Brake Chopper IGBT Excess Temperature

What does A79C mean?

The Insulated Gate Bipolar Transistor (IGBT) within the brake chopper has exceeded its internal temperature warning limit. This indicates excessive heat generation due to sustained braking, inadequate cooling, or an overdriven chopper, risking damage to the power components and potentially causing drive failure.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify proper function of the drive's cooling fan and ensure no airflow obstructions exist.

2. 4

   Review the sizing and ventilation of the electrical cabinet enclosing the drive.

3. 5

   Inspect brake resistor overload protection settings (parameters 43.06 to 43.10) for correct configuration.