PFXA 401F  3BSE024388R3 | ABB | Control algorithm design

Description

PFXA 401F  3BSE024388R3 | ABB | Control algorithm design

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PFXA 401F   block diagram of the hard synchronization and open-loop tension closed-loop vector control scheme is shown in Figure 2. Please refer to Table 1 for system configuration.
In order to overcome the drawbacks of increased motor slip and soft motor characteristic curve caused by changes in load, encoder feedback is added to the motor of each unit, and the encoder signal is connected to the frequency converter to form closed-loop vector control. This way, the characteristic curve of the motor will be relatively hard, which can effectively avoid the decrease in speed and torque when the load changes slightly. Achieve the effect of hard synchronization control. The frequency setting method of all unit frequency converters is through RS485, which not only omits the synchronous controller, but also effectively avoids the interference of electrical coupling on analog signals. The system runs more stably and has lower costs, and the control effect is also better

3.2 PFXA 401F   Control Algorithm Design
PFXA 401F   speed is also mainly based on 1 unit, and is generally set as linear speed on the human-machine interface. The linear speed needs to be converted into the corresponding frequency. Due to the mechanical differences between Unit 1 and Unit 2, as well as factors such as slipping of the transmission medium, it is inevitable that the operating frequencies of Unit 1 and Unit 2 frequency converters cannot be completely consistent, and there exists a certain coefficient relationship. Similarly, there are different coefficient relationships between units 2 and 3, between units 3 and 4, between units 4 and 5, and between units 5 and 6. Process the velocity relationship between every two units using the following algorithm: Vn=Kdn * Vn-1+Kfn * Vn-1. The core and programming ideas of the entire control are shown in Figure 3.

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