I have never tried this, so I can only assume what will happen. I think I remember reading in the Super-PID manual that the slowest the system can drive the router is 5000 RPM. Based on that, I would figure that a flat-line PWM input from the computer would result in driving the router at 5000RPM.
Yes, I de-soldered the pads on the back to connect it, and the RPM input, to the same switch. This way, when the switch is in PC mode, it is in linear mode AND the speed input is connected to the PWM signal; when it is in manual mode, the Super-PID is in K-mode and the speed input is connected to the POT. I have not tried to switch the control mode in the middle of a Super-PID power session. If I know I am going to run a job manually, I have all the switches set correctly, and the SO3 is powered on, before I turn on the Super-PID (using my wall switch). You will have to ask the Super-PID makers if they read the mode switch real-time or just on power up.
Actually, the Super-PID appears to have it’s own soft start feature. If I have the POT set to 18000 RPM, the router gets up to speed in 2 audible steps. I haven’t paid attention to what the initial speed is, but on startup, it reaches that initial speed in ~1-2 seconds, before it is ramped up to the set speed.
In all honesty, I haven’t really used the full capability of the Super-PID yet. My SO3 spent almost its entire first year taken apart, as I added one upgrade after another. I am just now getting into cutting wood; I hope to get into plexiglass and aluminum later. I would expect to use the Super-PID features more then, and I would expect to have a “wish I would have done differently” list then as well.
Please report back here when you are done. I’d love to hear how you fared and what you like/dislike.