ACslo is a high-voltage inverter without fuse protection. The IGCT placed between the DC link and the rectifier bridge protects the IGCT. The IGCT can directly separate the inverter and the rectification section from 25xlo to 65. The rapidity is 100 times that of the fuse; the mature microprocessor control technology is used to monitor the electromagnetic state of the motor. These data are combined with the direct torque control technology (DTC). Effect, light control, coated glass for heat adjustment, tempered coated glass, hollow coated glass and laminated coated glass for safety and shading. The coated glass adopts off-line vacuum magnetron cathode sputtering method to complete a multi-layer uniform and firm coating layer on the flat glass to achieve the spectral reflection effect. By adjusting the thickness of the film layer, a good heat reflection function and metallic luster can be formed.
Fujian Building Materials achieves near-perfect sensorless motor control; Direct Torque Control (DTC) is an advanced motor control method for AC drives. The inverter's switching is directly performed by the core variables of the motor such as flux and torque. control.
The measured motor current and DC voltage are input to the adaptive motor model. The model generates a set of accurate torque and flux actual values ​​every 25x10-65. The motor torque comparator adjusts the actual value and torque. Comparing the given values ​​of the device, the flux comparator compares the actual value of the flux with the given value of the flux given regulator, and relies on the outputs from the two comparators to optimize the pulse selector to determine the inverter. The best switch position.
The enhanced tracking start function of the ACS10 is an improved version of the tracking start and integral start in the ordinary converter Shandong tinplate. The ACS100 is able to detect the running state of the motor in a very short time, so a quick start is allowed under all conditions. After using the tracking function, the starting performance is greatly improved. However, there is also a DC link overvoltage fault. For this reason, the speed correction value is added to the tracking, which solves the problem of generating the power generation brake at the time of starting.
According to the performance of the motor, the magnitude of the boost is not required to be too large. Therefore, using the S-curve start-up scheme, the acceleration time is increased from 905 to 1205, the shaping time is from 25 to 15, and the deceleration time is raised to 2405. During the debugging process, the test changes the shaping time to 105, and the operation is found after the operation. The medium DC bus voltage sometimes increases. In the acceleration time is 1205, the shaping time is 155, the DC bus voltage is stable, and there is no overshoot in the starting process and speed raising process.
The effect is adjusted by the above scheme, the inverter is easy to start, and is affected by the power grid. The total voltage drop adjustment and capacitance compensation can be restored. In the debugging process, the motor is first identified by m, and then the no-load test run is performed. The equipment is running normally during the whole starting process and running process. However, after reloading the load, the above figure often appears during the starting process, and the inverter displays faults such as DC link overvoltage and inverter overcurrent. Sometimes DC circuit overvoltage and inverter overcurrent faults occur during operation. The total drop can not adjust the voltage, the capacitor compensation is not afraid to switch, the inverter often trips, which seriously affects the production.
From the process point of view, in the heating process before the kiln tail fan operation, the kiln tail electric dust collector fan is already running, and its operation drives the kiln tail fan, so that the kiln tail fan has a certain speed. During the starting process of the kiln tail fan, the starting speed of the motor is less than the speed of the fan, so that the inverter is in the braking state, the motor is in the generating braking state, and the mechanical energy is converted into kinetic energy, which causes the DC bus voltage of the unit to rise, and in this state Next, in order to start the motor, the motor current will rise rapidly.
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