Problem with slaved axis

[MK_CATANZARO]

So I've been cutting with my Mechmate for a few years now and everything has been going great. Then last week without any warning, the slaved x(a) motor has started frequently (bot not always) going in the wrong direction. This causes the gantry to twist and jump off the rails. There are no error lights on the gecko 203v. The pmdx 122 is showing the correct lights on the direction output. My motor is the pk296a2asg7.2. Has anyone seen this before? Any suggestions before I start replacing parts?

All of my wires are still tightly connected. Nothing has been changed. One day, I turned it off and the next time I turned it on, this happened.

I have pulled the gantry to get a good look and listen to the motors. The problem motor is occasionally functioning and sounding good. Sometimes it hums loudly as it binds. Sometimes it makes a gravelly sound as it runs in the wrong direction.

Any advice would be much appreciated.

Thanks,
Mike

[ger21]

Jog back and forth, and measure the direction pin voltage at the gecko while jogging in both directions.

[smreish]

Yep,
It's happened to me before. I had to reinstall Mach. But, before you do, try this....it sometimes works.

Go into the configuration, then motor tuning where you can adjust the speed curve ( trapezoidal profile). Move the slider for each axis just a bit and save before touching each axis. By just moving, thus resetting the motor configuration, it has restored my x1-x2 axis config at least 3 times it has happened. Something with the memory bits gets outta whack.

Try it....it worked for me.

[MK_CATANZARO]

Thanks Guys, I'll check booth of those ideas against it and see what happens. I'll let you all know if it starts behaving.

[danilom]

Check or clean contacts from drives to motor wires, this has been mentioned couple of times I think.