|Alarm ID||Alarm Name||Alarm Severity||Possible Cause||Suggestion|
|318||Abnormal Residual Current||Major||1. If the alarm occurs accidentally, the external circuit may be abnormal temporarily. The SUN2000 automatically recovers after fault is rectified.|
2. If the alarm occurs repeatedly or persists, check whether the impedance between the PV string and the ground is excessively low.