A Breakdown Of The Igbt Module Caused A Secondary Fault On The Motor Side Of The Frequency Converter.

When a short-circuit current occurs at the output terminal of 240v 50hz to 120v 60hz converter, the connecting cable will generate a strong electromagnetic pulse. This transient interference can couple to the control signal lines, causing PLC malfunctions and sensor data corruption. On automated production lines, it may trigger the emergency stop protection of the entire line.

When the motor windings are subjected to a sudden short-circuit current, the insulation system suffers severe electrical stress. Even if the motor does not burn out immediately, its inter-turn insulation strength is significantly reduced. This makes insulation breakdown more likely during subsequent operation, creating a vicious cycle.

The impact of power device breakdown far exceeds the loss of the module itself. Systemic circuit damage, production interruption losses, and shortened motor lifespan—these hidden costs are often several times the direct repair costs. Establishing a comprehensive preventative maintenance system, regularly checking the operating status of IGBTs, and promptly replacing aging components are essential to reducing the risk of sudden failures and ensuring the long-term stable operation of the single phase frequency converter system.