Steppers using KFlop/Kanalog via JP4 and pin 15/16


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Thread: Steppers using KFlop/Kanalog via JP4 and pin 15/16

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    Default Steppers using KFlop/Kanalog via JP4 and pin 15/16

    Have a working NEMA 23(and a 34) stepper (ie the driver/ motor/ power supply will generate motion on an arduino). Have xyz as channels 0,1,2 run by large servo with rotary and linear encoders. Wish to use stepper to drive a 4th axis.

    I need to multiplex JP7 to JP4/6 using

    FPGA(STEP_PULSE_LENGTH_ADD)=32 + 0x40;

    so as to allow JP4 15/16 to be step/dir respectively

    As I understand it channel 3 should be set to step/dir for output (no input being appropriate for steppers) and the output channel of "0" should be set to step direction 1 as step/dir0 is not available (as the resistors prevent pins<15 being used for step/direction and pins 13/14 are IO22/23 step/dir0)

    The driver is optoisolated. I have DIR+ & PULSE+ connected to 5volts(pin one of JP4) the DIR- & PULSE- are connected to pins 16/15 respectively.

    No stepper movement.

    I have enclosed the c code for initializing only the channel 3

    Read and puzzled for sometime like something totally obviously wrong not seeing it - need a bit of insight/help


    TIA
    Owen

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    Default Re: Steppers using KFlop/Kanalog via JP4 and pin 15/16

    Hi Owen,

    That all sounds correct to me. What kind of Stepper driver you you have and what are the input specifications?

    You might try a max width pulse with:

    FPGA(STEP_PULSE_LENGTH_ADD)=63 + 0x40;

    and inverted with:

    FPGA(STEP_PULSE_LENGTH_ADD)=63 + 0x80 + 0x40;

    Regards

    TK
    http://dynomotion.com


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    Default Re: Steppers using KFlop/Kanalog via JP4 and pin 15/16

    What driver are you using?



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    Default Re: Steppers using KFlop/Kanalog via JP4 and pin 15/16

    Stepperonline DM542T

    Electrical Specifications:
    * Output Peak Current: 1.0~4.2A (3.0 RMS)
    * Input Voltage: +20~50VDC (Typical 36VDC)
    * Logic Signal Current: 7~16mA (Typical 10mA)
    * Pulse Input Frequency: 0~200kHz TTL compatible and optically isolated input
    * Pulse Width: 2.5μS
    * Isolation Resistance: 500MΩ




    Attached Thumbnails Attached Thumbnails Steppers using KFlop/Kanalog via JP4 and pin 15/16-img_2363-jpg  


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    Default Re: Steppers using KFlop/Kanalog via JP4 and pin 15/16

    Tom

    Thanks
    the second suggested line worked I guess it needed the inversion

    Not sure why, but it works.
    Owen



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    Gold Member TomKerekes's Avatar
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    Default Re: Steppers using KFlop/Kanalog via JP4 and pin 15/16

    Hi Owen,

    That can occur when the optocoupler turn on time vs turn off time is different.

    Thanks for posting back.

    Regards

    TK
    http://dynomotion.com


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    Default Re: Steppers using KFlop/Kanalog via JP4 and pin 15/16

    It's probably because that driver is a Leadshine in disguise, so needs the extended timing.



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Steppers using KFlop/Kanalog via JP4 and pin 15/16

Steppers using KFlop/Kanalog via JP4 and pin 15/16