Fronius Primo GEN24 4.0 Operating Instructions Manual page 93

the inverter.The backup power circuits and non-backup power circuits must be
fused separately according to the required safety measures (residual current cir-
cuit breaker, automatic circuit breaker, etc.).In backup power mode, only the
backup power circuits and inverter are disconnected from the grid by the
changeover switch Q1. In the case of two-pin separation, an additional earth con-
nection is established. In this case, the loads in the non-backup circuit are not
supplied by the inverter.
The following points regarding installation must be considered
- The changeover switch Q1 must be dimensioned for the fuses installed up-
stream, the max. occurring amperage and the max. occurring short circuit
current. An auxiliary switching element with two NO contacts is required for
switch position 1 (grid operation) to match the installed Q1 changeover
switch.The Q1 switch used must fulfil a short-circuit breaking capacity of at
least 10kA according to the standard IEC 60947-1. If the short circuit cur-
rent at the installation point reaches a value above 10kA, a switch with an ap-
propriate short-circuit breaking capacity must be used.
- The circuit is to be used exclusively in household applications and installa-
tions (small trade and agriculture) or up to upstream fuses with a nominal
current of 63A.
- Min. impulse withstand voltage of the changeover switch of 4kV according to
IEC 60947-1.
- Whether 1-pin or 2-pin separation is to be used must be clarified with the
grid operator.
- The protective measure must be tested regularly; if this is not regulated by
law, it must be performed annually.
- Data transfer between the Fronius Smart Meter and the inverter may be in-
terrupted in backup power mode (switch position 2). This is optionally en-
sured via a contact of the changeover switch. Interrupting the Smart Meter
connection is optional and prevents the backup power function from ending
when the public grid returns. If this does not take place, the inverter inter-
rupts the backup power supply when the public grid returns. Failure to
manually switch to grid-parallel operation within the first 10 minutes of the
public grid returning may cause the inverter and battery to shut down. In this
case, a manual system start must be carried out. (See chapter on page ). This
behaviour must be taken into account especially during a test of the manual
switchover, because the inverter does not start backup power mode due to
the existing Smart Meter data when the grid connection is established.
- The data communication connection with the Fronius Smart Meter must be
established separately from the battery to its dedicated Modbus input so
that battery data communication is maintained. (See chapter on page ).
- Feedback to the digital inputs (IOs) of the inverter via the changeover switch
Q1 (switch position 2), is a start condition for the inverter's backup power
mode.
- The AC output of the inverter is de-energised when switching over via switch
position 0. This is ensured by interrupting the WSD line with 2 contacts of
the changeover switch Q1 in position 0.
- The continuous connection between the equipotential bonding rail and the
neutral conductor from the inverter must not be interrupted in the case of 1-
pin separation.
-
In the case of 2-pin separation, the PE-N conductor connection is estab-
lished via the main contacts of the changeover switch Q1 in a double version.
- Additional inverters or other AC sources can be installed in the backup
power circuit after the changeover switch Q1. The sources will not synchron-
ise to the inverter's backup power network in case of backup power because
this is operated at 53 Hz.
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