Connecting the SRX240 Services Gateway to a DC Power Source

Warning: DC-powered SRX240 Services Gateways are intended for installation only in a restricted access location.

Warning: Before performing the following procedure, 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.

Required tools and parts:

Before you begin:

Caution: Before you connect power to the services gateway, a licensed electrician must attach a cable lug to the grounding and power cables that you use. A cable with an incorrectly attached lug can damage the services gateway (for example, by causing a short circuit).

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the SRX240 Services Gateway to ground before you connect it to power.

You connect DC source power to the services gateway by attaching power cables from the external DC power sources to the terminal studs on the DC power feed faceplates.

To connect the DC source power to the services gateway:

  1. Ensure that the input circuit breaker is open so that the voltage across the DC power source cable leads is 0 V and that the cable leads will not become active while you are connecting DC power.

    Note: The DC power feed in an SRX240 Services Gateway with DC power supply model has four terminals labeled A+, B+, A–, and B– for connecting DC power source cables labeled positive (+) and negative (–). The DC power feed section on the SRX240 Services Gateway with DC power supply model is shipped with links (jumpers) from the A+ input to B+ input tied together and links from the A– input to B– input tied together.

  2. Remove the screw securing the terminal block cover using the Phillips (+) screwdriver, number 1 and remove the terminal block cover as shown in Figure 12. Save the screw.

    Figure 12: DC Power Feed on SRX240 Services Gateway with DC Power Supply Model

    DC Power Feed on SRX240
Services Gateway with DC Power Supply Model
  3. Remove the screws on the terminals using the Phillips (+) screwdriver, number 1. Save the screws.

    Warning: Ensure that the power cables do not block access to the services gateway or drape where people can trip on them.

  4. Connect the power feed to the power sources as shown in Figure 13. Secure power source cables to the power feed on the services gateway by screwing the ring lugs attached to the cables to the appropriate terminals by using the screw from the terminals.

    Figure 13: Connecting DC Power to the SRX240 Services Gateway with DC Power Supply Model

    Connecting DC Power
to the SRX240 Services Gateway with DC Power Supply Model

    To connect to a single power source:

    1. Leave the links (jumpers) on the terminal blocks in place.
    2. Secure the ring lug of the Return (+) DC power source cable to the A+ terminal on the terminal block.
    3. Secure the ring lug of the –48 VDC power source cable to the A– terminal on the terminal block.
    4. Tighten the screws on the power supply terminals until snug using the Phillips (+) screwdriver, number 2. Do not overtighten—apply between 8 lb-in. (0.9 Nm) and 9 lb-in. (1.02 Nm) of torque to the screws.

    To connect to two power sources:

    1. Remove the links (jumpers) and insulator on the power supply terminal block.
    2. Secure the ring lug of the Return (+) DC power source cable from the first DC power source to the A+ terminal.
    3. Secure the ring lug of the –48V DC power source cable from the first DC power source to the A– terminal.
    4. Secure the ring lug of the Return (+) DC power source cable from the second DC power source to the B+ terminal.
    5. Secure the ring lug of the negative –48VDC power source cable from the second DC power source to the B– terminal.
    6. Tighten the screws on the power supply terminals using the Phillips (+) screwdriver, number 1. Do not overtighten—apply between 8 lb-in. (0.9 Nm) and 9 lb-in. (1.02 Nm) of torque to the screws.
  5. Replace the terminal block cover and secure it using the screw. Use the Phillips (+) screwdriver, number 1 to tighten the screw.
  6. Close the input circuit breaker.
  7. Verify that the power cables do not block access to router components or drape where people can trip on them. Use the cable tie holder as shown in Figure 14 to secure cables so that they are not supporting their own weight as they hang to the floor.

    Figure 14: Organizing the Power Cables Using a Cable Tie Holder

    Organizing the Power Cables
Using a Cable Tie Holder
  8. Verify that the LEDs on the power supply are lit green and are on steadily.

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