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  1. #21
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    Default Re: How to use relay on break out board

    Hi Gerry,

    Did you have a chance to take a look?



  2. #22
    Member ger21's Avatar
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    Default Re: How to use relay on break out board

    I loaded your profile, but since my desktop is running windows 10, I can't really test anything, or see why it's not working.

    I just looked at the screen, and the LED flashing is the default behavior, so it appears that it should be working. I was wrong before.

    What I would do is try to measure the voltage on the output pin for the relay at the port, to see if it's changing state.

    Gerry

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  3. #23
    *Registered User* matc493's Avatar
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    Quote Originally Posted by Curran View Post
    I found if I have the USB connected the relay is always closed (the 5v from the USB is directly connected to the relay) and if it's not connected it's always open. I can control it through mach3 even though my settings are exactly the same as the PDF I attached. The pwm output works though (as does everything else) so I assume the settings are correct. I have 2 of these break out board and they work the same so I don't think it's a faulty break out board either.
    i find out that you need the 5v usb to work the relay. did you found a way to avoid that? because i dont know how to conect my kl-8056D to 5v pins



  4. #24
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    Default Re: How to use relay on break out board

    you need the 12 to 24V supply to power the limit switch circuits and the PWM to analogue circuit
    and you need the the USB cable to power the two 74HC245 octal buffer IC's and the relay

    with the jumper next to the relay installed ,
    a high level logic level (over 3V) on printer port pin 17
    will be switched on the relay

    without the USB cable ,
    the CMOS 74HC245 buffers can only work by virtue of some of the printer port pins being at +5V
    and powering the IC via the internal protection diodes
    note the IC outputs will be lower than they will be when powered correctly by the USB +5V

    How to use relay on break out board-ebay-cnc-bob-jpg

    in the photo
    if you look at the 3 terminals to the right of the output P1
    you will see one labelled PC GND and two PC +5V

    depending on how you wire the kl-8056D

    you can either use the PC +5V as a common positive to the kl-8056D step & direction inputs

    or use the PC GND terminal

    John


    PS

    the TX14175 found in some 6040 control boxes
    has 5V regulator & 5V to 5V DC converter to generate the isolated 5V supply for the IC's


    How to use relay on break out board-tx14175-circuit-jpg

    Last edited by john-100; 06-11-2018 at 06:50 AM. Reason: add detail for kl-8056D input connection


  5. #25
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    Default Re: How to use relay on break out board

    Quote Originally Posted by Curran View Post
    Any ideas why?
    Yes in motor outputs

    Spindle Dir Low Active should be unchecked, there PDF is incorrect, then you will hear the relay turn on / off when you toggle spindle control buttons,

    The Breakout Board also needs a 5v Dc power supply either from the USB or 5v connected direct to the correct 5v input terminal, you can't have both, one or the other

    Mactec54


  6. #26
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    Default Re: How to use relay on break out board

    Quote Originally Posted by matc493 View Post
    i find out that you need the 5v usb to work the relay. did you found a way to avoid that? because i dont know how to conect my kl-8056D to 5v pins
    You need to connect a 5v dc power supply and a 12v dc supply to make everything work on the board, the USB connection can be used for the 5v supply, but it is always better to have an independent 5v supply

    Mactec54


  7. #27
    Member john-100's Avatar
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    Default Re: How to use relay on break out board

    if you connect a 5V power supply to the PC GND & PC 5V terminals as suggested by Mactec54

    you have to ensure you connect the supply correctly as there is no reverse polarity protection powering the board that way

    also do not connect the USB cable and external 5V power supply as it is very likely to damage the USB port

    John



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How to use relay on break out board

How to use relay on break out board