Wiring help with CL57Y stepper driver

[MarkT]

@ribbonman

There is no acceleration, this is the constant speed example from the library to establish movement.

There's your problem, you need to ramp up and down the speed with a stepper, otherwise it will simply stall as it has to obey the laws of physics (it has inertia - especially true of a large stepper).

How much microstepping are you using?