First of all, sorry for my english. I hope will be enough to explain the trouble and solve it
I bought the board, I followed the instructions on reprap site to connect to RAMPS throughout aux2 port. The board is recognized and I can control the extruders.
Unfortunately, when I give the extrusion command the motor runs, it emits sounds but in fact unable to perform any step.
I have read several threads on this forum, but I can not solve the problem.viewtopic.php?f=6&t=1975viewtopic.php?f=15&t=4931
About the setting of Vref I followed the above thread about the mainboard but also with allegro driver. Having 1.33A motors I started from 0.8v (used in the discussion to provide 660mA to the engines, I increased slowly to the limit (1.6v to 1.32A, always following the istruction of the discussions above) but the motors, despite the zero load, do not move and seem to lose steps. To read the VREF I put the red on knob and black on a gnd of the EB.
I did not consider the setting of step (1/1 1/4 1/8 ect ..), I come from Pololu and is the first time I work with integrated drivers. How can I adjust?
There 's something I do not consider? The motors are connected with the pin 1 of the wire to the pin 1 of the board motor's connetor, it is indicated by a square instead of the circles as in this picture?
( however Also reversing the cable I get the same result, I have perhaps reversing only a few pins?)
Finding the same defect on E1 of ramps, after changing drivers I thought of a damage of the board, which is why I bought the extrudrborad. But now I have the same problem: the motors are not moving.