Replacing a DC Power Supply on the SRX3400 Services Gateway

Note: For the services gateway to meet NEBS and ETSI standards, both DC power supplies must be enhanced DC power supplies. See SRX3400 Services Gateway NEBS and ETSI Compliance for more information.

Note: The same DC power supply is used in both the SRX3400 and SRX3600 Services Gateways. However, this power supply is not interchangeable with that used in the SRX1400 Services Gateway. The SRX1400 Services Gateway power supply will fit into the SRX3400 Services Gateway, but will not work properly. You can identify the SRX1400 Services Gateway power supply by the plastic air filter assembly installed over the cooling air inlet as shown in Figure 69.

Figure 69: Identifying Power Supply Types

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To replace a DC power supply:

  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 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 to the SRX3400 Services Gateway.
  4. Remove the clear plastic cover protecting the terminal studs on the faceplate.
  5. Remove the screws and washers from the terminals. Use a number-2 Phillips screwdriver to loosen and remove the screws.
  6. Remove the cable lugs from the terminals.
  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 70: Removing a DC Power Supply

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  10. Orient the replacement power supply so that the tab is on the left side, as shown in Figure 71.

    Figure 71: Inserting a DC Power Supply

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  11. Using both hands, slide the replacement power supply straight into the chassis until the power supply is fully seated in the chassis slot. Make sure the tab on the left edge of the power supply clicks into place. The power supply faceplate should be flush with any adjacent power supply faceplate.

    Note: Be sure to have the power supply oriented correctly. The tab must be on the left and click into place when fully seated. If the power supply does not insert easily or does not become flush with the chassis, you may have the power supply upside down.

  12. Remove the clear plastic cover protecting the terminal studs on the faceplate.
  13. Remove the screws and washers from the terminals.
  14. Secure each power cable lug to the terminal studs, first with the washer, then with the screw. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each screw.
    1. Secure each positive (+) DC source power cable lug to a RTN (return) terminal.
    2. Secure each negative (–) DC source power cable lug to a -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: The DC power supply in slot PEM0 must be powered by dedicated power feeds derived from feed A, and the DC power supply in slot PEM1 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 SRX3400 Services Gateway DC Power System Electrical Specifications.

  15. Replace the clear plastic cover over the terminal studs on the faceplate.
  16. 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. If the power supply is correctly installed and functioning normally, the LED on the power supply lights green steadily.

    Note: You must have an SFB and a Routing Engine installed in the services gateway for the power supply to turn on automatically.

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