topic Re: Simple schematic question in Fusion Electronics Forum

Simple schematic question

Etbrown44 — Sun, 17 Aug 2025 00:57:04 GMT

I've connected this simple time delay relay before, but need a tip this time as I'm not getting output.
I have 110v supplied to A1 and A2. I read nothing on 15,16 or 18, even after time delay has passed. It is a "delay on" relay.
I have 2 of these relays. One new. Both unlikely to be defective, so has to be operator error!
Suggestions most welcome.

Re: Simple schematic question

paullevene — Mon, 18 Aug 2025 19:40:55 GMT

You’re almost there, the trick on this model is that it needs a separate control input (S) to start the timing. Powering A1–A2 alone won’t make the relay change state, and the terminals 15/16/18 are just a dry change-over contact (no voltage appears there unless you feed one in).

Quick bench test / wiring

Supply: L → A1, N → A2 (110 VAC).
Trigger: Link A1 to S (ideally through a switch). This applies the control signal that starts the “delay-on” timing.
Output: Feed the voltage you want to switch into 15 (e.g., L).
- At rest you should have continuity 15–18 (NC) and open 15–16 (NO).
- After S is energised and the set delay expires, the relay clicks and you get continuity 15–16 (and L will appear on 16 if you fed L into 15).

If you don’t hear a click:

Make sure the function is set to delay-on and the time range isn’t set to hours (set the shortest range and a small time first).
Verify you actually have ~110 VAC across A1–A2.
Try momentarily removing and re-applying S to give it a clear rising edge.

Safety note: 110 VAC can bite—double-check isolation before probing.

Do the above and you should see the output behave.

Re: Simple schematic question

Etbrown44 — Mon, 18 Aug 2025 20:12:07 GMT

I was just asking if this relay provided a 110v output, and I see it just makes or breaks an isolated contact. Never needed S, as we just put 110v to a1 and a2.