High power driver failure

you should dig around there is likely more than one seller

Hi Alex,
I completely agree but my problem right now is I am having serious odd issues. Langmuir has dragged their darn feet so long I am out of patients and I need a plug and play solution.
If these do not work then I will try and order the 542. I am not an Ali fan and these might not even come. Is there is anyway possible for you to put a pin-out and wiring on here or are you aware of a link to what you might have used? Looks like some others are looking to give this a shot as well.

The pinout is shown directly on the drivers and the EM542 that I mentioned.

On the EM542 you need to set the following dip switches:

  • 5v signaling (this one is on the side)
  • 1600 steps per revolution
  • 4.2A
  • Smoothing time: 12ms
  • No auto tuning (I had bad luck with it)
  • Control mode: step dir
  • Default everything else (off)

This is what the drive looks like, as you can see it is self documenting:

Here is a CWD860H:

You’ll need to swap PUL and DIR pins, high voltage pins are the same. Langmuir doesn’t hook up the ENA pins. Power supply may need to be swapped (my MR-1 has black for 36V, white for ground – very weird for DC).

The EM542S is slightly smaller and you either need to drill a new mounting hole or make an adapter plate (I did the latter).


Your an absolute blessing!! Thank you Alex!!

Hi Alex,

Believe it or not those drivers came from China in about 10days.
I have a question. I opened the cabinet and noticed I have one upgraded driver (assuming) z. Unfortunately this is the driver I seem to have issues with so should I swap this with a new driver to see if anything changes?
Are you aware of any documentation for these new drivers on installing them? I don’t see anything on them.

Is this swap for the Langmuir 860H drivers?

Follow the phase wires from the driver to the back of the machine to see if your current large one is on X or Z. Langmuir has shipped them both ways.

There is some guidance from Langmuir here on swapping drivers:

The documentation on swapping drivers is here:

All of the drivers have documentation for the pins printed right on them. Take a photo of how it was wired before you start moving pins around in case you need to check what color wire had which role.

Good luck, hope the driver upgrade fixes your issues.

Wow you are correct that is on the X not the Z. Cant keep up:)

This was a bit intimidating at the start but I get it now.

Me to. I am keeping my fingers crossed and hope the control board fixed most of them.
Thanks again.