You must use adequately dimensioned cable cross-sections in order to avoid a considerable increase in the grid impedan- ce between the domestic distribution and the solar inverter. The terminal range of the AC terminals is 0.5 to 6 mm2 for rigid cables and 0.5 to 10 mm2 for flexible cables. With a high grid impedance, i.e. with a long line or too small a cross- section, the voltage increases at the grid terminal during feed-in.
If the terminal voltage exceeds the per- missible value, the solar inverter is discon- nected from the grid.
Carefully perform the following steps:
·Check that there is no voltage before introducing the supply main into the unit.
·Lead the 5-core AC cable (outer diame- ter 9 – 17 mm) through the M25 threa- ded cable gland.
·Connect cables L1, L2, L3, PE and N to the relevant circuit board terminal with the help of a slot-head screwdriver (see figure below).
·Tighten the M25 screw connection, so that the cable cannot exert any mechanical force on the circuit board terminal.
