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Thread: Thermostatic controlled fan on old CP200?

  1. #1
    Join Date
    Mar 2018
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    Thermostatic controlled fan on old CP200?

    Hello all

    I have a old miller CP 200 which I converted to operate on single phase power, I did the HASS-Kamp conversion on it and it works very well.

    The only down side to an old CP200 is the loud continuously running fan which can be very tiresome

    I had an old Millermatic 35 that ran a thermostatically controlled fan which used a relay and two thermostats, one embedded in the main transformer winding, the other attached to the rectifier assembly.

    Id'e like to add this same feature to the CP200 but I do not know where the best location would be to embed or locate the thermostats in the windings particularly having three coils to deal with.

    Any thoughts would be greatly appreciated.

  2. #2
    Join Date
    Mar 2010
    Ceres, California
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    Re: Thermostatic controlled fan on old CP200?

    All you need is a thermostat on the weld diode heat sink.
    Just look up the thermostat on a different newer welder and run it to a relay and turn the fan off and on. think it is around 100 to 130 degrees to close and turn on fan.
    Most of the welders that have sensors in the transformers use them for an over heat shut down. a few use them to control the fan motor.

  3. #3
    Join Date
    Dec 2008
    Lockhart,Tx (BBQ capitol of the world)
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    Re: Thermostatic controlled fan on old CP200?

    Here are a couple of surface mount thermostats.
    They are close on rise at 130 degrees F and auto reset.

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