Overvoltage on DC side (PV2)
Fronius · Primo GEN24
What does 506 mean?
The Fronius Primo GEN24 208-240 inverter has detected an excessively high voltage from the PV2 string on the DC side, exceeding its maximum input voltage rating. This poses a risk of damage to the inverter's DC-DC stage.
Common Causes
- Overvoltage on the DC side (PV2).
- Incorrect PV array sizing (too many modules in series).
Repair Steps & Checklist
Click steps to track your progress.
- 1
Disconnect the PV2 string using the DC disconnector and measure the open-circuit voltage (Voc) of the PV2 string.
- 2
Compare the measured Voc with the maximum DC input voltage specification for the Fronius Primo GEN24 208-240 inverter.
- 3
Verify the number of PV modules in series for PV2; ensure it does not exceed the inverter's maximum voltage rating, especially at cold temperatures.
- 4
Check for any miswiring or faulty components in the PV2 string that could result in an unexpectedly high voltage.
- 5
If the array configuration is validated and within specifications, power cycle the inverter to clear the fault. If the error persists, contact Fronius service.