A ton of smelting furnace can start but can't adjust the intermediate frequency voltage.

Fault analysis and processing: The fault phenomenon does not belong to the intermediate frequency power supply fault, but is caused by the low impedance of the load, and the load impedance must be readjusted.

1 ) In the circuit of boost load, it is removed due to the damage of the series compensation capacitor, and there is no replacement, or the most demanding high-power and uncontrolled increase of the compensation capacitor, so that the compensation amount of the load is over compensated, this will cause this. Failure phenomenon. The solution is to readjust the compensation amount of the compensation capacitor so that the device can operate at rated power.

2 ) The sensor has a short circuit between the turns - if the sensor has a short circuit between the turns, the impedance of the load will also decrease, causing this malfunction. There are two possibilities for short circuit between turns:

The copper tube of the inductor is directly shorted

The fixed bakelite column of the sensor is severely carbonized. Due to the conductive property of the carbon, the carbonized bakelite between the inductors causes the direct connection between the turns to cause short circuit between the turns of the inductor.

Without the intermediate frequency voltage, the typical inverter is not successful. Sometimes there is a current sound, and the DC current meter is also displayed. However, there is no intermediate frequency voltage, and the current will be overcurrent protection as long as it is larger. So you should focus on checking the inverter part:

1 Check the inverter silicon for breakdown, and measure it between 5-10K with 1K .

2 Check whether there is breakdown of the power and dynamic capacity. Generally, the simple method uses 1 Euro and no breakdown.

3 Check the water cable for open circuit.

4 Check the furnace ring for breakdown, it is best to change the furnace ring to start the test, even if there is no coil for building the furnace charge.

5 Check the copper wire screws for discoloration and heat contact.

6 Change the feedback transformer and check the feedback loop.

7 Check the inverter silicon for the inverter trigger pulse.

8 protection circuit has no malfunction.

I don't know if you understand this. In short, this is a comprehensive problem. As long as you master the rules and accumulate more experience, you can do more with less. If you don't understand, you can communicate further.