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How does the Altivar 61 and Altivar 71 drives measure the line voltage parameter ( ULN ).

The measurement of the line voltage is done by the parameter ULN.

This value display come from the DC bus ,
ULN = Vbus/rootsquare (2)
The accuracy of the measurement depends of the state using drive
 
Accuracy with no load < 5%
 
Accuracy motor loaded is 10%~15%
 
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