I'm in UK and have recently converted my lathe to variable speed by changing the motor to 3ph and installing a Mitsubishi FR-E520S-1.5K-EC inverter running from a 1ph 240v supply. The motor is a new Teco 2HP unit, but the inverter was second hand. For the first month or so, everything was fine but, out of the blue (as it were), the inverter has been throwing out E.OV3, and sometimes, E.OV2 errors. The errors are not encountered every time the lathe is used, but often enough to be really worrying. It happens even under no-load, ie. the chuck is turning but there is no metal cutting at all. Originally, the inverter fan would switch on only when the motor was turning, but since the error conditions started, the fan is on whenever the inverter is powered. Any one got any ideas about this please? Could it be a problem with the motor?
13 years ago