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Buzz stepper test


WillyM

Question

I'm doing this test on my newly built 2.4, and all was going well until I got to Z3. This motor, rather than cycling back and forth just continued to drive up in pulses for the duration of the test. I switched cables, and drove Z3 from Z2 and it worked as expected. I tried changing the TMC2209  for a spare with the same result. Any thoughts on what could be causing this?

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1- Changing to another motor (z3 -> z2),

2- replacing cables and 

3- replacing the tmc2209

 

will prove that

1- the motor is not defective

2- the cable is not wired incorrectly

3- the tmc driver of Z3 is not defective.

 

I would have expected a wrong wiring of the motors as the number 1 cause for the behaviour of 'vibrating' instead of going forwards and back. A 'broken' motor would also have caused this. I think you have proven that these both are not the case.

I would connect the motor of Z2 to the Z3 cable and if the same happens you will also have proven the cables and the routing of z3 are good. Which you also did by replacing the cable.

You could also have swapped the TMC driver from Z3 with any other driver if you hadnt had a spare one.

 

Remains the klipper configuration. Did you enable the pin for Z3? Check if the rest is the same as the other z motors.

If this last option doesnt solve it.. Then I have no other thoughts 🙂

 

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5 hours ago, WillyM said:

Next I'll be looking at the config file and checking PIN numbers.

I had the same problem with my v2.4 in the early days.

It's down to the configuration, you just have to logically work through the permuations (I think mine was down to incorrect direction and enable pin combination).

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Problem solved - the pin out for Motor 6 in the User manual has an error on the Dir pin. The diagram on Github is different. When I edited my config file to match the latter, the buzz test works successfully for Z3. Apparently there are similar issues for Motor 7 (extruder drive) which will come later.  Thanks again for the support.

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