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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Automatic Transfer Switch (ATS) Operating Modes The ATS may be utilized with the MicroTurbine in one of two modes: o UsingtheMicroTurbineastheprimarysourcewiththeutilitygridasabackup o UsingtheutilitygridastheprimarysourcewiththeMicroTurbineasabackup MicroTurbine as the Primary Source (Utility as Backup) The MicroTurbine runs continuously when configured as the primary source, transferring control to the utility grid when an outage occurs. As power production resumes in accordance with ATS settings, the load is returned to the MicroTurbine, which then initiates an equalization charge automatically based on an internal 7-day clock. Utility as the Primary Source (MicroTurbine as Backup) When using the utility grid as the primary source and the MicroTurbine as backup, the ATS automatically provides ‘wakeup’ and ‘run’ signals as required to start the MicroTurbine in event of utility outage. Exerciser Functionality The ATS includes a programmable exerciser function, which wakes up the MicroTurbine(s) every seven days and ensures the batteries maintain charge. Battery charging is mandatory if the MicroTurbine will be idle for extended periods. However, this is not an issue if the MicroTurbine is operating as a primary source. ATS exercising may be performed with or without a load, using an ATS switch setting. The MicroTurbine must perform an equalization charge cycle periodically to maintain an equal charge in all battery cells. This equalization charge must be commanded manually (charges to 100 percent state-of-charge) and will take up to four hours. The MicroTurbine has a 7-day clock that will trigger the start of an equalization charge during an ATS exercise event. However, full equalization completion is not allowed due to the ATS signal being disabled in less than the 4-hour period. For this reason, equalization charging of batteries MUST be performed on a regular interval to ensure MicroTurbine operation. See Standard Maintenance Work Instructions (440000) for recommended battery maintenance intervals. Exercise Under Load If “exercise under load” is chosen, the ATS issues ‘wakeup’ and ‘start’ commands and transfers the load from the primary source to the MicroTurbine for 20 minutes. After 20 minutes, the load is returned to the primary source, and the MicroTurbine continues to run five additional minutes with no load. The run command is then terminated by the ATS while the MicroTurbine runs for an additional battery recharge and cooldown period (up to 20 minutes), as determined by the battery state-of-charge, before shutting down. Exercise Under No-Load If “exercise under no-load” is chosen, the sequence is similar with the exception that the load is not transferred to the MicroTurbine, and the five minute run segment is omitted prior to the MicroTurbine’s battery charge/cooldown segment. 480040 Rev A (April 2008) Page 4 of 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 | Automatic Transfer Switch (ATS) Technical Information
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