10 Safety instructions
Installation and maintenance safety
Electrical safety
These warnings are for all personnel who do work on the inverter, its input and output
cables, the transformer or photovoltaic generator.
WARNING! Obey these instructions to prevent injury or death, or damage to the
equipment.
• If you are not a qualified electrician, do not do electrical installation or
maintenance work.
• Standard IEC/EN 62109-2 (section 4.8.3.6) requires that, as the inverter is not
provided with full protection against shock hazard on the photovoltaic array, you install
and use the inverter in a closed electrical operating area. There is no RCD protection
inside the inverter.
• Do not do work on the photovoltaic generator or the inverter or its input or output
cables when the inverter is connected to an electrical power system or to the
photovoltaic generator.
• Before you do work in the inverter cabinet, isolate the AC line cables and busbars from
the electrical power system with the disconnector of the power system transformer.
Also, isolate the inverter from the photovoltaic generator with the safety switch of the
generator or by other means. The AC main switch or optional breaker do not isolate
the AC output cables and terminals of the inverter from the electrical power system.
The DC main switch does not isolate the DC input fuses, cables or terminals from the
DC voltage supplied by the photovoltaic generator.
• Before you do work in the inverter cabinet, set to off or isolate the auxiliary voltage
supply from the inverter.
• Do not operate the inverter with the doors open, even in fault tracking conditions. The
inverter doors act as arc hazard protection. If a highly unlikely arc flash incident
happens when the inverter doors are open, even the arc-flash proof protection
equipment might not provide sufficient protection.
• Before you do work on the inverter, apply a temporary grounding for work.
• Do not 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.
• Obey all local installation safety standards. This can require the use of arc-proof
clothing, arc-proof masks, protective footwear, protective gloves, eye protection and
hearing protection. High power inverter installations have high fault currents. Select
appropriate arc-proof clothing according to local regulations.
• With the grounding options selected, one of the poles of the photovoltaic generator is
grounded, and therefore, the other pole has full voltage against ground (up to 1000 V).
• When the photovoltaic generator cells are exposed to light (even if it is dim), the
generator supplies DC voltage to the inverter.
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