I have procured a small vertical\horizontal knee mill. The vertical and horizontal spindles are powered by 3hp 3ph motors and I have a pair of Hitachi WJ200’s to power them.
As a side note I like the SJ200 that I have on my drill press more than the WJ200 simply because the SJ200 had a removable display and it was easy to put the VFD one place and the display and controls someplace else. Not so with the new, improved WJ200. But I digress.
The mill has a small 3ph coolant pump … motor plate does not give a HP but it does list 240V, .38A and 40W so well under a 1/4 HP … and a X axis power feed that is listed as 240V, 1.5A, .5HP. Finding replacement single phase motors is not a viable option at this point so phase conversion will be required.
Given the application neither needs to be a variable frequency drive. A Fixed Frequency Drive would be totally adequate as long as (a) the motor can be turned on and off, (b) in the case of the X axis power feed it can be reversed and (c) both can be controlled remotely.
I have thought about a static solution but I would prefer an electronic solution, especially for the X axis power feed.
At the moment the primary goal is for an inexpensive solution so alternative suggestions or a source for two “Really Cheap yet Reliable” VFD’s or FFD … is such a thing even exists … would be a big help.
Mike (at) KilroyWasHere (dot) com -- servo/spindle/vfd motors/drives/controls sales/service/repair/retrofit