Electronics > Projects, Designs, and Technical Stuff
Need some help building a circuit involving switchs and relays
<< < (7/14) > >>
Shaydzmi:
There is nothing else other than this board. This is how I see it :
Renate:
I agree with @Shaydzmi on the interpretation.
(I had mentioned the "sandbox" power resistors only in passing, the ones I care about were the 1/2W 3.3k)

So, we went looking for a current sensor and we found something that is a 24 VAC voltage sensor.

So, being more exact, 24VAC * sqrt(2) = 34 VDC - 1V (led drop) = 33 VDC  / 3.3k = 10 mA - (1V / 470 ohm) = 8 mA

This seems peculiarly designed for a voltage source, not a current transformer.
It would have to be a very small ratio transformer to get 10 mA out of a 50 mA main current, or?
Renate:
Are you quite sure that the thread-out switches are not actually double pole, DPST?

I say that they are double pole.
The cable that runs along the feeder bar is two conductor.
It has 24 VAC supply and the common alarm.
The feeder connects in with insulation piercing to the two conductors.
The chassis provides return.

Am I wrong?
Shaydzmi:

--- Quote from: Renate on May 27, 2020, 04:54:23 pm ---Are you quite sure that the thread-out switches are not actually double pole, DPST?

I say that they are double pole.
The cable that runs along the feeder bar is two conductor.
It has 24 VAC supply and the common alarm.
The feeder connects in with insulation piercing to the two conductors.
The chassis provides return.

Am I wrong?

--- End quote ---

You are absolutely right, and because of that I put two separated circuits 1 and 2.

This does not change any thing in our problem.
Renate:

--- Quote from: Shaydzmi on May 27, 2020, 07:03:10 pm ---This does not change any thing in our problem.
--- End quote ---
Well, some of this information should have been in the first post.
Your schematic does not show any of this.

Was the goal to switch to current sensing?
How are you even sure that there are bulb bypass resistors? What is their value?
Why would you think that current monitoring would be more reliable than the existing voltage bus?
Is there a problem with the existing boards? With the second poles of the thread-out switches?
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod