How to put in 2nd 3 phase switch?

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Forum topic by Loren posted 10-09-2013 07:12 AM 1282 views 0 times favorited 8 replies Add to Favorites Watch
View Loren's profile


10371 posts in 3641 days

10-09-2013 07:12 AM

Bought a 3hp 3 phase dust collector. Switch is on the motor
where I’ll have to walk over, bend down and push it. Machine
makes plenty of sound so I want to have a switch at eye
level on a wall or something because I like quiet in the shop
when I’m not machining.

What type of simple switch could I use in a box on the wall
to toggle the collector on and off?

I have to have my rotary converter running to have 3 phase. If
I leave the collector turned on while connected to the converter,
the converter will pop the breaker as it tries to start to idler
and the dust collector at the same time.

8 replies so far

View Charlie's profile


38 posts in 1705 days

#1 posted 10-09-2013 08:37 AM

View Fred Hargis's profile

Fred Hargis

4980 posts in 2486 days

#2 posted 10-09-2013 11:55 AM

This would be a little cheaper, but not by much. You might find a used one on e-bay.

-- Our village hasn't lost it's idiot, he was elected to congress.

View Ralph's profile


166 posts in 2126 days

#3 posted 10-09-2013 12:35 PM

Another option:
May be able to put the contactor on the DC, and run a switched 120V line to the coil. Not sure of the total cost.

-- The greatest risk is not taking one...

View bigblockyeti's profile


5111 posts in 1714 days

#4 posted 10-09-2013 12:42 PM

The cheapest route (it would not meet electrical code) would be a simple two throw toggle switch that turned off two of the three phases, leaving one hot, but the motor off. If you plan on turning the switch on and off frequently, you could get a used disconnect from any three phase equipment (commercial A/C condensers are the easiest to find) with a rating substantially higher than your DC so as to not wear out prematurely as most disconnects aren’t used every day as switches. Another consideration is to make sure your DC doesn’t have a magnetic starter or every time you shut it down, you’ll have to turn on whatever eye level switch you settle on and reach down to turn it on at the motor.

View crank49's profile


4030 posts in 2964 days

#5 posted 10-09-2013 01:16 PM

Does the collector have a mechanical switch or a magnetic starter?
The magnetic starter is the preferred method because it can have multiple inputs to start or stop the machine it is controlling.

For example, if you were to want the collector to come on when you start the jointer or the planer or the TS. That is easy to do, and you could also interlock the blast gates in the ductwork to these machines and incorporate the phase converter as well so that the phase converter would com on and then the collector would start when ever the conditions are all met.

View Bluepine38's profile


3379 posts in 3078 days

#6 posted 10-09-2013 01:50 PM

If you are not planning on using that switch on the motor, why not just move it to the spot where it will be
easier to use. If you are not into bending metal conduit, plastic conduit is easy to run and readily available.
If you are not real familiar with wiring, take a few digital pictures and make sure all wires are marked or
labelled before you start and it should be fairly easy. You might have to customize a junction box and/or
cover plate to do this.

-- As ever, Gus-the 79 yr young apprentice carpenter

View Loren's profile


10371 posts in 3641 days

#7 posted 10-09-2013 03:47 PM

The switch is not magnetic. It stays on if it’s on when power is
cut… that’s how I popped the circuit starting my 3 phase idler.

I may remove it like you suggest… put it higher up on a pipe
welded to the dust collector frame or something.

View Bill1974's profile


124 posts in 2978 days

#8 posted 10-11-2013 02:36 PM

I would suggest putting a contactor in a box with a low voltage transformer and put low voltage switches where you need them.

Get a contactor that cut all three phases, and get a transformer that will work with 2 of the 3 phases to supply power to the remote switches and close the contactor when you want the dust collector to run. Grainger will have everything you need. Any electrical supply place should have everything you need. I don’t think the Big box stores carry much if anything for 3 phase stuff.

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