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Connecting the SRX4600 to Power

Connecting Earth Ground to an SRX4600 Services Gateway

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the SRX4600 Services Gateway to earth ground before you connect it to power.

For installations that require a separate grounding conductor to the chassis, you must attach a protective earthing terminal bracket on the mounting bracket on the left front of the services gateway to connect to the earth ground ).

You must install the SRX4600 in a restricted-access location and ensure that the chassis is always properly grounded. The SRX4600 has a two-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 two-hole grounding lug connection. This tested system meets or exceeds all applicable EMC regulatory requirements with the two-hole protective grounding terminal.

Before you connect earth ground to the protective earthing terminal of an SRX4600 Services Gateway, ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable.

CAUTION:

Using a grounding cable with an incorrectly attached lug can damage the services gateway.
Note:

Mount your services gateway in the rack or cabinet before attaching the grounding lug to the services gateway. See SRX4600 Services Gateway Installation Overview.

Ensure that you have the following parts and tools available:

  • Protective earthing terminal bracket—This bracket attaches to the services gateway chassis through the left front mounting bracket, providing a protective earthing terminal for the services gateway.

  • Grounding cable for your services gateway—The grounding cable must be 14 AWG (2 mm²), minimum 90° C wire, or as permitted by the local code.

  • Grounding lug for your grounding cable—The grounding lug required is a Panduit LCD10-10A-L or equivalent.

  • Two SAE 10–32 x 0.375 in. screws with integrated split washers (not provided)—The screws and washers are used to secure the grounding lug to the protective earthing terminal.

  • Socket wrench or screw driver to tighten the screws.

An AC-powered services gateway chassis gains additional grounding when you plug the power supply in the services gateway into a grounded AC power outlet by using an AC power cord appropriate for your geographical location. See SRX4600 Services Gateway AC Power Cord Specifications.

To connect earth ground to an SRX4600 Services Gateway:

  1. Connect one end of the grounding cable to an appropriate earth ground site, such as the mounting rack.
  2. Position the grounding lug over the protective earthing terminal on the side of the chassis, which is visible through the mounting bracket.
  3. Secure the grounding lug to the protective earthing terminal with the two washers and screws. See Figure 1.
    Figure 1: Connecting a Grounding Cable to an SRX4600 Services GatewayConnecting a Grounding Cable to an SRX4600 Services Gateway
  4. Dress the grounding cable and ensure that it does not touch or block access to other device components and that it does not drape where people could trip over it.

Connecting AC Power to an SRX4600 Services Gateway

Ensure that you have a power cord appropriate for your geographical location available to connect AC power to the services gateway.

Before you begin connecting AC power to the services gateway:

  • Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

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

    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 supply. 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 chassis to earth ground before you connect it to power. For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the services gateway chassis to connect to the earth ground. For instructions on connecting earth ground, see Connecting Earth Ground to an SRX4600 Services Gateway. The services gateway gains additional grounding when you plug the power supply in the services gateway into a grounded AC power outlet by using the AC power cord appropriate for your geographical location.

  • Install the power supply in the chassis. For instructions on installing an AC power supply in an SRX4600 Services Gateway, see Installing the SRX4600 Services Gateway AC Power Supply.

The SRX4600 Services Gateway is shipped from the factory with two power supplies. Each power supply is a field-replaceable unit (FRU). You can install replacement power supplies without powering off the services gateway or disrupting the services gateway function.

Note:

Each power supply must be connected to a dedicated power source outlet.

To connect AC power to an SRX4600 Services Gateway:

  1. Attach the grounding strap to your bare wrist and to a site ESD point.
  2. Ensure that the power supplies are fully inserted in the chassis and the latches are secure. If only one power supply is installed, ensure a that blank cover panel is installed over the second power supply slot.
  3. Locate the power cord or cords shipped with the services gateway; the cords have plugs appropriate for your geographical location. See SRX4600 Services Gateway AC Power Cord Specifications.
    Warning:

    Ensure that the power cord does not block access to device components or drape where people can trip on it.

  4. Insert the coupler end of the power cord into the power cord inlet that is on the faceplate of the AC power supply.
  5. Push the power cord retainer onto the power cord.
  6. Insert the power cord plug into an AC power source outlet.

    • If the AC power source outlet has a power switch, set it to on (|) position and the services gateway will power on.

    • If there is no power switch on the AC power source outlet, the services gateway will power on instantly.

  7. Verify that the LEDs on each power supply are lit green.

    If the amber fault LED is lit, remove power from the power supply, and replace the power supply (see Replacing an SRX4600 Services Gateway AC Power Supply). Do not remove the power supply until you have a replacement power supply ready: the power supplies or a blank cover panel must be installed in the services gateway to ensure proper airflow.

    CAUTION:

    Replace a failed power supply with a blank panel or new power supply within 1 minute of removal to prevent chassis overheating.

Connecting DC Power to an SRX4600 Services Gateway

Before you begin connecting DC power to the services gateway:

  • Ensure that you have taken the necessary precautions to prevent ESD damage (see Prevention of Electrostatic Discharge Damage).

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

    CAUTION:

    To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the services gateway to earth ground before you connect it to power. For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the services gateway chassis to connect to earth ground. For instructions on connecting an SRX4600 Services Gateway to ground using a separate grounding conductor, see Connecting Earth Ground to an SRX4600 Services Gateway.

  • Install the power supply in the chassis. See Installing the SRX4600 Services Gateway DC Power Supply.

Ensure that you have the following parts and tools available to connect DC power to the services gateway:

  • Electrostatic discharge (ESD) grounding strap

  • Multimeter

The SRX4600 Services Gateway is shipped from the factory with two power supplies. Each power supply is a field-replaceable unit (FRU). You can install replacement power supplies without powering off the services gateway or disrupting the services gateway function.

Warning:

Before you perform DC power procedures, ensure there is no power to 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.

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 supply. A cable with an incorrectly attached lug can damage the services gateway (for example, by causing a short circuit).

Note:

Each power supply input feed must be connected to a dedicated DC power source outlet.

Warning:

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

To connect DC power to the services gateway:

  1. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  2. Ensure that the power source circuit breaker is open so that the voltage across the DC power source cable leads is 0 V and that the cable leads do not become active while you are connecting DC power.
  3. 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 –48V (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 RTN (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 DC power input terminals on each power supply.
  4. Install heat-shrink tubing insulation around the power cables.

    To install heat-shrink tubing:

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

    Figure 2 shows the steps to install heat-shrink tubing.

    Note:

    Do not overheat the tubing.
    Figure 2: How to Install Heat-Shrink Tubing
  5. Remove the protective cover from the DC power input terminal block. Save this cover for future use.
    Note:

    It might be necessary to slide each power supply partially out of the chassis to easily connect the DC power source cables to the DC power input terminals. See Removing the SRX4600 Services Gateway DC Power Supply.
  6. Remove the M5 K-nuts from each DC power input terminal.
  7. Attach DC terminal rings (TE 2-36161-2 Terminal Ring, number 10 or equivalent, provided) to the ends of the DC power source cables (not provided). Crimp tightly.
  8. Insert the DC terminal rings into the DC power input terminals and secure the DC terminal rings with M5 K-nuts, (see Figure 3). Apply between 9 lb-in. (1.1 Nm) and 12 lb-in. (1.3 Nm) of torque to tighten each M5 K-nuts.
    Figure 3: Connecting the Power Supply Cables to a DC power Supply Connecting the Power Supply Cables to a DC power Supply
  9. Replace the protective cover over the input terminal block.
  10. Ensure that the power supply is fully inserted and latched securely in the chassis.
  11. Repeat Steps 5 through step 10 for any remaining power supply.
  12. 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.
  13. Verify that the OK/FAIL LED is lit green and on steadily.

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