1 out of four new drivers acts different

[LUCKY13]

Hey guys, I just started doing bench testing with my system. I have one driver ( 320's) that acts totally different that the others. It acts none responsive with the gain & damp until I take it up to much higher settings. Then the motor does not run smooth. I just recieved a scope tonight so I will do more testing using it.


My question, does this sound like anything that comes to mind ? TO be honest I have not had the covers off and I am wandering about maybe jumper settings. The drive does work (basically) but it is odd in the way it does. I played the swap game and no matter how I swap things around (this motor that driver,ect,ect) the problem follows the one drive. I even swapped power,motor and encoder harness around so I am pretty sure I have identified the right source.


It will be tomarrow night before I get the system fired back up. I will try and get scope readings that might help identify whats going on. I am in no hurry, the mill is not ready to go to work or nothing. SO I have time to do any test that may be suggested. When I tune this drive , it just sets there like it does not have servo lock (no humming or clicking). But when I try to turn the servo shaft it does have lock. It takes turning both gain & damp upto about 3/4 of the way to get a hum out of the servo and then the motor still doesnt sound like the others. When I run it the movement is rough when changing direction. For some reason I keep thinking the jumpers are set defferent than the others by the way it acts but I dont know how defferent settings would make it act either, or what they are for. The green paper that came with the drives shows three jumpers. WHat possitions should these be in, the way the paper shows? I will check them tomarrow.



Thanks Jess