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  1. #1
    Guys i have been looking franticly for a thread on here that showed a link to an ebay item for allowing speed control of the vfd from Mach3/ EMC2. It was only about 10 does anybody remember it or can recommend one? The VFD in question is 2.2kw chinese job and matching VFD.

    Thanks

    Paul
    If the nagging gets really bad......Get a bigger shed:naughty:

  2. #2
    I think you can use the PWM output from mach3, possibly with a capacitor/resistor to smooth it. Use the input for the potentiometer on the VFD.
    Worth trying before buying anything?

  3. #3
    Jonathan that is a way i would prefer not to go and would rather use a dedicated DAC for the job. I would stll use pwm control settings in EMC2
    If the nagging gets really bad......Get a bigger shed:naughty:

  4. #4
    There's an option on the VFD to read 3 digital inputs to give 8 different speeds. If you've got enough I/O (i.e. another parallel port) then that could work. Might take a bit of fiddling to get EMC to provide the correct outputs? Not sure...

  5. #5
    Yes i have the same but would feel better about using ramp control of the spindle. This way i would ever need to remember top and bottom speeds.
    If the nagging gets really bad......Get a bigger shed:naughty:

  6. #6
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 3 Hours Ago Has been a member for 9-10 years. Has a total post count of 1,837. Received thanks 192 times, giving thanks to others 5 times.
    Most VFDs I've seen require 0-10VDC on the potentiometer terminals, but check your manual to be sure.

    What you need is something like the Spindle V3 from diycnc.

  7. #7
    This is practically the same as the one i was looking for, the only difference was the price 10 instead of 21 with free p&p. The option for now is o just wire manual controls up and build my own circuit. I've just ordered another Par card so that i can dedicate the pins for external controls etc in a single package. we will see where we go from there.

    cheers guys

    Paul
    If the nagging gets really bad......Get a bigger shed:naughty:

  8. #8
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 3 Hours Ago Has been a member for 9-10 years. Has a total post count of 1,837. Received thanks 192 times, giving thanks to others 5 times.
    I just done a bit searching, and it would appear from a couple references, that the older spindleV2 board was cheaper.

  9. #9
    Is it worth mentioning that a DAC is a simple resistor ladder, ADC's are the tricky blighters :whistling:

  10. #10
    LOL! normally harder to climb ;-)
    If the nagging gets really bad......Get a bigger shed:naughty:

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