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Maintaining the SRX5400 Power System

 

Maintaining SRX5400 Services Gateway Power Supplies

Purpose

For optimum services gateway performance, verify the condition of the power supplies.

Action

On a regular basis:

  • To check the status of the power supplies, issue the show chassis environment pem command. The sample output below is of a chassis with DC power supplies:

    user@host> show chassis environment pem
  • Make sure that the power and grounding cables are arranged so that they do not obstruct access to other services gateway components.

  • Routinely check the status LEDs on the power supply faceplates and the craft interface to determine if the power supplies are functioning normally.

  • Check the red and yellow alarm LEDs on the craft interface. Power supply failure or removal triggers an alarm that causes one or both of the LEDs to light. You can display the associated error messages by issuing the following command:

    user@host> show chassis alarms
  • Periodically inspect the site to ensure that the grounding and power cables connected to the device are securely in place and that there is no moisture accumulating near the device.

Replacing an SRX5400 Services Gateway AC Power Supply

To replace an AC power supply, perform the following procedures:

Note

The SRX5400 Services Gateway and SRX5600 Services Gateway use the same power supply model.

  1. Removing an SRX5400 Services Gateway AC Power Supply

  2. Installing an SRX5400 Services Gateway AC Power Supply

Removing an SRX5400 Services Gateway AC Power Supply

The power supplies are located at the rear of the chassis. Each AC power supply weighs approximately 6.6 lb (3.0 kg).

Caution

Do not leave a power supply slot empty for more than 30 minutes while the services gateway is operational. For proper airflow, the power supply must remain in the chassis, or a blank panel must be used in an empty slot.

Note

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

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

  1. Switch off the dedicated facility circuit breaker for the power supply, and remove the power cord from the AC power source. Follow the ESD and disconnection instructions for your site.
  2. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to an ESD point.
  3. Move the AC switch next to the appliance inlet on the power supply to the off position (O).
  4. Unscrew the captive screws on the bottom edge of the power supply.
  5. Remove the power cord from the power supply.
  6. Pull the power supply straight out of the chassis.
Figure 1: Removing an AC Power Supply
Removing an
AC Power Supply

Installing an SRX5400 Services Gateway AC Power Supply

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

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to an ESD point.
  2. Move the AC switch next to the appliance inlet on the power supply to the off position (O).
  3. Using both hands, slide the power supply straight into the chassis until the power supply is fully seated in the chassis slot. The power supply faceplate should be flush with any adjacent power supply faceplate (see Figure 2).
  4. Tighten both captive screws at the bottom of the power supply.
  5. Attach the power cord to the power supply.
  6. Route the power cord along the cable restraint toward the left or right corner of the chassis. If needed to hold the power cord in place, thread plastic cable ties, which you must provide, through the openings on the cable restraint.
  7. Attach the power cord to the AC power source, and switch on the dedicated facility circuit breaker for the power supply. Follow the ESD and connection instructions for your site.
  8. Move the AC switch next to the appliance inlet on the power supply to the on position ( | ) and observe the status LEDs on the power supply faceplate. If the power supply is correctly installed and functioning normally, the AC OK and DC OK LEDs light steadily, and the PS FAIL LED is not lit.
Figure 2: Installing an AC Power Supply
Installing
an AC Power Supply

Replacing an SRX5400 Services Gateway AC Power Supply Cord

To replace an SRX5400 Services Gateway AC power supply cord, perform the following procedures:

  1. Disconnecting an SRX5400 Services Gateway AC Power Supply Cord

  2. Connecting an SRX5400 Services Gateway AC Power Supply Cord

Disconnecting an SRX5400 Services Gateway AC Power Supply Cord

Warning

Before working on an AC-powered device or near power supplies, unplug the power cord.

To disconnect the AC power cord:

  1. Unplug the power cord from the power source receptacle.
  2. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to an ESD point.
  3. Move the AC switch next to the appliance inlet on the power supply to the off position (O).
  4. Unplug the power cord from the appliance inlet on the power supply.

Connecting an SRX5400 Services Gateway AC Power Supply Cord

To connect the AC power cord:

  1. Locate a replacement power cord with the type of plug appropriate for your geographical location.
  2. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to an ESD point.
  3. Insert the power cord plug into an external AC power source receptacle.
  4. Connect the power cord to the power supply.
  5. Route the power cord along the cable restraint toward the left or right corner of the chassis. If needed to hold the power cord in place, thread plastic cable ties, which you must provide, through the openings on the cable restraint.
  6. Verify that the power cord does not block the air exhaust and access to services gateway components, or drape where people could trip on it.
  7. Switch the AC switch on the each power supply to the on position () and observe the status LEDs on the power supply faceplate. If the power supply is correctly installed and functioning normally, the AC OK and DC OK LEDs light steadily, and the PS FAIL LED is not lit.

Replacing an SRX5400 Services Gateway DC Power Supply

Removing an SRX5400 Services Gateway DC Power Supply

The power supplies are located at the rear of the chassis. Each DC power supply weighs approximately 6.2 lb (2.8 kg).

Caution

Do not leave a power supply slot empty for more than 30 minutes while the services gateway is operational. For proper airflow, the power supply must remain in the chassis, or a blank panel must be used in an empty slot.

Note

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

To remove a DC power supply (see Figure 3):

  1. Switch off the dedicated facility 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. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to an ESD point.
  4. Switch the circuit breaker on the power supply faceplate to the off position O.
  5. Remove the clear plastic cover protecting the terminal studs on the faceplate.
  6. Remove the nuts and washers from the terminal studs. (Use a 3/8-in. nut driver or socket wrench.)
  7. Remove the cable lugs from the terminal studs.
  8. Loosen the captive screws on the bottom edge of the power supply faceplate.
  9. Carefully move the power cables out of the way.
  10. Pull the power supply straight out of the chassis.
Figure 3: Removing a DC Power Supply
Removing
a DC Power Supply

Installing an SRX5400 Services Gateway DC Power Supply

Note

The SRX5400 Services Gateway and SRX5600 Services Gateway use the same power supply model.

To install a DC power supply:

  1. 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.
  2. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to an ESD point.
  3. Switch the circuit breaker on the power supply faceplate to the off position O.
  4. For a DC power supply, check the setting of the input mode switch. Use a sharp, nonconductive object to slide the switch to the desired position. Set the input mode switch to position 0 for 60-A input or position 1 for 80-A input. This setting is used by the power management software and must be set on the power supply. See Figure 4.
    Figure 4: DC Power Supply Input Mode Switch
    DC Power Supply
Input Mode Switch
  5. Using both hands, slide the power supply straight into the chassis until the power supply is fully seated in the chassis slot. The power supply faceplate should be flush with any adjacent power supply faceplate (see Figure 5).
    Figure 5: Installing a DC Power Supply
    Installing
a DC Power Supply
  6. Tighten the captive screws on the lower edge of the power supply faceplate.
  7. Remove the clear plastic cover protecting the terminal studs on the faceplate.
  8. Remove the nuts and washers from the terminal studs.
  9. Secure each power cable lug to the terminal studs, first with the washer, then with the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut. (see Figure 6).
    1. Attach the positive (+) DC source power cable lug to the RTN (return) terminal.
    2. Attach the negative (–) DC source power cable lug to the –48V (input) terminal.
    Figure 6: Connecting DC Power
    Connecting DC Power
    Caution

    You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply.

    Note

    The DC power supplies must be powered by dedicated power feeds.

  10. Replace the clear plastic cover over the terminal studs on the faceplate.
  11. Route the power cables along the cable restraint toward the left or right corner of the chassis. If needed to hold the power cables in place, thread plastic cable ties, which you must provide, through the openings on the cable restraint.
  12. Verify that the power cabling is correct, that the cables are not touching or blocking access to services gateway components, and that they do not drape where people could trip on them.
  13. Verify that the INPUT OK LED on the power supply is lit green.
  14. Switch the circuit breaker on the power supply to the ON position and observe the status LEDs on the power supply faceplate. If the power supply is correctly installed and functioning normally, the PWR OK, BRKR ON, and INPUT OK LEDs will glow green steadily.Note

    If more than one power supply is being installed, turn on all power supplies at the same time.

    Note

    The SCB must be present for the PWR OK LED to go on.

Replacing an SRX5400 Services Gateway DC Power Supply Cable

To replace an SRX5400 Services Gateway DC power supply cable, perform the following procedures:

  1. Disconnecting an SRX5400 Services Gateway DC Power Supply Cable

  2. Connecting an SRX5400 Services Gateway DC Power Supply Cable

Disconnecting an SRX5400 Services Gateway DC Power Supply Cable

To remove a power cable from a DC power supply:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to an approved site ESD grounding point.
  2. Switch off the external circuit breakers for all the cables attached to the power supply. 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. Remove the power cable from the DC power source.
  4. Detach the ESD grounding strap from the site ESD grounding point, and connect the strap to one of the ESD points on the chassis.
  5. Switch the circuit breaker on the power supply faceplate to the OFF position O.
  6. Remove the clear plastic cover protecting the terminal studs on the faceplate.
  7. Remove the nut and washer from the terminal studs. (Use a 7/16–in. nut driver or pliers.)
  8. Remove the cable lug from the terminal studs.
  9. Loosen the captive screws on the power supply faceplate.
  10. Carefully move the power cable out of the way.

Connecting an SRX5400 Services Gateway DC Power Supply Cable

To install a replacement power cable for a DC power supply (see Figure 7):

  1. Locate a replacement power cable that meets the specifications defined in DC Power Cable Specifications for the SRX5400 Services Gateway.
  2. Verify that a licensed electrician has attached a cable lug to the replacement power cable.
  3. Verify that the INPUT OK LED is off.
  4. Secure the power cable lug to the terminal studs, first with the flat washer, then with the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut, (see Figure 7).
  5. Route the power cable along the cable restraint toward the left or right corner of the chassis. If needed, thread plastic cable ties, which you must provide, through the openings on the cable restraint to hold the power cables in place.
  6. Make sure the cable is not touching or in the way of any device components, and that it does not drape where people could trip on it.
  7. Replace the clear plastic cover over the terminal studs on the faceplate.
  8. Attach the power cable to the DC power source.
  9. Verify that the INPUT OK LED on the power supply is lit green.
  10. Switch the circuit breaker on the power supply to the ON position (|)Note

    If more than one power supply is being installed, turn on all power supplies at the same time.

  11. Verify that the DC source power cabling is correct. Observe the status of the LEDs on the power supply faceplate. If the power cable is correctly installed and the power supply is functioning normally, the PWR OK, BRKR ON, and INPUT OK LEDs light green steadily.
Figure 7: Connecting Power Cables to the DC Power Supply
Connecting
Power Cables to the DC Power Supply