The drivers have quite a bit of protection, so you probably won't ruin anything. You motors are jumping and that is just the motors engaging from getting power from the power supply.
There could be many reasons your motors don't turn. Consider these troubleshooting tips:
- If you are using our parallel breakout board, make sure that the step pins are set for active low (config -> Ports and Pins -> Motor Outputs -> the steps pins should be enabled and set active low)
- The parallel breakout board is powered (connect the USB to the computer using a USB cable)
- In Mach3, make sure you have jog enabled (a little green button at thelower middle of the page in the program run screen).
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My stepper motors stopped working all of a sudden. Mach 3 is running fine, just no signals getting to the motors. The lights on the motor drivers began blinking erratically when this started. Any advice where a problem like this can come from would be greatly appreciated.