Z axis home problem one axis goes the wrong way

[haydms]

Printer Model

Voron 2.4

Extruder Type

Clockwork 1

Cooling Type

Stealthburner

Gents I need some advice on a Z axis home problem. Set up is BTT Manta MP8, Can Bus 2209 /2240 and tap.
Sequence
Home X
Z goes up 10mm
X goes to home through the Can Bus (no issues)
Home Y
Z goes up another 10mm
Y goes to home (no issues)
Home Z
Z goes up another 10 mm
X and Y go to center position (no issue)
z motors front left (motor 3 z0) back left (motor 5 z1) back right (motor 6 z2) all go DOWN. Now the issue, front right motor (motor 7 z3) goes UP???
Troubleshooting attempt so far.
ran STEPPER_BUZZ=stepper _z3 it only moves UP
changed cable no difference.
changed driver no difference.
any ideas would be appreciated, I have built other printers in the past but using the Duet board never BTT and Klipper. It's as though it's not getting a negative pulse.
Regards,
Mark

 

[shiftingtech]

any chance z3 is actually in the slot labelled "Motor_6"? and it's a manta m8p v1.1?

There's a known issue in the first release of that board, where the dir_pin of motor 6 is non-functional, leading, to, well...exactly what you describe.
The only solution is to move that motor to a different slot.

if it's not that, the issue still relates to the dir_pin. You should double check that the pin has been correctly identified for the exact version of the board you have

 

[haydms]

Shiftingtech,
your absolutely right it is in "Motor 6" and it is a MP8 V1.1 that's the issue. The problem now is for "Motor 7" the CS is PD12 that's also the can bus, so that's a no go unless i can change the can to another address (error: pin PD13 is reserved for CAN). Then i moved to "Motor 8" and I get the following. "Unable to read tmc uart 'stepper_z3' register IFCNT". So now I'm lost, I purchased the board from BTT in December, any ideas?
Regards,
Mark

 

[shiftingtech]

are you sure you're looking at the right pinout?
according to this, the m7 cs is PD14, not PD12

 

[haydms]

Shiftgtech,
sorry its late, I'm old (so my wife says) and a horses a@@ at times, I was looking at version 1 last time I reprogrammed the *.cfg file not 1.1 signals, its working now and so is the CAN and Tap. Tomorow I will work on my other issues. thank you for all the help I appreciate it. Was almost ready to go back to a duet (at least I know that well). I must admit I'm disappointed in BTT USA sending out the board knowing batches had an issue, but that's a topic for another day. Thanks again night.
regards,
Mark

 

[Anatolygor]

Hi.
I had the same issue. Z3 motor just kept going up. It turned out that pins on motor 6 of M8P board V1.0 and 1.1 are different. on 1.1 it's DIR PA14, Step PA10, EN PA15 and uart PF8.. Once I changed the pins, all went smoothly