B&M Welding Inc. (Customer) asked a question.
Need help tuning a GS33-2015 VFD for a milling machine spindle motor.
I have an induction motor, I will attach the nameplate. I am having trouble tuning the VFD to drive it. I want to use IMFOC mode to get my motor parameters then switch it to IMFOCPG mode to set up Single Point Positioning.
Can someone suggest NP parameters for this motor, based on the picture? I can find zero information on the HZ and # of poles, so what do I start with?
Does it have Brushes?.. Or Slip Rings?..
How many Wires going into it?..
I'm trying to understand the Wiring Configuration..
I'm not thinking it's an Induction/Repulsion motor.. But I'm trying to understand the 'Not Synchronous' RPM and how it was achieved before you got it..
What was driving it..
Cap
Is this a servo motor? If so, you would need a servo motor drive to control this motor. I suggest that this could be a servo motor because of the nameplate speeds (9000 RPM/12000 RPM Max) and the sticker (Siemens Motion Control Systems). And the missing Hz rating, (and other ratings) which would be required for a standard AC motor.
To the best of my knowledge there are no brushes. It is not a servo, although it originally had a resolver on it, that I changed to a 2000 line encoder.
It has 4 wires, L1, L2, L3 and Ground.
Runs perfectly in V/F mode, using 60Hz, 220V, 4Pole, 5.5KW, 40 Amp., 1710RPM.
I can run it right up to 9000 RPM and runs very smooth. Acc. and Dec. set to 4 sec., the Amp draw is right in spec.
Should I use 60Hz for for IMFOC mode as well? I can't seem to get any smooth tuning in any of the FOC modes. I will try again this afternoon and see if I can get you some numbers.
Thanks for your input so far! I appreciate it!
Back to motor tuning.
I reset the drive. Entered the following motor information. 60Hz, 220V, 40Amp,5.5KW, 1710 rated Rpm, 4 pole, 275HZ max.
Set to V/F mode, it runs to my expectations. Acc. and Dec. set to 4 sec. I can take it up to 8,000 RPM and to 0 with no issues, smooth and quiet. The highest Amps I see is 22.6.
When I switch it to IMFOC mode I can no longer do the hard acceleration. The amps spike and I get a ocA alarm almost immediately.
I tried to work through the motor adjustment procedure for IMFOC mode, after the Motor auto tuning I can carefully speed up and slow down the motor and it is pretty smooth, but when I try to do the inertia estimation it throws a eol1 error. What do I need to adjust to get passed the inertia estimation?
Try adjusting your carrier frequency. When I used to work with high speed spindle motors years ago (over 20 years ago) I used to have to increase the carrier frequency to make it work. Drives have advanced a lot since then, but you may have to still do something like this.
Thanks for your suggestion. At this point I have full control from the CNCPC using IMFOCPG mode!!
Using a suggestion from someone on another forum, I adjusted the rated amps to 22 instead of full stall amps rating of 40. This lets me set the Acc. and Dec. time both to 3 sec. and it works pretty good.
I just used the table in the manual and set my inertia estimation to 26, and that seems to work pretty good. Will I need to adjust that again when I hook the spindle belts up? The spindle is not large, but it will add some weight.
Now I am moving on to the single point positioning, is there any videos or documentation for that?
I had a pretty good day tuning this drive. I am pretty happy with where I have it.
The my biggest issue now is with the single point positioning. When I activate input #35. It goes into an erratic back and forth motion then the drive disables at high rpm’s and throws an error “opE”
The fine folks at Centroid are able to duplicate the issue on there test unit as well.
Can someone from AD help us with this?