Quote Originally Posted by Voicecoil View Post
Looking inside I can see a little white (hence likely an opto) 4 pin device adjacent the pins, but like most SMD's it doesn't have the device number, just some cryptic code on it

24V/20ma is a good guess, but there's still the issue of what does it indicate....
Something wrong?

I'd guess it'll depend on all what the driver is capable off, and what settings can be changed via software.
Motor/wiring problem (does the drive sense motor wiring issues?), motor following error (there's a parameter for it...).
Have you got a copy of the 'simple commissioning manual' that's mentioned below the parameter table?