I bought a DM 556 to driver a Nema 23 stepper motor on my CNC plasma cutter. It worked once then I got a steady red error light on the driver. The standard errors are flashing lights not a steady red light. I bought another one and that worked fine for a while but I had problems with the motor shuddering and not advancing normally. I have now bought a third and have the initial steady red error light. Can ayone tell me what a steady red light means. I have not jumped power to the ENA + terminal as I have seen in a youtube video that this can cause a steady red error light. Any help is appreciated.