Safety instructions 15
• When the photovoltaic generator cells are exposed to light (even if it is dim), the
generator supplies DC voltage to the inverter.
Grounding
These instructions are for all personnel who are responsible for the grounding of the
inverter.
WARNING! Obey these instructions. If you ignore them, injury or death, or
equipment malfunction can occur, and electromagnetic interference can increase.
• If you are not a qualified electrician, do not do grounding work.
• Always ground the inverter and adjoining equipment. This is necessary for the
personnel safety. Proper grounding also reduces electromagnetic emission and
interference.
• Make sure that the conductivity of the grounding conductors is sufficient. See section
Selecting the power cables on page 75. Obey the local regulations.
• In a multiple-inverter installation, connect each inverter separately to protective earth
(PE) busbar of the switch board or the transformer.
• When shielded AC power cables are used, make a 360° high frequency grounding of
cable entries at the cabinet lead-through to suppress electromagnetic disturbances. In
addition, connect the cable shields to protective earth (PE) to meet safety regulations.
• EMC filters are not allowed at the AC output of the inverter.
• Do not install the inverter on a TN (grounded) system.
• Do not install the EMC filter option (+E216) for the network side of the low voltage
transformer on an (ungrounded) system.
Note:
• You can use power cable shields as grounding conductors only when their conductivity
is sufficient.
• As the normal touch current of the inverter is higher than 3.5 mA AC or 10 mA DC, you
must use a fixed protective earth connection. See standard IEC/EN 62109, 5.2.5.
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