(Topic ID: 296514)

relay bank sequence "no coil"?

By n2012y

11 months ago



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  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 11 months ago by n2012y
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#1 11 months ago

I'm working on a 1957 Gottlieb "Silver." It uses two relay banks. In both banks there is a section identified as "sequence no coil." In both cases this section has a switch (or multiple switches) that have no coil activating them. I don't understand this at all. What's the point in having a switch that can't be activated?

#2 11 months ago

Have a good look at the trip relay banks in question. A "no coil" switch stack is usually activated by an arm attached to some of its neighboring switch stacks in the relay bank. An example might have a trip relay for the A, B and C targets and a "no coil" set of switches mounted between A and B (or B and C) trip relays that only trips once the other three have all tripped. It's a mechanical AND gate.

/Mark

#3 11 months ago

The no coil relay switch(s) is activated by an adjacent realy with a coil.

#4 11 months ago

Thanks for the help guys. Turns out when every relay trips, a bar drops down and activates the uncoiled switches.

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