Below is a rant, and then I will get to the actual question. I am reposting this here to hopefully get wider exposure in order to either mitigate or confirm the issue.
I was duped with the Ebay listing for my VFD. When I asked the seller if it was a 1 phase compatible, he said yes, I didn't ask if it was de-rated for 1 phase.
So the model I have is the HY03D743B (or a knock-off, since it has no nameplate), which is 3.7KW (says 4KW on the front), but it is 3 phase. You can hook it to 1 phase, but the power drops to 2.2KW.
If you take in torque curve as well (based on 60Hz), at 200Hz, you are at 1/2 of the torque of the rated VFD, which takes it down to 1.1KW meaning I am pushing less than 2 hp to a 5 hp spindle.
I have a 4kw VFD, 5hp air-cooled spindle. The combination has been running well for over 2 years, but I have never really pushed it as far as I wanted (except on one occasion, which now I understand a lot more). It is a 8000-24000 rpm spindle. I have never noticed torque or power issues till this occasion, so this is a first. I did just do a factory reset on the VFD to get it to work with Mach 3 correctly, but all of the parameters were put back the way they originally were.
Running a new MLCS Katana .5” upcut bit at 12000 rpm, .375” depth of cut, 200ipm
Amperage at no load is 0.3 amps
As the spindle starts into the cut, the amperage increase at a rate of about 1 amp per second before the bit is stopped at 6.8 amps (max amperage on the spindle is 15 amps)
So it looks like the VFD is not sending enough amperage fast enough to get the spindle up to the appropriate horsepower before it bogs down.
Is there a parameter to change the amperage ramp time so that it does not bog down? I don't feel that running this bit at 15000 rpm would be safe, or I would try adjusting the speed up to see if that would help compensate.
I can run this file successfully if I drop the DOC down to .125 per pass, but it increases the machining time significantly.
Appreciate your thoughts and time.
I was duped with the Ebay listing for my VFD. When I asked the seller if it was a 1 phase compatible, he said yes, I didn't ask if it was de-rated for 1 phase.
So the model I have is the HY03D743B (or a knock-off, since it has no nameplate), which is 3.7KW (says 4KW on the front), but it is 3 phase. You can hook it to 1 phase, but the power drops to 2.2KW.
If you take in torque curve as well (based on 60Hz), at 200Hz, you are at 1/2 of the torque of the rated VFD, which takes it down to 1.1KW meaning I am pushing less than 2 hp to a 5 hp spindle.
I have a 4kw VFD, 5hp air-cooled spindle. The combination has been running well for over 2 years, but I have never really pushed it as far as I wanted (except on one occasion, which now I understand a lot more). It is a 8000-24000 rpm spindle. I have never noticed torque or power issues till this occasion, so this is a first. I did just do a factory reset on the VFD to get it to work with Mach 3 correctly, but all of the parameters were put back the way they originally were.
Running a new MLCS Katana .5” upcut bit at 12000 rpm, .375” depth of cut, 200ipm
Amperage at no load is 0.3 amps
As the spindle starts into the cut, the amperage increase at a rate of about 1 amp per second before the bit is stopped at 6.8 amps (max amperage on the spindle is 15 amps)
So it looks like the VFD is not sending enough amperage fast enough to get the spindle up to the appropriate horsepower before it bogs down.
Is there a parameter to change the amperage ramp time so that it does not bog down? I don't feel that running this bit at 15000 rpm would be safe, or I would try adjusting the speed up to see if that would help compensate.
I can run this file successfully if I drop the DOC down to .125 per pass, but it increases the machining time significantly.
Appreciate your thoughts and time.