How Do Heater Contactors and SSRs Control Heating Elements?

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Heater control is achieved through contactors and solid-state relays (SSRs), with SSRs regulating output via pulses from a PID controller. When 440 volts is applied to L1, L2, and L3, the K3 contactor activates automatically. The voltage at terminals 4, 5, and 6 corresponds to the 440V line voltage, while terminals 7, 8, and 9 receive pulsed 440V. The discussion emphasizes the importance of understanding how heating elements are turned on and off based on these voltage inputs. Proper circuit configuration is crucial for effective heating control.
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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.
 
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Welcome to PF ismat. It looks like the heaters are being controlled by SSR (which is a silicon controlled 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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