Megmeet PLC - the characteristics of the working process of PLC

(1) The PLC adopts the working mode of centralized sampling and centralized output, which reduces the influence of external interference. (2) The working process of PLC is the process of cyclic scanning, and the length of cyclic scanning time depends on the speed of instruction execution, the length of the user program and other factors. (3) Output ...

Peripheral circuit component failure This type of failure often occurs in the failure of the PLC after a certain period of work. In the PLC control loop, if there is a component damage fault, the PLC control system will immediately and automatically stop working. The input circuit is PLC to accept switching quantities, analog quantities, etc.

1. Power supply The power supply of the PLC plays a very important role in the whole system. It can't work properly without a good and reliable power supply system, so PLC manufacturers also attach great importance to the design and manufacture of power supplies. General AC voltage fluctuations are +10% (+15%) ...

Before using the inverter, the inverter parameters should be carried out from the following aspects: First, confirm the motor parameters, the inverter sets the power, current, voltage, speed, and maximum frequency of the motor in the parameters, and these parameters can be directly obtained from the motor nameplate. Clause...

1. The meaning of the representation is different: PLC is the abbreviation of planar optical waveguide (technology), the so-called planar optical waveguide, means that the optical waveguide is located in a plane. A servo control system is a feedback control system used to accurately follow or reproduce a certain process.

1. Metallurgical industry - the application of high-voltage inverter in the metallurgical profession mainly includes plate and wire rod rolling mills, coilers, fans, slurry pumps, etc., with the primary intention of motor energy saving. 2. Electric power industry - China's power generation capacity ranks second in the world, second only to United States. The power profession is also changing.

1) Hand arc welding (STICK) Shielded Arc Welding (abbreviated SMAW) in English, The principle is: the arc occurs between the coating electrode and the base metal, and the welding method of arc thermal ablation electrode and base metal is used. The outer layer of the electrode is covered with solder, which is dissipated in case of heat.

When the inverter is installed and wired; Note: When more than two inverters are installed in the same cabinet, please pay attention to the installation position and spacing to ensure the heat dissipation effect. Dangerous: 1. It should be operated by professional electrical engineering personnel, otherwise there is a risk of electric shock. 2. Please make sure before wiring...

One. It is difficult to start the arc and easy to break the arc 1. Confirm that the quality of the electrode you use is good, and the poor quality electrode may not meet the requirements of high-quality welding: 2. The welding rod that has not undergone drying treatment is also not easy to arc, and causes the arc to be unstable, so that the welding defects increase, and the welding ...

1. The arc is stable in the field of full current, the spatter is small, and the same welding machine is not only suitable for small current base welding, but also suitable for high current and high deposition rate work 2. Arc concentration and strong penetration. With the same penetration depth, the heat input is reduced by more than 20% compared with other gas shielded welding machines, and the thermal deformation ...

1。 How do you distinguish between heavy and light failures? When the fault is light, the system sends out an alarm signal, and the fault indicator flashes. When a major fault occurs, the system issues a fault indication, and the fault indicator is always on. At the same time, a command is issued to break the high voltage and close the prohibition, and the fault information and high voltage are instructed.

1. The Megmeet rectifier module is damaged It is usually caused by grid voltage or internal short circuit. In the case of sweeping the internal short circuit, the rectifier bridge is replaced. When dealing with faults on site, we should focus on checking the status of the user's power grid. Such as the power grid voltage, whether there is an electric welding machine, etc.

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1. Understand the type of variable frequency load The correct selection of the frequency converter is very critical for the proper operation of the control system. When selecting a frequency converter, it is important to fully understand the load characteristics driven by the frequency converter. In practice, production machinery is often divided into three types: constant torque load, constant ...

1. Check the surrounding situation - carefully check the ventilation and lighting of the inverter and the surrounding environment. It is necessary to ensure that the ventilation equipment is functioning properly and that the lighting equipment is in working order. 2. Check the internal cable - open the inverter cabinet door and check whether the internal cable is damaged, the cable ...

1. The operating ambient temperature of the inverter (mainly refers to the air temperature of the air inlet of the power unit cabinet) requires a minimum ambient temperature of -5 °C and a maximum ambient temperature of 40 °C. In order to improve the reliability and extend the service life of the drive, check the following items: Air conditioning and refrigeration ...

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PLC maintenance and inspection steps: 1. Check and make sure the mains power is on (120 VAC) 2. Check the available 24V power supply 3. Identify problem areas. It is recommended that peak currents cover this error code, a control method consisting of multiple components distributed over an area or process.

(1) Spot welding: The weldment is pressed between the two cylindrical electrodes, heated by electricity, so that the weldment melts at the contact to form a nugget, and then the power is cut off, and it solidifies and crystallizes under pressure to form a dense solder joint. Spot welding is suitable for welding thin plates (laps) and steel bars below 4 mm.

Installation: The installation mode of PLC system is divided into centralized, remote I/O and distributed with multiple PLC networking. Centralized does not need to set up the drive remote I/O hardware, the system response is fast, and the cost is low; Remote I/O is suitable for large systems with a range of ...