How to wire the intermediate relay power supply in the electronic component knowledge book?

According to the function of electromagnetic valves in the protection circuit, electromagnetic valves can be divided into starting relays, measuring solenoid valves, time controllers, signal relays, outlet solenoid valves, and intermediate relays.

The structure and principle of the intermediate relay are basically the same as those of the DC contactor. The important difference from a contactor is that the main contactor of the contactor can pass through a large current, while the contactor of the intermediate relay can only rely on a small current. Therefore, it is only applicable to control circuits. Due to its low overload capacity, there is generally no main contact. Therefore, it uses a large number of auxiliary contacts. The new national standard definition for intermediate relays is K, while the old national standard is KA. Generally, DC power supply is used, with a few using AC power supply.

Intermediate relay structure

1. Install the coil to "" U On the shaped magnet, there is a movable armature on the magnet, and there are two rows of contact springs on both sides of the magnet. The contact springs support the armature upwards in a non operating state, maintaining a certain gap between the armature and the magnet. When the electromagnetic torque between the magnetic densities exceeds the recoil torque, the cohesion is sucked into the magnet, and the cohesion pressure contact spring closes the normally closed point, completing the operation of the solenoid valve. When the electromagnetic torque decreases to a certain value, Due to the recoil torque of the contact spring, the contact and cohesion return to their original position, preparing for the next work.

2. The "U" shaped magnetic conductor of this solenoid valve adopts a dual iron core structure, which means that the coil can be placed on two side pillars. The DZY, DZL, and DZJ types only have one coil installed, but for DZB, DZS, and DZK types, they can be used on another iron core as needed to maintain the coil or delay the damping plate. Therefore, different types of coil solenoid valves generally have one magnetic conductor.

3. The principle of the intermediate relay is the same as that of a DC contactor, consisting of a fixed iron core, a moving iron core, a torsion spring, a moving contact point, a static contact point, a coil, wiring terminals, and a shell.

The efficacy of intermediate relays

1. Replace small contactors

The contact point of the intermediate relay has a certain load capacity. When the load volume is relatively small, it can be used to replace small contactor applications, such as the control of electric Roller shutter and some small appliances. This advantage not only allows for effective operation, but also saves space and makes the operating part of the appliance more refined.

2. Increase the number of contacts

This is the most commonly used use of intermediate relays. For example, in a circuit control system, the contact point of a contactor needs to control multiple contactors or other components, but instead adds an intermediate relay to the circuit.

3. Increase contact volume

We know that although the contact volume of the intermediate relay is not very large, it also has a certain load capacity and the required current for driving is also very small, so the intermediate relay can be used to expand the contact volume. For example, sensors and transistors typically cannot be directly exported to control electrical components with high loads. On the contrary, intermediate relays are applied to control circuits, adjusting other loads based on the intermediate relay to expand operating capacity.

The working principle of relay appliances

The coil of the intermediate relay is installed on a U-shaped magnet. There is an armature on the magnet. The magnet is equipped with two rows of contact plates on both sides. Under non dynamic conditions, support the armature upwards to maintain a certain gap between the armature and the magnet. When the electromagnetic torque between magnetic densities exceeds the recoil torque, the armature is sucked into the magnet. At the same time, the armature presses the contact spring to disconnect the normally closed point and close the normally open contact point, achieving signal transmission.

Intermediate relay wiring

Different relay wiring methods may vary. The following is the wire connection method for 8 wiring terminals.

5 and 6 are a pair of common terminals, 1 and 2 are a pair of normally closed points, and 3 and 4 are a pair of normally open points. 7. When 8 is not powered on, 5-6 and 1-2 are connected, 1-2 is disconnected, 5-6 is continuous, and 3-4 is connected.

Generally, the intermediate relay is a double pole double throw switch. The 7-8 ends are connected to the internal coil, and the Flyback diode is connected when applied. The polarity of the diode connection is opposite to that of the solenoid valve terminal (8 connected to the negative stage of the secondary tube, 7 connected to the positive stage of the secondary tube). When the predetermined value is reached, the solenoid valve will disconnect the working driving circuit. At that moment, due to self induced voltage, the current will flow through the secondary transistor instead of the circuit, thereby protecting the components in the circuit.

Select intermediate relay

1. Consider contact volume: maximum voltage (rated current) and current allowed to pass through;

2. Select the total number and type of contacts as needed;

3. The voltage level of the magnetic coil is the same as the power current of the control circuit;

4. The operating frequency of the solenoid valve;

5. Electromagnetic valve system wage system;

6. Objective factors such as usage environment and climate;

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