Common Faults of Inverter-6
Overheat protection (OH):
1. Check whether the plug of the temperature switch line is plugged in properly, and use a multimeter to detect whether the temperature switch line is disconnected. If it is disconnected, it can be concluded that the temperature switch line is broken or the temperature switch is damaged.
2. Bad fan leads to overheating protection.
3. The ambient temperature is too high, the heat dissipation effect is poor, and the internal temperature of the inverter is high, resulting in overheating protection.
4. For the seven-unit IGBT inverter with a rectifier bridge, the temperature detection is based on the resistance change of the thermistor inside the IGBT. If the "OH" overheat protection occurs, the reasons are as follows: ① Comparator Bad, the output is high level. ②The comparator compares the value of the resistance, and the comparison voltage is lower. ③ The resistance of the thermistor inside the IGBT is abnormal.
