Short version: could I get some advice on tuning a G320 (not the newer G320X), without an oscilloscope?
(Very) long version...
I have a 3 axis machine, running 24VDC, 60W, servo motors, US Digital E5S-250-250 encoders, and Gecko G320 servo drives.
I have a fourth G320, and I've recently realised the control box for my machine has the ability to run a fourth axis, so I want to use that fourth G320 with an additional motor and encoder.
That fourth G320 (and one of the other existing three) went back to Geckodrive in 2015 as I thought they were faulty, but they were returned with a clean bill of health.
To test the extra G320 before I drop cash on a fourth motor, I've simply swapped the connector block from the G320 controlling my Z axis onto that "new" G320, and set the limit, damp, and gain pots to match. And... it doesn't work.
Basically, I get the same problem I first had with this G320 drive - any movement of the axis will almost immediately trip the drive out (showing the fault light). Having dropped the axis acceleration in Mach down a ludicrously low setting (approx 2 inches per second per second), I can jog the axis up and down for a while, but it'll still sometimes fault. Also, when left alone, the motor will sometimes oscillate back and forth, slowly judder in one direction, or be still but then suddenly "jump" a short distance and then fault out again.
From previous experience I know the fault will follow the G320; it's not related to the machine axis.
I've also tried adjusting the damp and gain pots, but with no success. So... how do I move forward from here?
If it would be of any help I could maybe try to provide some videos of the behaviour?