Relay may be more unfamiliar to some friends. It is an electric equipment and is mainly used in automated power systems.Relay is an electronic control device. It has a control system (also known as input circuit) and the control system (also known as output circuit). It is usually used in automatic control circuits. It actually uses smaller current to control larger than large current controlA "automatic switch" of current.Therefore, automatic adjustment, security protection, and conversion circuits are played in the circuit.
The role of relay
The role of a relay is used as a control component. In summary, relay has the following functions: 1. Expand the control range: For example, when the multi -contact relay control signal reaches a certain value, you can press different forms of the contact group and change the connection at the same time at the same time., Open and connect multiple circuits.2. Elimination: For example, sensitive relay, intermediate relay, etc., with a very small amount of control, can control a high -power circuit.3. Comprehensive signal: For example, when multiple control signals enter multi -winding relay in the prescribed form, after a comprehensive synthesis, the predetermined control effect is achieved.
Intermediate relay
I. Classification of relays 1. According to the role of relays in the protective circuit, relay can be divided into startups, quantified relays, time relay, signal relay, export relay and intermediate relay.Because of their different effects, the working principles are also different.The commonly used intermediate relay mainly includes two types of JZ7 series and JZ8 series, the latter is dual -use.2. The main difference between the intermediate relay and the contactor: The main contact of the contactor can pass through large current, while the intermediate relay can only pass through the small current.Therefore, it can only be used to control the circuit.It generally does not have the main contact, because the overload capacity is relatively small.Therefore, all it uses is auxiliary contacts, with a large number.
Time Relay
I. Time relay wiring method: 1. Control wiring: You think of it as DC relay to consider.3, 7 to connect 12V control voltage; 2 and 7 to connect 24V control voltage.7 of them are the negative electrodes of DC, receiving the zero line when used.2 Link the cable of 220V.2. Work control: Although the control voltage is connected, it is determined by the timer on the panel.3. Functional understanding: It is a switch, a single knife and double throw, and there is a activity of the activity arm, just like the common sword switch activity knife arm.8 is the activity point, 5 is the normally closed point. When the relay is not moved, the two of them are connected.During action, 8 and 6 are connected.
Relay symbol
Contactor KM, polarized relay KP, countercurrent relay KRR, intermediate relay KA.Current relay KC, voltage relay KV, signal relay KS, gas relay KB.Ground relay KE, differential relay KD, re -closing closing relay KRR, pressure relay KPR.Light flow relay KF, thermal relay KH, time relay KT, temperature relay KTE, zero -order relay KCI.Flash relay KFR, video surveillance relay KSP, power direction relay KPD, strolling relay KOS.
Relay wiring diagram
The role of relays: 1. Expand the scope of control.For example, when the multi -contact relay control signal reaches a certain value, it can be replaced, cut off, and connects multi -road circuits according to the different forms of the contact group.2. Zooming.For example, sensitive relay, intermediate relay, etc., with a small amount of control, can control a high -power circuit.
Relay working principle
1. Relay is an electronic control device, which has a control system (also known as input circuit) and the control system (also known as output circuit). It is usually used in automatic control circuits.A "automatic switch" with a larger current.Therefore, automatic adjustment, security protection, and conversion circuits are played in the circuit.

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