  • ESD grounding strap (not provided)

  • Two antistatic bags or mats (not provided)

  • Power supply cover panel to cover the empty power supply slot, if you do not plan to install a replacement power supply immediately (provided)

To replace both power supplies in an EX4500 switch while the switch is operational, remove and replace the power supply in the top slot first, and then repeat the procedure for the power supply in the bottom slot.

Note

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

Replacing the Power Supply in the Top Slot

To replace the power supply in the top slot of the switch:

  1. Ensure that the EX4500 switch you are working on is operating normally, with both power supplies turned on, by verifying that the LED on each power supply is lit steadily green. See Figure 1.
    Figure 1: Verify Green Power Supply LEDs for Normal Operation
    Verify Green Power
Supply LEDs for Normal Operation
  2. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the lower right front of the chassis—or touch the exposed, bare metal of the switch to ground yourself before handling a component.
  3. To remove AC power from the old power supply:
    1. Identify the AC power source outlet that is powering the old power supply.

    2. If the AC power source outlet has an on/off switch, set it to the OFF (0) position.

    3. Gently pull the plug end of the power cord for the old power supply out of the AC power source outlet.

  4. To remove the power supply cord from the old power supply:
    1. On the power supply, turn the adjustment nut of the power cord retainer clockwise until you can see the power cord.

    2. Pull the power cord out of the slot in the adjustment nut.

    3. Unplug the power cord from the AC appliance inlet on the power supply. Save the cord.

    4. Remove the power cord retainer clip by pushing it to one side, squeezing both sides of the clip, and pulling it completely out of the power supply. Save the clip.

  5. To remove the old power supply from the switch (see Figure 2):
    1. Unseat the power supply by pressing the orange or green ejector lever next to the AC appliance inlet.

    2. Grasp the power supply handle and pull firmly, keeping one hand under the power supply to support it as you slide it out of the chassis.

      Caution

      Do not leave the power supply slot empty for a long time while the switch is operational. Either replace the power supply promptly or install a cover panel over the empty slot.

    3. Place the old power supply in an antistatic bag or on an antistatic mat.

      Figure 2: Removing an AC Power Supply from an EX4500 Switch
      Removing
an AC Power Supply from an EX4500 Switch
  6. To install the replacement power supply in the switch (see Figure 3):
    1. If you have not already done so, attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the lower right front of the chassis—or hold the component in its antistatic bag in one hand and touch the exposed, bare metal of the switch with the other hand.

    2. Taking care not to touch power supply pins, leads, or solder connections, remove the replacement power supply from its antistatic bag.

    3. Using both hands, place the replacement power supply in the empty power supply slot in the switch and slide it in until you hear a distinct click sound, indicating that the power supply is fully seated in the chassis.

      Figure 3: Sliding a Replacement Power Supply into the EX4500 Switch
      Sliding a Replacement
Power Supply into the EX4500 Switch
  7. To connect AC power to the replacement power supply (see Figure 4):
    1. Ensure that you have the power cord retainer clip and the power cord from the old power supply you removed in Step 4.

    2. Squeeze the sides of the retainer clip, and insert the L-shaped ends into the holes in the bracket on either side of the appliance inlet on the replacement power supply.

    3. Insert the socket end of the power cord into the AC appliance inlet on the replacement power supply.

    4. Push the retainer clip toward the cord until the cord slides into the slot on the adjustment nut.

    5. Turn the adjustment nut clockwise until it is tight against the base of the coupler and the slot in the nut is turned 90º from the top of the switch.

    6. If the AC power source outlet you are using has an on/off switch, ensure that it is set to the OFF (0) position.

    7. Gently insert the plug end of the power cord plug into the AC power source outlet, and set the on/off switch on the outlet (if any) to the ON (|) position

      Figure 4: Connecting the Replacement Power Supply Cord
      Connecting the
Replacement Power Supply Cord
  8. To ensure that the replacement power supply is operating normally and both power supplies are providing redundant power to the switch, verify that both power supply LEDs (see Figure 1) are lit steadily green
  9. To replace the power supply in the bottom slot, go on to Replacing the Power Supply in the Bottom Slot.

Replacing the Power Supply in the Bottom Slot

To replace the power supply in the bottom slot of the switch:

  1. If you have not already done so, ensure that the EX4500 switch you are working on is operating normally, with both power supplies turned on, by verifying that the LED on each power supply is lit steadily green (see Figure 1).
  2. If you have not already done so, attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the lower right front of the chassis—or touch the exposed, bare metal of the switch to ground yourself before handling a component.
  3. Remove power from the old power supply in the bottom slot (see Step 3 in Replacing the Power Supply in the Top Slot).
  4. Remove the power cord from the old power supply in the bottom slot (see Step 4 in Replacing the Power Supply in the Top Slot).
  5. Remove the bottom old power supply from the switch (see Step 5 in Replacing the Power Supply in the Top Slot).Caution

    Do not leave the power supply slot empty for a long time while the switch is operational. Either replace the power supply promptly or install a cover panel over the empty slot.

  6. Install the bottom replacement power supply (see Step 6 in Replacing the Power Supply in the Top Slot).
  7. Connect power to the bottom replacement power supply (see Step 7 in Replacing the Power Supply in the Top Slot).
  8. To ensure that the replacement power supply is operating normally and both power supplies are providing redundant power to the switch, verify that both power supply LEDs (see Figure 1) are lit steadily green.

Removing an AC Power Supply from an EX4500 Switch

The power supply in EX4500 switches is a hot-removable and hot-insertable field-replaceable unit (FRU): 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:

  • An antistatic bag or an antistatic mat

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

Caution

Do not leave the power supply slot empty for a long time while the switch is operational. Either replace the power supply promptly or install a cover panel over the empty slot.

To remove a power supply from the switch (see Figure 5):

  1. Place the antistatic bag or the antistatic mat on a flat, stable surface.
  2. Attach the electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  3. Disconnect power from the switch by performing one of the following tasks:
    • If the AC power source outlet has a power switch, set it to the OFF (0) 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.

  4. Turn the adjustment nut of the power cord retainer counterclockwise till you can see the power cord. Pull the power cord from the slot in the adjustment nut.
  5. Remove the socket end of the power cord from the AC appliance inlet on the power supply faceplate.
  6. Push the power cord retainer clip to one side of the appliance inlet. Squeeze the two sides of the power cord retainer clip, and pull the L-shaped ends of the clip from the holes on each side of the AC appliance inlet to completely remove the power retainer clip.
  7. Push the ejector lever 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 Power Supply from an EX4500 Switch
Removing a Power
Supply from an EX4500 Switch

Installing an AC Power Supply in an EX4500 Switch

The power supply in EX4500 switches is a hot-removable and hot-insertable field-replaceable unit (FRU): 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:

Note

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

To install a power supply in the switch (see Figure 6):

  1. Ensure that you have the correct power supply. The color of the power supply's ejector lever must match the color of the intake or exhaust labels visible through the fan tray vents. See AC Power Supply in EX4500 Switches.Caution

    Operating the switch with an incorrect power supply might cause the chassis to overheat.

  2. Attach the electrostatic discharge (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, pull the handle of the cover panel outwards and 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. You will hear a distinct click sound when the power supply is fully seated in the chassis.
Figure 6: Installing a Power Supply in an EX4500 Switch
Installing
a Power Supply in an EX4500 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 EX4500 Switch

The power supply in EX4500 switches is a hot-removable and hot-insertable field-replaceable unit (FRU): 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:

  • Electrostatic discharge (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

Do not leave the power supply slot empty for a long time while the switch is operational. Either replace the power supply promptly or install a cover panel over the empty slot.

To remove a power supply from the switch (see Figure 7):

  1. Place the antistatic bag or the antistatic mat on a flat, stable surface.
  2. Attach the electrostatic discharge (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 using the screwdriver.
  6. Remove the cable lugs from the input DC terminals.
  7. Push the ejector lever 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 7: Removing a DC Power Supply from an EX4500 Switch
Removing a DC Power
Supply from an EX4500 Switch

Installing a DC Power Supply in an EX4500 Switch

The DC power supply in EX4500 switches is a hot-removable and hot-insertable field-replaceable unit (FRU): 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:

  • Electrostatic discharge (ESD) grounding strap

Note

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

To install a DC power supply in the switch (see Figure 8):

  1. Ensure that you have the correct power supply. The color of the power supply's ejector lever must match the color of the exhaust labels visible through the fan tray vents. See DC Power Supply in EX4500 Switches.Caution

    Operating the switch with an incorrect power supply might cause the chassis to overheat.

  2. Attach the electrostatic discharge (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, pull the handle of the cover panel outwards and 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. You will hear a distinct click sound when the power supply is fully seated in the chassis.
Figure 8: Installing a DC Power Supply in an EX4500 Switch
Installing
a DC Power Supply in an EX4500 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.