Disconnecting The Inverter From Voltage Sources - SMA SUNNY ISLAND 4.4M Operating Manual

12 Disconnecting the Inverter from Voltage Sources

12 Disconnecting the Inverter from Voltage Sources
Procedure:
1. Stop the system: At the master, or at the master of the main cluster, press the "Start-Stop" button until an acoustic
signal sounds.
2. If the orange LEDs for the inverter are lit on all devices, the system has been stopped.
3. Switch off Sunny Island: On the master, or on the master of the main cluster, press the "Off" button until an
acoustic signal sounds.
4. If the inverter LED is no longer lit on any of the devices, the devices have been switched off.
5. Disconnect the circuit breakers and the load-break switches in the sub-distributions and secure against
reconnection.
6. Open the load-break switch in the battery fuse and secure against reconnection.
7. Wait 15 minutes. This enables electric discharge of the capacitors in the inverter.
8.
Destruction of the Sunny Island inverter due to electrostatic discharge (ESD)
By touching electronic components within the Sunny Island, you can damage or destroy the Sunny Island.
• Ground yourself before touching any component.
9. Unscrew all six screws of the enclosure lid using an Allen key (AF 5) and remove the enclosure lid.
10. Ensure that no voltage is present between DC+ and DC-.
11. Ensure that no voltage is present at the AC1 and AC2 terminals.
12. Ensure that no voltage is present at the ExtVtg terminal.
13. Ensure that no voltage is present at the Relay1 and Relay2 terminals.
14. Ensure that no voltage is present at the BatTmp, BatCur, BatVtg and DigIn terminals.
15. Ground and short-circuit the AC power cables outside the Sunny Island.
16. Cover or isolate any adjacent live components.
126 SI44M-80H-13-BE-en-15
NOTICE
SMA Solar Technology AG
Operating manual