The tH1o fault in delta drive indicates an IGBT temperature detection failure. IGBT (Insulated-Gate Bipolar Transistor) is a critical component within the drive that controls the power flow to the motor.

This fault comes when the IGBT temperature is higher than the protection level, and detection time exceeds 100 ms, the tH1o protection activates.

• Wait for 10 minutes, and then cycle the power.