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CHAPTER 3 Capstone SYSTEM DESCRIPTION Operational States Figure 3-3 and Figure 3-4 show the C200s operational states and all possible transitions between states. The transitions and active states can be different 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 if the system ever faults out and ends up in the Disable state. Power Up The Start-Up sequence differs for Grid Connect and Stand Alone modes: For Grid Connect, the user needs to provide power from the Grid Connection to the main electrical terminal connections on the microturbine. Once 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 putting the system into the Power Up control state on the main controller. For Stand Alone, the user presses the Battery Wakeup button on the Display Panel or closes the external battery wakeup circuit momentarily. This circuit applies the 12 V power from the small battery in the user connection bay to the battery controllers, latching a contact that enables the precharge circuit in 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. The system then starts up the same way as the Grid Connect system. While in the Power Up state, the System Controller goes through all of its system checks, checks that all other controllers have also passed their system checks, and checks that it has the correct hardware connected for this type of system. It then checks the hardware inputs to determine if it is configured to be a Grid Connect, Stand Alone, or Dual Mode system. If there are errors during this process, then the system transitions to the Invalid state. If the jumpers and hardware are correct, the system transitions to the Stand By state. 410066 Rev C (June 2009) 3-6 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 C200 MICROTURBINE TECHNICAL REFERENCE
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