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Replacing Power System Components

Redundant power supplies (AC or DC) are hot-insertable and hot-removable.

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.

To replace a power system component, use the following procedures:

Removing an AC Power Supply

The power supplies are located at the rear of the chassis. Each AC power supply weighs approximately 5.0 lb (2.3 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 65):

  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. 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 Preventing Electrostatic Discharge Damage.
  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 65: Removing an AC Power Supply

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Installing an AC Power Supply

To install an AC power supply (see Figure 66):

  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 Preventing Electrostatic Discharge Damage.
  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 82).
  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 towards 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 66: Installing an AC Power Supply

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Removing a DC Power Supply

The power supplies are located at the rear of the chassis. Each DC power supply weighs approximately 3.8 lb (1.7 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 67):

  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. 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 Preventing Electrostatic Discharge Damage.
  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 67: Removing a DC Power Supply

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Installing a DC Power Supply

To install a DC power supply (see Figure 68):

  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. 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 Preventing Electrostatic Discharge Damage.
  3. Switch the circuit breaker on the power supply faceplate to the OFF position O.
  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 (see Figure 82).
  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. Remove the nuts and washers from the terminal studs.
  8. 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 69).
    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.

    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: For the SRX 5600 services gateway, the DC power supplies in PEM0 and PEM1 and PEM1 must be powered by dedicated power feeds derived from feed A, and the DC power supplies in PEM2 and PEM3 and PEM3 must be powered by dedicated power feeds derived from feed B. This configuration provides the commonly deployed A/B feed redundancy for the system.

    Note: For information about connecting to DC power sources, see DC Power Specifications and Requirements.

  9. Replace the clear plastic cover over the terminal studs on the faceplate.
  10. Route the power cables along the cable restraint towards 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.
  11. 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.
  12. Verify that the INPUT OK LED on the power supply is lit green.
  13. 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 light green steadily.

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

Note: An SCB must be present for the PWR OK LED to go on.

Figure 68: Installing a DC Power Supply

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Figure 69: Connecting DC Power

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Replacing an AC Power Cord

To replace an AC power cord:

Disconnecting an AC Power 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. 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 Preventing Electrostatic Discharge Damage.
  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 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 (see AC Power Cord Specifications).
  2. Insert the power cord plug into an external AC power source receptacle.
  3. Connect the power cord to the power supply.
  4. Route the power cord along the cable restraint towards 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.
  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.
  6. 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 a DC Power Supply Cable

To replace a power cable on a DC power supply, follow these procedures:

Removing a DC Power 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. For more information about ESD, see Preventing 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. 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 Preventing Electrostatic Discharge Damage.
  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 3/8–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.

Installing a DC Power Cable

To install a replacement power cable for a DC power supply (see Figure 70):

  1. Locate a replacement power cable that meets the specifications defined in Table 34.
  2. Verify that a licensed electrician has attached a cable lug to the replacement power cable.
  3. 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 70).
  4. Route the power cable along the cable restraint towards 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.
  5. 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.
  6. Replace the clear plastic cover over the terminal studs on the faceplate.
  7. Attach the power cable to the DC power source.
  8. Verify that the INPUT OK LED on the power supply is lit green.
  9. 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.

  10. 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 70: Connecting Power Cables to the DC Power Supply

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