Technical Documentation

Before You Install VXA1000 Series Media Flow Engines

Before installing a VXA Series Media Flow Engine:

  • Verify that the site meets all environment specifications. See Environmental Requirements and Specifications for VXA1000 Series Media Flow Engines.
  • Read and understand the clearance requirements for the appliance to ensure adequate ventilation and enable access to the appliance for maintenance. See Clearance Requirements for Airflow and Hardware Maintenance for VXA1000 Series Media Flow Engines.
  • Have the tools and accessories needed to complete the installation. See Unpacking and Inspecting VXA Series Media Flow Engines. In addition, you need a flat-bladed screwdriver to remove or replace a storage drive.
  • Verify that the cables you plan to use meet the specifications, and review the cabling recommendations. See AC Power Cord Specifications for VXA Series Media Flow Engines and RJ-45 Console Connector Pinout for VXA Series Media Flow Engines. Have plastic cable ties or other means to secure traffic and power cables safely out of the way.
  • Verify that the electrical supply meets all AC or DC power requirements. See Power Specifications for VXA1000 Series Media Flow Engines.

    When equipped with a DC power supply, the VXA1000 Series Media Flow Engine supports a DC Isolated return (DC-I) installation. In a DC-I installation, the DC power return conductor is isolated from the equipment chassis or frame when connected to the power supply.

  • Consider the following guidelines before installing the appliance:

    • For AC-power-equipped appliances you must provide an external Surge Protection Device (SPD).
    • The nominal working voltage range for a DC-power-equipped appliance is -48 VDC. This appliance can operate over an input voltage range from -38 VDC to -72 VDC.
    • For DC-power-equipped appliances, you must provide an external certified, dedicated circuit breaker rated at a minimum of 20 A for each DC power supply.
    • For DC-power-equipped appliances, you must supply four DC power cables that meet your local code requirements.
    • You must provide a good earth ground for the rack.
    • On DC-power-equipped models, you must supply a ground cable for the power supply.
    • We recommend using a ground cable identified according to local standards to ground the appliance.

      For example, a green wire is typical for ground conductors in the United States, Canada, and countries that follow similar wiring codes for 60 Hz power supplies. A green-and-yellow striped wire is typical for ground conductors in Europe and countries that follow a similar wiring code for 50 Hz power supplies.

    • You must use only copper grounding conductors.
    • For a ground wire attaching directly to the rack, we recommend using the following ground lug: Panduit P/N LCDX8-10A-L, #8 AWG, #10 stud, 0.625-inch spacing.
    • To ensure a reliable low-resistance ground bond, you must provide and use star washers and thread-forming screws with paint-piercing washers to secure the ground wire to the rack frame, and to secure the appliance chassis to the rack.

      If you connect the ground wire to a ground rail in the rack or to any other grounding facility provided by the site, you must use the appropriate fasteners to ensure a reliable ground bond. When the ground wire is attached with bolts or to studs, locking washers can help ensure the ground wire does not come loose.

    • Tighten all fasteners to the torque specification recommended by the manufacturer of the fastener or recommended by a recognized standards organization for that size fastener. Do not overtighten the fasteners.

      For example, the following values are typical torque specifications for rack screws:

      • 10-32—20 in-lb
      • 12-24—30 in-lb
      • M6—20 in-lb
    • You must coat bare conductors with an appropriate antioxidizing compound before making any crimp connections. You must bring all unplated connectors, braided strap, and bus bars to a bright finish and then coat them with an appropriate antioxidizing compound before you connect them.

Published: 2010-07-14

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