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 voltage for contactor K1 is provided by the public grid and must
be connected to phase 1 (L1) after the Fronius Smart Meter and fused ac-
cordingly.
-
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 2-pin sep-
aration, e.g. Ger-
many, France,
UK, Spain
Circuit diagrams on page. on page. on page. on page .
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 contact-
or K1; a ground connection is only established for these circuits. 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 residual-current circuit breaker of the inverter or the
residual-current circuit breaker of the emergency power circuits.
-
The supply voltage for contactor K1 is provided by the public grid and must
be connected to phase 1 (L1) after the Fronius Smart Meter and fused ac-
cordingly.
-
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,
K4 and K5. This prevents the ground connection from being immediately dis-
connected 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.
-
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.
-
A Fronius Smart Meter with current transformer is required for the UK (e.g.
Fronius Smart Meter 50kA-3 or Fronius Smart Meter TS 5kA-3).
91
To Next Page
Loading...
Need help?
General
