Zhang Yongjiang (Zhejiang Dafeng Industrial Co., Ltd. Zhejiang Yu 315400) increased the remote operation and monitoring greatly facilitated the operator to avoid the disadvantages of the original operating air compressor must go to the field electrical room to improve the operation to a certain extent Staff efficiency. In order to reduce the cost and operate reliably, the Siemens S7-200 programmable controller is used for the disadvantage of starting the high-power motor with self-twisting transformer.
At present, in the factory, for the high-power motor of 36KW or more, the self-twisting step-down start is generally adopted. The common method is to provide a self-twisting transformer for each motor to start the step-down. This starting method increases the capital investment and Maintenance costs, and the use of time relays to control the reliability of the barriers, resulting in the self-destructive transformer can not be disconnected from the power supply and burned out. Another auto-coupling step-down starting circuit is not complicated operation in order to prevent the starting current in the autotransformer winding from being too large and the heat is damaged to damage the insulation of the autotransformer. If the first start is unsuccessful, the second start should be separated by more than 4 minutes, such as at 60. After two consecutive starts, the power is turned off for 4 hours and the operation is restarted. However, the original system cannot solve this problem from the circuit. It is necessary for the operator to comply with this rule, and the operator's wrong operation is also the cause of the autotransformer burning. Although the air compressor may work simultaneously according to the actual gas consumption during normal operation, these motors do not require the simultaneous operation of the geese according to the working characteristics of the air compressor to determine the technology of three 55KW air compressors in our company. Transformation. Germany's Siemens S7-200 series small programmable controllers are low in price, excellent in performance, large in program capacity, fast in operation, flexible in programming, etc. According to the actual situation of the project, we have selected the CPU224CN relay type, with 14 inputs and 10 outputs. The 256 timers are 6 counters and the user program has a capacity of 8 KB. The rated current of the relay dry contact is 2A, and the maximum of each common terminal is 10A. Therefore, the coil of the AC contactor can be directly driven and the intermediate relay mechanical circuit 2 circuit principle can be saved. 2.1 The main circuit of the main circuit is modified after the main circuit is technically modified. Loop circuit, such as do not control each motor and power on and off
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