Can you post some information (like a datasheet or product page link) for your power supply and explain how you determined that it is not keeping up with your load? If it is an adjustable supply, could you try setting the output voltage higher to see if that changes your results?
The Tic’s current limit controls how much current each phase of the connected stepper motor can draw. What that means for your power supply though is a little more complicated since you have to factor in your supply voltage. You can find more information in the “Choosing the power supply, Tic, and stepper motor” section of the Tic user’s guide, specifically under point 5 near the end of the section.
Hello Patrick
Thank you for your answer
In the meantime I understood my problem.
Indeed the limit of 175ma was respected by the tic.
What was wrong was the electrical wires between the power supply and my project about 2 meters of too small cable which in addition was rolled up by making loops and in addition the electrical cable of the serial port was rolled up with it.
Probably from a few amps consumed a magnetic field was formed and caused interference in the serial port cable.
I solved the problem by putting bigger cables and separating them well.
Thank you for the support