The relay is made up of a combination of high-quality sealed small relays with low coil voltage. It is moisture-proof, dust-proof, continuous, highly reliable, and overcomes electricity.
Intermediate relay sample map
Intermediate relay sample map
The shortcomings of the magnetic intermediate relay wire are too thin and easy to break; the power consumption is small, the temperature rise is low, no external power resistor is needed, and the installation and wiring are convenient; the relay contact has large capacity and long working life; The tube indication is convenient for on-site observation; the delay is only set by the dial switch on the panel, the delay precision is high, and the delay range can be arbitrarily set at 0.02-5.00S.
The purpose of the intermediate relay:
Intermediate relays are used in various protection and automatic control lines to increase the number of contacts and contact capacity in the protection and control loops.
Classification of intermediate relays:
Low current start intermediate relay
Static intermediate relay
Delay intermediate relay
Electromagnetic intermediate relay
Intermediate relay for elevator
Rail type intermediate relay
Intermediate relay principle
When the coil is energized, the moving iron core moves under the action of electromagnetic force, and the moving contact is actuated to make the normally closed contact separate, and the normally open contact is closed; when the coil is powered off, the moving iron core drives the moving contact under the action of the spring. Reset, the working principle of the relay is to make a certain input quantity (such as voltage, current, temperature, speed, pressure, etc.) to move to change the working state of the control circuit to achieve the established control or protection. purpose. In this process, the relay mainly plays the role of transmitting signals.
The role of the intermediate relay
The general circuit is often divided into two parts: the main circuit and the control circuit. The relay is mainly used for the control circuit. The contactor is mainly used for the main circuit. The relay can realize the function of controlling one or several signals with one control signal to complete the start and stop. Control, linkage and other control, the main control object is the contactor; the contacts of the contactor are relatively large, bearing capacity is strong, through it to achieve the control of weak electricity to strong electricity, the control object is electrical appliances.
1. Replace small contactors
The contacts of the intermediate relay have a certain load capacity. When the load capacity is small, it can be used to replace the use of small contactors, such as electric shutters and some small appliances. This has the advantage that it can not only serve the purpose of control, but also save space and make the control part of the appliance more delicate.
2. Increase the number of contacts
This is the most common use of intermediate relays. For example, in a circuit control system, when a contactor of a contactor needs to control multiple contactors or other components, an intermediate relay is added to the line.
3. Increase contact capacity
We know that the intermediate relay's contact capacity is not very large, but it also has a certain load capacity, and the current required for its driving is very small, so the intermediate relay can be used to expand the contact capacity. For example, it is generally not possible to directly use the output of the inductive switch or the triode to control the electrical components with relatively large loads. Instead, an intermediate relay is used in the control line, and other loads are controlled by the intermediate relay to achieve the purpose of expanding the control capacity.
4. Conversion contact type
In industrial control lines, it is often the case that the control requires the use of a normally closed contact of the contactor for control purposes, but the normally closed contact of the contactor itself has been used up and the control task cannot be completed. At this time, an intermediate relay can be connected in parallel with the original contactor coil, and the normally closed contact of the intermediate relay can be used to control the corresponding components, and the type of the contact is switched to achieve the required control purpose.
5. Used as a switch
In some control lines, the switching of some electrical components often uses an intermediate relay, which is controlled by the opening and closing of its contacts. For example, the automatic degaussing circuit commonly used in color TVs or displays, the triode controls the on and off of the intermediate relays, thereby achieving control degaussing. The function of the coil on and off.
6. Conversion voltage
7. Eliminate interference in the circuit
Power direction relay
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Contact person: Elva Zhuang&Sunny Ni
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