How solid state relays control heaters
Solid state relay only need 3-32V voltage can be, so the choice of table when you choose to control the solid state relay temperature control table (I have bought a relay output, that is, the table is only the switch action without voltage. No way no switching power supply. And finally with two large batteries in series to switch through the table to control the action, the results are the same effect). Very simple, no difference with the contactor. Difference: solid state relay current below 60A can be used three-phase integral, if it is a large current can be a single phase (to buy three), and the control line can be connected in parallel. Remember that the current state of the solid state relay is 2.5-3 times the actual current. Small current for the radiator heat, high current fan + radiator cooling, and even water-cooled. There is a solid state relay and leakage current phenomenon, with a multimeter to measure the resistance will find is not conductive, and one end of the voltage (no control of the case) but found the other end (no heat resistance, floating state) voltage and 220V The This is normal ha! This is also the actual experience: large current leakage will be more serious, small will be smaller. Do not be afraid to use the rest assured. --------------- do not take my opinion really want to injustice me ha! Ha ha
Simply say that a temperature controller connected to the temperature sensor set the parameters, the output signal to the solid on it. Now the market is generally the whole machine contains the cycle controller. Give you a simple circuit, hope to help you.
Solid State Relay Control Heater Method:
Temperature is generally below 100 degrees, you can use PT100 as a temperature acquisition. Signal back to the PLC, if it is about 1000 degrees using thermocouple. After the temperature is set to set the PLC parameters, such as: 30 degrees heating, 90 degrees stop. In the PLC signal command output termination solid state relay control control terminal, resistance wire connected solid state relay main circuit. 8 by 332 points under the average point just like. There is a solid-state relay model, the current should be large enough, the normal working current of the resistance wire and start the cold current is different, need to choose a little bigger.
Solid state relay is a non-contact electronic switch, by the discrete components, membrane fixed resistance network and chip, the use of mixed process assembly to achieve the control circuit (input circuit) and the load circuit (output circuit) of the electrical isolation and signal coupling Solid-state devices to achieve load on-off switching function, the internal without any moving parts.
