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  1. #1
    Hello

    Can someone help me with the wiring of a Sprint 400 driver board. The manual is here

    https://www.sprint-electric.com/wp-c...0_1200-web.pdf

    I want to connect it to the spindle on my Denford Micromill. The datasheet gives 4 outputs, two as "armature" and two as "field". I have to admit that I don't really know what these mean or how to identify the four on the spindle. However, when I apply mains power to the board, there is 0V on the "armature" pair, and 200V DC on the "field" pair. If I connect the 10V reference on pin 1 to the input on pin 3, nothing changes. What I need is for the DC output to go from 0 to 90V (the spindle maximum). Would appreciate some guidance

  2. #2
    Quote Originally Posted by jolyonjenkins View Post
    Hello

    Can someone help me with the wiring of a Sprint 400 driver board. The manual is here

    https://www.sprint-electric.com/wp-c...0_1200-web.pdf

    I want to connect it to the spindle on my Denford Micromill. The datasheet gives 4 outputs, two as "armature" and two as "field". I have to admit that I don't really know what these mean or how to identify the four on the spindle. However, when I apply mains power to the board, there is 0V on the "armature" pair, and 200V DC on the "field" pair. If I connect the 10V reference on pin 1 to the input on pin 3, nothing changes. What I need is for the DC output to go from 0 to 90V (the spindle maximum). Would appreciate some guidance
    Something sounds amiss. Did you blow yours up or was the drive not supplied in the first place???.


    I can't see it happoening myself. The 0-90v units look like they run off 115vac input. (u.s. ver input)
    On 230vac input they give you 0-180v (looks like this is what you are finding). (u.k. ver input)

    PLEASE NOTE:
    There is only one board that puts out 0-90v on a 230vac input and that is the:
    KBIC-240DS
    This is extremely likely the one you need.
    https://www.axiscontrols.co.uk/produ...eed-controller

    Who put you onto the sprint???.
    The sprint is for the 180v motor types that exist, or the u.s. 90v types.

    The official boards are these by the looks of it:
    https://www.kbelectronics.com/data_sheets/kbic_oem.pdf
    http://www.kbelectronics.com/data_sheets/kbic.pdf
    https://www.axiscontrols.co.uk/produ...eed-controller


    (sounds like the motor would be the u.s. standard one and they threw a quick fix board in for u.k voltages if you weren't given the control).

    There's 3 options here.
    1. you find a 180v motor for it.
    2. have to resort to the buying the KB control board.
    3. get 115Vac input to the sprint 400.
    Last edited by dazp1976; 09-12-2021 at 09:59 AM.

  3. #3
    Quote Originally Posted by dazp1976 View Post
    Something sounds amiss. Did you blow yours up or was the drive not supplied in the first place???.


    I can't see it happoening myself. The 0-90v units look like they run off 115vac input. (u.s. ver)
    On 230vac input they give you 0-180v (looks like this is what you are finding). (u.k. ver)

    The official boards are these by the looks of it:
    https://www.kbelectronics.com/data_sheets/kbic_oem.pdf
    http://www.kbelectronics.com/data_sheets/kbic.pdf
    https://www.axiscontrols.co.uk/produ...eed-controller

    PLEASE NOTE:
    There is only one board that puts out 0-90v on a 230vac input and that is the:
    KBIC-240DS
    This is extremely likely the one you need.

    (Initially the motor would be the u.s. standard one and they threw a quick fix board in for u.k voltages). Because it was cheaper!.

    There's 3 options here.
    1. you find a 180v motor for it.
    2. have to resort to the buying the KB control board.
    3. get 115Vac input to the sprint 400.
    I might have blown mine up. There was a cascade of errors which led to me basically replacing a lot of the electronics.
    I got a second hand board from ebay. It looks identical to the original board, and identical to the ones that I've seen in photos of other Denford micromills. The sprint board has a jumper which lets you set the input voltage to 230V (or 110V) so I'm not sure why you think I need the KB driver.

  4. #4
    Quote Originally Posted by jolyonjenkins View Post
    I might have blown mine up. There was a cascade of errors which led to me basically replacing a lot of the electronics.
    I got a second hand board from ebay. It looks identical to the original board, and identical to the ones that I've seen in photos of other Denford micromills. The sprint board has a jumper which lets you set the input voltage to 230V (or 110V) so I'm not sure why you think I need the KB driver.
    Your pdf has a typo. This is the proper one:
    https://www.transdrive.co.uk/media/1...200-manual.pdf
    The sprint 400 is: 110/240 = 90/180
    So: 110v = 90v and 240 = 180v

    The switch is just an input voltage selector like on a meanwell power supply.
    However. Unlike a meanwell, a speed control is relative to it's input.
    So if it gets 240v it'll put out 100%. If it gets 110v it'll only put out 50%.
    Ergo 180/90.

    Unless you have the actual 180v version motor for it I'm afraid you likely need the KB.
    (basically a bodged voltage board worked out cheaper to get u.k. sales)

    Yours may look the same to others but they'll likely have the 180v motor too.
    Like this:
    https://www.ebay.com/itm/393622606533



    I may have updated previous post too while you responded.
    Last edited by dazp1976; 09-12-2021 at 11:16 AM.

  5. #5
    Quote Originally Posted by dazp1976 View Post
    Your pdf has a typo. This is the proper one:
    https://www.transdrive.co.uk/media/1...200-manual.pdf
    The sprint 400 is: 110/240 = 90/180
    So: 110v = 90v and 240 = 180v

    The switch is just an input voltage selector like on a meanwell power supply.
    However. Unlike a meanwell, a speed control is relative to it's input.
    So if it gets 240v it'll put out 100%. If it gets 110v it'll only put out 50%.
    Ergo 180/90.

    Unless you have the actual 180v version motor for it I'm afraid you likely need the KB.
    (basically a bodged voltage board worked out cheaper to get u.k. sales)

    Yours may look the same to others but they'll likely have the 180v motor too.
    Like this:
    https://www.ebay.com/itm/393622606533



    I may have updated previous post too while you responded.
    Ah, this might explain why I can only get 100V out of it. Hmm. There do seem to be fairly cheap PWM DC-DC controllers on Ebay which I could maybe bolt on

  6. #6
    Quote Originally Posted by jolyonjenkins View Post
    Ah, this might explain why I can only get 100V out of it. Hmm. There do seem to be fairly cheap PWM DC-DC controllers on Ebay which I could maybe bolt on
    Did you have it running before?.
    Did you plug it in and pretty much blow the lot by any chance?.

    Everything I look into so far is showing me schematics with 110v input.

    This suggests to me that there should be a 220v-110v transformer in there for use with u.k. supply.
    Last edited by dazp1976; 09-12-2021 at 01:01 PM.

  7. #7
    Quote Originally Posted by dazp1976 View Post
    Did you have it running before?.
    Did you plug it in and pretty much blow the lot by any chance?.
    Everything I look into so far is showing me schematics with 110v input.
    This suggests to me that there should be a 220v-110v transformer in there for use with u.k. supply.
    Okay so. From what I said previously.

    On this Denford data page in the 4th post down:
    https://www.denfordata.com/bb/viewtopic.php?f=36&t=2929
    The schematic shows the 'power transformer' which converts u.k. 240vac into 110vac for the machine.

    Micromill-electrical-feb-2000.pdf
    https://www.denfordata.com/bb/download/file.php?id=2796
    Micromill-denstep-electrical-June2000.pdf
    https://www.denfordata.com/bb/download/file.php?id=2795

    Look for this in your machine. Could be the overall culprit.

  8. #8
    I had it running before. The guy who had the machine before me had converted it to run on Mach 3 rather than the proprietory Denford software. I ran it on LinuxCNC and never bothered trying to get variable speed working so I don't know whether the spindle maybe always getting a constant 100V. The smoke came about when I idiotically tried to fix a disconnected wire to one of the steppers while the power was on. This blew up one of the transistors on the Baldor stepper driver board. Every time I tried to replace something or troubleshoot it with the 'scope I blew up more of the Baldor board though clumsiness, so I ended up stripping out all the original electronics and putting in new stepper drivers. In the process I disconnected the spindle and the connections between the Sprint board and the Baldor board, and when I came to try to reconnect the Sprint board (some months ago) I couldn't quite work out how to do it and I thought maybe the Sprint board was dead so I got a new (second hand) one.

    In the mean time I replaced the spindle with a low powered one which has its own PWM driver, but I would like to get the original one working again

  9. #9
    Ah our posts overlapped. There is indeed such a transformer. Yes I should probably be powering the board from that.

  10. #10
    Quote Originally Posted by jolyonjenkins View Post
    Ah our posts overlapped. There is indeed such a transformer. Yes I should probably be powering the board from that.
    Yes.
    There should be 100v output on the trandformer for the sprint. (hopefully, from the drawings). May even still be connected?.
    Now you have all the schematics hopefully you can figure out the driver board for 0-10v control. All below:

    Sprint:
    https://www.transdrive.co.uk/media/1...200-manual.pdf
    Micromill/Novamill:
    https://www.denfordata.com/bb/viewtopic.php?f=36&t=2929
    https://www.denfordata.com/bb/download/file.php?id=2796
    https://www.denfordata.com/bb/download/file.php?id=2795



    Be careful. There's bits in there from both the Micromill and the Novamill.


    Took me most of the bastard morning to research this machine.
    All the info is basically buried.

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