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    namus's Avatar
    namus Posts: 3, Reputation: 1
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    #1

    May 9, 2007, 02:01 PM
    Alternating compressors
    Hi there everybody, this is my problem' I have two 3 phase 10 hp compressors connected to one air tank, each compressor is on its own circuit and its own pressure switch at the moment only one compressor comes on because of the pressure switch, I’ve tried adjusting the other one to get it the same but it's to hard, what I need for each compressor to come on alternately, thanks
    Namus
    caibuadday's Avatar
    caibuadday Posts: 460, Reputation: 10
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    #2

    May 9, 2007, 02:32 PM
    Quote Originally Posted by namus
    Hi there everybody, this is my problem' I have two 3 phase 10 hp compressors connected to one air tank, each compressor is on its own circuit and its own pressure switch at the moment only one compressor comes on because of the pressure switch, I’ve tried adjusting the other one to get it the same but it's to hard, what I need for each compressor to come on alternately, thanks
    Namus
    You need an alternator, the pressor switch control it
    namus's Avatar
    namus Posts: 3, Reputation: 1
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    #3

    May 9, 2007, 08:24 PM
    Quote Originally Posted by caibuadday
    you need an alternator, the pressor switch control it
    Is that what I ask for at the wholesale house?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #4

    May 9, 2007, 09:52 PM
    One simple method is to wire in an alternating relay such as the one shown here:
    Grainger Industrial Supply: Relay,Alternating 6C052

    Which will need to be connected into the control wiring of both motor starters/contactors.
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