Hello,
I am currently in the final stages of building my 5x10 pro machine running centroid control with the new EX box, and a CNC depot ATC spindle kit with a Simphoenix E550 VFD.
I am having a problem with the analog signal between the EX box and the VFD. With the 14 pin cable disconnected I am seeing the correct voltage between the analog output from the EX box (5v at 12k rpm for example). As soon as I connect the 14 pin cable I read about 1.7v from the analog wires when I am expecting 5v for 50% spindle speed.
I have tested each component individually and I know that I have a good VFD and a proper analog signal coming from the EX box. I can only replicate the issue by connecting the EX box to my VFD.
I have also ran shielded cable externally, bypassing the 14 pin cable and any connections all together and I still have the same issue.
My current thought of where to go next is verify that the current supplied from the EX box is within the correct range for my VFD, but I cannot find info on the specs of the Acorn boards analog output. If anyone has had similar issues or any ideas of what to try next I’d greatly appreciate it!
This is how I have it currently connected except my VFD does not have a separate common for the analog input, just a ground. The configuration of my VFD worked as I have it connected now when I tested it using an external power supply. I am getting the expected voltage from the AN GND and AN OUT pins at any rpm but once connected to the VFD the voltage is inconsistent and far lower. I was able to run the spindle (still wrong rpm but a different wrong than before) with just the 0-10 AN wire and no ground hooked up. Not sure if this is expected or not but I figured I’d throw it out there.
I also occasionally get an over current fault on my VFD during startup or shutdown of the spindle so I am wondering if my voltage drop is being compensated by a higher current to keep the wattage the same.
I’ve been working through all of this with Gary Campbell just to give more context.