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Bridgeport, Single Phase to Three Phase
February 26, 2013
11:42 PM
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February 27, 2013
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Hi new guy here I would just buy a phase converter and call an electrical guy in to wire it. there is lots of info on the web as to how to do it but if your not comfortable hire a pro...

it's good money spent!!! I did my own but I have a retired industrial electrical tec as a neighbor to watch over me. In the box on your mill there is a step down transformer for the 110 and a lot of other stuff setting up a phase converter is good money spent.


February 18, 2013
1:58 AM
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February 14, 2013
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Thanks for the reply.  I understand your reply and agree.  The data plates on the Acu-Set drive motors indicate they are 115 volt.  All the wiring to these auxiliary items originate from a large (approximately 2'x2') electrical box on the back of the mill.  When I received the mill there was only one electrical feed to the mill, the 3 phase that ran into the box.  (The person that dismantled the mill cut those feed wires leaving a pigtail attached so I know where they attach.) I concluded from what I had on my mill that there was a component inside the electrical box that converted the 3 phase, 230 volt to single phase, 115 volt.  (I know that sounds over-complicated but it had only one set of feed wires.)

Am I to understand there is a separate single phase, 115 volt supply that feeds into that electrical box that powers the CNC, display screen and the drive motors ? 


I don't have be benefit of a wiring diagram.           


February 15, 2013
12:15 PM
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February 16, 2011
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The VFD only powers the motor of the mill.  Accessories such as feeds and DRO are powered by standard wall current.  In other words, two separate circuits.

February 14, 2013
10:51 PM
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February 14, 2013
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I'm stumped.  I was fortunate to acquire a fully optioned CNC Bridgeport horizontal mill .  My problem is it's a three phase mill, and my shop does not have three phase power.  Wiring it with three phase is not a viable option.  I'm reading about VFD"s (variable frequency drives) and it appears to be the route to take.  The VFD takes single phase, 230 volt power and "converts" it to three phase.  I'm primarily concerned about the CNC and auto-feed components on the mill as they are 115 volt.    


Does anyone have any experience with this situation.  All comments are welcome.


Thanks, Tom

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