How This Heater get ON and OFF

  • Thread starter ismat143
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1.jpg

1.If i apply voltage 440volts at L1,L2,L3 the K3 (contactor) will get on automatically?
2.How this SSR work and what should be the voltage at 4,5,6 and 7,8,9(X1 terminals)?

The main thing i want to ask is how this heating 1 and heating 2 gets ON and OFF and at what voltage?

Thank you.
 

dlgoff

Science Advisor
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Welcome to PF ismat. It looks like the heaters are being controlled by SSR (which is a silicon controled rectifier, I think) and its ouput is controlled by pluses supplied to the + and - terminals. These pulses could be coming from a PID controller. And K3 appears to be contacts for a relay. Are there other parts of the circuit you are not showing?

The voltage at 4,5,6 is just your 440V line voltage. The voltage at 7.8.9 will be pulsed 440V.
 

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