What are the operating requirements for the medium frequency induction heating power supply during startup and smelting?

We all know that we must be very careful when operating medium frequency induction heating power supplies. We need to always pay attention to changes in factors such as current, voltage, temperature and power to operate normally. So how can we operate it correctly? The editor will share with you a few key points below:

(1) Wear gloves and close the six manual switches under the power distribution cabinet, and observe whether the incoming line voltage on the medium-frequency induction heating power supply panel matches the supply voltage, and the three-phase incoming line voltage is required to be balanced.

(2) Start the incoming line voltmeter on the power supply cabinet to display the supply voltage, the power-on indicator light t is negative and de (yellow) is on, and the inverter power supply signal light (red) is on. First, turn the power potentiometer counterclockwise to the zero position (to the bottom) , press the inverter work button (green), the inverter work indicator light (green) lights up, and the DC voltmeter pointer on the panel should be below zero scale.

(3) To increase the power, first slightly adjust the power potentiometer clockwise. At this time, pay attention to the establishment of the intermediate frequency frequency and hear the whistling sound, which means that the intermediate frequency induction heating power supply has been started successfully. Only then is it allowed to turn the power potentiometer clockwise. Rotate the direction slowly. Do not increase the power quickly. Instead, increase the power slowly. If the intermediate frequency is not established yet, turn the potentiometer back and restart:

(4) When turning on the power, if it is found that there is no or abnormal sound in the intermediate frequency, do not force the start. The potentiometer should be moved counterclockwise to the bottom, and then restarted. If it fails several times, it should be stopped for inspection.

(5) In the early stage of charging (when continuously loading steel ingots), the power should be adjusted to 2000kW to leave a margin in the power adjustment potentiometer (the potentiometer must not be fully adjusted) to prevent sudden increases in power and current during the charging process. High, causing damage to the thyristor. After charging is completed, slowly increase the power to more than 3000kw.

(6) When charging in the middle and late stages of the smelting process, the power should be reduced to 2000kW (lower power). After the charging is completed, slowly adjust the power to above 3000KW to prevent power loss during the charging process. The current suddenly increases, causing impact damage to the thyristor.

(7) If there is material overlap in the furnace, the power adjustment potentiometer must not be fully adjusted at this time, and the power must not be operated at high power. The power should be controlled at 2000kw to prevent steel ingots from suddenly falling into the furnace and causing a sudden increase in power and current. , causing impact damage to the gate tube.

(8) During the smelting process, if you find that the system suddenly shuts down, you should carefully identify the cause of the shutdown, and carefully check whether the power cabinet and the intermediate frequency power supply system are leaking, whether the pressure is normal, and whether there are signs of ignition. Do not blindly restart the intermediate frequency power supply. Prevent the fault from expanding and causing damage to the power supply system, transistor, thyristor and main board.

(9) After confirming that everything is normal after closing, hang a "power on" warning sign on the manual switch of the medium frequency induction heating power supply.