Safety instructions 7
• Before you do work on the inverter, apply a temporary grounding for work (AC and DC
side).
• Do not do work on the control cables when power is applied to the inverter or to the
external control circuits. Externally supplied control circuits can cause dangerous
voltages in the inverter even when the main power on the inverter is off.
• Live parts in the inverter cabinet are protected against direct contact when all
protective plastic covers and metallic shrouds are in place.
• Do not do insulation or voltage withstand tests on the inverter or inverter modules.
• The installation must be done according to the local requirements (for example,
ANSI/NFPA 70, Canadian Electrical Code, and so on).
• Utility interconnection may require approval from the authority with local jurisdiction.
Note: With DC side functional grounding (negative as standard, positive
functional grounding optional), one of the poles of the photovoltaic generator is
grounded, and therefore, the other pole has full voltage against ground (up to
1500 V).
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.
• Only qualified electricians are allowed to perform grounding work.
• Always ground the inverter and adjoining equipment. Correct grounding also
decreases electromagnetic emissions and interference. Follow the site’s policy on
disconnecting the inverter from AC and DC.
• 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. 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, 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.
Notes:
• You can use power cable shields as grounding conductors only if their
conductivity is sufficient.
• 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.
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