Heating Circuit troubleshooting

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Discussion Overview

The discussion revolves around troubleshooting a heating circuit that includes a microcontroller, a solid-state relay (SSR), and heaters. Participants are exploring issues related to the relay's activation and the circuit's functionality when the temperature reaches a cutoff point.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant describes a problem where heaters do not stop when the temperature reaches the cutoff, raising questions about the circuit's design and functionality.
  • Concerns are expressed about the potential low output from the microcontroller not being sufficient to activate the SSR relay, which is rated for 0-5 V logic.
  • Another participant points out a possible misconnection in the circuit, suggesting that the line and neutral should not be connected to the SSR in the manner described, as it could create a short circuit.
  • There is a request for a schematic to clarify the connections and assist in troubleshooting.
  • One participant offers to provide a schematic but expresses uncertainty about the connections and the relay type being used.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the correct wiring of the SSR or the cause of the issue. Multiple competing views regarding the circuit design and the functionality of the relay remain unresolved.

Contextual Notes

Participants express uncertainty about the connections and the specifications of the SSR being used, which may affect the troubleshooting process. There are also indications of a lack of clarity in the original circuit diagram provided.

Who May Find This Useful

Individuals working on circuit design involving microcontrollers and solid-state relays, particularly those troubleshooting similar heating circuits or seeking guidance on SSR connections.

abhipatel
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Needed some guidance for my circuit:

Have a circuit consisting of a microcontroller + SSR relay + load (heaters)...issue is when the temperature reaches cutoff the heaters are not getting stopped and temp. keeps on increasing...

I have a connection of outputs from microcontroller into points 3 and 4 of the relay...all lives into point 1 and all neutrals into point 2.

Have tried to measure potential difference between points 3 and 4 and it shows in Millivolts? Another thing is the relay LED light does not come on...is it because the output is too low (relay is 0-5 V logic) or could it be that the relay is bad?

Am scratching my head as I do not want to order another relay if it is not the problem...is it my circuit or my relay or is my controller not giving enough o/p in DC to activate the relay?
 
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abhipatel said:
Needed some guidance for my circuit:

Have a circuit consisting of a microcontroller + SSR relay + load (heaters)...issue is when the temperature reaches cutoff the heaters are not getting stopped and temp. keeps on increasing...

I have a connection of outputs from microcontroller into points 3 and 4 of the relay...all lives into point 1 and all neutrals into point 2.

Have tried to measure potential difference between points 3 and 4 and it shows in Millivolts? Another thing is the relay LED light does not come on...is it because the output is too low (relay is 0-5 V logic) or could it be that the relay is bad?

Am scratching my head as I do not want to order another relay if it is not the problem...is it my circuit or my relay or is my controller not giving enough o/p in DC to activate the relay?

Would it be possible for you to post a schematic?
 
Am not much of an electrical guy but here it is in Word...see if it helps.
 

Attachments

abhipatel said:
Am not much of an electrical guy but here it is in Word...see if it helps.

I'm not understanding your connections. You would not put Line in one pin and Neutral in the other on the SSR. That would short Line to Neurtal when the SSR was turned on. You would run Line through the relay, then through the load to Neutral.

What SSR are you using? Is it opto-isolated?

http://en.wikipedia.org/wiki/Solid_state_relay

.
 
Could you please help me in figuring how to run Line through the relay, then through the load to Neutral in the form of a schematic or maybe just edit my diagram?...

I am still scratching my head and resorting to trial and errors...Thanks
 
This is a suggestion.
 

Attachments

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