I bought a cnc 3040 and i have a problem with the vfd prt-e750w, i can't adjust the spindle speed

when I press the F5 button in Mach3 software, the spindle only starts a low speed and stop, if I set a lower or higher speed it does not change anything
does anyone have the same problem or know how to solve it ?
someone has the user manual of the vfd prt-e750w
thanks very much

Similar Threads: