Strange issue with Marlin and G34

I have a strange issue where the G34 command causes the dual Z steppers to diverge rather than converge whilst running.

The Z motors work absolutely spot on but I can't figure out why G34 seems content to move the steppers apart rather than converge the measurements in order to level the axis.

I've tried flipping motors around. Flashed Marlin to a different version etc but I still can't figure out why it's doing this.

Does anyone have any ideas ?

Thanks.

I had a similar problem I had entered the axis coordinates wrongly in Configuration_adv.h

Quote
Nikki81
I had a similar problem I had entered the axis coordinates wrongly in Configuration_adv.h

Thanks. I'll take a closer look at that and see what if I can spot something.

For reference managed to sort it.

I swapped the two motors over on the board - just switched the Z1 wiring to Z2 and Z2 wiring to Z1, and for some unknown reason that works . Not sure at all why, but it worked. Must be something in the code.

Edited 1 time(s). Last edit at 10/17/2021 11:02AM by ss002d6252.

... the direction of the steppers can be changed by switching the wires of one solenoid or by "mirroring" the plug - so you eventually rearranged them, so it's for better now

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The odd thing is that it wasn't anything to do with reversing the motor direction. All that had already been tried , in multiple combinations.

There was no problem with controlling Z in the right direction, only when using G34 was it working wrongly.

I literally just swapped the entire wiring, in exactly the same wiring order, from Z1 to Z2 (and Z2 to Z1) on the board. Bizarre, but it worked.