Flood Coolant... how to wire it? - Page 3


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Thread: Flood Coolant... how to wire it?

  1. #25
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    Good thoughts.... Any suggestions on what to do for powering the relays?



  2. #26
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    Quote Originally Posted by lcvette View Post
    Good thoughts.... Any suggestions on what to do for powering the relays?
    Just get a separate 12V supply, or whatever is required. A $5 wall wart should do the job. E-Bay is your friend.

    Regards,
    Ray L.



  3. #27
    Gold Member neilw20's Avatar
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    Chris, Don't try and run your coolant relay as you propose.
    Us the NO VOLTAGE FREE contacts on either 'pin16' or Pin'1' on the right hand lower corner of the C11G.

    Be very careful trying to control the motor speed.

    It is quite worrying to see one side of your field connection going to C11 board.

    Do it all manually, quite separate to the C11 board until you have a good understanding of the dangerous, mains referenced potentials on the motor drive board. THERE IS NO ISOLATION, so you have + and - 160VDC available to fry both you and the C11 PCB.

    As for solid tapping, you have many hurdles to jump before that is possible. It is not trivial.

    Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.


  4. #28
    Gold Member john-100's Avatar
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    just to add to Neils reply

    only the C11G analogue is isolated from the printer port
    provided the 12V DC supply is only connected to the C11G board
    X1 power connector

    John

    Attached Thumbnails Attached Thumbnails Flood Coolant... how to wire it?-analogue-speed-control-jpg   Flood Coolant... how to wire it?-kb-input-jpg  


  5. #29
    Gold Member neilw20's Avatar
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    Not only is 0-10v isolated, but safe creapage distances for 240vAC is 6mm, and I have a C11G board to look at. 3mm for 110v.

    It will not give SAFE isolation, even though it is isolated.
    I would rate the isolation at 100v absolute safe maximum. Not suitable for 240vAC type isolation.

    Is the power supply rate for the proper isolation? An unearthed plug pack is often much safer than a good looking power supply.

    Believe me, as I have been engineering this sort of stuff for 40 years and seen it all (well enough of it to know what is unsafe).
    You can't use a C11G to give that sort of isolation. The isolation is intended only to prevent earth loops and noise for control signals.

    Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.


  6. #30
    Gold Member john-100's Avatar
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    Hi Neil ,

    you are correct
    you have the advantage of having a C11 board to look at

    with only 3mm spacing the board is only safe in the US

    for the UK and Australia etc
    I'd want a minimum of 8 mm spacing between the live speed control circuit and the rest of the board

    John



  7. #31
    Gold Member neilw20's Avatar
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    Quote Originally Posted by john_100 View Post
    Hi Neil ,

    you are correct
    you have the advantage of having a C11 board to look at

    with only 3mm spacing the board is only safe in the US

    for the UK and Australia etc
    I'd want a minimum of 8 mm spacing between the live speed control circuit and the rest of the board

    John
    8mm is nice.
    Regulations is 6mm. Standard 0.3" opto. I always put a slot under the device (or relay), as an airgap.

    This will replace a C11G and meet the regulations on our new machine.

    Sneak preview . Not released yet.
    http://www.toolmach.com.au/page18.html

    Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.


  8. #32
    Gold Member john-100's Avatar
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    Hi Neil ,

    the boards look good to me ,

    High quality boards and with the information you need printed on the top
    you don't need the book for simple tests

    with all the status led's and blown fuse indicators it should be childs play fault finding on the machine

    I guess a lot of hard work has gone into the design

    a nice linear power supply without the leakage currents of switch mode designs

    its too easy to get a shock off double insulated switch mode power supplies that pass the tests .

    the mains filter currents are un balanced when one side of the mains supply is connected to earth

    John



  9. #33
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    found the diagram on cnc4pc's site that showed the lead connected to the F terminal, is that possibly incorrect? Maybe itshold go somewhere else?



  10. #34
    Gold Member john-100's Avatar
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    Hi Chris ,

    since your motor has a field winding and not a permanent magnet
    I'd connect the wire to the smaller terminal I2

    -F1 and I2 are both connected to the negative terminal of the bridge rectifier
    but the way see it is
    because of the small resistance at the connection to the -F1 terminal
    a small voltage (due the field current ) would be added to the speed control signal if they are connected to the same terminal


    John



  11. #35
    Gold Member neilw20's Avatar
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    Hi Chris,

    I hope you can keep the smoke in.

    Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.


  12. #36
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    ok, from the manual i found this tid bit, not sure what it means or which the C11G is but I will begin trying to identify that to make a clear determination of which method is viable and correct:

    6.6 Voltage Following Connection – An isolated 0 - 9 Volt DC analog
    signal input can be used to control motor speed in lieu of the
    Main Speed Potentiometer. The control output voltage will linearly
    follow the analog signal input. The signal input must be isolated
    from the AC line. Connect the signal input positive lead (+) to
    Terminal “P2” and the negative lead (-) to Terminal “P1”, as
    shown in Figure 4. The source impedance of the signal input
    should be 10 kΩ or less. The MAX Trimpot is not operational in
    voltage following mode. Use the MIN trimpot to set an initial value
    of input signal. If necessary, use auxiliary trimpots to scale and/or
    limit the input voltage.

    CAUTION! Do not earth ground any input terminals.
    Notes: 1. If an isolated signal input is not available, or if using a
    4 - 20 mA DC signal input, install the optional plug-on SI-6 Signal
    Isolator (Part No. 9444). This will also allow direct connections to
    process controllers and microprocessors. 2. If multiple follower
    motors are to be controlled from a single lead motor or a single
    Main Speed Potentiometer, install the optional KBSI-240D Signal
    Isolator (Part No. 9431). 3. Terminal “F-” may be used in lieu of Terminal “P1”.




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Flood Coolant... how to wire it?

Flood Coolant... how to wire it?