The inverter has detected an arc fault.

This page describes how to troubleshoot arc fault issues.

To understand more about how arc fault detection works in Autarco Inverters go to Arc Fault Functionality and FAQ.

Possible causes are;

• Connections in junction boxes can degrade (oxidize) over time creating hot spots.
• Screw type terminal connections can come loose due to changes in temperature.
• Improper stripping length can result in wire insulation being captured in terminals.
• Improper crimping of DC terminals results loose connections and arcing.
• Improper connector assembly results in connection not being “locked” and arcing.
• DC connectors not fully mated causes arcing.
• Animals chewing through wires or wiring that has come loose and rubbed against the array racking can also lead to serial arcing.
• PV Panels are cracked or damaged.
• Firmware is out of date
• AFCI Board is damaged or connection to DSP is damaged

1. Ensure that all switches, breakers and fuses are working well and in the “On” position.
2. Check the grid standard
3. Turn the DC Switch Off and measure the AC voltages.

If the inverter has shutdown and gone in to full protect mode, the inverter can only be safely restarted after the cause of the arc fault has been identified and resolved. To restart the inverter;

1. Press ESC for 3 seconds

This is an inverter driven issue.

Issue Creation

If the inverter sends a single message with this type of alarm in a 24hr period an issue will be created.

Resolution:

If a 24hr period passes with good production, and not futher alarms, the issue will be automatically resolved.