SMA STP 50-40 - Resetting the Operation Inhibition after Detection of an Arc Fault

11 Troubleshooting
SMA Solar Technology AG
Operating manual STP50-4x-BE-en-23 115
6. Set the test voltage. The test voltage should be as close as possible to the maximum system
voltage of the PV modules but must not exceed it (see datasheet of the PV modules).
7. Measure the insulation resistance.
8. Eliminate the short circuit.
9. Measure the remaining strings in the same manner.
☑ If the insulation resistance of a string deviates considerably from the theoretically
calculated value, there is a ground fault present in that string.
10. Reconnect to the inverter only those strings from which the ground fault has been eliminated.
11. Reconnect all other strings to the inverter.
12. Recommission the inverter.
13. If the inverter still displays an insulation error, contact the Service (see Section15, page125).
The PV modules might not be suitable for the inverter in the present quantity.
11.5 Resetting the Operation Inhibition after Detection of an
Arc Fault
If the red LED is glowing and the event number 4301 or 4302 is shown in the event list on the user
interface of the inverter, the inverter has detected an electric arc and interrupts feed-in operation.
Procedure:
1.
DANGER
Danger to life due to electric shock
• Disconnect the inverter from any voltage sources (see the inverter installation manual).
2. Ensure that the PV modules, the connected DC cables and the terminal block for the DC
connection are not defective.
3. Repair or replace defective PV modules, DC cables or terminal block for the DC connection.
4. Recommission the inverter (see inverter installation manual).
5. Open the user interface (see Section8.2, page61).
6. Log into the user interface as an Installer (see Section8.3, page65).
7. To reset the operation inhibition, select the parameter Reset operating data and set it to
Reset operation inhibition or select the parameter AFCI switched on and set it to No and
then back to Yes.
☑ This effects resetting of the operation inhibition and the inverter will start feeding in again.