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Download ATS48_AO Analog output assigment calculation
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ATS48 AO Analog output assigment calculation & scale Motor current OCr -> Directly from the current measurement of the ATS48 Motor torque Otr -> proportional to the power at steady state when the starting time is finished. During acceleration or deceleration, the stator losses are taken into account. Active power Stator losses Rs I2 Mechanical power Cm. s Motor thermal state OtH -> (current measured/IN)² and filters calculation to take into account the thermal constants time and the class (tHr parameter) of the motor. Cosinus phi OCO -> OV point known with the voltage synchronisation and known with the current measurement. The angle between the voltage and the fundamental current H1 is known. So, Cos is known. 0V point known with the voltage synchronisation Current Fundamental H1 known because it is the command to the thyristors or from the current measurement when the ATS48 is bypassed. Active Power OPr -> 100.[(LCR parameter value * Cos calculated OCO) / (IN parameter value * Cos nominal)]. Cos nominal is not visible by the customer (inside the memory of the product). AO scale Parameter X on AO Motot current Motor torque Motor thermal state Cos Active power Min Max values depending on ASC parameter Output on AO Min Max Min Max Min 0 ASC/100.IN* 0 ASC 0 0-20mA : X (%) Is 20mA ASC 0 mA 20 mA 0 mA 20 mA 0 mA Max Min Max Min ASC 0 ASC 0 20 mA 0 mA 20 mA 0 mA 20 mA 4 mA 20 mA 4 mA Max ASC 20 mA 20 mA * IN: motor nominal current which is a parameter to set. 4-20mA : Is 16mA X (%) 4mA ASC 4 mA 20 mA 4 mA 20 mA 4 mA