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    ChuckNorris's Avatar
    ChuckNorris Posts: 2, Reputation: 1
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    #1

    Jan 7, 2016, 04:16 AM
    Air Handling Unit with heater battery - delay time when switched off
    It's complicated..

    I've got a switch Test/Auto/Off


    In Auto mode..

    I've got a fan that blows air through a heater battery to provide hot air . Everything is connected to a PLC . When I want to shut down the system , the fan will keep running for about 10 seconds to dissipate the heat from the heater battery and keep it healthy . PLC does everything automatic.

    The problem comes when I want to do it without the PLC , in Test Mode ,when the PLC is disconnected, How can I keep the fan working for about 10 seconds after the heater battery stops. .

    Thanks!
    talaniman's Avatar
    talaniman Posts: 54,325, Reputation: 10855
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    #2

    Jan 7, 2016, 08:02 AM
    Why are you disconnecting the PLC to run in test mode? Is this part of the instruction? Model and make of the air handler please.
    ChuckNorris's Avatar
    ChuckNorris Posts: 2, Reputation: 1
    New Member
     
    #3

    Jan 7, 2016, 09:14 AM
    Thanks for replying , I've asked for a data sheet.. but no lock yet . ...do you have a best case scenario ?
    talaniman's Avatar
    talaniman Posts: 54,325, Reputation: 10855
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    #4

    Jan 7, 2016, 01:29 PM
    Without instructions my guess is the fan doesn't need to run in test mode for the normal 10 seconds, but my puzzle remains as to WHY you disconnect the PLC to run a test without specific instruction to do so.

    The problem comes when I want to do it without the PLC , in Test Mode ,when the PLC is disconnected,
    Make and model numbers would help solve this quicker.

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