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Motor control advice needed

Dreckly

I have a 230v extractor fan with a long moveable "trunk" for removing fumes from a welding area. I have fitted a normal 230v motor starter. The trunk has an inbuilt cable with a pair of 24v ac LED worklights and a switch on the end. My customer wants to be able to turn the fan on/off from the end of the trunk using a second switch already fitted to the inbuilt cable.
My plan is to change the motor starter contactor to one with a 24v coil so that I can use the existing built in cable, power supply and switch. The switch is just a one way switch so I think I will need a DPDT relay to provide the function of remote start and stop buttons.
Am I over-thing this or is there an easier way?
Dave

  • 0

    More info needed.

    Is the motor starter the kind expecting twp push buttons, one N/O to start one N/C to stop, or is it a simple on while live type arrangement.

    The latter you could do with a relay the former needs more thought. How many lines run down the trunk - is it just 2 core (24VAC) and the existing switch is operating the lights, or do you have a switched wire running back ?

    There are tricks to use one  line to signal 3 states with diodes and so on, but I suspect you;d rather not.

    Mike.

  • 0 in reply to mapj1

    The motor starter is the former, one N/O to start one N/C to stop.

    The cable down the trunk is 4 core 24VAC with 2 cores in use as L and N for the supply to the LED worklight and switch. The spare switch is SPST and can be easily wired to any of the cores so yes, it's easy to provide a switched wire running back to the box containing the 24V supply.

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