Safety instructions 11
• 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 to prevent injury or death, damage to the
equipment and electromagnetic interference.
• If you are not a qualified electrician, do not do grounding work.
• Always ground the inverter and adjoining equipment with proper PPE on. This is
necessary for personnel safety. Correct grounding decreases electromagnetic
emissions and interference. Follow the site’s policy on disconnecting the inverter from
AC.
• The minimum cross section of the grounding conductor must be at least half of the
cross section of the line conductor or fulfill the local regulations. The grounding
conductor must withstand 50 kA RMS prospective for time duration of 1 second. Refer
to standard IEC 60364-5-54.
• In a multiple-inverter installation, connect each inverter separately to the protective
earth (PE) busbar of the switch board or the transformer.
• Avoid grounding loops and keep grounding cables at least 0.5 m away from the AC
cables, as current can be generated to a grounding loop by the electromagnetic
coupling from the supply cables.
• When you use shielded AC power cables, do a 360° high-frequency grounding of the
cable entries at the cabinet lead-through to decrease electromagnetic interference.
Connect the cable shields to the protective earth (PE) to meet safety regulations.
• External EMC filters are not permitted at the AC output of the inverter.
• Do not install the inverter on a TN (grounded) system.
Note:
• You can use power cable shields as grounding conductors only if their conductivity is
sufficient.
• As the normal touch current of the inverter can be more than 3.5 mA AC or 10 mA DC,
use a fixed protective earth connection. Refer to standard IEC/EN 62109, 5.2.5. or
IEC62477-1, 4.4.4.3.3.
Electric welding
WARNING! Do not fasten the cabinet by electric welding. ABB does not assume
any liability for damages caused by electric welding as the welding circuit can
damage electronic circuits in the cabinet.
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