Problems with Lichuan LCDA357H drives (closed loop steppers)

Hi I am trying to setup a small router with LinuxCNC, Mesa5i25+7i76 cards and three Lichuan LCDA357H drives and LC57H380 3 phase motors with encoders.

I have them running as expected in open loop (switch 6 on) but they don't work in closed loop. There is a small movement and then a three flash error. (which the documentation doesn't cover but I am guessing is encoder related)

When I put the scope on the encoder inputs I just see 50hz line noise (a significant amount of it) I have everything on the machine ground with its own wire to a central point but the encoder wires do not appear to have a ground. I see the same noise if I check the mid cable connector in the encoder wires.

so far I am not impressed with these drives or motors based on the poor documentation alone.

does anyone have an idea of how to proceed?

thank you

Luke

I know it's been many years but I hope this can help someone. the tree flash error code is for missed steps. Your motor can be wired wrong as switching any two phase wires will result in backwards rotation and it will think it's loosing steps due to that. Not sure on other possible causes.

Check the wiring of your motor to the driver. this looks like a wiring fault.
Thick wires are UVW U=Yellow V=Brown W=Blue
Thin wires is encoder
1 Yellow = encoder ground connected to EGND on the driver
2 Red = encoder +5VCC connected to the VCC on the driver
3 Blue = encoder output EA- connected to the EA- on the driver
4 Green = encoder output EA+ connected to the EA+ on the driver
5 Black = encoder output EB- connected to the EB- on the driver
6 White = encoder output EB+ connected to the EB+ on the driver
With a scope you should connect the scope ground cable to encoder ground and look with the testpin on one of the outputs ( EA- etc ) it should give a rather nice square when the motor rotates