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I've run into a conundrum putting a VFD on my lathe which seems to fit this thread. My lathe has a go forward and go backwards lever near the apron. This activates, through a twisting rod, either a go forward or go backwards switch(s) near the head stock and control circuit. There is also a brake and latching switch plus a jogging switch. Now, one of the nice features of the VFD is a soft start, it ramps up to speed and avoids the large inrush current. If I just wire in the 3P power from the VFD this ramp up won't work. When energized the VFD ramps up to full speed but nothing will be connected. When a switch, such as go forward, is engaged it will draw an inrush current starting the motor.I'm just starting to find ways around this. One option is to wire around the control directly to the motor ...
Bill,Yes it is ProtoTrak MX2, the only problem with that I can see is that to save a program I have to save it onto a 3.5 inch floppy drive, I have two formatted discs. On a happy note the Supermax mill at work is 3 Phase and my boss is fine rewiring it to plug into both machines. Saves money for a vise I guess.Art