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

    #1 1 year ago

    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!

    #2 1 year ago

    Always on

    That's a guess anyway

    #3 1 year ago

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

    #4 1 year ago

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

    #5 1 year ago

    Auxiliary Control relay.

    A side and Control side.

    #6 1 year ago

    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.

    #7 1 year ago

    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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