SMA SUNNY BOY 4000-US - Page 51

SMA America, LLC Electrical connection
Installation Guide SB30-40US-IUS103030 51
Negative grounding
1. Verify that your inverter is grounded as intended. Refer to section 6.7.2”DC input grounding”
(page48).
4. Torque all wires in the terminal blocks inside the SMA DC Disconnect to 15 in-lb (1.7 Nm).
2. Connect the positive DC wires to the terminal labeled PV
UNGROUNDED in the SMA DC Disconnect.
3. Connect the negative DC wires to the terminal labeled PV
GROUNDED in the SMA DC Disconnect.
5. Use a screwdriver in order to poke a hole in the groove
of the grommet.
6. Remove the membrane.
Positive DC wires
Negative DC wires