I currently hooked up a Power Flex 4 to one of our machines. In order for us to get the feet per minute with our drive we have to run the motor at 100Hz........Now I can changed the FPM of the belt by changing the drive sprocket, but is this needed? Does running a drive faster do any harm to an AC Motor? Would are some opinions? Changed the drive sprocket or run motor at higher HZ through VFD? Thanks