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CHAPTER 5 Capstone BATTERY MANAGEMENT CHAPTER 5: BATTERY MANAGEMENT Battery management consists of two elements; the controls management during the normal operational state and establishing equalization charges to maintain the life of the battery pack. The controls management is designed as an integrated element of the overall microturbine control system, and does not require any user input. It is described in the following section to help the user understand how the system functions. The equalization period does require user input, and the period is dependent on the environmental conditions and load profiles of the application. In Stand Alone operation, the primary functions of the battery are: Provide power during onload transients Accept power during offload transients Provide power while starting and stopping the microturbine Provide power during standby state. Battery battery Chapter 11: Maintenance for recommended preventive maintenance. performance is tied to regularly scheduled maintenance and equalization charging to optimize life and ensure that the battery performs as designed. Refer to the Battery Life section of Battery Charge Management Upon a Start command, the system leaves the Standby state to power up microturbine components to operational levels before transitioning to the Run state, where battery charging may again occur. Once started in Stand Alone mode, the microturbine will not advance to the Stand Alone Load state until the battery state-of-charge is at least 60% (note that state-of-charge less than 60% will only occur under conditions of poor maintenance, multiple subsequent fault cycles or end of battery life). After this state is achieved, the output contactor is closed and the microturbine begins producing power for connected loads. The C200 microturbine system is designed to keep the battery at 95 to100 percent state-of-charge during Load state operation to allow for sourcing power for load transients. If a user-initiated STOP is performed, the system immediately enters the recharge state, to ensure the battery is over 90 percent state-of-charge before entering the Cooldown state. Normally, the system will take approximately twenty (20) minutes to recharge the battery following a STOP command. On transition to cooldown, fuel is commanded off and the microturbine spins down, but remains rotating to provide airflow over engine components for cooling. After Cooldown is complete, the microturbine enters a short Shutdown state before finally entering the Standby state. No battery charging is performed while in Standby. If the system is not commanded ON during a user-selectable time period, the system will automatically enter a minimum battery drain state called Sleep state. This time period is called the Auto Sleep Time. Putting the battery in Sleep state can preserve battery charge for up to six months (life is based on ambient temperatures). Refer to the CRMS Technical Reference User Edition (410013) for how to set the Auto Sleep Time. Note that the batteries must be at least 90% state-of charge for the system to achieve the full Stand Alone step load capabilities defined in Chapter 8: Electrical Ratings. Perform an 410066 Rev C (June 2009) 5-1 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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