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1. Turn on the power supply and slowly increase the power potentiometer to bring the intermediate-frequency voltage up to 750V. Then, turn the overvoltage protection potentiometer W8 clockwise until the overvoltage protection is activated, causing the overvoltage indicator light to illuminate.

2. When the power potentiometer returns to zero, the quenching equipment automatically resets the protection system. Rotate the overvoltage indicator w82-3 counterclockwise to release the limit voltage potentiometer.

3. Restart the power supply to bring the medium-frequency furnace voltage to between 800V and 820V. Turn the potentiometer W88 clockwise until the medium-frequency power supply’s overvoltage protection is triggered, causing the overvoltage indicator light to illuminate again. This verifies that the overvoltage protection setting is accurate.

4. Restore the voltage limit value and adjust the voltage limit value to fine-tune the ratio between the intermediate-frequency overvoltage and the DC intermediate-frequency overvoltage.

Two
Medium-frequency furnace power supply Pressure-limiting adjustment

Turn on the power, start the inverter, and slowly increase the power potentiometer to gradually raise the intermediate-frequency voltage to 750 V clockwise.

2. Use the voltage-limiting potentiometer W9 to ensure that the intermediate-frequency voltage does not rise as the power potentiometer is rotated.

3. When the voltage of the medium-frequency induction furnace drops below 750 V, debugging issues may occur.

There are three reasons for this:

1. First, slightly adjust the current by turning the current-limiting potentiometer counterclockwise.

2. Observe whether the intermediate-frequency voltage has increased.

3. If improvement is not possible, the transfer should be halted.

Three
Debugging the Current-Limiting Function of the Medium-Frequency Furnace
1. First, start the power supply without any load to verify its basic startup performance and ensure that all instruments are functioning properly.

2. Fill the medium-frequency furnace with raw materials, preferably large-sized chunks. Adjust the charge amount in the medium-frequency furnace (charge inside the furnace; heavy charge).

3. Slowly turn on the power supply; the furnace should start up smoothly and perform well. If the intermediate-frequency voltage is difficult to establish or the startup is challenging, adjust the potentiometer signal on the ceramic disc to increase the inverter’s phase angle.

4. Once the startup is slow, the current regulator cannot increase along with the rise in the power supply potentiometer.
Four, Medium-frequency furnace Overcurrent adjustment
1. Slowly turn on the power supply to bring the current up to its rated value, then adjust the current-limiting device W8 to trigger the overcurrent protection.
2. Loosen the current-limiting potentiometer Ws, and turn the overcurrent potentiometer W7 counterclockwise by two to three full turns.
3. When the power is turned on, the current reaches 1.2 times the rated current, and adjusting the current regulator W7 causes the overcurrent protection to activate.
4. If the overcurrent indicator light is on, repeat this debugging procedure once or twice to verify that the overcurrent value is indeed approximately 1.2 times the rated current.
Five
Medium-frequency furnace Several situations may arise during debugging:
1. Overcurrent protection that has not yet reached its rated value will operate first. At this point, simply adjust potentiometer W7 counterclockwise to increase the threshold value for overcurrent protection operation.

2. When the power potentiometer is set to its maximum position, the current still fails to reach the rated value, resulting in a large material hole and an unstable mid-frequency furnace. To address this, add small pieces of material into the areas with larger material holes, thereby solidifying these holes.

3. If the inversion angle is too small, the current cannot flow; simply increase the resistance value of the ceramic potentiometer for the 1 C signal.