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Connecting the SRX4200 to Power

Connecting the SRX4200 Services Gateway Grounding Cable

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the services gateway must be adequately grounded before power is connected. You must provide a grounding lug to connect the services gateway to earth ground.

You ground the services gateway by connecting a grounding cable to earth ground and then attaching it to the chassis grounding point located on the back panel of the device using an M5 x 10 mm grounding screw.

You must install the SRX4200 in a restricted-access location and ensure that the chassis is always properly grounded. The SRX4200 has a single-hole protective grounding terminal provided on the chassis. See Figure 1. Under all circumstances, use this grounding connection to ground the chassis. For AC-powered systems, you must also use the grounding wire in the AC power cord along with the single-hole grounding lug connection. This tested system meets or exceeds all applicable EMC regulatory requirements with the single-hole protective grounding terminal.

CAUTION:

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

Ensure that you have the following parts and tools available:

  • Electrostatic discharge (ESD) grounding wrist strap

  • Phillips (+) screwdriver, number 2

  • 16 AWG single-strand wire grounding cable (green and yellow wire)

  • Grounding lug (ring-type, vinyl-insulated TV14-6R lug, or equivalent)

  • One metric M5 x 10 mm grounding screw

To connect the services gateway to earth ground:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  2. Connect one end of the grounding cable to a proper earth ground, such as the rack in which the services gateway is mounted.
  3. Place the grounding lug attached to the grounding cable over the grounding point.
  4. Secure the grounding cable lug to the grounding point with the screw. See Figure 1.
    Figure 1: Connecting the Grounding CableConnecting the Grounding Cable
  5. Dress the grounding cable and verify that it does not touch or block access to the services gateway components and that it does not drape where people could trip on it.
Note:

When removing the chassis, turn off the power, and disconnect the grounding cable.

Connecting AC Power to an SRX4200 Services Gateway

Ensure that you have a power cord appropriate for your geographical location available to connect AC power to an SRX4200 Services Gateway. Before you begin connecting AC power:

  • Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage.

  • Ensure that you have connected the device chassis to earth ground.

    CAUTION:

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

    To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must properly ground the services gateway chassis before connecting power.

To connect AC power:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the rear of the chassis.
  2. Ensure that the power supplies are fully inserted in the chassis and the latches are secure.
  3. Locate the power cords shipped with the services gateway; the cords have plugs appropriate for your geographical location.
  4. Insert the coupler end of the power cord into the AC power cord inlet on the AC power supply faceplate.
  5. Push the power cord retainer onto the power cord. See Figure 2.
    Figure 2: Connecting AC PowerConnecting AC Power
  6. If the AC power source outlet has a power switch, set it to the off (0) position.
  7. Insert the power cord plug into an AC power source outlet.
  8. Dress the power cord appropriately. 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.
  9. If the AC power source outlet has a power switch, set it to the on (|) position.
  10. Repeat steps 4 through 8 for the second AC power supply.
  11. Verify that the AC and DC LEDs on each power supply are lit green. If the fault status (!) LED is lit amber, remove power from the power supply, and replace the power supply (see Removing an AC Power Supply from an SRX4200 Services Gateway). Do not remove the power supply until you have a replacement power supply ready. The power supplies must be installed in the services gateway to ensure proper airflow.

Connecting DC Power to an SRX4200 Services Gateway

Before you begin connecting DC power to an SRX4200 Services Gateway:

  • Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage.

  • Ensure that you have connected the chassis to earth ground.

    CAUTION:

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

    To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must properly ground the services gateway chassis before connecting power.

Ensure that you have the following parts and tools available:

  • DC power source cables (14–16 AWG) with ring lug (Molex 190700069 or equivalent)

  • Phillips (+) screwdriver, number 2

  • Multimeter

To connect DC power:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the rear of the chassis.
  2. 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 high resistance (indicating an open circuit) to chassis ground is negative (–) and will be installed on the V– (input) DC power input terminal.

    • The cable with very low resistance (indicating a closed circuit) to chassis ground is positive (+) and will be installed on the V+ (return) DC power 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.
  3. 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.
  4. Install heat-shrink tubing insulation around the power cables:

    1. Slide the tubing over the portion of the cable where it is attached to the lug barrel. Ensure that the tubing covers the end of the wire and the barrel of the lug attached to it.

    2. Shrink the tubing with a heat gun. Ensure that you heat all sides of the tubing evenly so that it shrinks around the cable tightly.

      Note:

      Do not overheat the tubing.

      Figure 3 shows how to install heat-shrink tubing.

      Figure 3: How to Install Heat-Shrink Tubing How to Install Heat-Shrink Tubing
  5. Remove the terminal block cover. The terminal block cover is a piece of clear plastic that snaps into place over the terminal block.
  6. Remove the screws on the terminals using the screwdriver.
  7. Connect each power supply to the power source. Secure power source cables to the power supplies by screwing the ring lugs attached to the cables to the appropriate terminals by using the screw from the terminals.

    • Secure the ring lug of the positive (+) DC power source cable to the V+ terminal on the DC power supply.

    • Secure the ring lug of the negative (–) DC power source cable to the V– terminal on the DC power supply.

    Figure 4: Connecting DC Power Connecting DC Power
  8. Tighten the screws on the power supply terminals until snug using the screwdriver. Do not overtighten.
  9. Replace the terminal block cover.
  10. Close the input circuit breaker.
  11. The device powers on as soon as power is provided to the power supply.
  12. Verify that the IN and OUT LEDs on the power supply are lit green and are on steadily.

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