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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Automatic Transfer Switch (ATS) ATS Installation The ATS is installed between protected loads, the MicroTurbine, and the utility grid or local transformer. When the ATS is activated, the power supply is automatically transferred between the electric utility grid and the MicroTurbine. Installation of the ATS requires the following steps: 1. A shutdown of the MicroTurbine, followed by a 2. Installation of all electrical connections, 3. A reconfiguration of the interlocks and software and, 4. A restart of the MicroTurbine Electrical interconnection must be planned with care, particularly the neutral and ground connections. Safety requirements, code requirements and functional requirements must be observed. Phase rotation connections must be consistent with the utility grid to avert possible MicroTurbine and load damage. Therefore, the output from the ATS must be connected to the utility grid in an L1-L2-L3 counter-clockwise configuration. For resistance-grounded neutral supply, the protected loads must be compatible, and able to withstand phase-to-phase voltage between any phase and ground, and phase-neutral voltage between neutral to ground. The neutral-to-ground bar MUST BE removed from the MicroTurbine User Connection Bay for all MicroTurbines in a single unit or Multipac configuration. A single neutral-to-ground connection MUST BE made at the load or local utility. The figure below shows MicroTurbine to ATS interconnections. Single Unit or MultiPac Connections MicroTurbine Disconnect Switch Automatic Transfer Switch (ATS) Branch Circuit Disconnect Switch Wye utility or local transformer with solid or resistance grounded neutral L1 L2 L3 L1 L2 L3 N G Protected Loads 480040 Rev A (April 2008) Solid Connection or Resistor with R=100 Ohms or Less Ground Page 5 of 10 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Automatic Transfer Switch (ATS) Technical Information
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