dU/dt have IP54 protection class
Danfoss VLT frequency converters in IP54 version can now be equipped with du/dt filters with the same protection class IP54. du/dt filters reduce the du/dt values on the motor terminal phase-to-phase voltage – an issue that is important for short motor cables. The du/dt filters reduce the motor insulation stress and are recommended in applications with risk of flashover. Compared to sine-wave filters, du/dt filters cut off frequencies above the switching frequency. Having small inductance and capacitance, the price of the filter is lower.
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