Phase Chopping or Phase Cut Control

Discussion in 'HVAC' started by Fred, Jan 19, 2007.

  1. Fred

    Fred Guest

    Hi Group!

    Wondering if anyone can give a brief explanation of "phase cut" or "phase
    chopping" control. Just ran across this in a brochure for a Honeywell
    controller and haven't heard of it before.

    TIA

    Happy New Year to all!

    Fred


    --
    Drop news in sig to reply.

    ~The secrecy of my job prevents me from knowing what I'm doing~
     
    Fred, Jan 19, 2007
    #1
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  2. Fred

    Bubba Guest

    On Fri, 19 Jan 2007 18:54:49 GMT, "Fred" <> wrote:

    >Hi Group!
    >
    >Wondering if anyone can give a brief explanation of "phase cut" or "phase
    >chopping" control. Just ran across this in a brochure for a Honeywell
    >controller and haven't heard of it before.
    >
    >TIA
    >
    >Happy New Year to all!
    >
    >Fred


    Spent a whole lot of time on Google there did ya Freddy?
    Bubba
     
    Bubba, Jan 19, 2007
    #2
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  3. Fred

    Fred Guest

    Hey Bubba!

    As a matter of fact I did...couldn't find much of an explanation.

    Want to recommend a good link?


    "Bubba" <> wrote in message
    news:...
    > On Fri, 19 Jan 2007 18:54:49 GMT, "Fred" <> wrote:
    >
    >>Hi Group!
    >>
    >>Wondering if anyone can give a brief explanation of "phase cut" or "phase
    >>chopping" control. Just ran across this in a brochure for a Honeywell
    >>controller and haven't heard of it before.
    >>
    >>TIA
    >>
    >>Happy New Year to all!
    >>
    >>Fred

    >
    > Spent a whole lot of time on Google there did ya Freddy?
    > Bubba
     
    Fred, Jan 20, 2007
    #3
  4. Fred

    Tekkie® Guest

    Fred posted for all of us...

    >
    > As a matter of fact I did...couldn't find much of an explanation.
    >
    > Want to recommend a good link?
    >

    Try PHASE +CHOPPING
    --
    Tekkie Don't bother to thank me, I do this as a public service.
     
    Tekkie®, Jan 20, 2007
    #4
  5. Fred

    Bubba Guest

    Hey Fred,
    No, but thanks for asking.
    I usually do my own homework. Try Yahoo, Msn, etc.
    Bubba

    On Sat, 20 Jan 2007 01:08:49 GMT, "Fred" <> wrote:

    >Hey Bubba!
    >
    >As a matter of fact I did...couldn't find much of an explanation.
    >
    >Want to recommend a good link?
    >
    >
    >"Bubba" <> wrote in message
    >news:...
    >> On Fri, 19 Jan 2007 18:54:49 GMT, "Fred" <> wrote:
    >>
    >>>Hi Group!
    >>>
    >>>Wondering if anyone can give a brief explanation of "phase cut" or "phase
    >>>chopping" control. Just ran across this in a brochure for a Honeywell
    >>>controller and haven't heard of it before.
    >>>
    >>>TIA
    >>>
    >>>Happy New Year to all!
    >>>
    >>>Fred

    >>
    >> Spent a whole lot of time on Google there did ya Freddy?
    >> Bubba

    >
     
    Bubba, Jan 20, 2007
    #5
  6. Fred

    Bubba Guest

    On 20 Jan 2007 21:47:22 GMT, DANgER () wrote:

    >O God run, bubba trying to answer electrical questions!
    >
    >bubba is a dumb shit!
    >
    >-Canadian Heat


    Hey, whats up $100 Canadian trailer billy?
    Your not still molesting your daughters in there, are you?
    Bubba
     
    Bubba, Jan 20, 2007
    #6
  7. Fred

    Oscar_Lives Guest

    "DANgER" <> wrote in message
    news:45b2919a$0$3962$...
    > "Hey, whats up $100 Canadian trailer billy? - bubba"
    >
    > Wow that insult has me speechless!
    >
    > I have nothing to hide bubbs! post your pic and bank statements...I would
    > love to compare lives. Let the forum vote, most pathetic has to leave...
    > got
    > balls bubbs? I have more money in my dirty laundry then you have in the
    > bank
    > old man!
    >
    > That's what I thought!!! No balls bubbs!
    >
    > -Canadian Heat


    Don't do it, Bubba! That Canuck money isn't worth much, and his large
    number of dollars will appear to be bigger than yours.
     
    Oscar_Lives, Jan 20, 2007
    #7
  8. Fred

    Bubba Guest

    On 20 Jan 2007 22:03:06 GMT, DANgER () wrote:

    >"Hey, whats up $100 Canadian trailer billy? - bubba"
    >
    >Wow that insult has me speechless!
    >
    >I have nothing to hide bubbs! post your pic and bank statements...I would
    >love to compare lives. Let the forum vote, most pathetic has to leave... got
    >balls bubbs? I have more money in my dirty laundry then you have in the bank
    >old man!
    >
    >That's what I thought!!! No balls bubbs!
    >
    >-Canadian Heat


    You need to be pinched and wake up. Its all a dream. And the only
    thing you have in your dirty laundry is shit streaks in your shorts.
    Try "Depends" you fat ****.
    Bubba
     
    Bubba, Jan 20, 2007
    #8
  9. Fred

    Fred Guest

    Hey James!

    Thanks for taking the time...now I'm more curious about this particular
    control scheme. I'm familiar with scr/triac control for regulating output
    power...to a lamp or fan motor for example...but haven't seen this used on
    24VAC control circuits.

    Are there controllers that use this phase cut/chopping scheme for control at
    24V AC??

    Fred
    "James" <> wrote in message
    news:39ysh.13587$...
    >I suspect it is refering to an scr style speed control. You phase shift
    >the signal a little and use it to drive the scr. The scr turns on partway
    >through the sine wave. Src's turn them selves off when the sine wave
    >passes 0. Then you signal it again part way through the next sine wave.
    >The result is a partial sine wave that gives you a lower effective rms
    >voltage because you have a longer period at 0 volts.
    >
    > "Fred" <> wrote in message
    > news:Zt8sh.714438$R63.569358@pd7urf1no...
    >> Hi Group!
    >>
    >> Wondering if anyone can give a brief explanation of "phase cut" or "phase
    >> chopping" control. Just ran across this in a brochure for a Honeywell
    >> controller and haven't heard of it before.
    >>
    >> TIA
    >>
    >> Happy New Year to all!
    >>
    >> Fred
    >>
    >>
    >> --
    >> Drop news in sig to reply.
    >>
    >> ~The secrecy of my job prevents me from knowing what I'm doing~
    >>

    >
    >
     
    Fred, Jan 21, 2007
    #9
  10. Fred

    Mo Hoaner Guest

    "James" <> wrote in message
    news:VAVsh.13883$...
    >I have not personally seen any but the principle is the same. The voltage
    >doesn't matter as long as it is ac. In fact I suspect a regular 115 lamp
    >dimmer would work on 24 volt.
    >

    It won't. There's a device called a diac in a light dimmer that is the
    mechanism behind triggering the triac at the proper point of each AC cycle.
    The breakover voltage of the device is chosen based on the design voltage of
    the dimmer. At 24 volts, you might be lucky to get a very small range of
    functionality.
     
    Mo Hoaner, Jan 22, 2007
    #10
  11. Fred

    Fred Guest

    Mo has a point there...most diacs in dimmer switches don't "break over"
    until the voltage reaches around 30V. Wouldn't work on a 24VAC circuit.

    Fred
    "James" <> wrote in message
    news:pi3th.13060$...
    > How does the control vary the breakover point?
    >
    > "Mo Hoaner" <> wrote in message
    > news:2wWsh.1674$...
    >>
    >> "James" <> wrote in message
    >> news:VAVsh.13883$...
    >>>I have not personally seen any but the principle is the same. The
    >>>voltage doesn't matter as long as it is ac. In fact I suspect a regular
    >>>115 lamp dimmer would work on 24 volt.
    >>>

    >> It won't. There's a device called a diac in a light dimmer that is the
    >> mechanism behind triggering the triac at the proper point of each AC
    >> cycle. The breakover voltage of the device is chosen based on the design
    >> voltage of the dimmer. At 24 volts, you might be lucky to get a very
    >> small range of functionality.
    >>

    >
    >
     
    Fred, Jan 23, 2007
    #11
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