I am trying to figure out how to use 2 changeover relays, 2 NC momentary pushbuttons and 2 NO pushbuttons to mimic a landing light. I know it is more practical to use a latching switch instead but this is just an experiment.
Can it be done? Any help would be appreciated.

 

For those of us who do not understand landing lights, what are landing lights and what kind of behavior do you want from them?

 

For those of us who do not understand landing lights, what are landing lights and what kind of behavior do you want from them?

It’s just a regular light that can be powered on and off by 2 switches. For e.g. a light that has a switch on the ground floor and the first floor

 

Do you mean something like this:

(I thought your question was related to aviation

 

Do you mean something like this:
View attachment 295383

Yes, I’m trying to replicate it using 2 changeover relays.

 

Can we assume the relay coils are rated for continuous operation, powered by mains voltage?
Are the relay contacts SPDT or DPDT ?

 

Yes, I’m trying to replicate it using 2 changeover relays.

Sorry. I probably wasn’t as clear as I thought

 

Can we assume the relay coils are rated for continuous operation, powered by mains voltage?
Are the relay contacts SPDT or DPDT ?

Yes, the relay coils are rated for continuous operation and is powered by mains voltage. The relays are DPDT

 

For those of us who do not understand landing lights, what are landing lights and what kind of behavior do you want from them?

Have you not heard the old joke about coming home to find an aeroplane at the top of your stairs?
Must have left the landing light on. . .

 

You only need one relay.
Below is the basic relay latching circuit:
The lamp, of course, is in series with the C-D set of contacts.

You would need to run two wires between floors for the push button connections.

Edit: Revised schematic to show both sets of pushbuttons.

 

Can it be done if you were to use 2 relays and 2 Normally Closed momentary Pushbuttons and 2 Normally Open pushbuttons?

 

Can it be done if you were to use 2 relays and 2 Normally Closed momentary Pushbuttons and 2 Normally Open pushbuttons?

Yes, but why would you want to use 2 relays when all you need is one?
(See my revised schematic in post #10)

 

You only need one relay.
Below is the basic relay latching circuit:
The lamp, of course, is in series with the C-D set of contacts.

You would need to run two wires between floors for the push button connections.

Edit: Revised schematic to show both sets of pushbuttons.

View attachment 295403

Yes, but why would you want to use 2 relays when all you need is one?

that’s a given brief. Which is 2 relays need using. Just using one relay would have been a lot easier in my opinion.

 

that’s a given brief.

Given by whom?
Is this homework?

 

Yes it is. I’m confused about adding the 2nd relay. i don’t know how to get it so that the light can be turned off using 1NC or 2NC.

 

 

My thoughts were the same, wondered what the application was?
Landing light to me are the double/horizontal bank of lights that a pilot uses when lining up his landing angle approach.
They indicate if coming in too low or too high, i.e. decent angle.

 

My thoughts were the same, wondered what the application was?
Landing light to me are the double/horizontal bank of lights that a pilot uses when lining up his landing angle approach.
They indicate if coming in too low or too high.

Apologies for the confusion

 

View attachment 295415

Thank you. Slightly confused about the grey though? Are they meant to indicate the NO contacts from the relay itself?

 

The gray line indicates that contact is associated with that particular relay coil.