I am new to this forum and not a CNC person, but I am trying to wire a G251 to a PLC with stepper capabilities and for some reason it isn't working properly(at all). This is the first stepper project I have done so bear with my inexperience.
I have 2 drives in my project and one is from automation direct and I can make it function without a problem. It has built in optoisolation. I went through a fairchild H11L2 optoisolater to the gecko drive. The motor has holding torque, but wont move in either direction. When I hook up to the same plc outputs through the AD driver, it works fine. I am using a 5.1v wall wart for my opto power and I have a 24v and 2.2k resistor going to the input side of my opto. What kind of voltage readings should I be getting across the outputs? I get 3.4v across both step and direction when idle and when the plc sends a command it jumps to 3.8v. Would any of this have to do with my grounds? On the AD drive I am using the same power supply for the PLC and the motor power. On the gecko drive I have a 48v power supply for the motor and the same 24v power supply.
Can anyone offer any advice, suggestions, anything?
Thanks in advance
matt@skabrewing dot com