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6 Electrical Connection SMA Solar Technology AG <br />Installation ManualSBxx-1SP-US-41-IA-xx-12 50 <br />8.DANGER <br />Danger to life due to electric arc <br />The terminal block must be fastened to the slot with two screws. If the terminal block is not <br />correctly mounted and comes out of the slot, an electric arc can form. An electric arc can <br />cause life-threatening burns and can cause fire. <br />• Mount the terminal block using the two screws as described in the following. <br />9. Tighten the screws of the terminal block using a flat- <br />blade screwdriver (blade width: 3.5 mm (0.14 in)) <br />(torque: 0.3 Nm (2.65 in-lb)). <br />COM <br />DC -in <br />A+ B+ C+ A− B C− −A+ B+ C+ A− B− C − <br />1 <br />2 <br />10. Ensure that the terminal block is securely in place and the screws are tightened. <br />11. Strip off the conductor insulation by 18 mm (0.71 in). <br />12. In the case of fine stranded wire, provide each conductor with a bootlace ferrule. <br />13. Connection of conductors of finely stranded wire <br />To connect conductors made of finely stranded wire, each terminal point must be opened. <br />• First insert the connector into the terminal point all the way to the lock (round <br />opening). Then insert a flat-blade screwdriver (blade: 3.5 mm (0.14 in)) as far as it <br />can go into the actuation shaft (rectangular opening). Hereby the lock opens and <br />the conductor can be placed into the terminal point as far as possible. After the <br />connection has been made, the flat-blade screwdriver must be pulled out of the <br />actuation shaft. <br />14. WARNING <br />Fire hazard due to faulty conductor connection <br />If the conductors are inserted into the actuation shafts (right-angled openings), a fire may <br />occur during inverter commissioning. <br />• Connect the conductors to the terminal block as described in the following. <br />15. Connect the conductors to the terminal block in <br />accordance with the labeling. Insert each conductor <br />into the corresponding terminal point (round <br />opening) up to the stop. Always connect the positive <br />terminal and the negative terminal of a string to the <br />same input, and keep in mind that the terminals C+ <br />and C- of inverters with two DC inputs must not be <br />assigned. <br />DC -in <br />1 <br />A+ B+ C+ A− B− C− <br />EN <br />G <br />L <br />I <br />S <br />H <br />534 S Sycamore St <br />- 10110979707/01/22