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Motor does not turn or turns jiggly


Possible causes :

  1. One or more lines in the motor wiring are broken or shorted together or to the chassis
    - Unplug the motor connector from the controller and measure the resistance between pins 1 and 2 / pins 3 and 4 of the connector

    THERE MUST BE NO CONNECTION OF PINS 1 AND 2 TO PINS 3 OR 4!
    StepperMotor-bipolar stepper sch.png
    The resistance should be around 2-4 Ohms.
    If it is less than 2 Ohms you have a short in the wiring of those two lines or the coil of the motor is bad.
    If it is much more than 4 Ohms (towards infinite) you have an open circuit in the wiring of those two lines or the coil of the motor is bad.

  2. Stepper driver module is set to wrong reference voltage
    - check the reference voltage set at the stepper driver modules
    The reference Voltage should be set to 0.55V
    (works better for most cases that the 0.425V stated in the Velleman manual)

    If it is set too low the motor will have too less force to turn.
    If it is set too high the motor has too much current, thus affecting proper microstepping and causing the stepper drivers to overheat, resulting in lost / skipped steps.

  3. Stepper driver module faulty

    - swap the stepper module with one of a working axis and try if the error moves with it

    MAKE SURE THE WIRING IS CORRECT BEFORE DOING THIS!

    If the error moves with the driver, the driver module is faulty and you need to replace it.
    If it does not, check the previous steps again!


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