In the integrated wiring project, there are a lot of parts that must be used, in addition to grasping the method of the integrated wiring system, the parts that must be applied for the integrated wiring system should also have a certain understanding. For example, what is a relay, solenoid valve and how to wire.

What is a relay

Solenoid valve (English name: relay) is a kind of electric control components, to be when the output (encouragement) of the change to do the specified requirements, in the electrical equipment to make the measured circuit to produce a set step change of a household appliance.

It has a communication link between the control system software (also known as the key-in control circuit) and the controlled system software (also known as the export control circuit). Generally used in automation control circuits, it is in fact a "control switch" to control high voltage operation with small current. Therefore, it plays a role in the circuit regulation, safety and protection, change circuit and other effects.

How to wire a solenoid valve

As the purpose of using the solenoid valve is to control the weak electricity with weak installation. (Contains low voltage control of high current, small current control of high voltage). The completion of the efficacy of the control of its own coil through the power off, so that it contacts through the power off. (Simply put, it is to control the magnet to attract or not to attract, and the magnet and then control the button switch)

Therefore, the connection of the solenoid valve also includes the connection of the contact point of its control circuit and the connection of the control coil.

The contact point of the intermediate relay has a certain load carrying capacity, when the load volume is more bell, can be used to replace small and medium-sized AC contactor applications, such as electric rolling doors and some small electrical control. The advantage of that is not only can have the effect of control, but also easy to use, so that part of the control of electrical appliances to do more exquisite.

This is also a more common use of intermediate relays, for example, in the circuit control system software, an AC contactor contacts must control several AC contactors or other components, but rather the power distribution line to add an intermediate relay. We all know that the contact volume of the intermediate relay, although not large, but also has a certain ability to carry loads, and at the same time to promote the required flow of electricity is not large, and therefore can use the intermediate relay to increase the contact volume.

For example, it is generally not possible to control electrical components with large loads directly with inductors and transistor leads. Instead, intermediate relays are used in the control of power distribution lines to control other loads according to the intermediate relay to achieve the purpose of expanding the control capacity.

In industrial production control power distribution lines, this situation often occurs, the control regulations need to use the AC contactor normally open and closed contacts to achieve the purpose of control, but the AC contactor itself with normally open and closed contacts have long been used, can not perform the control of the daily task.

At this time, an intermediate relay can be connected in parallel with the original contactor coil, and the normally open and closed contacts of the intermediate relay can be used to control the corresponding components, and the contact types can be changed to achieve the desired control purpose.

In some control of power distribution lines, some electronic components are often connected to the application of intermediate relays, with the contact of the switch to control, such as color TV or display screen in the commonly used automatic demagnetization circuit, transistor control intermediate relay conduction, in order to achieve the control of demagnetization coils off and on the effectiveness of.

Clear the impact in the circuit: in industrial production control or electronic computer control power distribution lines, although there are very many. The role of the intermediate relay is used to transmit data signals or control several circuits at the same time, can also be used directly to control the small volume motor or other electrical equipment control components, its structure and DC contactor is basically the same, only the electromagnetic system is smaller, more contact points.

How to select the solenoid valve

Thermal relay electrical components, I believe that many power engineering professionals and technicians are very well understood, the main function of the thermal relay is used in the motor control circuit, the motor or another to carry out over-voltage protection, when the circuit or machine equipment load failure occurs, the thermal relay will be cut off the circuit to achieve the maintenance effect.

Many beginners learn electrician master feel not easy, very easy to blind, the following we will be the simplest expression to understand the thermal relay, the key to take a look at how to determine the advantages and disadvantages of thermal relays?

The main parameters of the thermal relay: in simple terms there are three points, thermal element, normally open point NO and normally open and normally closed point NC, manual automatic calibration knob! When the circuit or machine equipment load failure occurs, the thermal element will also produce bending, can make the thermal relay normally open point NO closed, normally open normally closed point NC break, generally we use NO normally open point as a common fault alarm system, normally open normally closed point NC as a break control circuit applications! After the posture of the thermal relay, you can choose manual calibration or fully automatic calibration!

We judge the advantages and disadvantages of thermal relays are also mainly through the above three characteristics, specifically.

1, the thermal element should be on and off at any time, digital multimeter gear to the diode file or buzzer file, accurate measurement should be on state, the thermal element accurate measurement is shown below.

2, normally open point NO and normally open and normally closed point NC measurement

Frequently Asked Questions:The digital multimeter is in the same diode or buzzer position, the normally open point NO is usually disconnected, and the normally open point NC is usually closed.

This is also the normal situation of the thermal relay, the following according to the manual simulation simulate the maintenance of the thermal relay, the overvoltage protection power switch to the action state.

3, the thermal relay to carry out over-voltage protection posture, can choose manual calibration and automatic reset, the manual calibration as an example, we should accurately measure the change of the contact point after calibration.

Fu Lian Da Relay

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