Overcurrent on DC side (PV1)

What does 502 mean?

The Fronius Primo GEN24 208-240 inverter has detected an excessive current flowing from the PV1 string on the DC side. This indicates a potential short circuit within the PV1 array or an incorrect string configuration.

• Overcurrent on the DC side (PV1).
• Short circuit on the PV array.
• Incorrect PV array sizing or configuration.

Click steps to track your progress.

1. 1

   Disconnect the PV1 string using the DC disconnector and inspect all PV modules, wiring, and connectors for signs of damage or short circuits.

2. 2

   Measure the open-circuit voltage (Voc) and short-circuit current (Isc) of the PV1 string and compare them against expected values based on module specifications.

3. 3

   Verify that the PV1 string configuration (number of modules in series and parallel) is within the Fronius Primo GEN24 208-240 inverter's maximum current limits.

4. 4

   Check for any external DC combiner box or array wiring that might be causing a short circuit condition.

5. 5

   If all external checks pass, the issue may be internal to the inverter; contact Fronius service.