An Alvitar ATV312 VFD I acquired requires a cosφ entry in the motor specs setup. My motor does not give a value for that. So not having any idea what it is, I Google for a way to calculate it. I never found anything I understood, but I did find some ranges for different 230V 3 phase motors, which I have. For 2HP it was .81 or .84.
So I enter all the values and the drive functions as normal, but the motor is making some strange rumbling noises, as well as what sounds like bad bearings. Odd because the motor has 5-10 hours use since I acquired it new.
I haven't used the lathe a in long time, and I'm really confused by this, so I tear the motor apart. I found nothing wrong with it. I hook the WEG VFD that was on it back up and the motor sounded fine.
I hook the Alvitar back up and start changing motor value settings at random. No improvement. The last setting is cosφ. The value range is .50 to 1.00. First value I try 1.00. The motor ran perfect. Problem solved.
My question: Is there an explanation for what cosφ is that someone with little knowledge about electronics can understand? And why was the wrong setting causing the motor noises?
So I enter all the values and the drive functions as normal, but the motor is making some strange rumbling noises, as well as what sounds like bad bearings. Odd because the motor has 5-10 hours use since I acquired it new.
I haven't used the lathe a in long time, and I'm really confused by this, so I tear the motor apart. I found nothing wrong with it. I hook the WEG VFD that was on it back up and the motor sounded fine.
I hook the Alvitar back up and start changing motor value settings at random. No improvement. The last setting is cosφ. The value range is .50 to 1.00. First value I try 1.00. The motor ran perfect. Problem solved.
My question: Is there an explanation for what cosφ is that someone with little knowledge about electronics can understand? And why was the wrong setting causing the motor noises?