We want to make sure that the capacity of the inverter is matched. First of all, according to the nature of the load, the correct type of inverter is selected. The general criterion is what is the nature of the load characteristics with what characteristics of the inverter, the following is mainly for pumps and other equipment to clarify. ...

Motor overload: There is no need to set overload maintenance parameters in frequency conversion. The inverter generally acquiesces to the motor overload maintenance based on the motor power. Generally, it is 1.2 times 60 seconds to report the overload problem. The overload factor is not the same for different frequency converters. ...

Although many relays, timers and counters are often used in the ladder diagram programs used by PLCs, PLC does not have these hardware physically, but uses memory and program programming methods to do logic control and editing, and connects external mechanical devices to make physical devices through output components.

1. The switching quantity is also called the logical quantity, which means that there are only two values, 0 or 1, ON or OFF. It is the most commonly used control, and it is the advantage of PLC to control it, and it is also the most basic use of PLC. The intention of switching quantity manipulation is to use the current input combination of the switching quantity with the historical input ...

PLC is the abbreviation of programmable logic manipulator, which is a digital operation manipulator with a microprocessor for automatic control, which can load control instructions into memory at any time for storage and fulfillment. PAC is an abbreviation for Programmable Automation Manipulator. PAC in industrial control ...

Communication: (1) Radiation disturbance; (2) Conduction disturbance Anti-disturbing method: Regarding the disturbance signal transmitted by the radiation method, it is mainly weakened by wiring and shielding the radioactive source and the disturbed line. With regard to the disturbance signal transmitted through the line, ...

The internal disturbances of the PLC system are mainly caused by the mutual electromagnetic radiation between the internal components and circuits of the system, such as the mutual radiation of logic circuits and their influence on the imitation circuit, the interaction between imitation and logic, and the mutual mismatch between components. How to deal with PLC long distances ...

(1) What is the current setting value of the thermal relay? The setting current of the thermal relay refers to its action current, that is to say, it is adjusted between 0.95 - 1.05 times of the rated current of the motor being maintained.

The voltage waveform output by the inverter is similar to a sine wave, but not a real sine wave. Its waveform contains a large number of harmonic components, especially the higher harmonics will increase the output current of the inverter, form the motor winding heating, produce vibration and noise, accelerate the aging of insulation, and even ...

1. For the switching input and output circuits, pay attention to the consistency criterion of maintaining the situation; The positive logic criterion is usually used, that is, when the input and output are live, it is the "ON" state and the data value is "1"; On the other hand, when the input and output are powered off, it is in the "OFF" state and the data value is "0". Such...

(1) Whether there is an abnormal change in the sound during the operation of the motor, including whether there is vibration during the operation of the motor. (2) Whether the installation environment of the inverter has changed. Whether the ambient temperature is normal, the operating temperature of the inverter is generally required to be in the range of -10 °C - +40 °C, and it is better to take about 25 °C.

Assuming that the inverter has a long service life, heat dissipation must be carefully considered. Because the equipment failure rate of the inverter increases exponentially with the increase of temperature, the service life decreases. If the operating temperature rises by 10 degrees, the service life of the inverter will decrease. ...

Input and output loop debugging 1. Analog input (AI) loop debugging. Carefully check the address assignment of the I0 module; Check whether the loop power supply mode (internal power supply or external power supply) is consistent with the field instrument; Use a signal generator to add a signal to each channel at the field end, generally taking 0, 5 ...

1. Select the power supply with excellent performance and press the disturbance introduced by the power grid The power supply of the PLC controller is powered by a non-power line, and is powered by a special line directly led by the main bus of the low-voltage distribution room. Barrier transformer should be selected, the transformer capacity should be 1.2-1.5 times larger than the actual need, and can be used in the barrier...

1. PLC input and output A small PLC controls a complex system with agility, and what can be seen is the upper and lower rows of staggered input and output relay terminals, corresponding lamps and PLC numbers, just like a piece of integrated electricity without dozens of feet. If any ego doesn't look at reason...

In order to prevent the control signal line between the PLC and the inverter from being disturbed by the space electromagnetic field, the outer layer of these control signal lines can be connected with shielded wires to improve the anti-interference ability of the system. This kind of wiring must be noted, and only one point can be selected for the shielded connection address. Whether it's on the PLC side, or ...

There are a variety of harmonic sources in the power system, and the harmonic source is the electrical equipment that injects harmonic current into the shared power grid or generates harmonic voltage in the shared power grid, and the most harmonic source is the converter equipment and other equipment. Harmonic...

The fundamental characteristics of the three major control systems of PLC, DCS and FCS At present, there are three major control systems in the operation of industrial processes in continuous process production, namely PLC, DCS and FCS. The fundamental characteristics of each of them are as follows: 1PLC (1) From the development of switching control to sequential operation...

1. Analog input (AI) loop debugging. Carefully check the address assignment of the I0 module; Check whether the loop power supply method (internal or external) is consistent with the field instrument; Use a signal generator to check the participating signals of each channel at the field end, generally taking three points of 0, 50% or 100%. ...

1. Acknowledging the characteristics of the load such as load type, speed, and nature; 2. Acknowledging whether it is continuous work, long-term work, short-term work and other work characteristics; 3. Acknowledging the maximum consumption output value and the extra output value; 4. Acknowledging ...

(1) There is no need to adjust the parameters, we can maintain the original parameters (default value) when the inverter leaves the factory. (2) It is the parameter that needs to be set and changed before the trial operation. (3) It is a parameter that is adjusted in the operation of the demand. Frequency converters ...