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Do I still need to purchase a V1k filter for the output of my drive if I am using an inverter duty motor?

If you can add the low cost of the filter to your long lead drive application to preserve and extend the life of your drive system, it is typically very well spent dollars. Considering the cost of the motor, removal, re-installation, and the associated downtime and cost of frustration, the cost of the filter is minimal. Regardless if the motor’s insulation system can handle the spike voltage, it will be much less stressed and burdened with the filter in place. This will always help extend the service life of the system.