SMA WINDY BOY 3300 - Red LED Is Glowing Continuously; Checking the Small Wind Turbine System for a Ground Fault

SMA Solar Technology AG Troubleshooting
Installation Guide WB33_38-IEN101830 57
9.3 Red LED is Glowing Continuously
If the red LED of the status display is continuously on during operation, there is either a ground fault
in the system or at least one of the varistors for the overvoltage protection is defective.
In intentionally grounded systems, the red LED has been lit up since the commissioning of the inverter.
However, this has no impact on the functioning of the inverter. Before you check the small wind turbine
system for a ground fault, make sure an intentional connection to the ground has been carried out.
With intentionally grounded small wind turbine systems, check occasionally that the varistors inside
the inverter function correctly, since a fault with the varistors can no longer be displayed.
9.3.1 Checking the Small Wind Turbine System for a Ground Fault
1. Wait until LEDs have gone out.
2. Ensure there is no current at any DC cables using a
clip-on ammeter.
☑ If there is a current present, check the
installation.
DANGER!
Danger to life due to high voltages in the inverter.
• Stop the small wind turbine system and ensure that it can not restart accidentally.
• Disconnect the line circuit breaker and secure against re-connection.
DANGER!
Danger to life due to high voltages in the inverter.
The capacitors in the inverter require 15 minutes to discharge.
• Wait 15 minutes before opening the inverter.