Mark Norfleet Posted November 16, 2020 Report Share Posted November 16, 2020 52 minutes ago, Don Noon said: The marginal result is that I'm using a VFD advertised as "1HP" and using only 1 phase of the 3 to run a 1HP single-plase dust collector. Yup, and I suspect that is torturing your motor. It's a matter of degrees... Time will tell... 3 phase VFDs and variable DC drives work fine at speeds well below 50% of rated motor speed. But there's always the cooling issue, which can be mitigated with a separate fan. There are so called VFD rated motors built with more insulation than has been used in the past, but they're expensive. That said, many have used VFDs on older motors for decades without incident. Quote Link to comment Share on other sites More sharing options...
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