Under-voltage in the main circuit, check the electric level:

Detected DC under-voltage value:

Level S1 : 100V

Level S2/T2 : 200V

Level T4 : 350V

• Check the lines of supply power contact well;
• Check whether the incoming voltage is within regulated scope;
• Check whether there is momentary interruption;
• Check whether the display of the bus voltage is normal;
• Check whether the setting bridge and charge resistance are normal;