Jasondelane
Lifetime Supporting Member
We are running a high inertia load on a WEG CFW11 VFD.
The motor is 400HP, 60hz, 508 FLA(from memory), 598RPM.
The issue we're having is that the high inertia load is causing DC Bus Overvolts when the chipper is loaded and then unloaded.
The installers had the VFD setup on V/Hz mode. I changed it to Sensorless Vector and did a rotate tune. It seems to accelerate better now but I don't think that helped the issue with overvolts.
I also adjusted the Maximum negative torque value from the default 150% to 4%. This seems to have had the greatest improvement.
I noticed when the chipper is running unloaded it always runs -4% torque for some reason. You would think this would slow the chipper down but that seems to be the "idle adjustment" the VFD is making to maintain 600RPM.
The accel is 60 Sec, Decel is 360 Seconds. The VFD runs -4% torque during the decel also.
When I check the last fault snapshot it's usually around 470 amps (unloaded amps are around 280), 680 DC bus volts.
What are some other settings I can adjust to properly run this setup?
The motor is 400HP, 60hz, 508 FLA(from memory), 598RPM.
The issue we're having is that the high inertia load is causing DC Bus Overvolts when the chipper is loaded and then unloaded.
The installers had the VFD setup on V/Hz mode. I changed it to Sensorless Vector and did a rotate tune. It seems to accelerate better now but I don't think that helped the issue with overvolts.
I also adjusted the Maximum negative torque value from the default 150% to 4%. This seems to have had the greatest improvement.
I noticed when the chipper is running unloaded it always runs -4% torque for some reason. You would think this would slow the chipper down but that seems to be the "idle adjustment" the VFD is making to maintain 600RPM.
The accel is 60 Sec, Decel is 360 Seconds. The VFD runs -4% torque during the decel also.
When I check the last fault snapshot it's usually around 470 amps (unloaded amps are around 280), 680 DC bus volts.
What are some other settings I can adjust to properly run this setup?