1. inverter acceleration time is too short, causing the process to start or accelerate, leading IGBT instantaneous current is too large, resulting in IGBT protection;

2. the inverter is running at drive failure may be due to sudden load is too large, resulting in instantaneous overcurrent device, making unit IGBT overcurrent protection, severe cases may cause IGBT damage;

3. IGBT protection circuit board unit driven by the abnormal interference could lead to false positives, or the driver board itself is damaged, it may result in reported drive failure;