Introduction to LS Master-K series PLC programming

The communication control of the inverter is more complicated, so it is listed separately. The communication control of the inverter is a control method for the operation, speed regulation and status indication of the inverter through the communication interface of the inverter. ...

The inverter is usually divided into 4 parts: the rectifier unit, the high-capacity capacitor, the inverter and the controller. Rectifier unit: converts alternating current with a fixed operating frequency into direct current. High Capacitance: Stores converted electrical energy. ...

1. The inverter can adjust the power of the motor and complete the variable speed operation of the motor, so as to achieve the purpose of saving electricity. For example, it is reflected in the centrifugal fan and water pump, when the centrifugal fan and water pump use the frequency converter, the operator can convert the frequency to regulate the speed, and can easily control the flow rate according to the need, so as to save ...

Now enterprises need to use a lot of ventilator inverters, the larger the scale of the enterprise, the more production workshops, the more ventilator inverters will be used. However, no matter how large the enterprise, there is a primary ventilator inverter, the selection of this kind of inverter is very important, because if there is no ...

Most of the inverter manufacturers produce traditional inverters, and their control systems and other power supplies are directly provided by single-phase or three-phase power grids. However, due to the increasing use of VFDs and servo motor amplifiers, a new power supply may emerge: powered by the central DC bus of the VFD. This electric ...

Through the rational planning of the structure of the low-speed centrifuge, the hygienic dead angle can be effectively eliminated. The transition of the structural parts is smooth, and the surface is polished. External structural components, fasteners, and rollers are made of stainless steel. The housing is a clamshell type, which allows for thorough cleaning of the interlayer space of the centrifuge housing without the need for a bowl ...

The basic method of switching the power supply of the device requires us to carry out the corresponding installation and debugging according to the specific model and the device environment. And in the process of installation, we need to pay more attention to safety and stability to ensure the normal operation of the switching power supply. ...

VVVF frequency conversion, vector control frequency conversion, and direct torque control frequency conversion are all one of the AC-DC-AC frequency conversion. Its common disadvantages are low input power factor, large harmonic current, large demand for energy storage capacitors in DC circuits, and renewable energy can not be reflected back to the grid, that is, it cannot carry out four-quadrant operation.

In the control circuit of low-voltage electrical appliances, there are simple low-voltage components such as: buttons, safe, etc.; There are also slightly messy low-voltage electrical control components, such as circuit breakers, touch devices, time relays, thermal relays and other simple components, which makes it necessary to diagnose and analyze the cause of the problem. ...

1. Method 1 Method 1: Fourier transform to obtain the amplitude and phase of each harmonic of voltage and current, calculate the active power of each harmonic according to P=√3UIcosφ, and add the active power of all harmonics to obtain the harmonic power. Method 2: Measure the total active work ...

(1) Excessive voltage error will increase the loss of electrical equipment, shorten the life, and work abnormally, which will damage the stability of the synchronous operation of the power system, the stability of the voltage and the economic operation of the power grid, and will cause the inverter system to report overvoltage fault or undervoltage fault. ...

When the main circuit of the inverter is connected to the power line, in order to control the operation of the motor, it is also necessary to connect the relevant terminals to the peripheral control circuit, and set the parameters of the inverter's starting method to the external operation form. The inverter controls the motor to run, and there are two common methods, which are to turn on the ...

Thermal Overload Relay GTH-22 GTH series: GTH-22, GTH-40, GTH-85, GTH-100, GTH-150, GTH-220, GTH-400、GTH-600、GTH-12M、GTH-12MH、GTH-12M、GTH-MH GTH series: GTH-22, GTH-40, GTH-85 ...

Standardized procedures for safe operation of generator sets 1. Preparation before starting (1) The operators of the computer room should abide by the safety operation procedures, wear work clothes and insulated shoes, and the crew should have a clear division of labor. (2) Check whether the flywheel and part of the generator are not defective. ...

1. Auxiliary contact: the contact mechanically linked with the main circuit of the circuit breaker and the closing mechanism is mainly used for the display of the circuit breaker and the closing status, and is connected to the control circuit of the circuit breaker through the opening and closing of the circuit breaker to control or interlock its related electrical appliances. For example, output to signal lights, relays, etc.

1. The series and parallel connection application of contactors Many electrical equipment are single-phase loads, so several poles of multi-pole contactors can be used in parallel. Such as resistance furnaces, welding transformers, etc. When using several poles in parallel, a smaller capacity contactor can be used. However, it must be noted that after parallel ...

The contactor is an automatic switch for industrial roofs to control its on/off with a button. The contactor consists of an electromagnetic coil, a static armature, a moving armature, a static contact, a moving contact and a fixing bracket. The principle is that when the electromagnetic coil of the contactor is connected to the communication electricity, a strong magnetic field will be generated to make the center of the coil ...

Due to poor contact of network connectors, or due to disturbance and other problems, DP networks that have been used for a long time may show a "transient disconnection" situation, that is, occasionally disconnected instantaneously, and quickly recover to normal. If OB86 is not downloaded, the CPU will stop during a transient outage. Now all over the option to download a ...

1. The operator panel is given The operator panel is a simple frequency setting method of the inverter, and the user can directly change the set rate of the inverter through the potentiometer, digital key or rising and descending keys on the inverter operator panel. The big advantage of the operator panel is that it is simple ...