DM542 Stepper Driver; red error-LED is continuously on

Hardware
1

Hi,

I am an engineer but completely newbie in Arduino technology.

I have purchased two DM542 controllers and two Nema 23 stepper motors for my Arduino Uno board.
During the very first tests, yesterday, I used just one of the motors and one of the controllers and could move the motor-shaft in both directions and with several speed with AccelStepper directory. So I was happy... :slight_smile:

But this morning, the red error-indicator LED of the driver is continuously on, as soon as I switch the external power supply on (Geti GLPS 3010 - 0 ... 30V, 0...10A) .

I think this problem does not come from Arduino because the symptom is the same in case of AccelStepper or direct motor control as well. Even more, if I unplug each input and motor coils from DM542, only the VCC and Gnd remain contacted, the error LED will be on in this case as well.

Obviously, I have already tested this problem with the other motor/driver set a few minutes ago as well (which has not been used at all so far...) but the result is the same.

So I am completely lost... I do not think both drivers have failed in the same time. (Or, I will buy a lottery immediately.)
I measured the output of the power supply as well but that is also okay. I measured its transients with oscilloscope; there are no obvious peaks.

Does anybody have any tip? (E.g. should I clear the error somehow?)

Thanks in advance,
Attila

2

Is it the 542 or 542T?

3

Just 542, without any extension. Both are the same.

4

Unplugging the motors while the unit has power can damage the unit.

5

Yes, I know, thanks. I did not do that.
Especially, in case of the second unit; it was "out of box" test.

What do you think: this is okay that I just plug the power supply "+" and "-" in the VCC and Gnd connectors (in the right order of course) and nothing else is attached, in spite of it, the error LED is on???

I am afraid these controller units are failed. One of them was failed already in the original carton box, and the second one could work just a few minutes...

6

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