@Veti Indeed, followed up your advise and that works out fine. Thanks!
@Veti @fcwilt
And the story continues:
My set-up
Mainboard 4 z-steppers (Nema 23, 2.8 Ampere)
Expboard 0: 3 extruders
Expboard 1: X and Y stepper (nema 23, 4 Ampere)
Exp board2: U and V stepper (Nema 23, 4 ampere)
Mainboard: 12 V supply
Expansion boards: 24 V supply
Switch to 24 Volt was done in a later moment after I purchased several 12 Volt other elements. Have insufficient space to install another 24V power supply.
Commissioning
Okay now my Z-steppers provide the correct amperage when issuing M906.
Commissioning the Z motors is done by first disabling the endstop requirement by
M564 S0 H0
Pushing the buttons on the machine movement tab should move the motors.
Result
Out of the 4, only two Z-steppers react on the commands to move.
Both motors move irregularly.
For one of the motors, once it starts stepping it will continue stepping, but it decides itself if it takes the required direction, sometimes it is up, some times it is down or it just stutters at the down command.
The other motor hardly turns and also changes its mind regularly to up or down stuttering.
In addition, the first motor is not activated after the step-cycle is finished, that is okay.
The second motor however remains kept energized. I did not realize it until I found that the motor got quite hot and even the power cable became warm.
I have a continuous readout of voltage (both 12 V and 24V) and that one is keeping stable during this excercize.
Changing the mainboard from 12 V to 24 V will likely change the issue of the warm cable. Nevertheless keeping it energised is never the intention. I have to reset the board to get it de-energised.
What would be the reason behind iregular stepping?
Why is one motor kept energised?
PS I did not yet switch cables to find out if the cables are crimped (in)correctly.
Harald
