Measurement Accuracy
Presentation
MicroLogic trip units provide measurements available:
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Using the communication network
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On the FDM121 display in the or menu.
The measurements indicated in the following list can be accessed on the MicroLogic trip unit display.
The tables in this chapter indicate the measurements available and specify the following information for each measurement:
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Unit
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Measurement range
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Accuracy
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Accuracy range
Measurement Accuracy
The trip units comply with the requirements of standard IEC/EN 61557-12 in accordance with:
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Class 1, for current metering
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Class 2, for energy metering
The accuracy of each measurement is defined:
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For a MicroLogic trip unit powered in normal conditions
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At a temperature of 23 °C +/-2 °C (73 °F +/-3 °F).
For a measurement taken at a different temperature, in the temperature range ‑25 °C to +70 °C (‑13 °F to +158 °F), the derating coefficient for temperature accuracy is 0.05% per degree.
The accuracy range is the part of the measurement range for which the defined accuracy is obtained; the definition of this range can be linked to the circuit breaker load characteristics.