3ph question update.

mgriff543 · Jul 24, 2016

I finally got tired of thinking about the magnetic switch on my radial arm saw and just swapped in a plain old 3-pole switch. After doing some research and listening to you guys next time I'll use a variable frequency drive.

David G · Jul 24, 2016

Most of the newer VFD's support safe torque off and do not require a contractor, it is prudent to use a contractor on the older ones.

Hanky · Jul 24, 2016

And you can set up the VFD to stop the blade faster instead of having it coast down.

Stephen Newell · Jul 24, 2016

Where are you getting three phase power though? There would have to be three legs of power from somewhere.

David G · Jul 24, 2016

Yes, you can use dynamic braking, like the locomotives do, but it requires a resistor.

David G · Jul 24, 2016

You can run most VFD's on single phase, just have to upsize them to compensate for the lost phases.

mgriff543 · Jul 25, 2016

I'm using a static phase converter to run the saw.

David G · Jul 25, 2016

You would not need that with VFD

Geo-TH,In · Jul 26, 2016

David, My miter saw using dynamic braking by shorting out the wires when the switch is turned off, no resistor. Miter saw is a universal motor. Will dynamic braking work on 3 phase motors, no brushes? It been years since I worked on 3 phase motors. Then the 3 phase was really 3 phase. Except for helping my dad make phasers the old school way for farmer's grain drying motors and irrigation pumps. Dad made static and dynamic phasers. Don't think VFD were invented back then.

3ph question update.

mgriff543

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David G

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Hanky

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Stephen Newell

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David G

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David G

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mgriff543

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David G

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Geo-TH,In

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