Centroid Community CNC Support Forum

martyscncgarage wrote:Given his motors are 160VDC, would direct rectification of 120VAC be too much? I figure rectified would be 169VDC.

I would be more concerned about the drive, than the motors.

See https://centroidcncforum.com/viewtopic. ... 71&p=79927

In my opinion, direct rectification of 120VAC is a compromise that you resort to when you do not have a step-down transformer; cannot afford to buy one; and perhaps have a cabinet that is too small to accommodate one. He already has a suitable transformer in place, so there is no sense in taking it out.

You won't get 380VAC out of a VFD unless you put 380VAC or more into it.

Ldguinn1 wrote: ↑Mon Jan 01, 2024 6:32 pm I am in the US. Was planning on using a VFD to supply 380v for spindle motor.

What is your incoming voltage?
As Marc mentions, you have to have 380v or more coming into the VFD. 240vac single phase won't cut it

cncsnw wrote: ↑Mon Jan 01, 2024 6:38 pm

martyscncgarage wrote:Given his motors are 160VDC, would direct rectification of 120VAC be too much? I figure rectified would be 169VDC.

I would be more concerned about the drive, than the motors.

See https://centroidcncforum.com/viewtopic. ... 71&p=79927

In my opinion, direct rectification of 120VAC is a compromise that you resort to when you do not have a step-down transformer; cannot afford to buy one; and perhaps have a cabinet that is too small to accommodate one. He already has a suitable transformer in place, so there is no sense in taking it out.

I am in agreement with you Marc, the transformer exists so use it.
The All in One DC seems to handle the higher DC Buss voltage (will handle DC servos to 180VDC). My first mill had a Mitutoyo Millstar III and used Glentek 180VDC DC servos and I went with that.
I see the concern about regenerative feedback. My hand wheels were plastic on the knee Mill.

I was only curious if the 160VDC motors could take direct rectification in your experience.

Marty

Ok, So I put 110v through the transformer, came out to 80v after the cap. Had motors out of machine for testing on workbench replaced encoders with ones provided, did a temp plug solution, all motors turn and encoders read correctly. Its a small victory.
I replaced encoders, but when I removed the cover, a gasket? that was between the servo and cover fell out in pieces, Do I seal up with silicone, or is there a place to get new gasket/ seal?

Slow going but got proximity switches on all axes, X and Y home out correctly, but Z is homing out in the Z- direction, is there a way to Invert it? The axis otherwise is moving correctly.

Ldguinn1 wrote: ↑Sun Mar 31, 2024 11:48 am Slow going but got proximity switches on all axes, X and Y home out correctly, but Z is homing out in the Z- direction, is there a way to Invert it? The axis otherwise is moving correctly.

When you jog Z in the negative direction, is it moving in the negative direction?

Please ALWAYS post a fresh report when asking for help. I'd like to see your CNCM.Hom file. If the axis is moving correctly when you manually jog it, you likely need to change the .hom file.
Please let us know

Thank you for the response, Double checked the CNCM.HOM file, it was all correct. I finally got the courage to use the auto homing. It worked as it should. However, when in the setup screen under find home the Z axis only travels in the Z minus direction. I was using that to verify that things were going to act correctly.
I try to tackle one issue at a time. That one is resolved now, on to the next. Lube pump wiring.