Need help making a relay latch

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Qmavam
 
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Joined: Thu Feb 16, 2023 8:22 pm

Need help making a relay latch

Post by Qmavam »

I thought this would be simple and maybe the problem is I need a DPDT relay, But I don't have one available.
I have a relay that closes for 30 seconds then opens. It is a SPDT relay. I can retrigger the relay to run another 30 seconds.
I want to add a second latching relay with a reset.
When the 30 second runs out and the relay is set to the N.O. contacts, I want a buzzer to sound, I also want to be able to reset the latching relay to shut the Buzzer off and I want it to stay off until the next time the relay runs through a 30 second cycle and drops out to the N.O. contacts.

Long story short, I have a timer, I push start and it closes the relay N.O. contacts for 30 seconds, then the relay opens and the N.C. contacts are closed. When the N.C. contacts close, I want them to latch a relay with a reset button. Reset is to shut the buzzer off, while work is performed before the next 30 second cycle is triggered.
Thanks, Mikek

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