3 phase stuff

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Forum topic by Loren posted 09-17-2012 04:54 PM 770 views 0 times favorited 3 replies Add to Favorites Watch
View Loren's profile (online now)


10114 posts in 3584 days

09-17-2012 04:54 PM

I now have two 3-phase machines.

I think I’m getting a habit.

Anyway I have one of them running on a VFD and it’s working

The machine I just got however has 2 motors and you turn
them on or off as you want them. It’s a line drill and one
motor turns half the drills and the other turns the others.

To run it on VFD I think I’d need 2 units and so forth, 2 power
cords and all that. From what I’ve read there is a way to run
2 identical motors off one VFD but then I’m bypassing the
or replacing switches on the front of the machine, etc… and
it gets to be a rewiring project rather than a just-get-it-running

I though I could just run it through a static converter I could
bolt inside the cabinet, but from what I’ve read the static
converters won’t start 2 motors.

So I’m looking at getting 2 static converters, 2 VFDs or
maybe biting the bullet and getting into the expense of
a rotary converter.

Any advice?

The machine will be run only intermittently and motor
overloading is unlikely.

3 replies so far

View Bill White's profile

Bill White

4880 posts in 3896 days

#1 posted 09-17-2012 05:04 PM

Loren, sounds like ya need to talk with an industrial electrician. Some of the elec. needs require a real professional.
Just my thoughts.


View MrRon's profile


4676 posts in 3179 days

#2 posted 09-17-2012 10:26 PM

Get a rotary converter and all your problems will vanish.

View Mainiac Matt 's profile

Mainiac Matt

7817 posts in 2264 days

#3 posted 09-18-2012 12:50 AM

RPCs especially shine when more than one 3 ph motor is running.

-- Pine is fine, but Oak's no joke!

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