Insulation fault on PV generator (PV2)
Fronius · Primo GEN24
¿Qué significa 302 ?
The Fronius Primo GEN24 208-240 inverter has detected an insulation fault (ground fault) on the PV generator (PV2 string). This indicates an unintended electrical path between the PV array's DC conductors and ground, which is a safety hazard and stops power generation.
Causas comunes
- Insulation fault on PV generator (PV2).
- Water ingress into PV modules or junction boxes.
- Damaged PV cable insulation (e.g., rodent damage, mechanical stress).
Pasos de reparación & Lista de verificación
Haga clic en los pasos para seguir su progreso.
- 1
Safely disconnect the PV array (PV2) from the Fronius Primo GEN24 208-240 inverter using the DC disconnector and AC breaker.
- 2
Using a megohmmeter (insulation resistance tester), measure the insulation resistance of the PV2 string to ground (PV+ to ground, PV- to ground) - expect >1 MΩ.
- 3
Visually inspect all PV modules, cables, and connectors for the PV2 string for any signs of damage, moisture ingress, or degradation.
- 4
Check all junction boxes and combiner boxes for moisture, corrosion, or loose connections.
- 5
If the fault persists, isolate individual PV modules or sections of the PV2 string to pinpoint the exact location of the insulation fault.