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Controlling stepper motor with a BRX PLC Ė BX-DM1E-10ED13-D

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  • #16
    Yeah, that seems odd. Please let us know how all this turns out for you.

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    • #17
      The BRX web page says it can do 12-24v output, so 5v wont work.

      I got scared for a second when Mike Nash suggested 24v to the stepper. I am used to the advanced microstepping drives and anything more than 5v will fry the inputs. Looked up the specs on these models and it seems they do support 5-24v inputs.
      Make sure you have +24v on the +step and +dir inputs on the stepper, and then -24v on the 1C on the BRX for the output common. Then the y0 goes to -step and t1 goes to -dir. You dont want anything wired to the 5v stuff from the stepper PSU for this.

      I do wonder if maybe there is a jumper somewhere to select whether you are using 5v, 12v, or 24v inputs?





      As for why your cant see the voltage change on the BRX outputs, you wont when using a multimeter. They are simply not fast enough and only show you an average of the voltage. You would have to hook the output up to an oscilloscope to see the pulses going by. I believe Do-more software has a view where you can see the pulses in the same format as an oscilloscope in the software itself to verify waveforms.
      Last edited by MikeN; 02-18-2019, 11:58 AM.

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      • #18
        MikeN, The BRX does say it can work from 5-36 operating voltage range, 12-24VDC nominal. I don't know if I have tried it yet, though I reckon I ought to (but my test unit is sourcing.)

        The meter would tell you if you had a frequency output if the duty cycle was 50%, yielding maybe 2.5VDC as opposed to 0-ish or 5-ish if not. Definitely not my first choice for frequency though.

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        • #19
          This is the wiring diagram from the manual for a BRX MPU using a surestep. It clearly states that 5 VDC should work fine

          Click image for larger version

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          • #20
            Weird. Guess its time to update the webpage with accurate info?


            Click image for larger version

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            • #21
              How 'bout that? I often have trouble finding some of the specs of many products because they don't all seem to be in one place. Pick your manufacturer. I did spend some time checking the specs but did not happen across the diagram. I don't think I even looked at Chapter 12. Must be why we are always told to read and understand the manual before using the product.

              I do have one more thought, but I don't mean to imply anything by it. I would swap Step- and Direction- with each other and try Step/Direction one more time. I can't trace your wires since the pix are cropped, but swapped wires is a really easy thing to miss, especially when all three are white.

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              • #22
                Outputs are fine at 5v, inputs need 12-24v.

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                • #23
                  Mike, Although I knew that's not the case but I did swap STEP- and DIR- as you suggested in Post #21. No luck.

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                  • #24
                    Thanks guys for your help! The Y0 output was faulty. I have gotten a replacement for the same MPU module and it's working fine now.

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