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Connecting the SRX550 HM to Power

Connecting the SRX550 HM Grounding Cable

You ground the services gateway by connecting a grounding cable to earth ground and then attaching it to the chassis grounding points located on the right side of the device (if you are facing the front of the chassis).

You must install the SRX550 High Memory Services Gateway in a restricted-access location and ensure that the chassis is always properly grounded. The SRX550 High Memory Services Gateway has a two-hole protective grounding terminal provided on the chassis. 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.

Ensure that you have the following parts and tools available:

  • Phillips (+) screwdrivers, numbers 1 and 2

  • Two M5 grounding screws

  • Grounding cable

  • Cable lug (for example, Panduit LCC6-10A-L)

CAUTION:

Before services gateway installation begins, 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 ground the services gateway:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis. For more details, see Prevention of Electrostatic Discharge Damage.
  2. Ensure that all grounding surfaces are clean, free from accumulated dust or debris, and brought to a bright finish before grounding connections are made.
    Note:

    The surface of the grounding points are suitably plated for conductivity.

  3. Connect the grounding cable to a proper earth ground.
  4. Place the grounding cable lug over the grounding point (sized for M5 screws) on the left side of the back panel.
  5. Secure the grounding cable lug to the grounding point, first with the washers, then with the screws.
  6. 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.

See Also

Connecting the SRX550 High Memory Services Gateway to the AC Power Source

CAUTION:

Do not mix AC and DC power supplies within the same services gateway because this can damage the device.

A 645 W AC power supply with PoE support ships with the SRX550 High Memory Services Gateway. You connect AC power to the services gateway by attaching the power cord from the AC power source to the AC appliance inlet located on the power supply. The power cord is not provided.

To connect the services gateway to an AC power supply:

CAUTION:

You need an electrostatic discharge (ESD) grounding wrist strap while connecting the services gateway to an AC power supply.

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the side of the chassis.
  2. Locate the power cord or cords you will use to connect the services gateway to AC power.
  3. Insert the appliance coupler end of the power cord into the appliance inlet on the power supply.
  4. Insert the power cord plug into an external AC power source receptacle.
    Note:

    Each power supply must be connected to a dedicated AC power feed and a dedicated external circuit breaker. We recommend that you use a 15 A (250 VAC) minimum, or as permitted by local code.

    Figure 1: Connecting an AC Power CordConnecting an AC Power Cord
  5. 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.
Note:

The services gateway must be connected to earth ground during normal operation. The protective earthing terminal on the side of the chassis is provided to connect the services gateway to ground.

CAUTION:

We recommend using a surge protector for the power connection.

Connecting the SRX550 High Memory Services Gateway to a DC Power Source

CAUTION:

Do not mix AC and DC power supplies within the same services gateway. Damage to the device might occur.

A 645 W DC power supply with PoE support is available for the SRX550 Services Gateway.

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 (O), and tape the switch handle of the circuit breaker in the off position.

You connect DC power to the device by attaching power cables from the external DC power sources to the terminals on the power supply faceplate. You must provide the power cables.

The power supply has two sets of terminals, to accommodate a redundant DC power feed. If one feed fails, the services gateway draws its power from the other feed. The terminals for Feed A are labeled A+ and A- . The terminals for Feed B are labeled B+ and B-. You do not need to use both feeds; if you only have one DC power source, or if you do not want to use feed redundancy, you can connect just one feed.

To connect the DC source power cables to the services gateway power supply:

  1. Switch off the dedicated facility circuit breakers. 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 the ESD point on the back panel of the chassis.
  3. 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 2 shows how to install heat-shrink tubing.

      Figure 2: How to Install Heat-Shrink Tubing How to Install Heat-Shrink Tubing
  4. Remove the clear plastic cover protecting the terminals on the power supply faceplate.
  5. 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 large resistance (indicating an open circuit) to chassis ground will be –48V.

    • The cable with very low resistance (indicating a closed circuit) to chassis ground will be RTN.

    Note:

    The DC cable should be of minimum 14 AWG.
    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 terminals on the power supply.

  6. Connect DC power cables to the A+ and A- terminals:
    1. Remove the screws and square washers from the A+ and A- terminals. Use a Phillips (+) screwdriver, number 2. The square washers are permanently attached to the screws.
    2. Secure each power cable lug to the appropriate terminal with a screw. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each screw.

      • Secure the positive (+) DC source power cable lug to the A+ (return) terminal.

      • Secure the negative (–) DC source power cable lug to the A- (input) terminal.

    Figure 3: Connecting DC Power Cables Connecting DC Power Cables
  7. (Optional) If you have two DC power sources and wish to deploy A/B feed redundancy for the services gateway, connect the DC power cables to B+ and B- terminals also.
  8. Replace the clear plastic cover over the terminal studs on the faceplate.
  9. Verify that the power cables are connected correctly, that they are not touching or blocking access to services gateway components, and that they do not drape where people could trip on them.
Note:

The services gateway must be connected to earth ground during normal operation. The protective earthing terminal on the back panel of the chassis is provided to connect the services gateway to ground.

Powering On the SRX550 High Memory Services Gateway

To power on the services gateway:

  1. Ensure that you have connected the power supply to the device.
  2. Insert the plug of the power supply adapter into an AC or DC power source receptacle.

    1. Using AC Power supply—Insert the appliance coupler end of the power cord into the appliance inlet on the power supply and the power cord plug into an external AC power source receptacle.

    2. Using DC power supply—Connect DC power cables to the A+ and A- terminals and the other ends to an external DC power source. If you have two DC power sources and wish to deploy A/B feed redundancy for the services gateway, also connect DC power cables to the B+ and B- terminals and the other ends to an external DC power source.

      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 terminals on the power supply.

  3. Turn on the power to the AC or DC power receptacle.

The device starts automatically as the power supply completes its startup sequence. The POWER LED (on the front panel of the chassis) lights during startup and remains on steadily when the services gateway is operating normally.

Powering Off the SRX550 High Memory Services Gateway

To power off the services gateway, press the Power button on the front of the services gateway and hold it for 10 seconds. The services gateway immediately shuts down.

Note:

Graceful shutdown is not supported on the SRX550 High Memory Services Gateway.

To remove power completely from the services gateway, unplug the AC power cord or DC power supply cable.

After powering off a power supply, wait at least 60 seconds before turning it back on. After powering on a power supply, wait at least 10 seconds before turning it off.

When the system is completely powered off and you turn on the power supply, the services gateway starts as the power supply completes its startup sequence. If the services gateway finishes starting and you need to power off the system again, first issue the request system halt CLI command.

After a power supply is turned on, it can take up to 60 seconds for status indicators—such as the POWER LED (on the front panel of the chassis) and the show chassis command display—to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds.

Note:

When you power off a SRX550 High Memory Services Gateway with a LTE Mini-PIM installed, the LEDs on the LTE Mini-PIM may still be lit. This is because the Power button does not shut off power to the power supplies or the midplane on a SRX550 High Memory Services Gateway. You must remove the power cables or power cords to completely shut down the services gateway.