It’s time to get our hands dirty, PC and cards are here.
And at the same time, realized that I still have more questions than answers...
Question A.
The PC is a HP-8200 (I3/4Gb/250SSD/DVD), loading live LinuxCnC from a (pretty old) usb stick got a 65K on Max Jitter (ns) on the Servo thread (1ms), I have to confess that I have tried to open up everything that I could (youtube 4K, glxgearsX3, browsing wallpapers) which in normal operation nothing like this will ever happen . I still haven’t cleared all things in BIOS, not installed anything on the SSD, but I’m not really sure if this PC will actually work on this. I’m a bit confused of what should be my Max Jitter when it comes to control servos? Is there a specific number that I should be looking to be lower than?
Question B.
The PC will be about 4m far away from the 7i92m, the 7i77 will connect directly to the 7i92m (Ethernet). Placing a 7i77Isol in between them will have any effect? (Don’t know why but I had one ordered before asking this question and wondering whether I should use it or not)
Question C.
As my biggest concerns are the encoders, I forgot the list of the i/o and started with them… At the existing machine the “control relay panel” has 3 connectors (X,Y, and Z) “From encoders”, opened up one and found 7 cables… (I could say without really knowing that 6 cables are A/A, B/B, Z/Z, what is the 7th?) I’m trying to figure out which ones I have to connect to the 7i77, any help is appreciated, photos are attached (wiring diagram, connector photo).Edit:… Rewriting my query, I’m most probably missing combined information how servos are controlled through the 7i77, or how the “loop” is controlled and closed with or within the Yaskawa servopacks…
Beware that coming from a stepper motor system, still trying to close the loop in my head first how things should be working… Reading around, I have seen that there are several “modes” for configuring the machine, most probably I should be looking to get “velocity mode” instead of “position mode” but don’t know their differences (also there is “torque mode”?). Could someone point me to a direction where to look?
@smc.collins -> All diagrams have been scanned, unfortunately my phone wasn’t doing the job right, so scanned everything from photos. Let me know how I could post/send them to you (due to size of these drawings and for being able to read them total pdf size is about 240Mb).
