Quote Originally Posted by TonyD View Post
I couldnt reproduce the fault until a few mins ago when I noticed that one of the 882's went into an error state and stopped the motor with 4 blinks which per the manual is 'phase error protection' (short/break).
Now arent you pleased you bought good quality drives because lesser drives would have let out the magic smoke when a phase wire falls out of bounces.!!

Now the missed steps concern me because while a loose connection could cause loss of position it wouldn't loose 2-4mm just jogging around, which by the way isn't a small amount when your talking several hundred MS steps per mm.

I would check that the SS frequency is same for Each Axis and it's not set to some silly high setting. 128Khz is more than enough.

Also do you have a Cable to connect to AM882 drives and use the protune software.? If not then get one for the sake of £2 worth every penny.
Check that each drive is set exactly the same with regards microstepping and Amp's. Protune as a Quirk in that it will some times default the Amp settings back to default which is around 2A, so check it hasn't done this on one of the drives.

Makes sure the Motor tuning and steps Per in Mach is exactly the same for both slaved Axis. Don't set high feed or Acceleration until your sure machines mechanicly fine and no binding Etc. Even then be careful not to go daft with Accel which is the biggest cause of lost steps.
What are your Motor tuning settings now.?