Operation principle and hardware description 29
Symbol Terminal/Component Description/Operation
1 DC input terminals The solar generator is connected to the inverter DC input terminals
with busbars or through miniature circuit breakers (option +H377).
2 AC output The AC output terminals connect the inverter to the low-voltage AC
power system.
3 Auxiliary control
voltage input
The customer supplies 230 V AC 1-phase auxiliary control voltage to
the inverter circuit boards, cooling fan(s) and contactor control
circuits.
4 Transformer The transformer connects the inverter AC side to the low-voltage or
medium voltage distribution network.
5 Junction box power
supply (option +G410)
The inverter supplies power to the junction box through terminal
X21. Max 6 A. Fault current protected.
A20 Grounding board (with
options +F282 and
+F283)
Provides fuse protection and current monitoring. See section
Positive or negative pole grounding (options +F282 and +F283) on
page 42.
A50 Varistors For overvoltage protection
C11
C21
EMC filter capacitor Reduces electromagnetic interference.
F2 Inverter DC fuses Protect the inverter module.
F50
F51
F52
Overvoltage protection
devices (F50 with
option +F263 only)
Devices for overvoltage protection against for example climatic
overvoltages caused by lightning strikes.
K1 AC contactor The inverter controls the AC contactor according to the operational
state.
K2 DC contactor The inverter controls the DC contactor according to the operational
state. The solar generator is disconnected from the inverter when
needed.
K19
R1
F19.1
F20.1
Charging circuit The inverter controls the charging contactor after receiving a start
command.
K20 Grounding contactor
(with options +F282
and +F283)
The inverter software controls the disconnection of the
positive/negative pole grounding. See section Positive or negative
pole grounding (options +F282 and +F283) on page 42.
Q1 AC main switch-
disconnector with fuses
Hand-operated switch which connects the inverter to the electrical
power system. The switch includes AC main fuses.
The AC main switch-disconnector can be operated at all times. If it
is operated during operation, the inverter will trip as the grid
disappears.
Q2 DC main switch Hand-operated switch which connects the inverter to the solar
generator. The switch is interlocked with the DC contactor so that it
will not open unless the DC contactor is open. If there is no auxiliary
power in the inverter, the switch cannot be operated at all. It will
remain in the position where it already is.
Q10 Auxiliary control
voltage switch
Hand-operated switch which connects the auxiliary control voltage to
the inverter.
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