How does the Frequency Converter Soft Start Cabinet achieve smooth motor starting and avoid current shock?
Publish Time: 2024-08-07
The way the Frequency Converter Soft Start Cabinet achieves smooth motor starting and avoids current shock mainly depends on its internal inverter control technology and corresponding parameter settings. The following is the specific implementation method:1. Technical principleInverter control:The Frequency Converter Soft Start Cabinet controls the motor starting process through the inverter. The inverter can adjust the frequency and voltage of the power supply to control the speed and torque of the motor.During the startup phase, the inverter gradually increases the output voltage and frequency so that the motor can accelerate smoothly and avoid the large current shock during direct startup.Stepless voltage regulation:The inverter soft starter uses a three-phase anti-parallel thyristor as a voltage regulator, which is connected in series between the power supply and the stator winding of the motor. Through the contactless on-off circuit of the thyristor, stepless voltage regulation, that is, smooth regulation of voltage and frequency, can be achieved.This stepless voltage regulation method enables the motor to gradually accelerate during the startup process until it reaches the rated speed, thus achieving a smooth start.2. Parameter settingAcceleration and deceleration time:In the Frequency Converter Soft Start Cabinet, you can set the acceleration and deceleration time of the motor. These time parameters determine the time required for the motor to go from rest to rated speed or from rated speed to rest.By setting the acceleration and deceleration time reasonably, you can ensure that the motor has sufficient time to accelerate and decelerate during the start and stop process, thereby avoiding the current shock caused by excessive acceleration.Current limiting multiple/constant current value:The inverter soft starter also has a current limiting function, which can set the maximum starting current at startup to a multiple of the rated current or the maximum current value (current limiting multiple/constant current value).By setting this parameter, the current size of the motor during the startup process can be limited, thereby avoiding the impact of excessive current on the motor and the power grid.3. Protection functionOvercurrent protection:Frequency Converter Soft Start Cabinet has an overcurrent protection function. When the motor has excessive current during startup or operation, the inverter will automatically cut off the power supply or reduce the output voltage and frequency to protect the motor and the power grid from damage.Other protection functions:In addition to overcurrent protection, the Frequency Converter Soft Start Cabinet also has multiple protection functions such as phase loss protection, thyristor short circuit protection, and thyristor overheat protection. These functions can ensure that the motor can operate safely under various working conditions.In summary, the Frequency Converter Soft Start Cabinet uses inverter control technology, reasonable parameter settings, and multiple protection functions to achieve smooth motor startup and avoid current shock. These measures not only protect the safe operation of the motor and the power grid, but also improve the working efficiency and production efficiency of the motor.
