A Control Method Used to Prevent Burnout of Variable Frequency Motor

Abstract

The invention discloses a control method for preventing the burning of the frequency conversion motor, which includes: the action control flow of the loading and tapping machine: 1) the loading and tapping machine receives a start command; 2) the frequency conversion motor starts to act; 3) PLC Judging whether the loading and tapping machine is in place, if so, start the next step, if not, the frequency conversion motor continues to move. The invention redesigns the state of the brake opening feedback signal and the start command logic of the frequency converter control word, so as to avoid heating and insulation damage of the motor caused by online adjustment of the electric brake.

Description

technical field [0001] The invention relates to the technical field of automatic control of slab heating furnaces, more particularly, to a control method for preventing the burning of variable frequency motors, in particular to a safety control method for electric brakes of heating furnaces and tapping machines. Background technique [0002] Heating furnace installation and tapping machine are the essential key equipment for heating furnaces in rolling mills at home and abroad. Among them, the steel loader installed on both sides of the furnace entering and exiting the furnace mainly lifts the slab on the furnace entry roller table and places it smoothly in the furnace through the lifting arm and the translation arm. Similarly, the tapping machine mainly uses the lifting arm. A device that lifts the heated slabs in the furnace and places them on the roller table smoothly. [0003] During the process of heating furnace installation and tapping machine, their lifting arm and ...

AI Technical Summary

Problems solved by technology

[0008] When the electric brake is adjusted online, the brake command is forced at the PLC, and the control word of the inverter will be set to start, but at this time the inverter does not receive the given speed value, which will greatly increase the excitation current of the motor, resulting in Heat generation, insulation damage

More seriously, when the gap is adjusted after the new brake is replaced online, the motor will heat up and burn out, causing the production line to shut down for a long time

[0009] When adjusting the clearance of the electric brake on-site, the frequency converter needs to be in the standby state. If the frequency converter is repeatedly started and stopped to cooperate with the test, although the method of powering off the frequency converter can avoid the increase of the excitation current, it is not conducive to online adjustment, and will Greatly increase exception handling time, time-consuming and labor-intensive

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