The relay used in automation equipment will have the phenomenon of iron tie up from time to time, ho

Tie Failure: Tie Tie fault is a term used in circuit maintenance, which is more common in the automotive repair industry. Tie fault refers to the phenomenon that the non-tie wire (or tie post) directly touches the frame in the automotive electrical equipment circuit, resulting in a short circuit between the positive and negative electrodes of the power supply.

A slight tie-up fault will cause the car to leak electricity, so that the battery loses power, and a serious hit-iron fault will damage the power supply (including the battery and generator), burn out the line or even catch fire. Here are some ways to detect failures in automation equipment:

Check all power and air sources of automation equipment. Problems with power supply and air supply often lead to the failure of automation equipment. For example, there is a problem with the power supply, including the failure of the power supply of the whole workshop, such as low power supply, fuse burning, poor contact of the power plug, etc.; The air compressor is not opened, the pneumatic triple or double is not opened, the flow restrictor is turned off, etc.

The following aspects should be included when testing automation equipment: power supply, including the power supply of each equipment and the power supply of the workshop and the air pressure source required by the pneumatic device.

Check for sensor positions in automation equipment. Due to the negligence of equipment maintenance personnel, there may be errors in the position of some sensors, such as not in place, sensor failure, sensitivity failure, etc. Always check the sensing position and sensitivity of the sensor, adjust the deviation in time, and replace the sensor immediately if it is broken.

In many cases, in addition, due to the vibration of automatic equipment, most of the sensors will be loose after long-term use, so it is necessary to check whether the sensor position is correct and whether it is firmly fixed during daily maintenance.

Inspect relays, flow limiters, and pressure reducing valves for automation equipment. Relays, like magnetic inductive sensors, will also have iron sticking after long-term use, so that the normal operation of the electrical circuit cannot be guaranteed, and it needs to be replaced. In the air circuit system, the pressure regulating springs of the flow restrictor and pressure reducing valve can also loosen or slide as the equipment vibrates.

These devices, like sensors, are components in automation equipment that require routine maintenance.

Check the components in the electrical, solenoid valve, and air circuit connections. If you don't find any problems in the above three steps, then check all the circuits. Check whether the wires in the circuit are broken, especially if the wires in the trunking are cut by the trunking due to pulling.

Inspect the trachea for damaging creases or cracks. If the trachea has severe creases or cracks, replace them immediately.

Check whether the solenoid valve has reversing action, the solenoid valve is reversing the cylinder by the solenoid spool, when the solenoid fails, the valve core does not move, resulting in the cylinder can not act. If there is a lot of water and dust in the air circuit, it will also cause the valve core to jam and block, resulting in the cylinder being unable to operate.

After the above steps are guaranteed to be correct, it is possible that the fault may occur in the controller of the automation equipment, but it can never be a procedural problem. First of all, don't be sure that the controller is destroyed, as long as there is no serious short circuit, the controller has short circuit protection inside, and the general short circuit will not burn the controller.

Automation equipment mainly uses power components, control components, actuator components, transmission components, IO components and other components. The smallest unit that accomplishes a certain function in an automated system. It is the most basic part of the automation technology tool.

Automation instruments and automation equipment are made up of elements with various functions.

There is no strict boundary between the component and the instrument, and it is customary to refer to the compact and single-function automation technology tool as the automation element. Automation components can be broadly divided into those that acquire information (see Sensors); Components that convert information (see Converters.)

elements that process information (see controller); Elements that execute information (see Actuators), etc.

The equipment includes: power components, control components, actuator components, transmission components, and IO components. There are two categories of power components: motor and cylinder, and control components include PLC, single-chip microcomputer, relay, industrial computer, etc.; Actuators are similar to power components, and the transmission is some lead screws, belts, gears, chains, etc., and IO includes various sensors and displays (HMI, displays, etc.).

Automation equipment factories generally procure, inverter (AC and DC) contactors, circuit breakers, thermal relays, signal transmitters, PLC and related IO modules, touch screens (industrial computers), etc., commonly used cables, terminals, trunking, line rails, etc.

The mechanical part, lead screws, belts, gears, chains, motors, oil cylinders, cylinders, bearings, screws (sets).

The mechanical part includes, profiles, and square angle iron, format aluminum profiles, stainless steel materials, etc., bearings, screws, screws, guide rails, casters, and other assembly materials.

The electrical part includes: motor, servo, stepper, travel switch, photoelectric switch, PLC, touch screen, relay, relay and include, solid state relay, intermediate relay, time relay, etc., contactor, inverter, thermocouple, heating wire, pressure gauge, solenoid valve, cylinder, hydraulic system, cylinder and other sensors and transmitters.

White Camel, as a professional portal for automation equipment, has a comprehensive range of automation-related information and automation equipment manufacturers.

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How many times per minute does each relay of your system act?

How many days can you last when your life is short?

Air switches, contactors, thermal relays, electromagnetic relays, etc. are all selected according to the current, and the current is calculated according to the load under it. The same goes for cables, and the wire diameter is selected according to the current.

First determine the power, current, and voltage of the motor load class and then select according to these parameters, the air opening is one level larger, the corner connector thermal relay is larger, and the electromagnetic relay should consider the voltage level and the number of contacts and the type of contact

Select a slightly larger device according to the load current, and each device has a rated current carrying capacity description.

The capacity is calculated in kva, which is the apparent power. It is the square of the active power + the square of the reactive power. The power is measured in kwThe total power of the device divided by basically the capacity.

The capacity of the capacitor mainly depends on the power of the device, which is larger than the actual power of the device and has a certain margin.

1. PLC

1. Advantages: 1) High reliability. Because most of the PLCs use monolithic microcomputers, they have a high degree of integration, coupled with the corresponding protection circuits and self-diagnosis functions, which improve the reliability of the system.

2) Easy to program. The programming of PLC mostly uses relay control ladder diagram and command statement, and its number is much less than that of microcomputer instructions, except for medium and high-end PLC, there are only about 16 small PLCs in general.

3) Flexible configuration. Due to the building block structure of the PLC, the user can flexibly change the function and scale of the control system by simply combining them, so it can be applied to any control system.

4) The input and output function modules are complete. One of the biggest advantages of PLC is that there are corresponding templates for different field signals that can be directly connected to devices in the industrial field and connected to the CPU motherboard through the bus.

5) Easy to install. In contrast to computer systems, the installation of PLCs requires neither a dedicated computer room nor strict shielding measures.

6) Fast running speed. Since the control of the PLC is carried out by program control, both its reliability and operating speed cannot be compared with the logic control of the relay.

2. Disadvantages: high cost, the user needs PLC professional knowledge.

2. Relay control system.

1. Advantages: The relay control system is composed of devices and wires, which has the advantages of simple structure and low cost, and is easy to grasp for engineers and technicians due to its simple principle.

2. Disadvantages: For complex systems, the design and installation of the whole system is particularly large, and sometimes it becomes impossible to complete. Physical contact with mechanical contacts is prone to damage; Wiring is also susceptible to vibrations, etc., and reliability deteriorates.

1 Control mode: relay.

The control of the device is realized by using hardware wiring, which is the use of the relay mechanical contacts in series or parallel pole delay.

The combination of hysteresis action of capacitive relay forms control logic, which can only complete the established logic control. PLC adopts storage logic, and its control logic is stored in memory in the form of a program, and to change the control logic, you only need to change the program, which is called soft wiring.

2 Control speed The relay control logic relies on the mechanical action of the contact to achieve control, the working frequency is low, millisecond, and the mechanical contact has jitter. PLC is controlled by program instructions to control semiconductor circuits, with fast speed, microsecond level, strict synchronization, and no jitter.

3 Delay control The relay control system relies on the lag action of the time relay to achieve delay control, and the timing accuracy of the time relay is not high, and it is difficult to adjust the time due to the environmental influence. PLC uses semiconductor integrated circuit as timer, and the clock pulse is generated by the crystal oscillator, which has high precision, convenient time adjustment, and is not affected by the environment.

PLC, the brain of modern mechanical equipment! 62616964757a686964616fe4b893e5b19e31333264636232

The biggest advantage of PLC is high flexibility, low failure rate, and convenient troubleshooting. If it is a medium-sized and large-scale system, the cost of PLC is relatively lower than that of the relay system, and the scalability and maintainability are high, and the control group can be easily formed.

PLC Advantages Functions can be implemented with programs, so the flexibility is relatively large Disadvantages: High cost Requires PLC expertise.

Relay control Advantages Low cost As long as you understand the basics of electricians Disadvantages: The wiring is more complex and the function is single.

Sure PLC is good, that is, it must be able to use.

Relay is an electronic control device, it has a control system (also known as an input loop) and a controlled system (also known as an output loop), usually used in automatic control circuits, it is actually a kind of "automatic switch" to control a larger current with a smaller current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.

There are many types, the most common is a small current control electromagnet, the small current current or power off makes the magnet move, and the magnet has a large current contact on it, so as to achieve on/off.