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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Automatic Transfer Switch (ATS) In addition, perform the following ATS to MicroTurbine connections: ATS Connection Model C30 (UCB) Model C60/C65 (JUCB) TB1-1 TB2–Pin8 J10–Pin7 TB1-2 TB2–Pin7 J10–Pin3 Auto Load Auto Load should be enabled for optimum performance in both cases – using the MicroTurbine in either primary or backup modes. Configure Auto Load as follows: If using the control panel, configure the MicroTurbine for Auto Load as directed in the MicroTurbine User’s Manual 400001 for C30 and C60 models, or User’s Manual 400017 for the C65 model. If using CRMS, configure the MicroTurbine for Auto Load as directed in the CRMS User Edition Technical Reference 410013. Auto Restart In normal MicroTurbine day-to-day operations, Capstone recommends enabling Auto Restart to prevent the inconvenience of having to manually start the MicroTurbine after a fault. If Auto Restart is enabled and a MicroTurbine fault condition occurs, a restart counter increments for each failed restart attempt occurring within the first two minutes of the Load state. If five faults are registered, the MicroTurbine disallows further attempts to restart automatically, but may be manually restarted using the Start button. Potential for an endless loop arises if the MicroTurbine (as the primary source) faults when running under load after the restart counter has been reset to zero. In this scenario, the ATS will transfer the load to the backup source. The MicroTurbine restarts. When a normal MicroTurbine Load state waveform is detected by the ATS, the load is transferred from the backup source back to the MicroTurbine, which again faults. The loop is created by the ATS retransfer time exceeding the MicroTurbine two-minute auto restart time. Therefore, the MicroTurbine restart counter is not allowed to increment to five faults, where it would remain in a fault state. As a recommended solution, Capstone suggests re-programming the ATS retransfer time to be less than the MicroTurbine auto restart time to allow the MicroTurbine to run under load before its restart counter is reset. Since the MicroTurbine's restart counter resets after approximately two minutes of running in the Load state, an ATS retransfer setting of 1.5 minutes should ensure the counter has time to increment should a fault occur. Illustrative examples on the following page show how the restart counter reacts to faults occurring before and after the two minute reset window. Summarizing the available recommended solutions, the user may perform one of two options: 1) Set the ATS time between 1.0 and 1.5 minutes, or 2) Disable Auto Restart on the MicroTurbine. 480040 Rev A (April 2008) Page 8 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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