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(Topic ID: 323302)

Why is the System 11 A/C relay called "A/C"?

By BrianMadden

1 year ago



Topic Stats

  • 7 posts
  • 6 Pinsiders participating
  • Latest reply 1 year ago by PINTEC
  • Topic is favorited by 1 Pinsider

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    #1 1 year ago
    OP
     
    BRI

    BrianMadden

    FAST Pinball

    US Seattle, WA

    10y 55,700 170 9

    Here's a totally random question for the old-timers here that I've been wondering for decades:

    In a System 11 machine, why is the A/C relay called "A/C" relay? I understand the function, but the name is confusing since people think "A/C" as alternating current or somehow related to AC power.

    So why A and C? Why not A and B? Did they have names? Alternate side and constant side? (Though the constant / default side is A and the temporary active side is C).

    Any ideas or (crazy or real)?

    Just curious!
    Brian

    Post last edited 1 year ago: “typos”

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    #2 1 year ago
     
    237

    slochar

    Pinside member

    7y 86,550 6,915

    Always on
    Controlled

    That's a guess anyway

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    #3 1 year ago
     
    FNG

    DumbAss

    Pinside+ Frequent

    9y 109K 2,984

    Possibly to avoid ambiguity with 8. "B" and "8" look awfully similar.

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    #4 1 year ago
     
    QRK

    Deez

    Pinside+ Frequent

    12y 139K 6,785 13

    Probably because the relay can be configured for either form A or form C contacts.

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    #5 1 year ago
     
    ^^^

    PINTEC

    Pinside member

    US Chicago, IL

    6y 51,550 513

    Auxiliary Control relay.

    A side and Control side.

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    #6 1 year ago
     
    AMS

    barakandl

    nvram.weebly.com

    12y 132K 10,420

    I had thought they where defining the relay pins A B and C. B being the operating contact pin that moves.

    spdt-relay-switch (resized).pngspdt-relay-switch (resized).png

    I think Sega calls it left and right side. Solenoid 5L or 5R.

    A side and control side makes sense.

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    #7 1 year ago
     
    ^^^

    PINTEC

    Pinside member

    US Chicago, IL

    6y 51,550 513

    Follow up:

    A Circuit and C circuit

    A circuit for obvious reason, C circuit could been chosen to represent controlled

    The manual solenoid chart could be Sometimes Labeled Controlled or Switched or the same driver depending on the manual.

    AC (resized).pngAC (resized).pngNote (resized).pngNote (resized).png

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