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Why is there a difference in the I/P Voltage Measured and the displayed Mains Voltage Parameter ULn of the Altivar 61/71 Drives.

The Mains Voltage Parameter ULn reading is calculated from the DC bus voltage.

The reason for the difference in the Incoming Voltage measured with Multimeter and that displayed in the Mains Voltage Parameter (ULn) is due to the DC Bus undulation (ripple).

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