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Push button switch, also known as control button (referred to as button), is a low-voltage electrical appliance that can be manually reset and generally automatically reset. Buttons are usually used in circuits to issue start or stop commands to control the on and off of electric coil currents such as electromagnetic starters, contactors, and relays.
The push button switch is an electrical appliance that is used to turn on and off small current circuits, which is pressed to act and released to reset. It is generally used in control circuits with AC and DC voltages below 440V and currents less than 5A. Generally, it does not directly control the main circuit, but can also be used in interconnected circuits.
In actual use, in order to prevent misoperation, the buttons are usually marked with different marks or painted with different colors to distinguish them. The colors are red, yellow, blue, white, black, green, etc. Generally, red indicates operation in a "stop" or "dangerous" situation; green indicates "start" or "connect". The emergency stop button must use a red mushroom head button. The button must have a metal protective retaining ring, and the retaining ring should be higher than the button cap to prevent accidental touch of the button and cause malfunction. The material of the button plate and button box where the button is installed must be metal and connected to the general ground bus bar of the machine.
Use Maintenance Edit
(1) The button should be checked frequently to remove the dirt on it. Due to the small distance between the contacts of the button, after many years of use or when the seal is not good, dust or various stages of oil emulsion will flow in, which will cause insulation reduction or even a short circuit accident. In this case, insulation and cleaning must be carried out, and corresponding sealing measures must be taken.
(2) When the button is used in a high-temperature place, it is easy to deform and age the plastic, causing the button to loosen and causing a short circuit between the wiring screws. According to the situation, a fastening ring can be added to tighten it during installation, and an insulating plastic tube can also be added to the wiring screw to prevent loosening.
(3) The button with the indicator light is easy to deform the plastic lampshade due to the heat of the bulb for a long time, which makes it difficult to replace the bulb. Therefore, it is not suitable to be used in places where the power-on time is long; if you want to use it, you can properly reduce the voltage of the bulb to prolong its service life.
If poor contact is found, the cause should be found out: if the contact surface is damaged, it can be repaired with a fine file; if there is dirt or soot on the contact surface, it should be wiped clean with a clean cotton cloth dipped in solvent; if the contact spring If it fails, it should be replaced; if the contact is severely burned, the product should be replaced.
Signal indicator light, a device that uses light to monitor the working or position status of circuits and electrical equipment. It is also the most intuitive and unique monitoring component in automation equipment. The main function is usually used to reflect the working state of the circuit (with or without electricity), the working state of electrical equipment (running, outage or test) and position state (closed or disconnected), etc. To remind the operator to deal with the fault in time, or operate a certain function to complete the relevant action.
Push button switch, also known as control button (referred to as button), is a low-voltage electrical appliance that can be manually reset and generally automatically reset. Buttons are usually used in circuits to issue start or stop commands to control the on and off of electric coil currents such as electromagnetic starters, contactors, and relays.
Main functions: generally used in control circuits with AC and DC voltages below 440V and currents less than 5A, generally do not directly manipulate the main circuit, but can also be used in interconnected circuits. In order to control the operation of the equipment, stop, pause or reset and other functions.
Circuit breakers, contactors, intermediate relays, thermal relays, buttons, indicator lights, universal transfer switches and travel switches are the eight most common components in electrical control circuits. The editor introduces the principles and applications of common electrical components with pictures and texts. Get a handle on how these components work in normal times by understanding their role in the electrical circuit.
1. Circuit breaker
Low-voltage circuit breakers are also called automatic air switches, which can be switched manually, and can be used to distribute electric energy, start asynchronous motors infrequently, and protect power lines and motors. Automatically cut off the circuit.
◆Outline drawing of commonly used circuit breakers
2. Contactor
The contactor is composed of two parts, the electromagnetic mechanism and the contact system. The common coil voltages of the contactor are AC220V, AC380V and DC220V. The electromagnetic mechanism of the contactor is composed of a coil, a moving iron core (armature) and a static iron core; the contactor contact system is composed of two parts, the main contact and the auxiliary contact, the main contact is used to switch the main circuit, and the auxiliary contact is used to control in the circuit.
◆Outline pictures of commonly used contactors
