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    Connecting Power to a DC-Powered C3000 or C5000 Controller

    On a DC-powered controller, the DC power cables from the external DC power sources connect to the field-wiring terminals on each power supply.

    Connect DC power to the controller by inserting power cables into the field-wiring terminals on the faceplate of each power supply. DC power cables and lugs are not supplied with the device. For more information about the required cable type, see DC Power Cable Specifications for C Series Controllers.

    Caution: 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 DC power cables that attach to the terminal studs on the power supply faceplate. You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity.

    To connect DC power to a C3000 or C5000 Controller (see Figure 1):

    1. Verify that there is no power flowing from either external power source, so that the voltage across the leads of the DC power cables is 0 V. Ensure that there is no chance that the cable leads might become active during the procedure.
    2. Remove the clear plastic shield covering the field-wiring terminals on the power supply.
    3. Remove the screws on the field-wiring and ground terminal.
    4. Verify that a licensed electrician has attached a listed DC power cable lug to each power source cable and ground cable.

      Note: You must bend the cable lug that attaches to the DC power source cable at a 90° angle in order to properly install the clear plastic shield covering.

    5. Insert the DC power and ground cable lugs into the appropriate terminals. Using a number 1 Phillips screwdriver, turn the screw on each terminal clockwise to secure the cable. Apply 8.68 lb-in. (.98 Nm) of torque to each screw.
      1. Insert the positive (+) source cable into the return terminal, which is labeled RTN.
      2. Insert the negative (–) source cable into the input terminal, which is labeled –48V.
      3. Align the ground cable with the ground terminal.

      Caution: Ensure that each cable lug seats flush against the surface of the terminal block as you tighten the screws.

    6. Verify that the DC source power and grounding cables are correct, that they are not touching or blocking access to controller components, and that they do not drape where people could trip on them.
    7. Replace the clear plastic shield over the field-wiring terminals.
    8. Turn on the current from the power source so that voltage flows to the controller.

    Figure 1: Connecting DC Power Cables to the Controller

    Connecting DC Power
Cables to the Controller

    Published: 2014-06-12