Fronius Fronius Symo Hybrid - Wiring examples emergency power switch Installation Instruction [EN]

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Fronius Symo Hybrid
Wiring examples emergency

power switchover

Installation instructions

EN

Grid-connected inverter

42,0426,0209,EN 015-22092020

Contents

General 4

General 4

Cabling variants including emergency power circuits and 3-pin separation e.g. Austria or Australia 5

Circuit diagram 5
Functions 5
Cabling for emergency power circuit and non-emergency power circuits 5
Transition from feeding energy into the grid to emergency power mode 6

Transition from emergency power mode to feeding energy into the grid 6
Cabling variants including emergency power circuits with grid and system protection and 3-pin separ­ation e.g. Austria

Circuit diagram 7

Functions 7

Cabling for emergency power circuits and non-emergency power circuits 7

Transition from feeding energy into the grid to emergency power mode 8

Transition from emergency power mode to feeding energy into the grid 9
Cabling variants including emergency power circuits and 4-pin separation e.g. Germany 10

Circuit diagram 10

Functions 10

Cabling for emergency power circuits and non-emergency power circuits 10

Transition from feeding energy into the grid to emergency power mode 11

Transition from emergency power mode to feeding energy into the grid 12
Cabling variants including emergency power circuits with grid and system production and 4-pin separ­ation e.g. Germany

Circuit diagram 13

Functions 13

Cabling for emergency power circuits and non-emergency power circuits 13

Transition from feeding energy into the grid to emergency power mode 14

Transition from emergency power mode to feeding energy into the grid 15
Cabling variants including emergency power circuits with grid and system protection and 4-pin separ­ation, e.g. Italy

Circuit diagram 16

Functions 16

Cabling for emergency power circuits and non-emergency power circuits 16

Transitioning from feeding energy into the grid to backup power mode 18

Transition from emergency power mode to feeding energy into the grid 18
Description of components 19

Description of components for full version 19
Emergency power configuration 21

Requirements 21

Emergency power configuration - overview 21

Accessing the CONFIG menu 21

Selecting alternative (emergency power) setup 22

Configuring the digital I/Os on the Fronius Datamanager 22

Configuring the system overview on the Fronius Datamanager 23

Configuring the energy management on the Fronius Datamanager (option) 23

EN

7

13

16

Appendix 25

3-pin separation Austria with Solar Battery 26
3-pin separation Australia with Solar Battery 27
3-pin separation Austria with BYD 28
3-pin separation Australia with BYD 29
3-pin separation with grid and system protection Austria with Solar Battery 30
4-pin separation Germany with Solar Battery 31
4-pin separation Germany with BYD 32
4-pin separation with grid and system protection Germany with Solar Battery 33
4-pin seperation with grid and system protection Italy with Solar Battery 34
Fronius Symo Hybrid and BYD Battery-Box Premium HV 35

3

General

General The examples given in this document (in particular cabling variants and Circuit Dia-

grams) are suggestions only. These examples have been carefully developed and
tested. They can therefore be used as a basis for real-life installation. Anyone following
or using these examples does so at their own risk.

IMPORTANT!

The applicable national laws, standards and regulations as well as the specifications of
the respective grid operator must be taken into account and applied.
It is strongly recommended to coordinate the concrete examples implemented and in
particular the specific installation with the grid operator to obtain their explicit approval.
This obligation applies to system constructors in particular (e.g. installers).
The examples suggested here show a backup power supply with or without an external
protection relay (external grid and system protection unit). Whether an external protec­tion relay must be used or not is the decision of the respective grid operator.

IMPORTANT!

No uninterruptible power supply (UPS) must be operated in the backup power circuit.
The Installation and Operating Instructions must be read carefully prior to use. If anything
is unclear, contact your vendor immediately.

WARNING!

Any incorrect installation, commissioning, operation or usage can cause serious
personal injury and/or property damage.

Only trained and qualified personnel are authorised to install and commission the sys­tem, and only within the scope of the technical regulations.

4

Cabling variants including emergency power cir­cuits and 3-pin separation e.g. Austria or Australia

Circuit diagram The circuit diagram for the cabling variant „3-pin separation Austria with Solar Bat-

tery“ can be found in the appendix to this document on page 26.

The circuit diagram for the cabling variant „3-pin separation Australia with Solar Bat-

tery“ can be found in the appendix to this document on page 27.

The circuit diagram Fronius Symo Hybrid and BYD Battery-Box Premium HV can be
found in the appendix to this document on page 35.

The circuit diagram for the cabling variant „3-pin separation Austria with BYD“ can be
found in the appendix to this document on page 28 .

The circuit diagram for the cabling variant „3-pin separation Australia with BYD“ can
be found in the appendix to this document on page 29.

Functions - Measuring and transferring the required parameters for energy management and

Solar.web by the Fronius Smart Meter

- Disconnecting from the public grid to enable operation in emergency power mode if
the grid parameters are outside the country-specific standards.

- Reconnecting to the public grid when the grid parameters are within the limits spe­cified by the country-specific standards.

- Option of having a separate emergency power circuit or several emergency power
circuits that are supplied even during failure of the public grid. The total load of the
emergency power circuits must not exceed the nominal output of the inverter. Fur­thermore, the performance of the attached battery must also be considered. The
other circuits are not supplied in the event of a power failure.

EN

Cabling for emer­gency power cir­cuit and non­emergency power
circuits

The use of contactor K2 is optional in Australia.

If not all the consumers in the home need to be supplied in an emergency power situ­ation, the circuits need to be divided into emergency power circuits and non-emergency
power circuits.
The total load of the emergency power circuits must not exceed the nominal output 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 emergency power mode, only the emergency power circuits are disconnected from the
grid by contactors K1 and K2 3-pin (L1, L2 and L3). The rest of the home network is not
supplied with power in this case

5

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 residual-current circuit breaker of the inverter or the residual­current circuit breaker of the emergency 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 relay K3 interrupts the supply voltage to contactors K1 and K2.
This prevents the emergency 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 emergency power
circuit after the main contacts of K1 and K2. The sources are not synchronised to
the network of the Fronius Symo Hybrid because this emergency power network has
a frequency of 53 Hz.

Transition from
feeding energy
into the grid to
emergency power
mode

Transition from
emergency power
mode to feeding
energy into the
grid

1. The public grid is monitored by the inverter's internal grid and system protection unit
and by the Fronius Smart Meter connected to it.

2. Failure of the public grid

3. The inverter carries out the necessary measures according to the country standard
and then switches off.
Contactors K1 and K2 drop out. This disconnects the emergency power circuits and
the inverter from the rest of the home network and from the public grid, as the main
contacts of the contactors K1 and K2 3-pin open.The NC auxiliary contacts of con­tactors K1 and K2 send feedback to the inverter that the contactors are open (a con­dition for starting the emergency power mode).

4. The inverter activates relay K3, which interrupts the supply to contactors K1 and K2.
This prevents unintentional activation of contactors K1 and K2 and thus a grid con­nection when voltage is restored in the grid.

5. The NO contact of relay K3 gives optional feedback to the inverter on whether the
locking was successfully performed by relay K3.

6. Based on the feedback from the contactors and the measurements at the inverter
terminals and at the Smart Meter, the inverter decides that emergency power mode
can be started.

7. The inverter starts emergency power mode after a defined checking period

8. All loads in the emergency power circuits are supplied with power. The remaining
loads are not supplied with power and are safely isolated.

1. The inverter is operating in emergency power mode. The contactors K1 and K2 to
the public grid are open.

2. Public grid available again

3. The Fronius Smart Meter monitors the grid parameters on the public grid and
passes this information to the inverter.

4. After a defined measuring period, the restored public grid is deemed to be stable.

5. The inverter ends emergency power mode and disconnects the outputs.

6. The inverter deactivates K3. The contactors K1 and K2 are reactivated.

7. All circuits are reconnected to the public grid and are supplied by the grid. The
inverter, therefore, does not feed anything into the grid.

8. The inverter can start feeding energy into the grid again after performing the grid
checks required by the country standard.

6

Cabling variants including emergency power cir­cuits with grid and system protection and 3-pin
separation e.g. Austria

Circuit diagram The circuit diagram "3-pin separation with grid and system protection Austria with

Solar Battery" can be found in the appendix to this document on page 30.

Functions - Measuring and transferring the required parameters for energy management and

Solar.web by the Fronius Smart Meter.

- Monitoring of the voltage and frequency grid parameters by the grid and system pro­tection unit.

- Disconnecting from the public grid to enable operation in emergency power mode if
the grid parameters are outside the country-specific standards.

- Reconnecting to the public grid when the grid parameters are within the limits spe­cified by the country-specific standards.

- Option of having a separate emergency power circuit or several emergency power
circuits that are supplied even during failure of the public grid. The total load of the
emergency power circuits must not exceed the nominal output of the inverter. Fur­thermore, the performance of the attached battery must also be considered. The
other circuits are not supplied in the event of a power failure.

EN

Cabling for emer­gency power cir­cuits and non­emergency power
circuits

If not all the consumers in the home need to be supplied in an emergency power situ­ation, the circuits need to be divided into emergency power circuits and non-emergency
power circuits.
The total load of the emergency power circuits must not exceed the nominal output 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 emergency power mode, only the emergency power circuits are disconnected from the
grid by contactors K1 and K2 3-pin (L1, L2 and L3). The rest of the home network is not
supplied with power in this case.

7

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 residual-current circuit breaker of the inverter or the residual­current circuit breaker of the emergency 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.

- Actuation of contactors K1 and K2 is carried out by the external grid and system pro­tection unit.

- The external grid and system protection unit must be installed after the Fronius
Smart Meter. Precise installation and cabling notes for the external grid and system
protection unit can be found in its separate Operating Instructions.

- The remote trip input of the external grid and system protection unit must be set to
NC according to the manufacturer's Operating Instructions.

- An NC contact for relay K3, which activates the remote input of the external grid and
system protection unit, interrupts the supply voltage to contactors K1 and K2. This
prevents the emergency 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 emergency power
circuit after the main contacts of K1 and K2. The sources are not synchronised to
the network of the Fronius Symo Hybrid because this emergency power network has
a frequency of 53 Hz.

Transition from
feeding energy
into the grid to
emergency power
mode

1. The public grid is monitored by the inverter's internal grid and system protection unit
and by an external grid and system protection unit.

2. Failure of the public grid

3. The inverter carries out the measures necessary according to the country standard
and then switches off.

4. The external grid and system protection unit opens contactors K1 and K2 for grid
monitoring. This disconnects the emergency power circuits and the inverter from the
rest of the home network and from the public grid, as the main contacts of the con­tactors K1 and K2 3-pin open. To ensure that the public grid has definitely been dis­connected, the NC auxiliary contacts of contactors K1 and K2 give feedback to the
external grid and system protection unit.

5. The NC main contact of contactor K4 gives feedback to the inverter that the grid was
disconnected by the external ENS.

6. The inverter activates relay K3, which activates the remote input of the external grid
and system protection unit via an NC contact. This prevents a connection to the pub­lic grid when power returns.

7. The NO contact of relay K3 gives optional feedback to the inverter on whether the
locking was successfully performed by relay K3.

8. The inverter decides based on the contactor's feedback as well as the measurement
on the inverter terminals and the Smart Meter that the emergency power mode can
be activated.

9. The inverter starts emergency power mode after a defined checking period.

10. All loads in the emergency power circuits are supplied with power. The remaining
loads are not supplied with power and are safely isolated.

8

Transition from
emergency power
mode to feeding
energy into the
grid

1. The inverter is operating in emergency power mode. The contactors K1 and K2 to
the public grid are open.

2. Public grid available again

3. The Fronius Smart Meter monitors the grid parameters on the public grid and
passes this information to the inverter.

4. After a defined measuring period, the restored public grid is deemed to be stable.

5. On the basis of adjustments that have been carried out, the inverter ends emer­gency power mode and disconnects the outputs.

6. The inverter deactivates K3. The external grid and system protection unit switches
the contactors K1 and K2 after performing the grid checks required by the applicable
standards.

7. All circuits are reconnected to the public grid and are supplied by the grid.

8. The inverter can start feeding energy into the grid again after performing the grid
checks required by the country standard.

EN

9

Cabling variants including emergency power cir­cuits and 4-pin separation e.g. Germany

Circuit diagram The circuit diagram for the cabling variant "4-pin separation Germany with Solar Bat-

tery" can be found in the appendix to this document on page 31.

The circuit diagram Fronius Symo Hybrid and BYD Battery-Box Premium HV can be
found in the appendix to this document on page 35.

The circuit diagram for the cabling variant "4-pin separation Germany with BYD" can
be found in the appendix to this document on page 32.

Functions - Measuring and transferring the required parameters for energy management and

Solar.web by the Fronius Smart Meter.

- Disconnecting from the public grid to enable operation in emergency power mode if
the grid parameters are outside the country-specific standards.

- Reconnecting to the public grid when the grid parameters are within the limits spe­cified by the country-specific standards.

- Establishing a proper ground connection for emergency power mode to ensure the
protection devices function correctly.

- Option of having a separate emergency power circuit or several emergency power
circuits that are supplied even during failure of the public grid. The total load of the
emergency power circuits must not exceed the nominal output of the inverter. Fur­thermore, the performance of the attached battery must also be considered. The
other circuits are not supplied in the event of a power failure.

Cabling for emer­gency power cir­cuits and non­emergency power
circuits

If not all the consumers in the home need to be supplied in an emergency power situ­ation, the circuits need to be divided into emergency power circuits and non-emergency
power circuits.
The total load of the emergency power circuits must not exceed the nominal output 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 emergency power mode, only the emergency power circuits are disconnected at all
pins from the grid by contactors K1 and K2; a ground connection is only established for
these circuits. The rest of the home network is not supplied with power in this case.

10

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 residual-current circuit breaker of the inverter or the residual­current circuit breaker of the emergency 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.

- To ensure residual-current circuit breakers function in emergency 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 before the first residual­current circuit breaker. An NC contact is used for this purpose for each of the main
contacts of contactors K4 and K5. This ensures 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 the 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 emergency 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 emergency power
circuit after the main contacts of K1 and K2. The sources are not synchronised to
the network of the Fronius Symo Hybrid because this emergency power network has
a frequency of 53 Hz.

EN

Transition from
feeding energy
into the grid to
emergency power
mode

1. The public grid is monitored by the inverter's internal grid and system protection unit
and by the Fronius Smart Meter connected to it.

2. Failure of the public grid

3. The inverter carries out the necessary measures according to the country standard
and then switches off.
Contactors K1 and K2, as well as K4 and K5, drop out. This disconnects the emer­gency power circuits and the inverter from the rest of the home network and from the
public grid, as the main contacts of the contactors K1 and K2 open at all pins. The
NC auxiliary contacts of contactors K1 and K2 send feedback to the inverter that the
contactors are open (a condition for starting the emergency power mode).

4. The NC main contacts of contactors K4 and K5 are closed, establishing a connec­tion between the neutral conductor and the ground conductor. The two other NC
main contacts of contactors K4 and K5 give feedback to the inverter that the ground
connection has been established correctly (a condition for starting the emergency
power mode).

5. The inverter activates relay K3, which interrupts the supply to contactors K1, K2, K4
and K5. This prevents unintentional activation of contactors K1, K2, K4 and K5 and
thus a grid connection when voltage is restored in the grid.

6. The NO contact of relay K3 gives additional feedback to the inverter on whether the
locking was successfully performed by relay K3.

7. The inverter decides based on the contactors' feedback as well as the measure­ments on the inverter terminals and the Smart Meter that the emergency power
mode can be activated.

8. The inverter starts emergency power mode after a defined checking period

9. All loads in the emergency power circuits are supplied with power. The remaining
loads are not supplied with power and are safely isolated.

11

Transition from
emergency power
mode to feeding
energy into the
grid

1. The inverter is operating in emergency power mode. The contactors K1 and K2 to
the public grid are open.

2. Public grid available again

3. The Fronius Smart Meter monitors the grid parameters on the public grid and
passes this information to the inverter.

4. After a defined measuring period, the restored public grid is deemed to be stable.

5. The inverter ends emergency power mode and disconnects the outputs.

6. The inverter deactivates K3. The contactors K1, K2, K4 and K5 are reactivated.

7. All circuits are reconnected to the public grid and are supplied by the grid. The
inverter, therefore, does not feed anything into the grid.

8. The inverter can start feeding energy into the grid again after performing the grid
checks required by the country standard.

12

Cabling variants including emergency power cir­cuits with grid and system production and 4-pin
separation e.g. Germany

Circuit diagram The circuit diagram "4-pin separation with grid and system protection Germany

with Solar Battery" can be found in the appendix to this document on page 33.

Functions - Measuring and transferring the required parameters for energy management and

Solar.web by the Fronius Smart Meter.

- Monitoring of the voltage and frequency grid parameters by the grid and system pro­tection unit.

- Disconnecting from the public grid to enable operation in emergency power mode if
the grid parameters are outside the country-specific standards.

- Reconnecting to the public grid when the grid parameters are within the limits spe­cified by the country-specific standards.

- Establishing a proper ground connection for emergency power mode to ensure the
protection devices function correctly.

- Option of having a separate emergency power circuit or several emergency power
circuits that are supplied even during failure of the public grid. The total load of the
emergency power circuits must not exceed the nominal output of the inverter. Fur­thermore, the performance of the attached battery must also be considered. The
other circuits are not supplied in the event of a power failure.

EN

Cabling for emer­gency power cir­cuits and non­emergency power
circuits

If not all the consumers in the home need to be supplied in an emergency power situ­ation, the circuits need to be divided into emergency power circuits and non-emergency
power circuits.
The total load of the emergency power circuits must not exceed the nominal output 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 emergency power mode, only the emergency power circuits are disconnected from the
grid by contactors K1 and K2; a ground connection is only established for these circuits.
The rest of the home network is not supplied with power in this case.

13

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 residual-current circuit breaker of the inverter or the residual­current circuit breaker of the emergency 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.

- Actuation of contactors K1 and K2 is carried out by the external grid and system pro­tection unit.

- The external grid and system protection unit must be installed after the Fronius
Smart Meter. Precise installation and cabling notes for the external grid and system
protection unit can be found in its separate Operating Instructions

- The remote trip input of the external grid and system protection unit must be set to
NC according to the manufacturer's Operating Instructions.

- To ensure residual-current circuit breakers function in emergency 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 before the first residual­current circuit breaker. An NC contact is used for this purpose for each of the main
contacts of contactors K4 and K5. This ensures 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 and is switched via the grid and system protection.

- An NC contact for relay K3, which activates the remote input of the external grid and
system protection unit, 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 emergency 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 emergency power
circuit after the main contacts of K1 and K2. The sources are not synchronised to
the network of the Fronius Symo Hybrid because this emergency power network has
a frequency of 53 Hz.

Transition from
feeding energy
into the grid to
emergency power
mode

1. The public grid is monitored by the inverter's internal grid and system protection unit
and by an external grid and system protection unit.

2. Failure of the public grid

3. The inverter carries out the measures necessary according to the country standard
and then switches off.

4. The external grid and system protection unit opens contactors K1 and K2 for grid
monitoring. This disconnects the emergency power circuits and the inverter from the
rest of the home network and from the public grid, as the main contacts of the con­tactors K1 and K2 open at all pins. To ensure that the public grid has definitely been
disconnected, the NC auxiliary contacts of contactors K1 and K2 give feedback to
the external grid and system protection unit.

5. The NC main contacts of contactors K4 and K5 are closed, establishing a connec­tion between the neutral conductor and the ground conductor. The two other NC
main contacts of contactors K4 and K5 give feedback to the inverter that the ground
connection has been established correctly (a condition for starting the emergency
power mode).

6. The inverter activates relay K3, which activates the remote input of the external ENS
via an NC contact. This prevents a connection to the public grid when power returns.

7. The NO contact of relay K3 gives optional feedback to the inverter on whether the
locking was successfully performed by relay K3.

8. The inverter decides based on the contactor's feedback as well as the measure­ments on the inverter terminals and the Smart Meter that the emergency power
mode can be activated.

9. The inverter starts emergency power mode after a defined checking period.

10. All loads in the emergency power circuits are supplied with power. The remaining
loads are not supplied with power and are safely isolated.

14

Transition from
emergency power
mode to feeding
energy into the
grid

1. The inverter is operating in emergency power mode. The contactors K1 and K2 to
the public grid are open.

2. Public grid available again

3. The Fronius Smart Meter monitors the grid parameters on the public grid and
passes this information to the inverter.

4. After a defined measuring period, the restored public grid is deemed to be stable.

5. On the basis of adjustments that have been carried out, the inverter ends emer­gency power mode and disconnects the outputs.

6. The inverter deactivates K3. The external grid and system protection unit switches
the contactors K1, K2, K4 and K5 after performing the grid checks required by the
applicable standards.

7. All circuits are reconnected to the public grid and are supplied by the grid.

8. The inverter can start feeding energy into the grid again after performing the grid
checks required by the country standard.

EN

15

Cabling variants including emergency power cir­cuits with grid and system protection and 4-pin
separation, e.g. Italy

Circuit diagram The circuit diagram "4-pin seperation with grid and system protection Italy with

Solar Battery" can be found in the appendix to this document on page 34.

Functions - Measuring and transferring the required parameters for energy management and

Solar.web by the Fronius Smart Meter.

- Monitoring of the voltage and frequency grid parameters by the grid and system pro­tection unit.

- Disconnecting from the public grid to enable operation in emergency power mode if
the grid parameters are outside the country-specific standards.

- Reconnecting to the public grid when the grid parameters are within the limits spe­cified by the country-specific standards.

- Establishing a proper ground connection for emergency power mode to ensure the
protection devices function correctly.

- Option of having a separate emergency power circuit or several emergency power
circuits that are supplied even during failure of the public grid. The total load of the
emergency power circuits must not exceed the nominal output of the inverter. Fur­thermore, the performance of the attached battery must also be considered. The
other circuits are not supplied in the event of a power failure.

Cabling for emer­gency power cir­cuits and non­emergency power
circuits

If not all the consumers in the home need to be supplied in an emergency power situ­ation, the circuits need to be divided into emergency power circuits and non-emergency
power circuits.
The total load of the emergency power circuits must not exceed the nominal output 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 emergency power mode, only the emergency power circuits are disconnected at all
pins from the grid by contactors K1 and K2; a ground connection is only established for
these circuits. The rest of the home network is not supplied with power in this case.

16

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 residual-current circuit breaker of the inverter or the residual­current circuit breaker of the emergency 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.

- Actuation of contactors K1 and K2 is carried out by the external grid and system pro­tection unit.

- The external grid and system protection unit must be installed after the Fronius
Smart Meter. Precise installation and cabling notes for the external grid and system
protection unit can be found in its separate Operating Instructions

- The remote trip input of the external grid and system protection unit must be set to
NC according to the manufacturer's Operating Instructions.

- To ensure residual-current circuit breakers function in emergency 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 before the first residual­current circuit breaker. An NC contact is used for this purpose for each of the main
contacts of contactors K4 and K5. This ensures 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 and is switched via the external grid and system pro­tection unit.

- An NC contact for relay K3, which activates the remote input of the external grid and
system protection unit, 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 emergency power network of
the inverter from being switched to the public grid.

- The NO contact of relay K3 gives additional 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 emergency power
circuit after the main contacts of K1 and K2. The sources are not synchronised to
the network of the Fronius Symo Hybrid because this emergency power network has
a frequency of 53 Hz.

EN

17

Transitioning
from feeding
energy into the
grid to backup
power mode

1. The public grid is monitored by the inverter's internal grid and system protection unit
and by an external grid and system protection unit.

2. Failure of the public grid

3. The inverter carries out the measures necessary according to the country standard
and then switches off.

4. The external grid and system protection unit opens contactors K1 and K2 for grid
monitoring. This disconnects the backup power circuits and the inverter from the rest
of the home network and from the public grid, as the main contacts of the contactors
K1 and K2 open at all pins. To ensure that the public grid has definitely been discon­nected, the NC auxiliary contacts of contactor K1 give feedback to the external grid
and system protection unit.

5. The NC main contact of contactors K4 and K5 is closed, establishing a connection
between the neutral conductor and the ground conductor. The two other NC main
contacts of contactors K4 and K5 give feedback to the inverter that the ground con­nection has been established correctly.

6. The inverter activates relay K3, which activates the remote input of the external grid
and system protection unit via an NC contact. This prevents a connection to the pub­lic grid when voltage is restored in the grid.

7. The NO contact of relay K3 gives additional feedback to the inverter on whether the
locking was successfully performed by relay K3.

8. The inverter decides based on the contactors' feedback as well as the measurement
on the inverter terminals and the Smart Meter that backup power mode can be star­ted.

9. The inverter starts backup power mode after a defined checking period.

10. All loads in the backup power circuits are supplied with power. The remaining loads
are not supplied with power and are safely isolated.

Transition from
emergency power
mode to feeding
energy into the
grid

1. The inverter is operating in emergency power mode. The contactors K1 and K2 to
the public grid are open.

2. Public grid available again

3. The Fronius Smart Meter monitors the grid parameters on the public grid and
passes this information to the inverter.

4. After a defined measuring period, the restored public grid is deemed to be stable.

5. On the basis of adjustments that have been carried out, the inverter ends emer­gency power mode and disconnects the outputs.

6. The inverter deactivates K3. The external grid and system protection unit switches
the contactors K1, K2, K4 and K5 after performing the grid checks required by the
applicable standards.

7. All circuits are reconnected to the public grid and are supplied by the grid.

8. The inverter can start feeding energy into the grid again after performing the grid
checks required by the country standard.

18

Description of components

EN

Description of
components for
full version

Fronius Smart Meter

- Type: Fronius Smart Meter 63 A

- Fronius item number: 43,0001,1473

- 230 (400) V - 240 (415) V

- 10 (63) A / 50 Hz - 60 Hz

- Modbus RTU communication

or

- Type: Fronius Smart Meter 50kA-3

- Fronius item number: 43,0001,1478

- 230 (400) V - 240 (415) V

- 10 (63) A / 50 Hz - 60 Hz

- Modbus RTU communication

Grid and system protection

Other types and manufacturers are permitted if they are technically and functionally
identical to the following type, e.g.:

- manufacturer: Bendner

- type: VMD460-NA-D-2

Fuse protection, grid and system protection or coupling relays

- 3-pin or 1-pin

- 6 A

K1 and K2 - installation contactor with auxiliary contact

- 3-pin or 4-pin (depending on cabling variant)

- 25 A or 63 A (depending on house connection)

- Coil voltage, 230 V AC

- Auxiliary contact

• 1 NO

• Switching voltage 12 - 230 V @ 50/60 Hz

• Short circuit current min. 1 kA

K3 - modular relay

- 2 changeover contacts

- Coil voltage: 12 V DC

K4 and K5 - installation contactor

- 2 NCs 20 A

- Coil voltage, 230 V AC (2P)

- 20 A

- Nominal frequency 50/60 Hz

- Short circuit current = min. 3 kA (Working contacts)

19

Further requirements

Contactors K1, K2, K4 and K5 must be certified to IEC 60947-4-1. Examples of contact­ors / relays that meet these requirements are

- K1 and K2:

• Iskra IK63-40 State 2018

• Schrack BZ326461 State 2018

- K4 and K5:

• Iskra IK20-02 State 2018

• Schrack BZ626439 STate 2018

- K3:

• Finder 22.23.9.012.4000

• Schrack Relay RT424012 (Bracket RT17017, Relay socket RT78725)

20

Emergency power configuration

GRAPH

Access Code

CODE

Requirements In order to use the hybrid inverter's emergency power function, the following prerequis-

ites must be fulfilled:

- Correct wiring of the emergency power system in the electrical installation (accord­ing to this document) - Check wiring

- Attach the emergency power sticker supplied with the inverter to the electrical dis­tributor.

- The meter (Fronius Smart Meter) must be installed at the feed-in point and con­figured

- Current system monitoring firmware on the inverter: V 1.3.2-3 or higher.
Update the firmware if necessary.

EN

Emergency
power configura­tion - overview

Accessing the
CONFIG menu

- Accessing the CONFIG menu

- Selecting alternative (emergency power) setup

- Configuring the digital I/Os on the Fronius Datamanager

- Configuring the system overview on the Fronius Datamanager

- Configuring the energy management on the Fronius Datamanager (option)

Press the "Menu" key

1

The menu level appears.

Press the unassigned "Menu / Esc"

2

key
5 times

'Access Code' is displayed in the
'CODE' menu; the first digit starts flash­ing.
The access code for the CONFIG menu
is: 39872

Enter the access code for the CON-

3

FIG menu: Use the 'Up' and 'Down'
keys to select a value for the first
digit of the code

Press the 'Enter' key

4

The second digit flashes.

Repeat steps 3 and 4 for the second,

5

third, fourth and fifth digits of the
access code until...

21

Access Code

the selected code starts flashing.

Select Altern. Config

(1)

(2)

(3)

Press the 'Enter' key

6

The first parameter of the CONFIG
menu is displayed

Selecting altern­ative (emergency
power) setup

Configuring the
digital I/Os on the
Fronius Dataman­ager

The setups with the designation "EmergencyPower" are available as "Alternative (emer­gency power) setups":

- EmergencyPower 50Hz: for all countries with a nominal frequency of 50 Hz

- EmergencyPower 60Hz: for all countries with a nominal frequency of 60 Hz

Use the 'Up' and 'Down' keys to

1

select the Alternative (emergency
power) setup

Press the 'Enter' key

2

Open the Fronius system monitoring web page (= Fronius Datamanager)

1

Select settings

2

Sign in as "Service"

3

Select IO mapping from the menu

4

Switch user

5

Activate and open "Emergency power"

6

22

After installing the wiring, configure the pins under "Emergency power" (1)

(1)

(2)

(1)
(2)

7

Configuring the
system overview
on the Fronius
Datamanager

The default values for the pins correspond to the settings used in the document
entitled "Fronius Energy Package - Examples of emergency power switchover".

Check the wiring again

8

Configure the locking feedback (optional) (2)

9

Click the "save" button (3) to apply the entries

10

Under "Settings" on the Fronius system monitoring (= Fronius Datamanager) web

1

page, select "System overview" from the menu

Set the emergency power operating mode (1) to "Auto"

2

EN

Configuring the
energy manage­ment on the
Fronius Dataman­ager (option)

Click the "save" button (2) to apply the entries

3

Under "Settings" on the Fronius system monitoring (= Fronius Datamanager) web

1

page, select "Energy management" from the menu

The remaining battery capacity (1) and SoC warning level (2) can be set under
"Energy management".

Click the "save" button (3) to apply the entries

2

23

TASK TEST CONFIRMATION

The inverter, battery, and all other necessary compo­nents have been installed and assembled correctly.

The backup power changeover unit has been installed
and commissioned in accordance with the country-spe­cic installation guidelines and as outlined in the docu­mentation.

The software settings have been carried out in accor-

dance with the „Backup power conguration“ chapter in

the documentation.

A warning notice has been put on the switch cabinet to
warn that a backup power supply has been installed.

Start the inverter in grid power feed operation. Check whether the inverter starts in grid power feed

operation and a power shift takes place. (Test duration
6 minutes).

Disconnect the PV system from the public grid. This

can be e󰀨ected using a disconnecting device in the

upstream AC path or the disconnecting devices (e.g. NH
fuse) of the building connection. The disconnection must
occur before the Smart Meter (grid side).

Check whether the inverter starts in stand-alone opera­tion. The changeover can take more than 1 minute.

Measure the voltage/frequency in the established stand­alone operation.

Set value: 230 V / ± 10 % / 53 Hz
USA: 120 V / ± 10 % / 63 Hz

Reconnect the PV system to the public grid. The time taken from the end of stand-alone operation

until the subsequent connection of the contactors in
the backup power changeover unit must be at least 10
seconds. The changeover can take more than 1 minute.

Only then may the inverter resume grid power feed op­eration. This may take several minutes due to national
requirements (test duration 6 minutes).

/ Perfect Welding / Solar Energy / Perfect Charging

CHECKLIST - BACKUP POWER

Once installation, conguration, and commissioning have been successfully completed, this checklist must be worked through to ensure the back­up power changeover function and backup power mode are operating correctly.

I hereby conrm that the backup power changeover function and backup power mode are operating correctly.

Signature

Place, date

42,0426,0365,EA 002-07042020

FRONIUS INTERNATIONAL GMBH www.fronius.com

24

Appendix

25

3-pin separation Austria with Solar Battery

26

3-pin separation Australia with Solar Battery

27

3-pin separation Austria with BYD

28

3-pin separation Australia with BYD

29

3-pin separation with grid and system protection
Austria with Solar Battery

30

4-pin separation Germany with Solar Battery

31

4-pin separation Germany with BYD

32

4-pin separation with grid and system protection
Germany with Solar Battery

33

4-pin seperation with grid and system protection
Italy with Solar Battery

34

Fronius Symo Hybrid and BYD Battery-Box
Premium HV

35

FRONIUS INTERNATIONAL GMBH

Froniusstraße 1

A-4643 Pettenbach

AUSTRIA

[e-mail]

www.fronius.com

Under www.fronius.com/contact you will find the addresses

of all Fronius Sales & Service Partners and locations.