I was running a job the other day when I heard a loud POP!, and noticed that my spindle was slowing down. I walked over and hit the EStop, and sure enough the display on the VFD was off. There's wasn't anything obviously wrong (ie. no smoke, no flames, etc).
I wasn't sure what happened, so I thought that maybe it was just the breaker. I checked the panel and the 20A breaker had been tripped. I looked at all my connections and everything was tight.
So, I flipped the breaker back on and went over to the VFD. When I applied power to the VFD, the breaker for the entire 100A panel clicked off! Oh boy. I'm not sure what happened, but the VFD is toast. I'm going to send it back to China for replacement, but I'm seriously thinking about upgrading to a Hitachi XJ200 or SJ200 as my primary VFD.
Any thoughts on what happened? Any ideas? This has functioned flawlessly for 6 months, running small jobs all the time. No problems at all until now.
Steve