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Old 02-27-2008, 11:16 AM
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I use the VFD as a phase converter. It was the only way, I could figure, to get 3ph power into the mill. Though, I do wonder why the system, single phase hardware (pc electronics, drives, servos) would use 3ph power only to convert it back to single.
Are you suggesting I break out the spindle motor and run it seperate off of the VFD and provide single phase 120v for the electronics? I'll have to take another look at the schematic drawing.
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Old 02-27-2008, 12:28 PM
 
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I could be wrong but I don't think a VFD phase converter puts out the right 3 phase signal on the legs to really properly power a cnc bridgeport. Sure it would power the motor alone just fine and give you electronic variable speed in additoin to the belt CVT stuff in the head.

But I think it would make a mess of what the controller is trying to see.

Rotary phase converters are the only way to go with a CNC mill assuming you don't go through the trouble of altering things inside to separate the single phase stuff from what was 3 phase converted back to single.

Asside from that the machine will click celinoides (air or electric) when hitting one of the 2 buttons needed to trigger the spindle to start.

For example if I hold down my "enable spindle" button but don't twist the High/Low switch my mill triggers the break air to release in expectation the motor button will get twisted which would trigger another relay starting the motor . So the clicks are normal for pressing those buttons.

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Old 02-27-2008, 01:14 PM
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Originally Posted by wcarrothers1 View Post
I could be wrong but I don't think a VFD phase converter puts out the right 3 phase signal on the legs to really properly power a cnc bridgeport. Sure it would power the motor alone just fine and give you electronic variable speed in additoin to the belt CVT stuff in the head.

But I think it would make a mess of what the controller is trying to see.

Rotary phase converters are the only way to go with a CNC mill assuming you don't go through the trouble of altering things inside to separate the single phase stuff from what was 3 phase converted back to single.

Asside from that the machine will click celinoides (air or electric) when hitting one of the 2 buttons needed to trigger the spindle to start.

For example if I hold down my "enable spindle" button but don't twist the High/Low switch my mill triggers the break air to release in expectation the motor button will get twisted which would trigger another relay starting the motor . So the clicks are normal for pressing those buttons.

b/
Thanks for the info, I've been studying the schematics and am considering breaking out the 120v components. There are two transformers indicated powering the different hardware components.
Initially it appears to be pretty straightforward though i'll have to give this some carfull consideration first.
Owen
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