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Capstone Turbine Corporation Model C65 Hybrid UPS User’s Manual 2.4.4. Standby Mode In Standby Mode, the Hybrid UPS system is completely taken out of service and shut down. No power is taken from the utility grid, or provided to the load output, and the turbine generator is off. If left in this state for an extended period of time, the system will also attempt to preserve energy storage life by entering a sleep mode to reduce power requirements, and the Display Panel will go dark. This is the condition the Hybrid UPS system will be in when shipped from the factory. 2.4.5. States versus Operating Modes In the Hybrid UPS system, there are both Systems States as well as Engine States, which together determine the Mode of Operation. Figure 5 provides an overview of the general flow of System and Engine States from one commanded Operating Mode to another. 2.5. Transition States The user can command the Hybrid UPS microturbines to be in UPS Mode, High Efficiency Mode, or Standby Mode. However, there are certain required conditions for the system to enter any of these operating modes, and it will transition through multiple states in order to reach the desired operating mode. Emergency Mode is not a user-commanded operating state, but rather is the result of the utility grid being unavailable while the system is being commanded to operate in UPS Mode or High Efficiency Mode. 2.5.1. Elements Impacting Transitions The major elements that impact these transitions between states are described in the following paragraphs. 2.5.1.1. Battery SOC If the battery state of charge is below some preset limit (for example 50% SOC), the turbine may need to be started to allow transition into the next operating state. This is because the Hybrid UPS system should always be capable of continuing to power the critical load once it starts to provide power. If the battery SOC is too low, there may not be sufficient energy to maintain power in Emergency Mode should the utility suddenly become unavailable. For Hybrid UPS systems with external battery systems provided by others, the Capstone UPS Controller must receive ongoing state of charge information. The UPS Controller will then assure the proper transition sequence. Consult Capstone for how their individual battery packs will provide this SOC information to the Hybrid UPS systems. Page 24 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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