I’m pretty sure I have a bad ESC (ESC1). After completing my build I realized that my unit pulls to the left (pushes to the left may be more accurate) and has a real tough time turning right. I’ve ohm’d out the motor windings and from winding-to-winding I get about .56 ohms. I checked for shorts between motors and those all measure open. I put a scope on the A, B, and C outputs of ESC 1 and I see a good pulse out of ESC A and C, but B is a terribly round hump, kind of erratic. I also notice when the ROV starts up ESC 2 and 3 beep right away, ESC 1 follows a few seconds after. Looks like this:
I also notice when I use a gamepad and give some light throttle, the motor chatters until I push the throttle enough. Looks like this:
Here’s a shot of the scope on ESC1-A
Here’s a shot of the scope on ESC1-B
I’d like someone to confirm that I haven’t overlooked anything else before I order a replacement ESC. Any thoughts or suggestions would be great!
If not, I’ll order a replacement ESC. I see some threads when I searched that mention calibration. For the ESC’s used on the OpenROV 2.7, Afro 12’s…do they need calibration? I can’t find any reference to cal. Or I can just replace the bad one with a new one and it should work?
Thanks for your help,