The following points regarding cabling must be considered:
-
The main contacts of contactors K1 and K2 must be installed between the
Fronius Smart Meter and the inverter and the residual-current circuit break-
er of the backup power circuits.
-
The supply voltage for contactors K1 and K2 is provided by the public grid
and must be connected to phase 1 (L1) after the Fronius Smart Meter and
fused accordingly.
-
An NC contact for the relay K3 interrupts the supply voltage to contactors
K1 and K2. This prevents the backup power network of the inverter from be-
ing 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 and K2. The sources are not syn-
chronised to the network of the inverter because this backup power network
has a frequency of 53 Hz.
-
The use of contactor K2 is optional in Australia.
Al-pin separa-
tion cabling vari-
ant e.g. Ger-
many, France,
Spain
Circuit Diagram
The Circuit Diagram for the 4-pin double separation - e.g. Germany, can be found
in the appendix of this document on page 182
The Circuit Diagram for the 4-pin single separation - e.g. France and Spain, can
be found in the appendix of this document on page 183.
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 nominal
output of the inverter.
The backup power circuits and non-backup power circuits must be fused separ-
ately according to the required safety measures (residual-current circuit breaker,
automatic circuit breaker, etc.).
In backup power mode, only the backup power circuits are disconnected at all
pins from the grid by contactors K1 and K2; an earth connection is only estab-
lished for these circuits. The rest of the home network is not supplied with power
in this case.
85
EN
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