from the grid by contactor K1. The rest of the home network is not supplied with
power in this case.
The following points regarding cabling must be considered
-
The main contacts of contactor K1 must be installed between the Fronius
Smart Meter and the inverter and the residual current circuit breaker of the
backup power circuits.
-
The supply for contactor K1 is provided by the public grid and must be con-
nected to phase 1 (L1) after the Fronius Smart Meter and fused accordingly.
-
An NC contact for relay K3 interrupts the supply voltage to contactor K1.
This prevents the backup power network of the inverter from being switched
to the public grid.
-
The NO contact of relay K3 gives feedback to the inverter on whether the
locking was successfully performed by relay K3.
-
Additional inverters or other AC sources can be installed in the backup
power circuit after the main contacts of K1. The sources are not synchron-
ised to the network of the inverter because this backup power network has a
frequency of 53 Hz.
Automatic
switch to backup
power 4-pin sep-
aration, e.g. Ger-
many, France,
Spain
Circuit Diagrams
-
Automatic switch to backup power 4-pin single separation - e.g. Germany on
page 189.
-
Automatic switch to backup power 4-pin single FRT-capable separation on
page 190.
-
Automatic switch to backup power 4-pin single separation - e.g. France on
page 191.
-
Automatic switch to backup power 4-pin single separation - e.g. Spain on
page 192.
Cabling of backup power circuit and non-backup power circuits
If not all the loads in the home need to be supplied in a backup power situation,
the circuits need to be divided into backup power circuits and non-backup power
circuits. The total load of the backup power circuits must not exceed the rated
power of the inverter.
The emergency power circuits and non-emergency power circuits must be fused
separately according to the required safety measures (residual current circuit
breaker, automatic circuit breaker, etc.).
In backup power mode, only the backup power circuits are all-pin disconnected
from the grid by contactor K1; a ground connection is only established for these
circuits. The rest of the home network is not supplied with power in this case.
89
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