Strange. I have this kind of drive, and I didn't have any problems with it, although I didn't run it for long. Actually, when you buy it, it's initially sold as either closed-loop or open-loop, and the seller asked me about it when I purchased it. Well, I immediately chose the closed-loop one.
Yes I have its big brother ECT86 running perfectly. I am sure I had this running in testing with no load but lost the config. I think my manual XML has been used by most people on these drives. Pretty sure its found its way into ScottLairds linuxcnc-ethercat driver too.
@besriworld, I was hoping you had nailed it, but not to be. Being a plasma guy, I forget about inertia! I tried disconnecting the drive and see if it runs with no load but its no better.
The fault is "Joint 1 amplifier fault"
@tommy, this ethercat drive looks after the encoder connection. I can see the DRO moving when I twist the shaft so its OK. It has automatic tuning by default and the motor and drive are a matched pair. It can be set manually, but I don't think I need to go there.
Thanks everyone for their ideas. I am still none the wiser. From memory, there is an internal error register I might publish a pin for and review.
