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Old 02-05-2007, 04:11 PM   #1
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Single to 3 phase invertors/converters


Hi Guys/gells I'm mr Newbee!!!!

I'm after a bit of help in getting a 3 phase industrial circular saw, to run from my single phase 240v supply......
I've got a 415v invertor?/convertor? (very old) from a local garage that used it to power the car lift and wired it in, and i tried the motor in both STAR and DELTA but it will not run. I know a little about electrics and motors but nothing to shout about so i thought i'd ask you guys.... but go easy on me, so i can take it all in
Any help much appreciated..

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Old 02-05-2007, 05:20 PM   #2
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Single to 3 phase invertors/converters


You could troubleshoot it further by CAREFULLY measuring each line to ground, and to eachother to make sure you have the power correct... post the results

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Old 02-05-2007, 05:28 PM   #3
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Single to 3 phase invertors/converters


Post specs on the saw and the inverter.
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Old 02-06-2007, 07:53 AM   #4
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Single to 3 phase invertors/converters


Also may want to try the power tools forum on woodnet.
http://www.forums.woodnet.net/ubbthr...at=&Board=UBB2
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Old 02-07-2007, 03:49 AM   #5
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Single to 3 phase invertors/converters


Hi TroubleX....
I've checked each line to ground and i'm sure that.
BLACK is 393v ish
BLUE is 234v ish
RED is 193v ish
Is this the problem shouldn't each phase be 240v or 415 phase to phase to run, i'll try and get more info on the inverter...
Thanks guys.
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Old 02-07-2007, 10:19 PM   #6
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Single to 3 phase invertors/converters


the voltages look a little suspect. What's the requirement of the saw motor?

"STAR and DELTA" is known at "WYE and DELTA" also. Delta means triangle shaped, WYE is, well, like a "Y" shape. Anyways. STAR/WYE expects three lines and a neutral (4 wires total).

DELTA configuration assumes a balanced load, therefore, no neutral required... just the three lines.

What's your measurements line to line?

In WYE, the voltage between any two lines is 1.7 times the voltage from a line to neutral. In DELTA, the voltage should be the same between all the lines...

Post some model numbers too...


Last edited by elementx440; 02-07-2007 at 11:06 PM.
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Old 02-09-2007, 09:20 AM   #7
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Single to 3 phase invertors/converters


Hi Guys
I've had a look at the inverter/converter (which is it any how?)
but i can't find a make anywhere on it.
The saw is a dewalt circular saw with 18" blade 3HP motor it came from an industrial work place with 3 phase supply and could be plugged straight into the wall via a round 4 pin plug.
I've taken a picture of the inners of the inverter to show the links.



Does anyone know what the letters R.S.T stand for on the armoured cable link, i've connected the L N E to the mains and the armoured cable to the stop start box on the saw where the original plug was, the others must be to control the voltage are they?. ( is this correct)......
If i'm trying to run the saw from a single phase supply, the inverter capasators splits the 240v supply into 3 for the U,V,W phases,
So across each phase i should get a reading of 415v....

As it's wired now when you hit the start button the saw blade attempts to run but the start button wont hold in and just breaks contact......all in a thousanth of a second.

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