SMA SUNNY BOY 3.0-US Instructions D'installation page 49

SMA Solar Technology AG
Procedure:
1.
Danger to life due to high voltages
When exposed to sunlight, the PV array generates dangerous DC voltage which is present
in the DC conductors. Touching the DC conductors can lead to lethal electric shocks.
• If an external DC disconnecting switch is available, open the external DC
disconnecting switch.
• Ensure that the DC load-break switch on the inverter is in the O position.
• Ensure that there is no voltage on the DC inputs of the inverter.
2. Remove the adhesive tape from the enclosure opening for the DC connection and, if other
enclosure openings are to be used, take the sealing plugs out of these enclosure openings.
3. Insert the conduit fitting into the opening and tighten from the inside using the counter nut.
4. Attach the conduit to the conduit fitting.
5. Guide the conductors from the conduit into the inverter. In the process, lay the conductors in
the inverter such that they do not come into contact with the communication assembly.
6. Connect each equipment grounding conductor of the PV array to an equipment grounding
terminal:
• Strip the insulation of the equipment grounding conductor by 18 mm (0.71 in).
• Insert the screw through the spring washer, the clamping bracket and the washer.
• Guide the equipment grounding conductor
between the washer and clamping bracket and
tighten the screw (TX 25) (torque: 6 Nm ±
0.3 Nm (53.10 in-lb ± 2.65 in-lb)). Here, the
equipment grounding conductor must have
contact with an inner edge of the clamping
bracket.
• If two equipment grounding conductors are to
be connected to one equipment grounding
terminal, guide both equipment grounding
conductors between the washer and clamping
bracket and tighten the screw (TX 25, torque:
6 Nm ± 0.3 Nm (53.10 in-lb ± 2.65 in-lb)).
Here, every equipment grounding conductor
must have contact with an inner edge of the
clamping bracket.
7. Plug the terminal block for the DC connection into the DC-in slot in the inverter.
Installation Manual
DANGER
SBxx-1SP-US-41-IA-xx-12
6 Electrical Connection
49