All-Pin Separation Cabling Variant, E.g. Uk - Fronius Primo GEN24 3.6 Operating Instructions Manual

The following points regarding cabling must be considered:
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All-pin separa- Circuit Diagram
tion cabling vari- The Circuit Diagram for 2-pin double separation, e.g. UK, can be found in the ap-
ant, e.g. UK pendix to this document on page 201.
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 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.
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The main contacts of contactors K1 and K2 must be installed between the
Fronius Smart Meter and the residual-current circuit breaker of the inverter
and the residual-current circuit breaker 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) downstream of the Fronius Smart
Meter and fused accordingly.
To ensure residual-current circuit breakers function in backup power mode,
the connection between the neutral conductor and the ground conductor
must be established as close as possible to the inverter, but in any case up-
stream of the first residual-current circuit breaker. An NC contact is used for
this purpose for each of the main contacts of contactors K4 and K5. This en-
sures that the ground connection is established as soon as the public grid
connection is no longer available.
As with contactor K1, the supply voltage for contactors K4 and K5 is
provided via phase 1 (L1) of the public grid.
An NC contact for relay K3 interrupts the supply voltage to contactors K1,
K2, K4 and K5. This prevents the ground connection from being immediately
disconnected again when power returns to the public grid and 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.
The use of contactor K2 is optional in France and Spain.
Additional inverters or other AC sources can be installed in the backup
power circuit downstream of the main contacts of K1 and K2. The sources
are not synchronised to the network of the inverter because this backup
power network has a frequency of 53 Hz.