SMA SUNNY BOY 3000-US Installation Manual page 50

6 Electrical Connection
2. Press the insulated screwdriver upward and insert
the stripped cable into the spring terminal.
3. Remove the insulated screwdriver from the spring
terminal.
4. Carefully pull the cable to ensure that it is correctly connected.
Connecting the Combiner Box to the DC Disconnect
1. Open the DC Disconnect (see Section 9.3).
2. To connect the DC cables of the Combiner Box with negative polarity, connect the DC cables:
• Connect the DC+ cable to the "COMBINED" spring terminal of the DC Disconnect.
• Connect the DC − cable to the "GROUNDED" screw terminal of the DC Disconnect
(torque: 15 in-lb. (1.7 Nm)).
3. To connect the DC cables of the Combiner Box with positive polarity, connect the DC cables:
• Connect the DC − cable to the "COMBINED" spring terminal of the DC Disconnect.
• Connect the DC+ cable to the "GROUNDED" screw terminal of the DC Disconnect
(torque: 15 in-lb. (1.7 Nm)).
4. Ensure that all terminals are correctly connected and that the cables are securely positioned in
the terminals.
5. Close the DC Disconnect (see Section 9.4).
6. Commission the inverter (see Section 8).
50 SB30-40-US-IA-en-33
SMA America, LLC
Installation Manual