It was the 3rd failure in 900kw 6kV 4 pole induction motor, turning a fan in a steel plant. Originaly the closed damper starting dictates that the load starting characteristic is all below the 0.3 of nominal torque at nominal speed. Neverthless, the measured current at closed damper condition...
Dear All
quite often we see installations of VFDs without the line harmonics filters (i do not mean the line chokes), concequently meading to failures to nearby capacitor banks installations.
What would be the recommended retrofit as regarding the input "cleaning"?
