I just got home from a service call where every single vfd(15-20HP AC Techs), about 8-9 total had smoked in a potato storage. They all had bulging, blown apart capacitors. The customer stated the power went out for about 10 min. and then came back on line but they may have also lost a phase in the process for a short time.
Are the blown capacitors more indicative of a power surge or phase loss? I don't know if I should try and sell them on a surge suppressor or phase fail relay, although I'm sure both would be a good idea. Any recommendations on surge suppressors? This is a 480 wye service.
They have several other potato storages also, this just happened to be the only one running at the time when the power went out.
