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Capstone Turbine Corporation 21211 Nordhoff Street Chatsworth CA 91311 USA Technical Reference: Capstone C65 Electrical Table 13. Connector J14 – Analog Input Functions Function Description Not assigned Electrical Power Demand CHP Water Flow Rate CHP Temperature Feedback Propane Temperature Feedback Electrical Power Demand CHPWaterFlowRate CHP Temperature Feedback No software function assigned (Default). Provides output power demand feedback Provides water flow feedback if iCHP option is installed. Provides temperature feedback if iCHP option is installed. Input can be used for thermal load following. Reserved (Do not use) Table 14. Analog Input Limits 0W 0 V 0.9 V (3.6 mA) 2090000W 5 V 4.5 V (18 mA) 0gpm 0V 0.9V(3.6mA) 80gpm 5V 4.5V(18mA) 32 °F 0 V 0.9 V (3.6 mA) 212 °F 5 V 4.5 V (18 mA) Function Low Limit High Limit Minimum Signal Type Maximum Signal Type 0-5 V 4-20 mA 0-5 V 4-20 mA 5.6.2. Analog Input Scaling The high and low limits entered in CRMS for an analog input function are used by the microturbine software as the starting and ending points of a linear scale. As shown in Table 14, the scale is different depending on whether the signal type is 0-5 V or 4-20 mA. How this scale is generated for each signal type is described below: Signal Type 0-5 V: The range of values is scaled between 0 and 5 Volts. Using CHP Water Flow Rate as an example, a voltage signal of 0 V represents 0 gpm and a voltage signal of 5 V represents 80 gpm. Therefore, a midrange voltage signal of 2.5 V would represent 40 gpm. Signal Type 4-20 mA: The software establishes a range between 0.9 V to 4.5 V for this signal type as shown in Figure 22. Fluctuations above and below this range can be misread by the system. The signal is treated as a fault if it is greater than 18.8 mA or less than 2.8 mA. Using CHP Water Flow Rate as an example, a current signal (using a 250 Ohm resistor) of 3.6 mA (0.9 V) represents 0 gpm and a current signal of 18 mA (4.5 V) represents 80 gpm. Therefore, a midrange signal of 10.8 mA (2.7 V) would represent 40 gpm. 410001 Rev N (August 2013) Page 38 of 43 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 | Technical Reference Capstone Model C65 Electrical
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