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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: C30 and C60 Hybrid Electric Vehicle (HEV) Application Information for Capstone The MicroTurbine is then started and fuel added to the system. The Run state is the warm-up period. The warm-up period is a total of one minute, and includes the time to reach the idle temperature set point. When the load state is reached, the MicroTurbine begins outputting the demanded power level. When the battery management system provides a stop command (STRCMD = 0), the MicroTurbine will transition through cooldown and then shutdown, and then back to Standby. If the MicroTurbine becomes disconnected from the batteries, the system will not be able to sustain operation and will go through a warmdown state (high temp cooldown for the MicroTurbine components that may cause engine damage) and then to the fault state. A STRCMD without any values attached may be issued to determine if the engine is running. A response of STRCMD,0 = 1 reports that the system is still operating. If it is 0, then the MicroTurbine has shut down for some reason. A start command may be issued at any time, and the MicroTurbine will attempt a re-start if it is in an appropriate state (and there are no faults) to do so. The PWRDMD command may be issued at any time. The MicroTurbine only reacts to the commanded value when in the Load state. The STRCMD = 0 may be given at any time and the MicroTurbine will safely stop outputting power and move into cooldown. The power demand may be changed as often as required, but the MicroTurbine will rate itself to control the changes to reach the most recent demanded value. Giving a power demand from 0 to 60 kW (full on load), will take approximately two minutes, so the battery management system should use some scheme that keeps MicroTurbine response in mind. That is to say, command a start before the minimum state of charge is reached. The INVPWR RS-232 command may be used to view the MicroTurbine output power once reaching the Load state before changing the PWRDMD setting. The MicroTurbine is tested for full on and off loads, so any value changes in the power demand are allowed and a stop command can be given at any load. The SYSSTA command provides textual output of the current operational state of the MicroTurbine. This may be used to monitor when the MicroTurbine reaches the Load state or has entered a Fault / Shutdown state. The same data may be received in a hexadecimal format using the SYSCON command. There are two parts to the SYSCON command results: (1) the system state and (2) the mode. Only the state portion is relevant, as vehicle systems only operate in one mode. SYSCON returns a four-digit ASCII representation of a hex value with the last three representing the state. 480009-001 Rev B (October 2004) Page 43 of 54 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. CAUTION When the bus is normally shut off at the end of the day, the battery supply must not be disconnected until the MicroTurbine has gone through this cooldown/shutdown cycle and is back in Stand By.PDF Image | Application Guide Model C30 and C60 HEV Application Information
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