Simple set of tests:
1) With current applied, you should be unable to turn the motor shafts with your fingers.
2) With no current applied, you should be easily able to turn the whole Z drive setup with your fingers.
It's a pain to cycle the thing manually, but that is one way to catch a rough spot.
You have two motors on the Z axis. If you have set your Vref's to match up with your motors, the Z axis driver gets twice the Vref as the rest. Each Z motor gets half of the current from the driver.
1) With current applied, you should be unable to turn the motor shafts with your fingers.
2) With no current applied, you should be easily able to turn the whole Z drive setup with your fingers.
It's a pain to cycle the thing manually, but that is one way to catch a rough spot.
You have two motors on the Z axis. If you have set your Vref's to match up with your motors, the Z axis driver gets twice the Vref as the rest. Each Z motor gets half of the current from the driver.