When the frequency inverter runs at constant speed, DC voltage of the main circuit exceeds this set value.

Detected DC over-voltage value:

Level S1 : 240V

Level S2/T2 : 400V

Level T4 : 800V

• Check whether the input voltage is too high;
• Check whether the bus voltage display is normal;
• Check whether the motor is dragged to run by external force in the running process;