14 Safety instructions
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. If you ignore them, injury or death, or
damage to the equipment can occur.
• If you are not a qualified electrician, do not do electrical installation or
maintenance work.
• Never work on the photovoltaic generator or the inverter or its input or output cables
when the inverter is connected to electrical power system or to the photovoltaic
generator. After disconnecting the inverter from the electrical power system and the
DC input, always wait for 5 min to let the intermediate circuit capacitors discharge
before you start working on the inverter, its input and output cables or the photovoltaic
generator.
Always ensure by measuring with a multimeter (impedance at least 1 Mohm) that:
1) Voltage between inverter phases (L1, L2, L3) and the frame is close to 0 V.
2) Voltage between the inverter module terminals (UDC+ and UDC-) and inverter DC
input terminals (L+ and L-) and the frame is close to 0 V.
• Before working inside 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 grid disconnecting device (disconnecting means) of
the inverter does not isolate the AC output cables and terminals from the electrical
power system. The DC main switch/switches or DC input circuit breakers do not
isolate the DC input cables or terminals from the DC voltage supplied by the
photovoltaic generator.
• Before working inside the inverter cabinet, switch off or isolate the auxiliary voltage
supply from the inverter.
• Before working on the unit, apply temporary grounding for work. See page 12.
• Do not work on the control cables when power is applied to the inverter or to the
external control circuits. Externally supplied control circuits may cause dangerous
voltages inside the inverter even when the main power on the inverter is switched off.
• Live parts inside the cubicle are protected against direct contact when all protective
plastic covers and metallic shrouds are in place. Pay special attention when handling
sharp metallic shrouds.
• Do not make any insulation or voltage withstand tests on the inverter or inverter
modules.
Note:
• The DC connection terminals (UDC+, UDC-, L+ and L-) carry a dangerous DC voltage
(up to 1100 V).
• External wiring can supply dangerous voltages to the terminals of relay outputs (RO1,
RO2 and RO3).
• Depending on the external and internal wiring, dangerous voltages (115 V or 230 V)
may be present at different terminals in the auxiliary connection unit.
• With options +F282 and +F283, one of the poles of the photovoltaic generator is
grounded, and therefore, the other pole has full voltage against ground (up to 1100 V).
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