The basic problem of LS electric molded case circuit breaker

Although many names such as relays, timers and counters are often used in the ladder diagram programs used by LS PLC, LS PLC does not have these hardware physically, but uses memory and program programming to do logic control and editing, and connects to external machines through output components.

LS inverter, the full name of LS communication frequency conversion governor, after supplying a variety of equipment, converts direct current into communication electricity, and changes the voltage and frequency of ordinary power supply input to control the speed of the motor, to meet different industrial needs, and then complete the energy saving and environmental protection of the automation system. ...

The inverter is composed of many electronic parts, such as semiconductor components, etc., in the operation and maintenance involves the replacement of a related component, because of the composition or physical characteristics of the inverter, it will deteriorate in a certain period of time, so it will reduce the characteristics of the inverter, and even ...

In order to use the inverter correctly, it is necessary to consider that the service life of the VFD decreases exponentially with the increase in temperature. This is due to: When the ambient temperature rises by 10 degrees, the service life of the VFD is halved. So pay attention to heat dissipation! When the VFD is working, the current flowing through the VFD is very large, and the VFD emits ...

Brake unit: The function of the braking unit is to turn on the energy-dissipating circuit when the voltage Ud of the DC circuit exceeds the specified limit (such as 660V or 710V), so that the DC circuit can release energy by thermal energy after passing through the braking resistor. The braking unit can be divided into built-in and external, the former is ...

1. Outstanding frequency conversion speed regulation characteristics Completing the frequency conversion speed regulation of asynchronous motor is the "century wish" that people have been waiting for since the creation of asynchronous motor for 100 years. Through unremitting improvement, enhancement and perfection, the speed regulation function of VFD is not bad, that is, compared with the DC speed regulation system, the part ...

To discuss the disturbance problem of LS inverter, we must first understand the operating principle of inverter, from the structural point of view, inverter is divided into direct inverter and direct inverter. The direct inverter is a communication that directly converts the I frequency current into a controllable frequency, and there is no intermediate DC link. Each phase of it ...

K120S series PLC product is a unit PLC product introduced to the market by LS in 2004, which has laid a solid foundation in the low-end small machinery supporting industry with its high-performance price ratio. Relying on some special functions of the product, it has also won some industry praise. ...

LS inverter and LG inverter are the same, there is no difference between the two. LS inverter, the full name of LS AC inverter governor, after supplying a variety of configurations, converts direct current into communication power, and changes the general power supply ...

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. ...

Solid state relays consist of three parts: the input circuit, the barrier (coupling), and the output circuit. Input Circuit: According to the different categories of input voltage, the input circuit can be divided into DC input circuit, communication input circuit and AC-DC ...

The technical parameters of the inverter (Variable-frequency Drive, VFD) are divided into the input side and the output side. The technical parameters of the input side of the VFD include input voltage, number of phases and frequency; Output-side technical parameters include additional output voltage, additional current, additional capacity, capacity, frequency accuracy, etc.

1. Soft start function The soft start function of the inverter is no longer necessary to talk about today, and twenty years ago, it was still a very exciting operation, which is also one of the auxiliary basic functions of the inverter. At the beginning of the birth of the inverter, it was aimed at the most widely used three-phase asynchronous squirrel cage ...

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. ...

Principle analysis is the most fundamental way to eliminate the problem, when other methods are difficult to see the effect, you can start from the basic principle of the circuit, step by step to view, and finally find out the cause of the problem. To use this method, it is necessary to have a clear understanding of the principle of the circuit, and to grasp the various ...

As for the use of vector-operated motors, it can be divided into two categories, namely non-reactive vector control (SVC) and reactive vector control (FVC). Vectorless Handling (SVC): Due to the speed response, additional equipment for the encoder is installed in the motor dragged by the inverter, which is cumbersome. Here...

Inverter device environmental requirements 1: operating temperature; The inverter is a high-power electronic component, which is easily affected by the working temperature, and the product is generally required to be 0-55 °C, but in order to ensure that the work is [safe] [complete] [can be] [reliable], the use should be considered to leave room for control, and the control is at 40 ...

Burn two new motors in a row! The output current and voltage of the inverter are balanced, the input voltage is balanced, the current is unstable, and the fluctuation is 20%-50%, the inverter is burned off by a short circuit between 35Hz turns, the grid voltage is very stable, 720V, the interval between the motor and the inverter is 120m, and the input and output terminals of the inverter are powered ...

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.

1 AC three-phase circuit a) Yellow for phase A, green for phase B, and red for phase C; b) Light and blue colors for the neutral line or neutral line; C) Yellow and green two-color wires are used for safety grounding wires. 2 AC circuits connected by twinax wires or stranded wires: red, black ...