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SMA America, LLC 10 Troubleshooting
Installation Manual SB30-40-US-IA-en-34 77
10.4.3 Resetting "Error AFCI" Disturbance
If the message "Error AFCI" is displayed, an electric arc has been detected in the PV system. The AFCI
is triggered and the operation of the inverter is permanently inhibited.
1. Turn the rotary switch of the DC Disconnect to the Off position.
2. Wait until the display and all LEDs switch off.
3. Perform troubleshooting in the PV system. Ensure that the correct open-circuit voltage values are
present at all PV strings.
4. Turn the rotary switch of the DC Disconnect to the On position.
☑ The message "Error AFCI. Knock to reset." is displayed.
✖ Is the message "Error AFCI. Knock to reset." not displayed and is the yellow LED flashing?
Possible cause of error: The solar irradiation is insufficient and the AFCI self-test cannot be
performed successfully.
• If the AFCI self-test continues to be unsuccessful, turn the rotary switch of the DC
Disconnect to the Off position and switch off the AC miniature circuit-breaker.
• If the AFCI self-test is consistently unsuccessful, contact the SMA Service Line
(see Section 15 "Contact", page 99).
5. If the message "Error AFCI. Knock to reset." is displayed, tap the enclosure lid within 10 s.
☑ The green LED glows permanently and the inverter feeds into the power distribution grid.
✖ Is the green LED not glowing permanently and is the inverter not feeding into the power
distribution grid?
Possible cause of error: You did not tap the enclosure lid within 10 s of the message
appearing.
• Repeat steps 1 to 5.
XFMR_TEMP_W After high transformer temperatures are reduced, the inverter restarts feed-
in operation.
Corrective measures:
• Ensure that the fan is functioning correctly (see Section
11.3 "Checking the Fan", page 81).
Danger of fire due to electric arc in the PV plant
Risk of death or serious injury.
•Only test the AFCI for false tripping in the order described below.
• Do not deactivate the AFCI permanently.
Message Cause and corrective measures