I was surprised to learn of two different encoders to control the X axis. Since both output pulse signals indicating direction and feed rate, which one is being used for the primary signal train? The controller tells the motor to move at a certain rate and direction and an internal PID feedback loop adjusts the speed of the motor to make this happen. I don't see why they felt the need of a redundant encoder to pull this off? Errors can be detected and corrected with just one encoder in the system.

Why Carvewright chose to do this is a mystery and they only did it on the X axis from what I can see. I have not checked yet but with 4 wires out of the encoders I suspect they are quadrature encoders with an A and B output and probably run on 5 volts?

Inquiring minds need to be satisfied.

Brad