VFD on 4 speed 2 winding motor help
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  1. #1
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    Default VFD on 4 speed 2 winding motor help

    I recently purchased an old JA Fay & Egan 400 lathe that I am trying to get back working. It has a 4 speed 2 winding motor with 14 leads going to a drum switch.

    My question is how would I wire it to a VFD. From doing alotbof reading on this forum as well as looking at the schematic that I could wire it to the higher speed winding and adjust the frequency down to slow the motor.

    I did attempt to use a static phase converter wired to the original cutler hammer starter but it trips the overload circuit on the starter after about 20 or 30 seconds of run time.

    Any thoughts on the best way to approach this set up? I have provided some attachments below to help answer questions.
    Attached Thumbnails Attached Thumbnails 20190222_124832.jpg   20190308_112537.jpg   20190308_174217.jpg   20190302_161106.jpg  

  2. #2
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    Hi Jay-

    Okay, so, the easiest way, if you KNOW that the switch wiring is correct... is to put the switch handle in one position, and remove the knob (lock it in that speed), then connect the VFD to your switch's power input... and put a switchbox on the headstock with F-Stop-R switch and a potentiometer (knob) for speed control. Set the VFD to run from say... 5hz to 120hz, and try it... and if you find that it's not fast enough, shut the VFD off, reinstall the original speed selector, shift to the next-higher speed configuration, then remove knob, and try VFD again. You'll find that at one given lever speed, the VFD gives you gives you what you need for most of your operations.

    BTW... I'd probably also put a foot-pedal in the wiring, and program the VFD for dynamic braking... so that when you're whirling a part and step away, it brings it to an expedient stop.


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