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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. hedge.txt | Mostly Inactive, except when not‏ @hedgeberg 5 Apr 2018
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      hedge.txt | Mostly Inactive, except when not Retweeted Chris Maupin

      This thread is horror. @nanographs why would you show me this "outputting 400V relative to neutral" O_Ohttps://twitter.com/ChrisATX/status/981190462714400770 …

      hedge.txt | Mostly Inactive, except when not added,

      Chris Maupin @ChrisATX
      Dear isotope mass spec folks, I’m going to chronicle a sequence of your/my worst nightmares come true via twitter thread, as a teachable moment, and why you never panic. If you find this thread useful, please share it. Most of you have a much higher profile than myself. (1) pic.twitter.com/NrDhPLzoEx
      Show this thread
      1 reply 0 retweets 10 likes
    2. Nicolás Álvarez‏ @nicolas09F9 5 Apr 2018
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      Replying to @hedgeberg @nanographs

      I don't get it D:

      1 reply 0 retweets 0 likes
    3. hedge.txt | Mostly Inactive, except when not‏ @hedgeberg 5 Apr 2018
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      Replying to @nicolas09F9 @nanographs

      My understanding is they tried to convert their 120V 3 phase supply to 120V 1 phase, but when they did it they somehow messed it up and blew out stuff in the vacuum pumps? I'm not sure what you'd need to do to get 400V relative to neutral but it's p bad. Curious what blew out.

      1 reply 0 retweets 1 like
    4. Adam McCombs‏ @nanographs 5 Apr 2018
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      Replying to @hedgeberg @nicolas09F9

      If the center tap gets put in the wrong spot you can have a "lifted" transformer, thus getting correct voltage phase to phase but way too much potentiall to nutural.

      1 reply 0 retweets 1 like
    5. hedge.txt | Mostly Inactive, except when not‏ @hedgeberg 5 Apr 2018
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      Replying to @nanographs @nicolas09F9

      Oh duh i forgot that 3 phase was done with tapped transformers. So instead of 240 Vpp, they landed 120 Vpp by grabbing the wrong one of the 2 center taps on the output coil, yeah?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 5 Apr 2018
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      Replying to @hedgeberg @nanographs @nicolas09F9

      Standard European power (I saw German mentioned) is 3 phase, 230V phase to neutral, 400V phase to phase. You wire single phase loads phase to neutral, but it sounds like somehow that got mixed up with phase to phase.

      11:28 AM - 5 Apr 2018
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      • hedge.txt | Mostly Inactive, except when not
      3 replies 0 retweets 1 like
        1. Shiro‏ @ShiroKlein 5 Apr 2018
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          Replying to @marcan42 @hedgeberg and

          Nice Electrical Engineering

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        1. Shiro‏ @ShiroKlein 5 Apr 2018
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          Replying to @marcan42 @hedgeberg and

          Delta or Y type ?

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 5 Apr 2018
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          Replying to @ShiroKlein @hedgeberg and

          Y usually, with a real neutral. Pure 3 phase stuff can use delta style, but there's never any of that funny wild leg asymmetric neutral delta stuff.

          1 reply 0 retweets 2 likes
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        1. hedge.txt | Mostly Inactive, except when not‏ @hedgeberg 5 Apr 2018
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          Replying to @marcan42 @nanographs @nicolas09F9

          Yeah that makes more sense, I thought it was weird that the numbers weren't adding up and figured I was doing math wrong, should have figured i was thinking in the wrong space entirely.

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