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  1. #1
    Need help please, with my Seig CNC. This is an early conversion from Arc. Had problems for some time with the front guard micro switch. So took out the switch and coupled the wires together. Solved the problem and all was well until I accidentally dropped the wires and shorted the main fuse. I can now hear the relay clicking in and out as normal but no spindle movement. If you have any inclination towards a possible solution, I would be extremely grateful.

  2. #2
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Last Activity: 1 Week Ago Has been a member for 9-10 years. Has a total post count of 1,600. Received thanks 110 times, giving thanks to others 69 times.
    There might be a main power fuse blown that feeds the spindle (as well as a fuse in line near the spindle's drive). Are you getting power to the spindle drive?

  3. #3
    Chaz - No just getting the normal audible click on and click off. This is the model with the separate 12v power supply at the back of the column. Having my sparkbuddy check it out in the morning.

  4. #4
    have you asked Ketan @arc eurtrade

    Photos of the speed control board and CNC interface will be useful

    my mini lathe for example has a seig FC250 PWM speed control board with 2 FET's as the control devices
    the board has has two relays that form a no-volt release and interlock that forces you to start at minimum speed

    later machines have a XMT2325 speed control that uses two thyristors as the control devices that are part of a controlled bridge rectifier

    once the various boards have been identified it will be easier to fault find

    John
    Last edited by john swift; 13-08-2018 at 09:05 PM.

  5. #5
    John - Thanks for help. I will take some photo`s this morning,

    Rod

  6. #6
    John - Here is photo of board. The two blue wires next to the central small white box are the ones I shorted. The card is marked SEIG MACHINE zz0070201A Click image for larger version. 

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  7. #7
    I have not found an exact match but this PDF wiring diagram for a
    110V mini lathe gives you a basic wiring diagram
    PDF diagram
    Click image for larger version. 

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    for the CNC conversion
    the speed control potentiometer that is normally connected to terminals p1 to p3 has been replaced by
    a DC control voltage connected to p1 & p2



    without the circuit diagram of the speed control board
    I can not guess what the blue wires are connected to and
    what possible damage to the board could of happened to the board

    Click image for larger version. 

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    if the under side of the PCB looks OK with no blown tracks
    it will be possible to bench test the board using a 100W bulb as a dummy load in place of the motor and a potentiometer connected to P1 to P3
    NOTE - all the board & the wiring to the potentiometer will be live !!!

    repairing my CL300m lathes speed control board
    https://www.model-engineer.co.uk/for...p?th=38809&p=1

    John

    PS
    found it
    the board is a XMT-2360

    Click image for larger version. 

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    Last edited by john swift; 14-08-2018 at 11:59 AM. Reason: add PS & XMT2360 photo

  8. #8
    John - Thanks, the board is XMT 2360. The two blue wires are connected to the green chuck guard switch you have indicated. There are currently 3.6V across the terminals.

  9. #9
    Les has details of the XMT-2360 on his web site
    http://lesjhobbies.weebly.com/upload.../pcb_speed.pdf

    if your lucky R17 on page 2 has gone high resistance when terminal K3 shorted to earth

    terminal K4 shorting to earth will be of a problem

    John

  10. #10
    John - If the R17 has gone high. Is there anything I can do?
    Rod

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