[rjwims]

Not sure what .5 .6 efficiency you are looking at.

I did not get what you meant, with the Grounding as you should be checking it in continuity mode, not resistance for that test.

In another thread (https://www.cnczone.com/forums/spind...466-cnc-2.html) you said

"And the correct EMI Power Filter I recommend does a better job than this line reactor

Posting information from the likes of Yaskawa or from any Drive manufacture, you first have to have an understanding of the subject and have experience with this, before you post something you know nothing about"

You were discussing Power correction factor with some of the usual suspects. What came up was that Vfd's were very inefficient and had to be severely derrated. Some saying down to 60% or so and that possibly a reactor or your recomended TDK filter could boost that up somewhat.

with respect to chinese spindle grounding, I had continuity between the #4 pin and the spindle case. I grounded pin 4 to the VFD anyhow, for good measure.

Sidebar: How does that work with ceramic balls in the bearings resulting in no path to ground?? unless there is some kind of grounding brush or whatever.

Did I clear anything up or add to the confusion....lol

[mactec54]

In another thread (https://www.cnczone.com/forums/spind...466-cnc-2.html) you said

"And the correct EMI Power Filter I recommend does a better job than this line reactor

Posting information from the likes of Yaskawa or from any Drive manufacture, you first have to have an understanding of the subject and have experience with this, before you post something you know nothing about"

You were discussing Power correction factor with some of the usual suspects. What came up was that Vfd's were very inefficient and had to be severely derrated. Some saying down to 60% or so and that possibly a reactor or your recomended TDK filter could boost that up somewhat.

with respect to chinese spindle grounding, I had continuity between the #4 pin and the spindle case. I grounded pin 4 to the VFD anyhow, for good measure.

Sidebar: How does that work with ceramic balls in the bearings resulting in no path to ground?? unless there is some kind of grounding brush or whatever.

Did I clear anything up or add to the confusion....lol

Some know and some pretend to know. yes, a VFD Drive is automatically derated when you use Single Phase supply to a 3 Phase VFD Drive, some of this can be overcome with trick wiring, but the real difference can only be 1.732 which is the difference between single phase and 3 phase use, so in reality there is only normal electrical losses, VFD Drives are more efficient than if you were just powering an AC motor without the use of a VFD Drive. ( VFD Drives are very efficient )

Ceramic Bearings do create a problem and the rotor should be Grounded, using a brush of some type for Grounding it, as the Rotor charge has to go somewhere, while it is working it will discharge through the tool to the work if it is metal that you are machining, it can also be discharged when doing an auto tool change. but watch changing it by hand as you may get a little Zap, if it has not discharged.

An EMI Power Filter can't boost the power supply in any way, it cleans up the power, and helps with the high frequency harmonics, this is what you are mostly dealing with these High-Speed High-Frequency Spindles

PF. is in play no matter what you are doing with your electrical supply. this is not even something you have to consider.

Power factor correction
Power factor correction is an adjustment of the electrical circuit in order to change the power factor near 1.

Power factor near 1 will reduce the reactive power in the circuit and most of the power in the circuit will be real power. This will also reduce power lines losses.

The power factor correction is usually done by adding capacitors to the load circuit, when the circuit has inductive components, like an electric motor.

[rjwims]

Could you please give an an example of 1.732 single to 3 phase perhaps based on my 8.8 per phase 3.2kw motor

You mentioned Trick wiring. Can you explain

Also, does the attached chart look accurate?

thanks again

[mactec54]

Could you please give an an example of 1.732 single to 3 phase perhaps based on my 8.8 per phase 3.2kw motor

You mentioned Trick wiring. Can you explain

Also, does the attached chart look accurate?

thanks again

I don't think your 3.2Kw spindle will be 8.8 per phase

Trick wiring, well it is not for everyone, so I only post about it when it is needed. at this point you don't have a need.

Motor name plate Amps or FLA x 1.732= the required input Amps for Single Phase Supply to 3 Phase, plus 125% for cable and Breaker size, you can work it out from this PDF

[rjwims]

I don't think your 3.2Kw spindle will be 8.8 per phase

Trick wiring, well it is not for everyone, so I only post about it when it is needed. at this point you don't have a need.

Motor name plate Amps or FLA x 1.732= the required input Amps for Single Phase Supply to 3 Phase, plus 125% for cable and Breaker size, you can work it out from this PDF

What do you figure my spindle will draw per phase, under 8? Manufacturer says that 120% of rated for 8 sec is max recommended.

Unless I push it hard, I don't think I'll ever see much over 20 amps in the single phase side.

3.2 kw @240 v (my supply voltage

3.2/.24 X1.25 = 16.7 amps

Distance from service to VFD is under 6 feet

[mactec54]

What do you figure my spindle will draw per phase, under 8? Manufacturer says that 120% of rated for 8 sec is max recommended.

Unless I push it hard, I don't think I'll ever see much over 20 amps in the single phase side.

3.2 kw @240 v (my supply voltage

3.2/.24 X1.25 = 16.7 amps

Distance from service to VFD is under 6 feet

If the name plate amps are 8.8A then it should be around 3A per phase

[rjwims]

It's as clear as mud.....lol

I'll get it eventually, I hope

thanks again, you are a wealth of knowledge