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Connecting VFD + 3 phase motor on King PDM-30

Susquatch said:
Well Done!!!

This smoothness, low vibration, torque, and accell/decell thing that results from using a VFD is something you just have to experience to appreciate. I often mention it, but I don't think anybody reading my words can really appreciate the improvement until they experience it themselves. It's sorta like swapping motors from a sump pump to a sewing machine, or a clapped out Briggs to a Honda.

Did you implement SLV mode yet? If not, prepare for yet another huge improvement in those same qualities.
Click to expand...

Thanks Susquatch!!
Btw, What is the SLV mode?
 
RickyD said:
Thanks Susquatch!!
Btw, What is the SLV mode?
Click to expand...

Sensor Less Vector. The VFD measures the running current and back EMF to calculate its exact rotational position without sensors and adjusts the output accordingly. So it can hold a given rpm despite variations in slip/load. Amazing!
 
Susquatch said:
Sensor Less Vector. The VFD measures the running current and back EMF to calculate its exact rotational position without sensors and adjusts the output accordingly. So it can hold a given rpm despite variations in slip/load. Amazing!
Click to expand...
Interesting!!!
Will look into that... hope it supports that mode.

Thanks
 
Susquatch said:
Sensor Less Vector. The VFD measures the running current and back EMF to calculate its exact rotational position without sensors and adjusts the output accordingly. So it can hold a given rpm despite variations in slip/load. Amazing!
Click to expand...

Looks like on my VFD (KBDA-27D) it is called Flux Vector Compensation, it is in % from 0.0% to 10.0% and default to 5.0%, it is sufficient?
There are also a few functions that I am not sure about, but looks useful, in can someone can explain:
- Switching Frequency (kHz) / can set to 8, 10 or 12 and default to 8
- Boost Value (%) from 0% to 28% defaul;t to 7%
- Stop Mode, can be: Regenerate-to-Stop (default), Coast-to-Stop or Regeneration with Injection Brake-to-Stop (Set by Function Nos. 1.11 – 1.13)

I have attach the summary of functions avail on my VFD.

BTW, should I allow my VFD and motor to run over 60hz for higher RPM ? (Currently 60hz provides approx 1800 rpm), and currently the VFD it is set to max 60hz, but I can change that to higher, up to 240hz!!!

I'm quite new to all that, thanks for all the help and explanation. My VFD user manual list all the functions, but does not say much about what they do.
 

Attachments

RickyD said:
Looks like on my VFD (KBDA-27D) it is called Flux Vector Compensation, it is in % from 0.0% to 10.0% and default to 5.0%, it is sufficient?
There are also a few functions that I am not sure about, but looks useful, in can someone can explain:
- Switching Frequency (kHz) / can set to 8, 10 or 12 and default to 8
- Boost Value (%) from 0% to 28% defaul;t to 7%
- Stop Mode, can be: Regenerate-to-Stop (default), Coast-to-Stop or Regeneration with Injection Brake-to-Stop (Set by Function Nos. 1.11 – 1.13)

I have attach the summary of functions avail on my VFD.

BTW, should I allow my VFD and motor to run over 60hz for higher RPM ? (Currently 60hz provides approx 1800 rpm), and currently the VFD it is set to max 60hz, but I can change that to higher, up to 240hz!!!

I'm quite new to all that, thanks for all the help and explanation. My VFD user manual list all the functions, but does not say much about what they do.
Click to expand...
If I recall correctly I ran my 3-phase RF clone up to 75 Hz. I think I put the belts on a lower speed combination for the torque multiplication when I ran less than 60 Hz and overspeeding the motor still gave me good top end spindle speed.
 
RickyD said:
Looks like on my VFD (KBDA-27D) it is called Flux Vector Compensation, it is in % from 0.0% to 10.0% and default to 5.0%, it is sufficient?
Click to expand...

I'm not familiar with that. Mine are all on or off. @BaitMaster?

RickyD said:
There are also a few functions that I am not sure about, but looks useful, in can someone can explain:
- Switching Frequency (kHz) / can set to 8, 10 or 12 and default to 8
Click to expand...

Set it to the lowest value you can't hear. It's the switching frequency. For those with high frequency hearing, it can sound like it's screaming at you. I can't hear anything that high, but I do hear infrasounds well below 20 Hz (the lower limit for most people).

RickyD said:
- Boost Value (%) from 0% to 28% defaul;t to 7%
Click to expand...

Not sure what this is either.

RickyD said:
- Stop Mode, can be: Regenerate-to-Stop (default), Coast-to-Stop or Regeneration with Injection Brake-to-Stop (Set by Function Nos. 1.11 – 1.13)
Click to expand...

No good reason not to use regen or injection unless its too fast which really applies more to lathes than to mills. You don't want to stop or accelerate a lathe too quickly.

RickyD said:
I have attach the summary of functions avail on my VFD.

BTW, should I allow my VFD and motor to run over 60hz for higher RPM ? (Currently 60hz provides approx 1800 rpm), and currently the VFD it is set to max 60hz, but I can change that to higher, up to 240hz!!!
Click to expand...

This depends on your motor. For non VFD motors I wouldnt go above 75hz for fear of destroying my bearings. If it's a high quality motor, then 90. Some motors are rated for 120.

At the bottom end, the average motor is ok to 45hz. Better motors can go to 40. But 40 and lower usually requires a cooling fan. With an add-on fan 30 is fine. Some VFD rated motors can go all the way to zero. Most VFD rated motors can go to 6 rpm. In the absence of good reliable info on the motor ratings, I'd stick with plus/minus 25% ie 45 to 75. Others might disagree.

RickyD said:
I'm quite new to all that, thanks for all the help and explanation. My VFD user manual list all the functions, but does not say much about what they do.
Click to expand...

Those manuals suck.
 
Susquatch said:
I'm not familiar with that. Mine are all on or off. @BaitMaster?



Set it to the lowest value you can't hear. It's the switching frequency. For those with high frequency hearing, it can sound like it's screaming at you. I can't hear anything that high, but I do hear infrasounds well below 20 Hz (the lower limit for most people).



Not sure what this is either.



No good reason not to use regen or injection unless its too fast which really applies more to lathes than to mills. You don't want to stop or accelerate a lathe too quickly.



This depends on your motor. For non VFD motors I wouldnt go above 75hz for fear of destroying my bearings. If it's a high quality motor, then 90. Some motors are rated for 120.

At the bottom end, the average motor is ok to 45hz. Better motors can go to 40. But 40 and lower usually requires a cooling fan. With an add-on fan 30 is fine. Some VFD rated motors can go all the way to zero. Most VFD rated motors can go to 6 rpm. In the absence of good reliable info on the motor ratings, I'd stick with plus/minus 25% ie 45 to 75. Others might disagree.



Those manuals suck.
Click to expand...

Thanks Again !!

BTW, the motor is an "Inverter Duty", I believe high quality motor.

IMG_5052.jpg
 
RickyD said:
BTW, the motor is an "Inverter Duty", I believe high quality motor.
Click to expand...

Looking at your motor plate, it's a very good motor.

You can run full torque at 12Hz
And 66% of full torque at 4hz

You lose the ability to achieve full torque even for short times at 3hz.

HOWEVER - These are extremes. I don't recommend running below the constant duty rating at 12hz so I'd suggest a minimum of 15. That's still an amazing range! I didn't see high speed ratings on the label but you might be able to get them from the motor manufacturer. Although I'd bet you are safe at 90hz, I'd still suggest 75 and maybe more for short times.

That gives you a function speed range of 5:1 without using any gears!

Remember that you lose HP as you go down the speed range from 60hz and lose Torque as you go up. Its not a good idea to push your machine too much. If you choose a gear that give you the machines max rpm at 75hz, you can probably use the machine while rarely changing gears. Except perhaps to add some grunt at low rpm.

Ya, nice motor!
 
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