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Maintaining the SRX550 HM Power System

Maintaining the SRX550 High Memory Services Gateway Power Supply

To maintain the power supplies of the services gateway:

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

  • Routinely check the POWER LED on the front panel. If this LED is solid green, the power supplies are functioning normally.

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

Replacing the AC Power Supply on the SRX550 High Memory Services Gateway

You can replace the AC power supply on the SRX550 High Memory Services Gateway after disconnecting the AC power cord and removing the power supply already installed. However, redundant AC power supplies are hot-swappable. You need not power off the services gateway for replacing them.

Note:

To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each power supply slot must contain either a power supply or a blank panel. If you remove a power supply, you must install a replacement power supply or a blank panel shortly after the removal.

This topic describes:

Disconnecting an AC Power Cord from the SRX550 High Memory Services Gateway

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. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Prevention of Electrostatic Discharge Damage.
  3. Unplug the power cord from the appliance inlet on the power supply.

Removing an AC Power Supply from the SRX550 High Memory Services Gateway

Up to two power supplies can be located at the rear of the chassis on the right side. Each AC power supply weighs 2 lb (1.32 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:

  1. Switch off the dedicated facility circuit breaker for the power supply, and remove the power cord from the AC power source. Follow the electrostatic discharge (ESD) and disconnection instructions for your site.
  2. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Prevention of Electrostatic Discharge Damage.
  3. Press the latch to the left of the power outlet (see Figure 1).
  4. After the power supply is unlatched, remove the power cord from the power supply.
  5. Pull the power supply straight out of the chassis.
Figure 1: Removing an AC Power Supply from the SRX550 High Memory Services Gateway Removing an AC Power Supply from the SRX550 High Memory Services Gateway

Installing an AC Power Supply on the SRX550 High Memory Services Gateway

To install an AC power supply:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Prevention of Electrostatic Discharge Damage.
  2. 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.
  3. Attach the power cord to the power supply.
  4. Route the power cord along the cable restraint toward the left or right corner of the chassis. If they are needed to hold the power cord in place, thread plastic cable ties, which you must provide, through the openings on the cable restraint.
  5. 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. If the power supply is correctly installed and functioning normally, the POWER LED lights steadily.
Figure 2: Installing an AC Power Supply on the SRX550 High Memory Services Gateway Installing an AC Power Supply on the SRX550 High Memory Services Gateway
Note:

If both power supplies are plugged in and receiving power, the RPS LED glows solid green.

Connecting an AC Power Cord to the SRX550 High Memory Services Gateway

To connect the AC power cord:

  1. Locate a replacement power cord with the type of plug appropriate for your geographical location.
  2. Connect the power cord to the power supply, as shown in Figure 3.
    Figure 3: Connecting an AC Power Cord on the SRX550 High Memory Services Gateway Connecting an AC Power Cord on the SRX550 High Memory Services Gateway
  3. Insert the power cord plug into an external AC power source receptacle.
  4. Route the power cord along the cable restraint toward the left or right corner of the chassis. If they are needed to hold the power cord in place, thread plastic cable ties, which you must provide, through the openings on the cable restraint.
  5. 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. If the power supply is correctly installed and functioning normally, the POWER LED lights steadily.

Replacing a DC Power Supply on the SRX550 High Memory Services Gateway

You can replace the DC power supply on the SRX550 High Memory Services Gateway after disconnecting the power cord and removing the power supply already installed. However, redundant DC power supplies are hot-swappable. You need not power off the services gateway for replacing them.

Note:

To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each power supply slot must contain either a power supply or a blank panel. If you remove a power supply, you must install a replacement power supply or a blank panel shortly after the removal.

This topic describes:

Removing a DC Power Supply Cable from the SRX550 High Memory Services Gateway

To remove a power supply cable connected to 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. For more information about ESD, see Prevention of Electrostatic Discharge Damage.
  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. Make sure the cable is not touching or in the way of any services gateway components and that it does not drape where people could trip on it.
  5. Remove the clear plastic cover protecting the terminal studs on the faceplate.

Removing a DC Power Supply from the SRX550 High Memory Services Gateway

Up to two power supplies can be installed at the rear of the chassis on the right side. Each DC power supply weighs approximately 2 lb (1.29 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 4.

  1. Switch off the dedicated facility circuit breaker for the power supply. Follow the electrostatic discharge (ESD) and disconnection instructions for your site.
  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. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Prevention of Electrostatic Discharge Damage.
  4. Remove the clear plastic cover protecting the terminal studs on the faceplate.
  5. Remove the screws and washers from the terminals. Use a Phillips (+) screwdriver, number 2 to loosen and remove the screws.
  6. Remove the cable lugs from the terminal studs.
  7. Carefully move the power cables out of the way.
  8. Push the tab on the left edge of the power supply to the right.
  9. Pull the power supply straight out of the chassis.
Figure 4: Removing a DC Power Supply from the SRX550 High Memory Services Gateway Removing a DC Power Supply from the SRX550 High Memory Services Gateway

Installing a DC Power Supply on the SRX550 High Memory Services Gateway

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. 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 off position (O), and tape the switch handle of the circuit breaker in the off position.
  2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Prevention of Electrostatic Discharge Damage.
  3. Orient the power supply so that the locking lever is on the left.
    Figure 5: Installing a DC Power Supply on an SRX550 High Memory Services Gateway Installing a DC Power Supply on an SRX550 High Memory Services Gateway
  4. 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.
  5. Tighten the captive screws on the lower edge of the power supply faceplate.
  6. Remove the clear plastic cover protecting the terminal studs on the faceplate.
  7. Verify that the DC power cables are correctly labeled before making connections to the power supply. In a typical power distribution scheme where the return is connected to chassis ground at the battery plant, you can use a multimeter to verify the resistance of the –48V and RTN DC cables to chassis ground:
    • The cable with very large resistance (indicating an open circuit) to chassis ground will be –48V.

    • The cable with very low resistance (indicating a closed circuit) to chassis ground will be RTN.

    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 terminals on the power supply.

  8. Connect DC power cables to the A+ and A- terminals, as shown in Figure 6:
    1. Remove the screws and square washers from the A+ and A- terminals. Use a Phillips (+) screwdriver, number 2. The square washers are permanently attached to the screws.
    2. Secure each power cable lug to the appropriate terminal with a screw. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each screw.
      • Secure the positive (+) DC source power cable lug to the A+ (return) terminal.

      • Secure the negative (–) DC source power cable lug to the A- (input) terminal.

    Figure 6: Connecting DC Power Cables Connecting DC Power Cables
  9. Replace the clear plastic cover over the terminal studs on the faceplate.
  10. Verify that the power cables are connected correctly, that they are not touching or blocking access to services gateway components, and that they do not drape where people could trip on them.
  11. Remove the tape from the switch handle of the circuit breaker on the panel board that services the DC circuit and switch the circuit breaker to the on position (  |  ). Observe the status LEDs on the power supply faceplate. If the power supply is correctly installed and functioning normally, the POWER LED lights green steadily on the services gateway front panel.
Note:

If more than one power supply is installed, turn on all power supplies at the same time. If both power supplies are plugged in and receiving power, the RPS LED glows solid green.