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Capstone Turbine Corporation Model C65 Hybrid UPS User’s Manual For example, the external building management system may be set up to poll selected fault registers and signal users of certain conditions, such as: External Battery Power is Unavailable – if the system is experiencing extremely low battery state of charge or there is a fault on the battery bus, then the Hybrid UPS system can no longer guarantee power output would be available in case the utility becomes unavailable. This is not an Imminent Shutdown alarm in the sense that it should drive automatic transfer of power to the utility source, since the Hybrid UPS system is still able to deliver utility power to the load. However it should direct facility personnel to correct the problem immediately, and could also be a reason to command the Hybrid UPS systems into High Efficiency Mode so at least there would be turbine power available in case of a utility outage. Fuel Source is Unavailable – if a loss of fuel pressure fault is present, it means that turbine power will not be available to supplement the external battery in the case of an extended outage. This is neither an Imminent Alarm nor an Orderly Shutdown alarm, but facility personnel should be alerted to correct the problem so the system will be capable of supporting an extended utility outage. A list of the available fault registers is provided in the UPS Controller Technical Reference (410081). 3.13. ICHP Operation The ICHP system has three modes of operation. These are: Thermal Bypass (default) Electrical Priority Thermal Priority 3.13.1. Thermal Bypass In this mode, the exhaust diverter is locked in the fully bypass position, and the microturbine can operate with a minimum water supply flow. The water flow must be able to absorb 3kW of thermal energy transferred from exhaust. This mode may be used when thermal demand is extremely low compared with the electrical load. All normal microturbine control modes are supported. 3.13.2. Electrical Priority In this mode, electrical power output is set to the desired level, and water temperature is set to a fixed temperature setpoint, allowing independent electrical and thermal operation. Efficiency will vary depending on both electrical and heat load requirements. Electrical Priority can be used in either Grid Connect or Stand Alone modes of operation. In Grid Connect, the microturbine is set to a fixed electrical output (in most cases, the maximum output), and water temperature is set to a fixed setpoint. During operation, the diverter adjusts exhaust flow through the heat exchanger to maintain water temperature. System efficiency will drop as exhaust is bypassed to maintain water temperature. Page 38 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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