Received my G540 yesterday. In all my research it never turned up that a G540 cannot be used on a 4 axis machine using dual X axis stepper motors. I have an A axis in addition to X, Y and Z. Because of the width, the X axis has dual motors. I called Gecko to discuss the resistor issue and discovered that the G540 cannot drive a dual X axis machine. According to him, people use the A axis to drive a second X motor or they buy two G540s. He said the 2.8 amp draw of each motor would exceed the output of a single driver. LSS G540 cannot be used this way. Very disappointed that the G540 cannot be used in a similar fashion.
However, I currently use a single Chinese CW250 to drive both motors. I checked my CW250 and it is set up to output 1.5 amps which drives the dual KL23H286-20-8Bs quite well. If it works on the CW250, why not on the G540? Why can't two of these steppers look like a single motor to the G540? Use a single 2.8K resistor and they should look like a single stepper. They would actually have more available amps than they do now.
Anyone have any thoughts? Otherwise, anyone need a new, unused G540?