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CHAPTER 3 Capstone SYSTEM DESCRIPTION Operational States Figure 3-5 and Figure 3-6 show the power module operational states and all possible transitions between states. The transitions and active states can differ between Grid Connect and Stand Alone operation. The fault logic will transition directly out of any state into the Disable, Warmdown, or Fault state depending upon the severity of the fault. If the user initiates a download of new software, then the system transitions to the Software Download state and remains there until the system is restarted to ensure that the power is cycled after downloading new software. This cycle of power is also required a system fault places the system in the Disable state. Power Up The Start-Up sequence differs for Grid Connect and Stand Alone modes: For Grid Connect, the turbine draws power from the grid connection, which is transmitted to the main electrical terminal connections on the C1000 package. Once grid power is applied, the system’s DC bus precharge circuit powers up the main DC power bus that supplies power to the 24 VDC power supplies. These power supplies provide power throughout the system to all the individual digital controllers, placing the system in the Power Up control state. For Stand Alone or Dual Mode configurations, the user must first press the Battery Wakeup button located on the C1000 controller. This circuit supplies 24 V power from the C1000 controller back-up battery to the controller. The C1000 then initiates a power module Battery Wakeup by momentarily closing the power module external battery wakeup circuits. The external battery wake circuitry latches a contact that enables the precharge circuit on the battery controllers to activate the battery’s main controller. The battery’s main controller then energizes the system’s primary DC bus using power from the main batteries. While in the Power Up state, the System Controller goes through hardware and software system checks to verify that all power module subsystem controllers are operational. The power module system controller then determines if it is configured to be a Grid Connect, Stand Alone, or Dual Mode system. If there are errors during this process the system will transition to the Invalid state. If all Power Up checks pass, the system will transition to the Stand By state. 410072 Rev A (January 2009) Page 3-9 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 | CAPSTONE C1000 MICROTURBINE SYSTEMS TECHNICAL REFERENCE
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