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Do I size the V1K output filter to match the drive input current or the motor full load current rating?

Output devices are sized based on the load itself. The load determines the current that will be drawn through the filter. Merely size the filter based on the full load amp, (FLA) rating of the motor. We suggest you size the filter no more than 110% of the motor FLA to ensure a proper match between drive, load, and filter.