Existing reviews of 60 hp (45 kW) VFD, 3 Phase 240V, 380V, 480V
In my option, it depends on the horsepower of the motor. The costs of motor under 60 hp doesn't not justify insulating either bearing. 75 hp (360 frames) to the end of t frames roughly 250 hp in a 4 pole, i would just insulating one bearing. Everything after t frames I would insulate both bearing if being used on a VFD. After 2000 hp I would insulate and add a shaft grounding ring for insurance. The level of protection must be weighted against how critical the motor is, and the costs of the protection versus the costs of replacement/time to reorder.
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