How to connect additional relays
Relays are commonly used components in electrical control systems and are used to control high voltage or high current circuits. Proper wiring is key to ensuring proper functioning of the relay. This article will introduce the wiring method of the relay in detail and provide relevant data for reference.
1. Basic structure of relay
Relays are mainly composed of coils, contacts, armature and other parts. When the coil is energized, a magnetic field is generated, which attracts the armature to move, thereby changing the state of the contact.
| parts | Function |
|---|---|
| Coil | A magnetic field is generated when electricity is applied |
| Normally open contact | The coil is open when it is not energized and closed when it is energized. |
| Normally closed contact | The coil is closed when it is not energized and is open when it is energized. |
| Public end | Common terminal of contacts |
2. Relay wiring steps
1.Determine relay pin: The pin arrangement of relays of different models may be different, please refer to the manual or measure to confirm.
2.Connect control circuit: Connect the positive and negative poles of the control power supply to the coil pins of the relay respectively.
| pin | Connection method |
|---|---|
| Coil positive | Connect the positive pole of the control power supply |
| Coil negative pole | Connect the negative pole of the control power supply |
3.Connect load circuit: Connect the positive terminal of the load power supply to the common terminal of the relay, and connect the other terminal of the load to the normally open or normally closed contact of the relay.
| Contact type | Connection method |
|---|---|
| Normally open contact | The coil closes after energizing and is used to control load energization. |
| Normally closed contact | The coil is disconnected after being energized to control load power-off. |
4.Check wiring: Make sure all wiring is firm and correct to avoid short circuit or poor contact.
3. Common relay wiring examples
1.control light bulbs: Use the normally open contact of the relay to control the light bulb on and off.
| Wiring steps | Description |
|---|---|
| 1 | Connect control power to coil pins |
| 2 | Connect the positive terminal of the bulb power supply to the common terminal |
| 3 | Connect the other end of the bulb to the normally open contact |
2.Control motor: Use the normally closed contact of the relay to realize the power-off protection of the motor.
| Wiring steps | Description |
|---|---|
| 1 | Connect control power to coil pins |
| 2 | Connect the positive terminal of the motor power supply to the common terminal |
| 3 | Connect the other end of the motor to the normally closed contact |
4. Precautions
1.Voltage matching: Make sure the relay coil voltage is consistent with the control power supply voltage.
2.Current matching: The rated current of the relay contacts must be greater than the load current.
3.Anti-reverse connection: Reverse connection of the coil may cause damage to the relay, please pay attention to the polarity.
4.Heat dissipation: When working with a large current load, the relay may generate heat, so ensure good heat dissipation.
5. Summary
Correct wiring is the basis for the normal operation of the relay. Through the introduction of this article, you should have mastered the basic methods of relay wiring. During actual operation, be sure to refer to the relay manual and ensure safe operation.
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