Introduction to Relays and Fans
A relay is a switching device that can control high power currents, and it can control high currents through low currents. Fans are widely used in the field of heat dissipation, which can help cool down devices such as circuit boards. Nowadays, many electronic devices come with their own fans, but sometimes additional fans are needed. In this case, the previous fan needs to be connected to a relay to control its switch.
Materials required for electric fan wiring relay
- Suitable relays should have parameters that meet the current and voltage requirements of the fan.
- There are several wires, and the appropriate diameter of high-temperature resistant wire should be selected according to the actual current.
- Wiring terminals or heat shrink tubing are used to connect wires.
- Tools such as screwdrivers and wire strippers.
Wiring steps for electric fan
Determine the operating voltage and current of the fan:
Understand the nameplate or instruction manual of the fan to clarify its operating voltage (such as 12V or 24V) and the required current value for normal operation. When selecting a relay, make sure it can withstand the current and voltage required by the fan.
Connecting the relay control circuit:
Firstly, it is necessary to determine the source of the control signal, which may come from devices such as switches, sensors, controllers, etc. Secondly, connect the positive terminal of the control signal to the control pin of the relay (usually one end of the coil) through wires and wiring terminals. Finally, connect the negative terminal of the control signal to the other end of the relay coil, which can usually be achieved by grounding or connecting to a suitable circuit.
Connect the fan power circuit:
Connect the positive power wire of the fan reliably to the normally open contact (NO) pin of the relay, which requires the use of wires and terminal blocks for connection. At the same time, connect the negative power cord of the fan to the negative or ground terminal of the power supply.
Connect relay power supply:
Connect the positive terminal of the relay coil power supply to the appropriate positive terminal of the power supply, which is usually the same as the fan power supply, but different power supplies can also be selected according to specific control requirements. At the same time, connect the negative terminal of the relay coil to the negative terminal or ground terminal of the power supply.
Check the connection status:
Verify that all connection points are secure and reliable, ensuring that the wires are connected correctly and there are no short circuits or open circuits. After confirming that the connection is correct, preliminary testing can be conducted. By triggering the control signal, observe whether the fan can start and stop normally.
Why connect the fan to the relay
1. Safety: Since relays handle more voltage and current, the current reaching the fan is more stable; hence, it raises the safety of the equipment.
2. Power saving: Since the relay can control the switch, the fan can be turned off when not needed; hence, power can be saved.
3. Convenient control: In fact, by using a relay to switch a fan on and off, control becomes quite convenient and the adjustment can be performed anytime in accordance with actual needs.
In short, equipment that can be better protected and generally improved in efficiency by connecting the fan to a relay. The above is the detailed introduction of connecting the fan to the relay. If you are still not understanding, you may look at the following video.