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
10 kA according to the standard IEC 60947-1. If the short circuit current at
the installation point reaches a value above 10 kA, a switch with an appropri-
ate 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 63 A.
-
Min. impulse withstand voltage of the changeover switch of 4 kV according to
IEC 60947-1.
-
Whether 3-pin or all-pin separation is to be used must be clarified with the
grid operator.
-
Testing the protective measure must take place regularly; if this is not regu-
lated 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 NO contact of the auxiliary contact. Interrupting the Smart Meter
connection via auxiliary contact Q1.1 is optional and prevents the backup
power function from ending when the public grid returns. If this does not
take place, the inverter interrupts 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 bat-
tery to shut down. In this case, a manual system start must be carried out.
(See chapter Manual system start on page 30). 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 Modbus parti-
cipants on page 93).
-
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 through interruption of the WSD line with the 2nd
NO contact of the auxiliary contact and 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 during the 3-pin
separation.
-
With all-pin separation, the PE-N conductor connection is established 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.
Testing backup
power mode
After the initial installation and configuration of the backup power operation, it is
recommended to test the backup power operation. For test mode, a battery
charge of min. 30 % is recommended.
A description on how to run test mode can be found in the backup power check-
list (https://www.fronius.com/en/search-page, item number: 42,0426,0365).
92
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