The tH1o error code you're encountering indicates an IGBT temperature detection failure in your Delta MS300 series drive. 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.