WAGO SYSTEM 750 User Manual
Also see for I/O-SYSTEM 750: ManualManualTechnical descriptionUser's installation and configurationManual
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46 Function Description WAGO-I/O-SYSTEM 750750-493 3-Phase Power Measurement ModuleManualVersion 1.2.05.4 Measuring Errors and AccuracyThe measuring errors of the I/O module are specified in the table below. Thevalues already take into account the errors caused by the connection method(single-ended 0.1%) and the calibration tolerance (0.1%). They apply to the entiretemperature range of 0 to 55 °C and to frequencies of 45 to 65 Hz. Outside thisfrequency range, the error is max. 2%.Table 24: AC Measuring ErrorsAC Measuring Errors 750-493, 750-493/025-000, 750-493/000-001 and 750-493/025-001Voltage <= 0.3% of full-scale valueCurrent <= 0.5% of full-scale valueActive power <= 0.5%Frequency 0.01 HzThe measuring accuracy of the I/O module falls when an RMS voltage falls below45 V. This state is called ZC limit and is displayed via the "D" LED (SAG LED).The following conditions can also degrade the measuring accuracy of the I/Omodule:1. If only one or two phases of the three-phase supply network are connected,higher measuring errors can occur in the voltage measurement (+0.1%).2. In AC networks only:If all phases fall below the ZC limit, accurate measurement of phase angle,frequency and current are no longer possible. The measuring accuracy of allcurrent-depending variables (current, power, energy) falls off by 0.4%.3. Near the ZC limit, the accuracy of the phase angle measurement decreasesto a value of ± 1.5 °.4. If a current measuring input operates near no-load, higher measuring errorscan occur for this measuring path. Therefore, the measured current shouldbe min. 75 mA for 750-493 resp. 100 mA for 750-493/000-001.For DC measurements, the error is <= 1% of the full-scale value for current,voltage and power.Pos : 71 /D okumentation allgemei n/Glieder ungs elemente/---Seitenwechs el--- @ 3\mod_1221108045078_0.doc x @ 21810 @ @ 1 |
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