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Common faults of medium-frequency induction furnaces?
Aug 26,2020
Fault phenomenon one
Number 1 Medium-frequency furnace At startup, the reactor vibrates heavily, makes unusual noises, and the door shakes.
Reason 1: The reactor coil is burned out or the coil is grounded.
2. The capacitor has broken down and is now shorted to the enclosure. (The discharge coil must be removed before measurement can be performed.)
3. It might be necessary to close the switch that shorts the reactor.
Fault phenomenon No. 2
The intermediate-frequency furnace trips when the iron slag inside the furnace melts into molten iron.
Reason 1: The furnace lining may have become too thin, leading to breakdown and causing the current to exceed the rated value.
2. The potentiometer on the motherboard might not be properly adjusted (W3/W4). Try to maintain a ratio of 1 between the intermediate-frequency voltage and the DC voltage. Fault phenomenon No. 3.
The medium-frequency furnace’s power cannot be adjusted, and the voltage won’t rise.
The reason is that the motherboard’s power level hasn’t been adjusted properly. Adjust potentiometers W1 and W2. (You need to reduce the power output in order to adjust the various potentiometers on the motherboard.)
Fault phenomenon five
The water cable connected to the medium-frequency furnace was experiencing severe heating at the connection point, with noticeable signs of burning and oxidation. After grinding down the heated and oxidized area on the 18th, the contact surface began to heat up and discolor again on the 19th. Upon removal, we discovered that the water cable had broken—apparently, it was a single water cable conducting electricity, which caused the overheating.
Fault phenomenon six;
The 3T intermediate-frequency furnace experienced a power trip; after restarting, check the current and voltage.
With each rise and fall, the indicator light on the capacitor circuit board and the six indicator lights on the motherboard would flicker—turning on and off repeatedly. Later, after adjusting w3, w4, and W6, the situation improved slightly, and the device was temporarily usable. Preliminary assessment suggests that the furnace is about to break down, as its walls have become too thin.
Fault phenomenon seven
After closing the switch of the medium-frequency furnace, adjusting the potentiometer results in an overcurrent trip. Alternatively, there’s no display at all, no trigger output, and the control circuit produces no output—investigate further. After removing wire No. 214 from the main board and then closing the switch again, adjusting the potentiometer still fails to raise the DC voltage. This suggests either: 1. The thyristor is damaged, or 2. The main board itself is defective. In this case, it turns out that the main board is indeed faulty.
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Kangda Electric Furnace specializes in the manufacture of the following equipment: KGCL series medium-frequency power supplies, KGPS series medium-frequency power supplies, GTR series medium-frequency induction heating furnaces...
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Address: Yuhe Industrial Park, Weicheng District, Weifang City, Shandong Province
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