User manual 09/2009 - Schneider Electric

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User manual 09/2009 - Schneider Electric

The Metering FunctionMeasurement AccuracyPresentationMicrologic trip units provide measurements:• Via the communication network• On the front display module FDM121 in the Services/Metering menu.Some measurements can be accessed on the Micrologic trip unit display (see List of Metering Screens,page 28).The tables in this chapter indicate the measurements available and specify the following information foreach measurement:• Unit• Measurement range• Accuracy• Accuracy rangeMeasurement AccuracyThe trip units comply with the requirements of standard IEC 61557-12 in accordance with:• Class 1, for current metering• Class 2, for energy meteringThe accuracy of each measurement is defined:• For a Micrologic trip unit powered in normal conditions• At a temperature of 23°C +/- 2°C.For a measurement taken at a different temperature, in the temperature range -25°C to +70°C, thederating coefficient for temperature accuracy is 0.05% per degree C.The accuracy range is the part of the measurement range for which the defined accuracy is obtained: thedefinition of this range can be linked to the circuit breaker load characteristics.96 LV434104 09/2009

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