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Capstone Turbine Corporation Model C65 Hybrid UPS User’s Manual 3.10. Transfer to/from Utility Power If the Hybrid UPS system is operating in UPS Mode or High Efficiency Mode, it will attempt to maintain synchronism of the load output to the utility input voltage in both frequency as well as phase relationship. Therefore, during normal operation it is possible to seamlessly transfer the critical load from the output of the Hybrid UPS systems to the utility source, or vice versa, using a closed transition scheme. Automatic Transfer Switches (ATS) are available with the ability to make a momentary closed transition when voltages and phase relationship of the two sources are within preset limits. Neither the Hybrid UPS systems nor the UPS Controller have direct control over this transfer, and do not need to control the ATS for proper system operation. The UPS Controller will accept input signals from an external transfer scheme in order for its local display to provide an overview of the state of the system. Refer to instruction provided by the building management system integrator or equipment installer for how to activate the transfer scheme. 3.10.1. Transfer from Hybrid UPS to Utility Power When a transfer scheme moves the critical load from the output of the Hybrid UPS systems to the utility source, the Hybrid UPS systems will see a load drop, but will continue to supply voltage to their load outputs, regardless of whether they are operating in UPS Mode or High Efficiency Mode. If the system was in the High Efficiency Mode, all power from the turbine generators will be delivered to the utility power connection. If this transfer to utility power is only intended to be temporary, the Hybrid UPS systems can be left in the desired operating mode where they will remain ready for retransfer of the critical loads. If the transfer was for service or other reasons, the system can be shut down as described below. 3.10.2. Transfer from Utility Power to Hybrid UPS Once a Hybrid UPS system is started and operating in either UPS Mode or High Efficiency Mode, it is able to accept a block transfer of loads that were previously powered by the utility source. Since there will be no inrush currents associated with motor starting or transformer magnetization during a closed transition transfer, the Hybrid UPS systems will simply see a step load change within their steady state power capability. This may result in a brief voltage drop at the output of the Hybrid UPS system, however a properly designed installation should maintain sufficient power quality to meet the requirements of the critical load. 3.11. System Shut-down The Hybrid UPS system is designed for continuous operation, and will not be shut down in normal operation. There are several means to shut the system down, depending on the urgency of removing power from the critical loads. 3.11.1. Normal Shutdown A normal shutdown would typically be done after the critical loads have been transferred to the utility power source (as described above), or the loads themselves have been shut down for service reasons. A normal shutdown process will transition the system from either of its operating modes (UPS Mode or High Efficiency Mode), to the Standby Mode. Page 34 of 71 400027 Rev B (August 2013) 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 MicroTurbine Model C65 Hybrid UPS User's Manual
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