Function of water resistance cabinet of high voltage cage motor with PLC

  Operation place of PLC control of cage type water resistance cabinet:
1
The transformer capacity of the factory is limited, and the starting current of the motor is large, which affects the normal operation of other electrical equipment, and even endangers the safety of the transformer

2
Start with a frequency sensitive rheostat and often burn the frequency sensitive package; It is necessary to start and adjust the position of the equipment continuously for many times;
3
The load is heavy, and the motor is often difficult to start; The power grid is unstable or the voltage drop of the power grid is large, and the motor is difficult to start;
The flexible configuration of Xiangyang Yuanchuang Electric is designed to meet the requirements of new applications (renovations) except OEM customization
It is an innovative and economical device that combines advanced functions, unparalleled configuration flexibility and an extremely comprehensive user interface
It has open and closed control configurations, which can meet the needs of commercial buildings and OEM departments

In the process of starting, the liquid resistance with variable resistance is connected in series to the stator circuit or rotor circuit to realize current limiting, and it is shorted after starting
The variability of the resistance value is achieved by changing the distance between the two electrode plates
The motor speed increases smoothly with the reduction of the resistance value, so as to maintain or increase the starting torque, and prepare for no current shock during short circuit

The method of cascading the liquid resistance into the stator side essentially belongs to step-down starting, which is at the cost of losing part of the starting torque; However, for high-power high-voltage AC motors starting with non constant torque loads (such as fans) or light loads, when the power grid capacity is not large enough or the instantaneous impact on the driving equipment is large, it is one of the better ways to take

The method of inserting liquid variable resistance in series at the rotor side can always maintain a large starting torque while limiting the starting current
In addition, it can also adjust the speed smoothly according to the needs of working conditions
Because it can be connected to the stator side or the rotor side, the liquid soft starting equipment has the characteristics of wide adaptability; At the same time, liquid soft starting equipment can integrate many advanced control technology means (such as computer simulation design, programmable control, remote communication, etc
), so it is a starting family product with broader connotation and stronger high-tech concept, especially suitable for high-power motors, compared with traditional metal resistors, frequency sensitive varistors, reactors and other products