[jjacstcy]

Mach can't remember what way to go. I will get everything moving in the right direction, then run a simulation program and ref all to home but my machine moves away from home instead of coming back. I will go in and change the direction in the homing and limits page to get it to move the right way and run another simulation and rehome and it does the same thing. It switches the movement direction anytime a limit switch is tripped. Any thoughts?

[ger21]

Check the voltage on your direction pins when jogging back and forth. It should be 0V in one direction, and 5V in the other.

You might also try increasing the dir pulse width in motor tuning. Try 5-15 and see if that makes any difference.

But my bet is on the voltage at the pin.

[jjacstcy]

Where do I find the pins that I need to check? On the output of the gecko? Thanks

[tommylight]

Also use shielded cable for home and limit switches, i know for sure that can cause erratic behavior of the machine.
Regards

[ger21]

Where do I find the pins that I need to check? On the output of the gecko? Thanks

At the parallel port. If you're using a G540, you'll need to unplug the parallel port cable and check at the cable, or at the PC.

[jjacstcy]

I need to check pin 3 5 and 7 correct?
Thanks Gerry

[ger21]

If that's how you set it up. Make sure you jog the appropriate axis for each pin while checking.

[jjacstcy]

On my x and y I have .04 one way and 3 the other way and zero volts with no movement. On my z I have .04 one way and 3 the other and 3 volts with no movement.

[jjacstcy]

Depending on which way the axis moves determines if I will have the 3 volts on the pin or not after movement. One way I will have 0, move it the other way and stop and I will have 3 volts.

[jjacstcy]

Also when it does change direction if I run another simulation the machine will move in the wrong direction and hit the limits

[ger21]

I think the G540 needs at least 3.3V to work correctly.

[jjacstcy]

Well how do I do that? I have 48 volts from my power supply and my parallel cable is putting out 5 volts. Its losing the voltage in the gecko?

[jjacstcy]

Gerry I believe it was just the home negative was set wrong. I changed it and is hasn't done it again, yet!

[ger21]

my parallel cable is putting out 5 volts.

You said it was 3V?

[jjacstcy]

No I got confused it is 3 volts. Me stupid sometimes!