Safety instructions 11
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. This is necessary for personnel
safety. Correct grounding decreases electromagnetic emissions and interference.
• Make sure that the conductivity of the grounding conductors is sufficient. Obey the
local regulations.
• In a multiple-inverter installation, connect each inverter separately to the protective
earth (PE) busbar of the switch board or the transformer.
• 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 is 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.
Electric welding
WARNING! Do not fasten the cabinet by electric welding and do not perform any
welding work for the inverter housing when inverters are installed. 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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