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Maintaining the EX9253 Power System

Powering Off an EX9253 Switch

Before you begin to power off the 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 power off an EX9253 switch:

    • An ESD wrist strap

    • An external management device such as a PC

    • The appropriate cable to connect the external management device to the console port labeled CON on the switch

Note:

After powering off a power supply, wait at least five seconds before turning it back on.

To power off the switch:

  1. Connect a management device to the console (see Connect a Device to a Management Console Using an RJ-45 Connector).
  2. Take the line cards offline by issuing the following CLI command on the external management device connected to the switch:
  3. Power off the backup RE by issuing the following CLI command on the primary RE:
  4. Power off the primary RE by issuing the following CLI command on the primary RE:

    The switch shuts down and the console displays the message Power down.

To power on the switch again, press the button labeled OFFLINE on the primary Routing Engine of the switch for one second or remove the RE and install it.

You can take the switch offline by pressing the button labeled OFFLINE on the primary Routing Engine of the switch for three seconds.

Removing an AC Power Supply from an EX9253 Switch

Before you begin to remove an AC power supply:

Ensure that you have the following parts and tools available:

  • An ESD wrist strap

  • A replacement power supply or a cover panel for the power supply slot

The AC power supply in an EX9253 switch is a hot-removable and hot-insertable field-replaceable unit (FRU). You can remove and replace it while the switch is running without turning off power to the switch or disrupting switching functions. A minimum of two high line power supplies or three low line must be installed in the switch for non-redundant operation. To ensure proper operation of the switch, you must install a replacement power supply shortly after removing a power supply from the chassis. The power supplies are installed in the slots labeled PSM0 through PSM5 on the rear of the chassis.

CAUTION:

Before you remove a power supply, ensure that you have power supplies sufficient to power the switch that remains in the chassis (see EX9253 Power System).

CAUTION:

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

Note:

After powering off a power supply, wait for at least 60  seconds before turning it back on.

To remove an AC power supply from an EX9253 switch (see Figure 1):

  1. Switch off the dedicated customer-site circuit breaker for the power supply, and remove the power cord from the AC power source. Follow the instructions for your site.
  2. Verify that the input status LED on the power supply is not lit.
  3. 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.
  4. Remove the power cord from the AC appliance inlet on the AC power supply faceplate.
  5. Press the ejector lever on the side of the AC power supply to disconnect the power supply from the chassis.
  6. Pull the power supply straight out of the chassis by using the handle.
  7. Either replace the power supply promptly or install a cover panel over the empty slot.
    Figure 1: Removing an AC Power SupplyRemoving an AC Power Supply

Installing an AC Power Supply in an EX9253 Switch

Before you begin to install an AC power supply:

Ensure that you have the following parts and tools available:

  • An ESD wrist strap

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

The AC power supply in an EX9253 switch is a hot-insertable and hot-removable field-replaceable unit (FRU). You can remove and replace it while the switch is running without turning off power to the switch or disrupting switching functions. You can install up to six power supplies in an EX9253 switch. A minimum of two high line power supplies or three low line must be installed in the switch for non-redundant operation. The power supplies are installed in the slots labeled PSM0 through PSM5 on the rear of the chassis.

CAUTION:

EX9253 switches use either AC or DC power supplies. Do not mix AC and DC power supplies in a switch.

Note:

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

To install an AC power supply in an EX9253 switch (see Figure 2):

  1. 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.
  2. If the power supply slot has a cover panel on it, remove the cover panel, and save the cover panel for later use.
  3. Taking care not to touch power supply components, pins, leads, or solder connections, remove the power supply from its bag by using the handle.
  4. Using both hands, hold and slide the AC power supply straight into the chassis until the power supply is fully seated in the power supply slot. The power supply faceplate must align with the power supply faceplate or the cover panel installed in the adjacent power supply slot.
    Figure 2: Installing an AC Power SupplyInstalling an AC Power Supply
  5. Press the latch located on the left side of the power supply to slide it into the chassis.
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.

To connect power to an AC power supply, see Connecting AC Power to an EX9253 Switch and Powering on the Switch.

Removing a DC Power Supply in an EX9253 Switch

Before you begin to remove a DC power supply:

Ensure that you have the following parts and tools available:

  • An ESD wrist strap

  • A socket screwdriver

  • A replacement power supply or cover panel for the power supply slot

The DC power supply in an EX9253 switch is a hot-removable and hot-insertable field-replaceable unit (FRU). You can remove and replace it while the switch is running without turning off power to the switch or disrupting switching functions. To ensure proper operation of the switch, you must install a replacement power supply shortly after removing a power supply from the chassis. The power supplies are installed in the slots labeled PSM0 through PSM5 on the rear of the chassis.

CAUTION:

Before you remove a power supply, ensure that you have power supplies sufficient to power the switch that remains in the chassis (see EX9253 Power System).

CAUTION:

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

Warning:

Before performing DC power procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position.

Note:

After powering off a power supply, wait for at least 60 seconds before turning it back on.

To remove a DC power supply from an EX9253 switch:

  1. Switch off the dedicated customer site circuit breaker for the power supply being removed. Follow your site's procedures for ESD.
  2. Make sure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cables might become active during the removal process.
  3. Verify that the input status LED on the power supply is not lit.
  4. 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.
  5. Move the DC circuit breaker on the DC power supply faceplate to the off position.
  6. Remove the clear plastic cover protecting the terminal studs on the faceplate.
  7. Using a socket screwdriver, remove the screws from the DC power terminals.
  8. Remove the cable lugs from the terminal studs (see Figure 3).
    Figure 3: Removing DC Power CablesRemoving DC Power Cables
  9. Carefully move the power cables out of the way .
  10. Press the latch located on the DC power supply, to release it from the chassis.
  11. Pull the power supply straight out of the chassis (see Figure 4).
    Figure 4: Removing a DC Power SupplyRemoving a DC Power Supply
  12. Either replace a power supply promptly or install a cover panel over the empty slot.

Installing a DC Power Supply in an EX9253 Switch

Before you begin to install a DC power supply:

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

  • Ensure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cable leads might become active during installation.

Ensure that you have the following parts and tools available:

  • An ESD wrist strap

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

The DC power supply in an EX9253 switch is a hot-removable and hot-insertable field-replaceable unit (FRU). You can remove and replace it while the switch is running without turning off power to the switch or disrupting switching functions. You can install up to six DC power supplies in an EX9253 switch. The power supplies are installed in the slots labeled PSM0 through PSM5 on the rear of the chassis.

CAUTION:

EX9253 switches use either AC or DC power supplies. Do not mix AC and DC power supplies in a switch.

Warning:

Before performing DC power procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position.

To install a DC power supply in an EX9253 switch (see Figure 5):

  1. 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.
  2. If the power supply slot has a cover panel on it, remove the cover panel, and save the cover panel for later use.
  3. Taking care not to touch power supply components, pins, leads, or solder connections, remove the power supply from its bag.
  4. Move the DC circuit breaker on the power supply faceplate to the off position.
  5. Using both hands, hold and slide the DC power supply straight into the chassis until the power supply is fully seated in the power supply slot. The power supply faceplate must align with the power supply faceplate or the cover panel installed in the adjacent power supply slot.
    Figure 5: Installing a DC Power SupplyInstalling a DC Power Supply
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.

To connect power to a DC power supply, see Connecting DC Power to an EX9253 Switch and Powering on the Switch.

Maintaining Power Supplies in EX9253 Switches

Purpose

For optimum switch performance, verify the condition of the power supplies installed in the chassis.

Action

On a regular basis:

  • Check the status of the power supplies by issuing the show  chassis  environment  pem command. The output for EX9253 switches is similar to the following:

  • Make sure that the power and grounding cables are arranged so that they do not obstruct access to other switch components.

  • Routinely check the status LEDs on the power supply faceplate to determine whether the power supplies are functioning normally.

  • Check the alarm LED on the front panel. Power supply failure or removal triggers an alarm that causes the LED to light. You can display the associated error messages by issuing the following command:

  • Periodically inspect the site to ensure that the grounding and power cables connected to the switch are securely in place and that there is no moisture accumulating near the switch.