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the pressure in the furnace decreases, bing a set of closed-loop regulation system. The furnace pressure is kept at 150pa by automatic adjustment to reach the process control beters. The motor is allowed to start automatically inside. The output current of the AC frequency converter is set to 500A. 3 Functional Item Setting Will Start and stop motor operation beters and motor data b AC variable frequency governor, select the Direct torque control and motor identification operation, the characteristic of the motor can be distinguished to find the control strategy of the motor. The starting command b of a pair of normally open-point contact AC converters of KA4 and Kas is used as the starting signal. The instrument feedback control signal is connected to the given speed b of the AC inverter as the given speed signal. The given signal of remote control is 4-20 Ma, the lower limit of operating frequency 10 hz corresponds to 4 ma, and the upper limit of 50 hz corresponds to 20 ma. The acceleration time is 305 and the deceleration time is 4min. Problems and solutions of AC variable frequency governor in 854 when power grid fluctuates. When the AC inverter is running, it will disturb the display screen of the power equipment, especially the computer. The jitter of the display screen is serious, which will affect the normal use of the machine.

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DI801