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CHAPTER 3 Capstone SYSTEM DESCRIPTION Acceleration The system controller waits in this state until the Generator Controller has transitioned the engine speed up to the minimum engine idle speed before transitioning to the next state. Run This is the state the system stays in until the engine is fully warmed up and the load command is set by the user. Once both of these conditions are met, the System Controller transitions to the Load state. Load In this state, power is generated out of the system. In Grid Connect, the system will meet the commanded demand of the user. In Stand Alone, the system will support the entire load connected to the microturbine up to the limit of the microturbine output. Recharge (Hot Standby) This state is only active for Stand Alone systems. In Stand Alone, it is critical to make sure the batteries are charged prior to shutting down. Therefore, the System Controller disables the main output power, but continues to produce power with the engine thus allowing the battery controllers to fully charge the main system batteries. The time for this charge will vary with the existing health of the batteries at the time of shutdown. Once the batteries are fully charged, the System Controller continues to the next state. The system is also available to transition back to Load state, such as when commanded to return to Grid Connect mode after a utility outage. This state is also referred to as Hot Standby. Cooldown In this state, the System Controller turns off the Engine Controller which turns off the fuel to the engine. Once the fuel is off, the System Controller monitors the engine temperature until it has dropped enough to stop the engine. It then transitions to the next state. Restart This state exists to allow the user to restart the microturbine without completely shutting down first. The System Controller commands the system back to the lightoff speed and then transitions back to the Open Loop Light state. Shutdown In this state, the System Controller commands the Generator Controller to run the engine back down to the Liftoff speed and then quickly to zero speed. Once the speed of the engine is confirmed to be at zero, the System Controller disables the Generator Controller, the Load Controller, and the Battery Controllers (if the system is in Stand Alone mode). 410066 Rev C (June 2009) 3-10 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 | CAPSTONE C200 MICROTURBINE TECHNICAL REFERENCE
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