If a 60 Hz equipment needs to be run off a 50 Hz power supply (3 phase, AC) what are typical options? One brute force approach is to simply change motors. But I was wondering if a VFD / thyristor or some such might work? This is medium sized equipment with rating of ~5 kW. As an aside, were someone to accidentally cross connect a 60 Hz rated motor to a 50 Hz supply would the results be disastrous? Is the risk symmetric? i.e. A 50 Hz motor connected to a 60 Hz supply?