Abnormal residual current

What does 2051 mean?

The input-to-ground insulation impedance has decreased during the SUN2000 operation. This typically indicates an insulation fault or a temporary issue with external power cabling.

• The input-to-ground insulation impedance has decreased during the SUN2000 operation.
• The external power cable may be abnormal temporarily.

Click steps to track your progress.

1. 1

   Monitor if the alarm occurs accidentally and the SUN2000 automatically recovers after the external power cable abnormality is rectified.

2. 2

   If the alarm persists or lasts a long time, check whether the impedance between the PV string and ground is too low.