Page 18 of 29 FirstFirst ... 811121314151617181920212223242528 ... LastLast
Results 222 to 234 of 375

Thread: out of ideas

  1. #222
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    19,573
    Quote Originally Posted by ChuckHVAC View Post
    I understand the principle that a full wave rectifier would not effect the sine wave because it uses both the upper and lower part of the wave.
    In actual practice the load is non-linear because it is actually switched by the diodes. Since the load is non-Linear, it alters the sine wave. Harmonics are created and the power factor can be lowered. The problem is increased when a capacitor, or other method is added on the output of the bridge rectifier (full wave) to smooth the voltage output because if you smooth the voltage you amplify the amperage variations. Here is a link which you might find interesting: http://en.wikipedia.org/wiki/Power_factor
    One aspect that I had not considered was the time period where the positive or negative diode pair were being forward-biased before the diodes begin to conduct. No doubt this it the reason for the harmonics and the non-linear nature of rectification. I imagine this was not much of a problem before the home computer revolution and the growth of fluorescent lighting.

    I found it interesting that the EU is requiring power factor correction. If a device can present a load that appears to be resistive, that is a good step for efficient power use.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  2. #223
    Join Date
    Jun 2001
    Location
    Michigan
    Posts
    12,077
    wow, the thread is still going strong. All I am saying and I don't know call me simple, is that when he wired up the 2nd or 3rd motor, I lost count, straight from out of the box with nothing on it. Fired it up, it was drawing higher amps than Full Load Amps.

    Something is wrong.

    And it has nothing to do with fan curves, static pressure, delta t's, humidity, heat, racism, sexuality, sexual orientation, drugs, world social order etc ect ect ect.

  3. #224
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,965
    Quote Originally Posted by Dowadudda View Post
    wow, the thread is still going strong. All I am saying and I don't know call me simple, is that when he wired up the 2nd or 3rd motor, I lost count, straight from out of the box with nothing on it. Fired it up, it was drawing higher amps than Full Load Amps.

    Something is wrong.

    And it has nothing to do with fan curves, static pressure, delta t's, humidity, heat, racism, sexuality, sexual orientation, drugs, world social order etc ect ect ect.
    It's the d**n Democrats.


  4. #225
    Join Date
    Jun 2001
    Location
    Michigan
    Posts
    12,077
    Quote Originally Posted by jpsmith1cm View Post
    It's the d**n Democrats.

    Too Funny.

    Obama said it was so.

  5. #226
    Join Date
    Jun 2001
    Location
    Michigan
    Posts
    12,077
    we better be careful JP or they will send this whole post to ARP

  6. #227
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,965

  7. #228
    Join Date
    Mar 2008
    Location
    NY NY
    Posts
    181
    Local 30 New York, New York Operating Engineer

  8. #229
    Join Date
    Mar 2007
    Location
    State of Confusion
    Posts
    1,210
    naa... everyone knows its Bush's fault..

  9. #230
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    Quote Originally Posted by Dowadudda View Post
    wow, the thread is still going strong. All I am saying and I don't know call me simple, is that when he wired up the 2nd or 3rd motor, I lost count, straight from out of the box with nothing on it. Fired it up, it was drawing higher amps than Full Load Amps.

    Something is wrong.

    And it has nothing to do with fan curves, static pressure, delta t's, humidity, heat, racism, sexuality, sexual orientation, drugs, world social order etc ect ect ect.

    i think your underestimating the possibility that drugs may be involved with this particular problem

    JK



    .

  10. #231
    Join Date
    Dec 2009
    Location
    Hotlanta GA.
    Posts
    217
    OH MY GOD !!!! I have just spent the last hour readiing this tread, and ALL its attachments, My ruling is this : (now listen up I know what I am doing)
    1: I need soem drugs...
    2: I really look at a motor diferently now......
    3: I will NEVER bench test a motro I am not ready to pay fer.....
    4: ALL fans are not created equall......
    5: I will never have a motro driven pool cover, heck I'll never have a pool .........
    6: Avita (the movie) is the best thiing thats touched my life .........
    7: I "WILL" always ask my dumb questions here, (ya knwo the kind every one says its better to ask then keep it inside .........
    8: Alls fair in love and troubleshooting ................

    Finaly, this: we ALL are sittin here wondering what the problen is, this one post stired so many to the edge of thier seats, and yet today we still sit, poised for any information as to the resulve of the fan motor (s) from hell.

    I am a humble man, and have learned over my years to sit and ponder, I LOVE to ponder, boss comes into the mach. room me sitin lookin at a down unit and he ask, whats ya doin, I say I'm ponderin.......... Ponderin goes a long ways.....


    I'm sure this situatuation will get resolved, more then likly not by me, and yet I know it WILL get resolved....... The unit ran before, it will run again. All I ask is who ever gets the thiing to run again, PLEASE you MUST return here and allow us the peace of mind to sleep again........ fro this one will go into the books for sure.....

    Thnak you .......

    OH by the way, its obeveus to me the Framastat is the culprate !! always is ......

  11. #232
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,534
    Quote Originally Posted by Mongo and me View Post
    OH MY GOD !!!! I have just spent the last hour readiing this tread, and ALL its attachments, My ruling is this : (now listen up I know what I am doing)
    1: I need soem drugs...
    2: I really look at a motor diferently now......
    3: I will NEVER bench test a motro I am not ready to pay fer.....
    4: ALL fans are not created equall......
    5: I will never have a motro driven pool cover, heck I'll never have a pool .........
    6: Avita (the movie) is the best thiing thats touched my life .........
    7: I "WILL" always ask my dumb questions here, (ya knwo the kind every one says its better to ask then keep it inside .........
    8: Alls fair in love and troubleshooting ................

    Finaly, this: we ALL are sittin here wondering what the problen is, this one post stired so many to the edge of thier seats, and yet today we still sit, poised for any information as to the resulve of the fan motor (s) from hell.

    I am a humble man, and have learned over my years to sit and ponder, I LOVE to ponder, boss comes into the mach. room me sitin lookin at a down unit and he ask, whats ya doin, I say I'm ponderin.......... Ponderin goes a long ways.....


    I'm sure this situatuation will get resolved, more then likly not by me, and yet I know it WILL get resolved....... The unit ran before, it will run again. All I ask is who ever gets the thiing to run again, PLEASE you MUST return here and allow us the peace of mind to sleep again........ fro this one will go into the books for sure.....

    Thnak you .......

    OH by the way, its obeveus to me the Framastat is the culprate !! always is ......
    9. i will never use my spell check!

    "If you pull one more stunt like you just pulled with Tommy, you won't have to get on a plane because I will personally kick your ass from here to Korea!" - Best of the Best

  12. #233
    Join Date
    Dec 2009
    Location
    Hotlanta GA.
    Posts
    217
    picky, piky, pikky, dats what I love about dis stuff. Get knwo me, I;m a feild man 100% all da way !!! You should see my tool box !!

    OH GOD is that an openign, man I got a stop myself !!!

  13. #234
    Join Date
    May 2007
    Location
    San Francisco
    Posts
    258
    In a sea of technicians (and technician accessories, ie: managers and dispatchers and what not), I think Mongo and me has the right attitude. Can't take it all so seriously

Page 18 of 29 FirstFirst ... 811121314151617181920212223242528 ... LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event