What to do when the inverter circuit of the crucible is difficult to start
Release time:
2022-03-02
Crucible During use, the inverter circuit will be difficult to start. What is the reason for this? What should we do?
1. Water-cooled cable open circuit, copper busbar burned out due to output load.
2. Capacitor casing short circuit to ground: At this time, we need to check for water leakage, whether there is too much dust accumulation on the capacitor base, and whether the capacitor porcelain base is missing.
3. Check whether the insulation of the current transformer is damaged; first remove the current transformer and check whether its insulation is good; use a multimeter to measure whether the coil is burned out and whether the wiring sequence is correct. If everything is normal, it is necessary to check whether the output value of the potentiometer used to adjust the current signal is too small, and readjust the amplitude of the output current signal.
5. Inter-turn short circuit of the induction coil: If the induction coil cannot be cooled for a long time, the insulation will be damaged, leading to an inter-turn short circuit. Conductive objects such as dust and scale on the induction coil can also cause inter-turn short circuits. Ignition occurs when the medium-frequency power supply is started, and frequent ignition will cause the induction coil to break down. For this reason, it is necessary to clean up the debris on the surface of the induction coil and brush insulating paint or asbestos board on it.
6. Short circuit of the copper busbar connecting the medium-frequency output end and the induction coil: Foreign objects or improper fixing of the copper busbar can cause a short circuit between the copper busbars.
7. Check the size of the inverter angle of the inverter circuit. If the inverter angle is too small, the inverter angle needs to be adjusted; if the inverter angle is normal, check whether the current polarity is reversed. If not, check whether the thyristor of the inverter has a trigger pulse. If normal, check whether the thyristor of the inverter is damaged. If damaged, replace it with a thyristor of the same type and specification.
The reasons why the crucible inverter circuit is difficult to start or cannot start during use are explained. While explaining the reasons, the methods of handling are also explained, hoping to be helpful to everyone.
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