Coolant pumps in reverse

**Stustoys** · 7th August 2010, 12:22 AM

I don't know if its dual voltage Jekyll and Hyde and its way to cold out there to check tonight.
I think, given the expence of the inverter, I will keep the 3 phase pump as a spare.

As far as the mill goes I was just sick of the time amd expence of going to look at them. By the time I add DRO some cleaning up and the inverter, I wont have much left from the price of a HM52D. Then there is "is the extra Y better then the hoz spindle" etc etc lol

Have one now, to late to change my mind lol
Stuart

**Jekyll and Hyde** · 7th August 2010, 10:50 AM

Originally Posted by Stustoys

I don't know if its dual voltage Jekyll and Hyde and its way to cold out there to check tonight.
I think, given the expence of the inverter, I will keep the 3 phase pump as a spare.

Exactly my reason for deciding on a Steinmetz connection - you can run 240v 3 phase motors off 240v single with a couple of capacitors. No VFD required. You could do the same with the spindle motor if desired, but it may burn it out over a period of time, and there is reduced power and torque, not to mention the motor won't run as smoothly (bad surface finishes). If the pump blows up its only $100 odd for a single phase one from H&F, spindle motors are a little more expensive....

The VFD won't even know the pump is there, as the pump is being supplied 240v single phase before the VFD.

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