On 01/03/2018 10:03 AM, Dave Cole wrote:
Some of the "Driveswarehouse" type places sell solid state
"phase converters" that have no speed control, but they
seem to cost as much or more than the equivalent sized
VFD. No idea why. It must be driven by the marketplace.
Yup, in the basements of most of our buildings at work,
there are RACKS of VFDs that run ventilators, circulator
pumps and other stuff like that. We probably have at least
1000 units, all controlled by an energy management system.
Many establishments have the same. So, the world is awash
in VFDs, new and used. These places all have 3-phase power,
but are using the VFDs for energy conservation, mostly. The
market for devices to provide just a 3rd phase from
single-phase power is much smaller.
Jon
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