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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA User’s Manual: Advanced Power Server (APS) Model 145 User's Manual 3.4.4.1 Electric Priority with Thermal Tracking For electric priority mode, the APS provides the electric load following logic and controls the power output of each turbine accordingly. The temperature measurements and setpoints that control the thermal output of the Heat Recovery Module (HRM) on each ICHP turbine can be done individually at each turbine or as a group through the APS. Using its integrated Resistive Thermal Device (RTD), each ICHP turbine can measure the HRM’s inlet or outlet water temperature, or it can accept a 4-20 mA signal from an external temperature sensor. This temperature measuring setup must be done for each ICHP turbine through the normal CRMS software or through the local control panel of each turbine. If the APS is to be used for a group’s temperature measurement, it may require some PLC programming plus a temperature input signal source. The source can be from an RTD using the optional PLC RTD input module, from an external temperature sensor using the optional PLC Analog current or voltage modules (e.g. 4-20 mA), from a temperature sensing system where the APS is acting as a Modbus master (e.g., a control system for an absorption chiller), or from temperature data provided by a building management system where the APS is acting as a Modbus slave. This provides a great deal of flexibility in setting up thermal recovery systems. However, care must be taken in the system design to avoid situations where the operating mode turns off ICHP units that need to provide heat recovery, or operates them at low power (thereby limiting the amount of recoverable thermal energy). 3.4.4.2 Thermal Priority For thermal priority mode, each ICHP turbine’s exhaust diverter is locked in the full heat recovery position and thermal output is controlled by adjusting the electric power output. Both temperature measurements and temperature setpoints must be done at the APS, since the APS is providing the control commands to each ICHP turbine in the group to adjust its electric power output to maintain the desired temperature. As noted above, the temperature measurement input to the APS can come from a variety of sources, and may require some custom PLC programming. Likewise, the temperature setpoint in the APS can come from a variety of sources, including manual user input or dynamic data read from a building management system where the APS is acting as a Modbus slave. 3.4.5. Load Balancing In the load balancing mode the load is shared equally among all of the turbines in a group. All turbines in the group that is operating in load-balancing mode are turned on. This algorithm then takes the power demand of the group and equally distributes the load to each turbine in the group until it reaches 100% capacity. This mode is available for Grid Connect or Stand Alone groups. 3.4.6. Maximum Efficiency The maximum efficiency mode employs a control algorithm that tries to run the turbines in a group at full power output, where they are at maximum efficiency, and turn off the turbines that are not needed to meet the power demand. By doing this, the group maintains maximum efficiency and thereby minimizes fuel costs. This mode is also available for Grid Connect or Stand Alone groups. Settings for Stand Alone mode help prevent a potential step load from overloading the currently running turbines. 400026 Rev E (March 2014) Page 24 of 56 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 | Advanced Power Server (APS) Model 145 User's Manual
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