[RE-wrenches] two VFX3524's and a Franklin 3hp sub pump

[jay peltz]

Hi Kurt,

A very good idea.

Do you know how much more efficient the 3 phase is vs the single?

Thanks,

jay

peltz power


On Jun 24, 2010, at 10:41 AM, Kurt Albershardt wrote:

> Once you determine the real pump requirements (as others have mentioned, this is critical - IME particularly if the "well guy" sized and sold the pump) and if a larger than SQflex pump is needed, I have had good luck using VFDs to drive three-phase pumps with single phase power.  You can pay Franklin the big $$ for their system, but a commodity VFD from someone like Automation Direct will set you back about $100/HP and (up to 3 HP) will accept single phase input power.  This gets you sophisticated motor protection, programmable ramp soft starts, restart delays, and a plethora of input and output terminals for shutdown switches, PID sensor inputs, etc. and will allow you to create all manner of interesting system behavior.  Most also include a (software programmable) runtime limitation or alarm which can prevent  scenarios like Chris described below.  3-phase motors are more efficient anyway so I seriously doubt we will sell a traditional single phase pump or fan again.
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