A: 1. Check whether the voltage of the switchgear at the front end of the inverter is normal
 2. Check whether the inverter input voltage coefficient is normal; the default is 100%. 
3. Check whether the voltage detection board is working properly and verify its specifications and model
 4. If the actual measured voltage matches the customer's on-site voltage, adjust the input voltage detection coefficient to keep the inverter and the customer's site voltage consistent, avoiding system misidentification of undervoltage and accidental tripping