Inverter harmonic suppression method - LS power generation

1. The transformer is grounded twice It refers to the grounding of the S2 terminal of the current transformer or the ground of the n terminal of the voltage transformer. As long as the single point is grounded, because the transformer is blocked between the second and the first, before grounding, the secondary winding has no potential connection with the ground, after grounding, the transformer ...

The Electronic Motor Relay (EMPR) is a digital motor maintenance relay with an MCU that has a compact and compact form factor that can be combined directly with a contactor. Through the implementation of real-time data processing, high reliability and high precision can be completed, and it can pass through phase loss, reverse, unbalance, stalled rotor, connection...

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 ...

The circuit breaker is a fundamental low-voltage electrical appliance, which has the function of overload, short circuit and undervoltage maintenance, and has the ability to maintain the line and power supply. Circuit breaker is an indispensable product in electrical safety. Due to different applications, there are molded case circuit breakers, frame circuit breakers, miniature circuit breakers, etc.

　　The main functions and functions of PLC: 1. For sequential control: sequential control is based on the current and pre-historical situation of the input switch, and produces the required switching output, so that the system can operate in a certain order. ...

1. No-load energizing test of inverter 1. Ground the grounding terminal of the inverter. 2. Connect the power input terminal of the inverter to the power supply through the leakage maintenance switch. 3. Check whether the factory display window of the inverter is normal, if it is incorrect, it should be reset.

1. It is often used in electric motors as control targets. 2. It is used to control power loads such as factory equipment, electric heaters, working machines and various power units. 3. It has the effect of low voltage release protection. 4. It is suitable for frequent operation and long-distance control, and is an automatic operation.

After we have selected a suitable Variable-frequency Drive (VFD), we also need to consider whether we need to equip other peripheral equipment according to the actual situation of the site. The peripheral equipment selected by VFD mainly includes circuit breakers, reactors, contactors, braking resistors, etc. ...

In fact, the fault of the motor is not the cause of the motor itself, most of them are caused by the non-standard debugging of the inverter or the wrong inverter motor when the inverter motor is used, etc., mainly in the following situations: 1. Treat the general motor as a ...

A frequency converter is actually an inverter. It starts by turning alternating current into direct current. Then the direct current is switched on and off with electronic components. Becomes alternating current. Thyristors for general inverters with larger power. And set up a device with adjustable frequency. Make the frequency adjustable within a certain range. Used to control ...

1. The working temperature of the inverter is high 1. Check whether the ambient temperature of the inverter is too high; 2. Check whether the cooling fan inside the device is working properly; 3. Check whether the ventilation pores and mask grilles are blocked; 4. Check if the load is too heavy. ...

1. The inverter should not be installed on the equipment with a sensation, because the main circuit connection screw in the inverter is easy to loosen, and many inverters are damaged due to this reason. 2. Wiring problem: the input terminal of the inverter should be connected to a ...

The PLC should be kept away from strong disturbance sources such as electric welding machines, high-power silicon rectifiers and large-scale power equipment, and should not be installed in the same switch cabinet as high-voltage electrical appliances. Power line, control line and PLC power line and I/O line should be separated from the wiring, barrier transformer and PLC and I/O should be selected ...

(1) The core noise is large: it is normal for the electromagnetic system to produce a slight humming sound during operation, if the sound is too loud or abnormal, it can be judged that the electromagnetic system has a problem, and there are three reasons: (1) Poor contact between the armature and the core or tilting of the armature. After repeated collisions between the touch of the armature and the core, ...

With the deepening of factory automation, the high efficiency and low cost of active warehouses, elevators, transfer systems, etc., as well as the high speed, high efficiency and high precision of small CNC machine tools, kneading and forming machines, textile and film machinery, etc.

1. Speak before you start When it comes to faulty electrical equipment, you should not rush into action, but ask about the passage and phenomenon of the fault. For unfamiliar equipment, you should also understand the circuit principle and structural characteristics, and follow the corresponding rules. Before dismantling, it is necessary to fully understand each ...

The first generation of LS inverter selects the voltage frequency ratio scalar control method, which carries out frequency conversion speed regulation according to the linear ratio determined by the equivalent circuit of the asynchronous motor. Voltage refers to the effective value of the fundamental wave, and changing U/f can only regulate the steady-state magnetic flux and torque of the motor, not to mention dynamic control. In order to improve the low ...

1. Vibration circuit: the drainage-source and R4 of the main winding N1 and Q1 of the switching transformer are the channels for the working current of the power supply; R1 provides the starting current; The self-powered windings N2, D1, and C1 constitute the power supply voltage of the vibrating chip. The normal operation of these three links is the prerequisite for the power supply to vibrate.

1. Improper device: The motor is not concentrious with the equipment being dragged, resulting in excessive radial load on the motor, which eventually leads to metal exhaustion. When the radial load on the extension end of the motor shaft is too large, it will cause the motor shaft to have zigzag deformation in the radial direction. When the motor rotates, the shaft's ...

Features of SUSOL series circuit breakers: It can be used as the main switch of electrical equipment, and the limit breaking ability is high, Icu=Ics Modular construction of circuit breakers: Tripper replacement (TS series) can be combined in a variety of combinations, such as ...