How to use relays to control compressors
1、 Basic knowledge of relays
A relay is a type of switching device whose main function is to control an electrical circuit. Compared with directly connecting the power supply, the advantages of using relay control circuits are power isolation, equipment protection, increased transmission capacity, and improved system flexibility and reliability, making it an indispensable and important component in the field of modern electrical control.Click to obtain more relay knowledge
2、 Wiring and configuration of relays
Before selecting a relay, it is necessary to determine the rated current and voltage of the device to be controlled. Select the appropriate relay model based on these requirements. Before installing the relay, it is necessary to ensure that the wiring is correct when the circuit is powered on. When wiring, it is necessary to pay attention to maintaining the correct wiring terminals to avoid short circuits, overloads, or other safety issues.
3、 Control the compressor
Connect the power supply of the compressor
Connect the positive pole of the compressor power supply to the NO (normally open) terminal of the relay, and connect the negative pole of the compressor power supply to the COM (common) terminal of the relay. After the relay is triggered, the positive pole of the external power supply can be smoothly connected to the compressor pin, completing the control of the compressor.
Connect the positive pole of the compressor power supply to the NO (normally open) terminal of the relay, and connect the negative pole of the compressor power supply to the COM (common) terminal of the relay. After the relay is triggered, the positive pole of the external power supply can be smoothly connected to the compressor pin, completing the control of the compressor.
Set relay triggering conditions
The triggering conditions of the relay can be achieved by controlling the input terminal of the relay, such as using a temperature sensor to control the relay. When the temperature reaches the set value, the intelligent circuit integrated by the sensor will emit an electrical signal, trigger the relay, and connect the positive pole of the power supply to the compressor pin to start the compressor.
4、 Precautions
When using relays to control compressors, it is necessary to ensure that the rated power of the selected relay is large enough to withstand the load of the compressor and avoid overload damage.
When connecting the power supply of the compressor, it is necessary to ensure that the polarity of the power supply is correct to avoid safety issues.
When triggering the input terminal of the relay, it is necessary to ensure the correctness of the triggering conditions and triggering signals to ensure the normal operation of the compressor.
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