SMA WB 3300-11 Installation - Manual (Page 63)

SMA Solar Technology AG Troubleshooting
Installation Manual WB33-38-IA-IEN120940 63
3. Release and disconnect all DC connectors. To do
this, insert a flat-blade screwdriver
(blade width: 3.5 mm) into one of the side slots and
pull the DC plug connectors out. Take care
NOT TO PULL ON THE CABLE.
4. Remove the AC connection socket from the inverter.
5. Disconnect L1, L2 and L3 of the small wind turbine system from the Windy Boy Protection Box.
6. Measure the resistance between the phases of the small wind turbine system and the earth
potential:
– Measure the resistance between L1 of the small wind turbine system and the earth potential.
– Measure the resistance between L2 of the small wind turbine system and the earth potential.
– Measure the resistance between L3 of the small wind turbine system and the earth potential.
Result What to do
The measured resistance is virtually infinite.
☑ There is no earth fault in the small wind
turbine system.
There is probably an earth fault in the
Windy Boy Protection Box or in the supply
cables to the inverter.
• Disconnect the Windy Boy Protection Box
from the inverter and measure the
resistance of all connections and the earth
potential.