Grid Voltage Abnormal

What does 301 mean?

A major fault indicating that the connected grid voltage is outside the allowed range, or there is a large difference in voltage among the three phases, or a power outage/AC line disconnection. This prevents grid synchronization and power export, leading to inverter shutdown.

• The grid A, B, or C phase voltage is less than the allowed range (Reason ID = 1 to 6).
• The grid A, B, or C phase voltage is higher than the allowed range (Reason ID = 13 to 18).
• The grid voltage is higher than the allowed range (Reason ID = 26).
• There is a large difference in grid voltage among the three phases (Reason ID = 27 or 28).
• The grid has a power outage, or the AC line or the AC circuit breaker is disconnected (Reason ID = 29).

Click steps to track your progress.

1. 1

   For Reason ID = 1 to 6, observe if the SUN2000 automatically reverts to normal operating status if the alarm occurred accidentally.

2. 2

   For Reason ID = 1 to 6, if the alarm occurs repeatedly, check if the grid voltage is within the allowed range. If so, change the grid overvoltage and undervoltage protection points after obtaining approval from the local power operator (refer to 7.2.9 Setting Protection Parameters).

3. 3

   For Reason ID = 1 to 6, if the alarm persists for a long time, check that the AC circuit breaker and output cables of the SUN2000 are properly connected.

4. 4

   For Reason ID = 13 to 18, or 26, check if the grid-tied point voltage is too high. If it is higher than the allowed range, change the overvoltage and undervoltage protection points after obtaining approval from the local power operator (refer to 7.2.9 Setting Protection Parameters). Also, check whether the grid voltage peak is too high.

5. 5

   For Reason ID = 27 or 28, observe if the SUN2000 automatically reverts to normal operating status.

6. 6

   For Reason ID = 29, check whether the AC voltage is normal and whether the AC line or circuit breaker is disconnected.