Hi all
Good news that the system is now operating, at least at some level.
I am a bit concerned that we are still unsure that the amp and motor are working to specification. The forward gain does seem rather low suggesting the amp or motor may be at fault in some way. The motor can possibly be verified by substitution. We can try adjusting RV4 but ideally need a signal generator and scope to do so. But I think it could be done via the CSMIO scope and I think we could generate the velocity steps via Mach or CSMIO if we use Vff and set all other PID coefficients to zero to eliminate any feedback within the position loop, as this would detract from optimising the amp's velocity loop. Does anyone out there agree with this or have any alternative ideas; or does the system seem responsive enough as it is?
If the velocity loop is too limited in bandwidh, or is Poorly damped, we may have difficulty tuning the position loop, or the overall dynamics may be rather limited. The Kv Mick has achieved seems low to me - when I was using v2.910, admittedly with Mach4, Kv was typically over 100000.
Mick
Thanks for the more detailed explanation of how you have reconnected the encoder and analogue output. I was struggling to see how it could work with the encoder on one axis and the analogue output on another. Haven't personally had any hardware faults but I suppose it is possible. Which axis is the motor on?
Craig
Sure, technology continues to advance, but it will be some time before these changes become common practice in the home shop. Heck, many users still cling to Mach3 despite the superiority of Mach4. They have a system that does what they ask, and that is all they need or desire. Anyway, we need to get back on topic.
Allan