You are correct. It is a very high 480-490 VAC and I am ordering filters right now. Should have had them before but wasn't my call. Thanks for the reply.
I have just been told by ABB that my motors could have been back-feeding after a failure and the drive faulted off. He thinks it back fed...
ABB has only one answer....send it in for analysis at my cost.(one year off warranty)and maybe find something.
I have been out of the loop on motor replacement, so I will have to say they are not inverter-duty motors. That needs to change, but I still don't see how that would cause a melt down...
Yes I am having problems with motor failure causing the drive to fail. The +UDC bus melts down and causes other damage when a motor fails due to insulation breakdown. The drive sees the motor as a dead short and melts the UDC bus instead of protecting itself via output ground fault enabled.
I...
I have 25hp fans running 50% of the time at 60 Hz, near FLA and RPM for the motor, given the fixed prop pitch and static pressure, and 50% of the time at about 30 Hz. I am using ABB vfd's rated @ 25Hp VT. Should this be a constant torque application?
Thanks for any input to clear this up.
