TCI has designed and tested the MotorGuard filter with technical input from the major drive manufacturers as well as actual lab testing to ensure compatibility. TCI cannot be responsible for ongoing changes in drive topology. To date, the filter has been successfully operated with a multitude of drives. TCI feels confident the filter will be compatible with all major drive topologies. If the filter fails to function due to drive topology incompatibility, TCI will accept return of the filter for full credit.