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Error Code - 318 - Abnormal Residual Current - Alarm Severity Major

Alarm ID
Alarm Name
Alarm Severity
Possible Cause
Abnormal Residual Current
  • Cause ID = 1
The insulation resistance against the PGND cable at the input side decreases when the SUN2000 is running, which causes an excessively high residual current.
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.

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