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
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