24 volt signal to 120 volts

[Tim B.]

I have a machine that runs off 120 volts. Installed a 24 volt transformer to power a photo sensor that detects bad parts. When bad part is detected a 24 volt signal is sent. How do i get that 24 volt signal to activate a 120 volt shutoff switch?

 

[roger]

A relay.

Roger

 

[MAC702]

Same thing we do in air conditioners. A 120/240 - to - 24 V transformer in the machine powers a remote 24 V thermostat. The thermostat switches the 24 V "signal," and a contactor (heavy load like compressor) or relay (light load like fan motor) back in the machine again then turns on the 120 V or 240 V portion.

Typical relay: https://smile.amazon.com/Emerson-90...gateway&sprefix=hvac+fan+relay,aps,199&sr=8-3

 

[Tim B.]

Thanks

Thanks

The Thermostat comparison really brought the concept home. Thanks very much.

 

[gar]

190530-1135 EDT

Tim B:

You have been provided the answer, but there may be more to consider.

What is the product made by the machine? How does a photodetector determine the part is bad? How quickly must the detection system work? Must the system latch into a tripped state? If latched, how is it to be reset? What are the safety implications?

How does the photodetector work? Obscuration or reflection? Reflection using a mirror can also be an obscuration type. Is the photodetector a two wire or more wires device? Does it work with AC excitation, or require DC? Is a light source required? What is the output switching device in the photodetector? And any other questions you think up.

.

 

[MAC702]

...How quickly must the detection system work? ...

I wasn't smart enough for the other questions, but that is one that came to my mind ,also.