I am using and SMC03A to control a 12V linear actuator with a potentiometer to give 0-5V feedback.
If I make a large change in demand (i.e. from one extreme of the actuator to the other), the red LED shows, but there is no movement at all.
If I make more gradual changes in demand (i.e. 3 or 4 steps along the travel) it appears to be fine.
I don't believe I'm exceeding the 3A rating (actuator has been measured at 1.5-2A), and the board does not appear to be getting hot.
Is there a current limit that can "stall" the controller in these circumstances?
In case it's relevant, I'm using an RC signal as demand input. I've seen the same behaviour using serial input as well.