I just put together a Kossel XL but can not get it to work due to a problem with the Stepper Motors; When I press home the motors make a lot of sounds but there is no movement.
I first thought that I might have damaged the polulo stepper boards, so I bought new ones, with the same results.
I have also tried to replace the Arduino board and the RAMPS1.4, with same results.
The voltage from the power supply is 12V and 5 Amp, and I have measured that it is correct.
Then I have tried to adjust the Vref on the Polulo steppers by turning the potentiometer 1/6 steps in either direction. Lowering the voltage seem to cause the motors to move a little 1/4 turn, but that is it.
I have tried to connect the excruder stepper instead of one of the three steppers on X,Y,Z with same result.
I have tried to change the parameters for the stepper motors in the Marlin software, no change.
Any suggestions?