I have a Gecko G540 setup running Linux cnc (with steppers on the x, y, z). I plan to add a 4th rotary axis but given the size of my gear, I'd like to use a larger motor than what could be run from a g540.

I have some old 400 watt Yaskawa AC servo motors and drives that came with my linear actuators. They appear to take standard step / direction. Is it possible to take the step / direction signal from my G540 to run the AC servo (for just the 4th axis)? Obviously I would not take power through the g540 as the servo drive uses 240 ac. Essentially, I want to use the g540 as a breakout board for one axis.

So... Does anyone know if this is possible and safe?