Function

If PV modules or cables are incorrectly connected or damaged, electric arcs may be generated, which may cause fire. Huawei inverters provide unique arc fault detection in compliance with UL 1699B-2018 to ensure the safety of users' lives and property.

This function is enabled by default. The inverter automatically detects arc faults. To disable this function, log in to the FusionSolar app, access the Device commissioning screen, choose Settings > Feature parameters, and disable AFCI.

The AFCI function works only with Huawei optimizers or ordinary PV modules when the inverter is connected to the grid, but does not support third-party optimizers or intelligent PV modules.

Clearing Alarms

The AFCI function involves the DC arc fault alarm.

The inverter has the AFCI alarm automatic clearance mechanism. If an alarm is triggered for less than five times within 24 hours, the inverter automatically clears the alarm. If the alarm is triggered for five times or more within 24 hours, the inverter locks for protection. You need to manually clear the alarm on the inverter so that it can work properly.

You can manually clear the alarm as follows:

• Method 1: FusionSolar app
  Log in to the FusionSolar app and choose Services > Device commissioning. On the Device commissioning screen, connect and log in to the inverter that has generated the AFCI alarm, tap Alarm management, and tap Delete on the right of the DC arc fault alarm to clear the alarm.

  Figure G-1 Alarm management
  
• Method 2: FusionSolar SmartPVMS

  Log in to the FusionSolar SmartPVMS using a non-owner account, choose Monitoring > Details, click DC Arc Fault Clearance, and click OK.

  Figure G-2 Clearing alarms
  

  Log in using the owner account with plant management rights. Click the plant name on the Home page to access the plant page, and click OK as prompted to clear the alarm.