Description
Excitation controller GFD563A101 3BHE046836R0101 Working principle:
Exciting device GFD563A101 3BHE046836R0101 main circuit part
Composition and function of the main loop
The main circuit of the device completes the two functions of rectification and demagnetization. The system adopts three phase fully controlled bridge thyristor rectifer
circuit to provide DC excitation current to the rotor winding of synchronous motor. The degaussing circuit is composed of thyristor 7, 8KGZ and diode GZ in inverse
parallel, and actually consists of a high-power electronic switch, which completes the serial starting resistance of synchronous motor in the process of asynchronous
starting, and automatically cuts it out after the end of starting, so as to ensure that the rotor excitation winding is neither open nor short circuit during the asynchronous
starting of synchronous motor. So as to avoid the field winding under overvoltage and overcurrent.
Exciting device control GFD563A101 3BHE046836R0101 Part:
GFD563A101 3BHE046836R0101 System control part includes S7200PLC, Pro-face touch screen, KGLF-2 microcomputer excitation controller composed of three parts.
PLC is mainly responsible for the switching of the working mode of the relay loop logic control, the adjustment of PI during operation and external communication, etc.
Pro-face touch screen is mainly responsible for the system parameter setting and the query of the information of faults during operation, working time and set operation
parameters. Pro-face touch screen has the information of excitation current and excitation voltage recording curve.
KGLF-2 excitation controller GFD563A101 3BHE046836R0101 by the host MC87C51 and auxiliary AT89C51 microcontroller composed. Excitation controller mainly
completes frequency measurement and excitation, pulse formation, fault detection and processing.
Measurement of rotor induced voltage frequency
When the synchronous motor starts, the frequency of the rotor induced voltage decreases gradually with the rise of the speed. Once the synchronous motor starts, the
MCU immediately detects the time of the rotor induced half a cycle wave. From 20ms, the digital tube is marked“9″, and every 20ms in the middle, the digital tube is
reduced by 1. In the process of asynchronous starting, when the rotor speed reaches 90% of the synchronous speed, the rotor induced voltage frequency is 5Hz, the cycle
is 0.2s, and the half cycle time is 100ms. Once the computer detects the value, it will immediately throw the full voltage. After the full voltage is aplied, the motor’s speed
will continue to rise. When the speed increases to 95% of the synchronous speed, the rotor induced voltage frequency is 2.5Hz, the period is 0.4s, and the half cycle time
is 200ms. The computer detects this value. Quickly enter the rectifier procedure, output pulse, device into the excitation, at the same time through the excitation work
instructions, turn off low voltage magnetization and open the loss of magnetic protection and out of step protection.
2 Pulse formation
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