FRO­NIUS Symo Hybrid 3.0-3-S User manual

/ Battery Charging Systems / Welding Technology / Solar Electronics
42,0426,0172,EN 002-21082013
Fronius Symo
Explanation of symbols and choice
of location
Notes regarding installation and
connection
Operating Instructions
Grid-connected inverter
EN

0

1
EN
Contents
Explanation of symbols .............................................................................................................................. 3
Explanation of safety symbols .............................................................................................................. 3
Explanation of symbols - choice of location .......................................................................................... 3
Explanation of symbols - installation position ....................................................................................... 4
Choice of location ...................................................................................................................................... 6
Proper use ............................................................................................................................................ 6
General comments regarding choice of location...................................................................................6
Installation notes ........................................................................................................................................ 7
Selecting dowels and screws................................................................................................................ 7
Recommended screws ......................................................................................................................... 7
Fitting the wall bracket .......................................................................................................................... 7
Notes regarding grid connection ................................................................................................................ 8
Monitoring the Grid ............................................................................................................................... 8
AC terminals ......................................................................................................................................... 8
Type of AC cable .................................................................................................................................. 8
Connecting aluminum cables................................................................................................................ 8
Cross-section of the AC cable .............................................................................................................. 9
Connecting the inverter to the public grid (AC) ..................................................................................... 9
Maximum fuse rating on alternating current side .................................................................................. 10
Notes regarding DC connection................................................................................................................. 11
General comments regarding solar modules ........................................................................................11
DC terminals ......................................................................................................................................... 11
Connecting aluminum cables................................................................................................................ 11
Inverter DC connection ......................................................................................................................... 12
Notes regarding inverters with single and multiple MPP trackers .............................................................. 13
Inverter with single MPP tracker ........................................................................................................... 13
Inverter with multiple MPP trackers ...................................................................................................... 13
Notes regarding the laying of data communication cables ........................................................................ 15
Laying data communication cables....................................................................................................... 15
Notes regarding attaching the inverter to the wall bracket......................................................................... 16
Attaching the inverter to the wall bracket .............................................................................................. 16
Notes regarding starting up for the first time.............................................................................................. 17
Notes regarding starting up for the first time......................................................................................... 17
Notes regarding software updates ............................................................................................................. 18
Notes regarding software updates ........................................................................................................ 18
USB Stick as a Data Logger and for Updating Inverter Software .............................................................. 19
USB stick as a data logger.................................................................................................................... 19
Data on the USB stick........................................................................................................................... 19
Data amount and memory capacity ...................................................................................................... 20
Buffer memory ...................................................................................................................................... 20
Suitable USB sticks............................................................................................................................... 21
USB stick for updating the inverter software......................................................................................... 22
Remove USB stick ................................................................................................................................ 22
Notes regarding maintenance.................................................................................................................... 23
Maintenance ......................................................................................................................................... 23
Cleaning................................................................................................................................................ 23

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3
EN
Explanation of symbols
Explanation of
safety symbols
If you see any of the symbols depicted in the "Safety rules", special care is required.
Explanation of
symbols - choice
of location
DANGER! indicates immediate and real danger. If it is not avoided, death or se-
rious injury will result.
WARNING! indicates a potentially dangerous situation. Death or serious injury
may result if appropriate precautions are not taken.
CAUTION! indicates a situation where damage or injury could occur. If it is not
avoided, minor injury and/or damage to property may result.
NOTE! indicates a risk of flawed results and possible damage to the equipment.
IMPORTANT! indicates tips for correct operation and other particularly useful information.
It does not indicate a potentially damaging or dangerous situation.
The inverter is suitable for installation indoors.
The inverter is suitable for installation outdoors.
Its IP 55 degree of protection means that the inverter is resistant to water
jets from any direction and can also be used in damp environments.
In order to minimise the heating up of the inverter, do not expose it to di-
rect insolation. The inverter should ideally be mounted in a protected po-
sition, e.g. in the vicinity of the solar modules or beneath the eaves.
=
L1
N
+
-
~
=
L1
N
+
-
~
IP 55
=
L1
N
+
-
~
=
L1
N
+
-
~

4
Explanation of
symbols - instal-
lation position
UDCmax at an altitude of:
0 to 2000 m = 1000 V
2000 to 2500 m = 900 V
2500 to 3000 m = 815 V
3000 to 3400 m = 750 V
IMPORTANT! The inverter must not be installed or used at altitudes
above 3400 m.
Do not install the inverter:
- in areas where ammonia, corrosive vapours, acids or salts are
present
(e.g. fertiliser stores, ventilation openings from cattle sheds, chemi-
cal plants, tanneries, etc.)
As the inverter generates low levels of noise at certain times, it should
not be installed close to living areas.
Do not install the inverter:
- in places where there is an increased risk of damage from farm ani-
mals (horses, cattle, sheep, pigs, etc.)
- in stables or adjoining areas
- in storage areas for hay, straw, chaff, animal feed, fertilisers, etc.
Do not install the inverter:
- in places and environments subject to heavy build-up of dust
- in places and environments in which a heavy build-up of dust con-
taining conductive particles (e.g. iron chips) is likely
Do not install the inverter:
- in greenhouses
- in storage or processing areas for fruit, vegetables or winegrowing
products
- in places used to prepare grain, green fodder or animal feeds
2000 m
2000 m
2500 m
=
L1
N
+
-
~
UDCmax =
1000 V
UDCmax =
900 V
3000 m
2500 m
3000 m
3400 m
UDCmax =
815 V
UDCmax =
750 V
> 3400 m
=
L1
N
+
-
~
NH3
=
L1
N
+
-
~
=
L1
N
+
-
~
=
L1
N
+
-
~
=
L1
N
+
-
~
The inverter is designed to be installed vertically on a vertical wall or pil-
lar.

5
EN
The inverter is suitable for horizontal installation.
The inverter is suitable for installation on a sloping surface.
Do not install the inverter at an angle on a vertical wall or pillar.
Do not install the inverter horizontally on a vertical wall or pillar.
Do not install the inverter on a vertical wall or pillar with its connection
sockets facing upwards.
Do not install the inverter such that it overhangs.
Do not install the inverter such that it overhangs with its connection sock-
ets facing upwards.
Do not install the inverter on the ceiling.

6
Choice of location
Proper use The solar inverter is intended exclusively to convert direct current from solar modules into
alternating current and to feed this into the public grid.
Utilisation not in accordance with the intended purpose comprises:
- utilisation for any other purpose or in any other manner
- making any modifications to the inverter that have not been expressly approved by
Fronius
- the installation of parts that are not distributed or expressly approved by Fronius.
Fronius shall not be liable for any damage resulting from such action.
No warranty claims will be entertained.
Proper use includes:
- carefully reading and obeying all the instructions and all the safety and danger notices
in the operating instructions
- performing all stipulated inspection and maintenance work
- installation as specified in the operating instructions
When designing the photovoltaic system, ensure that all of its components are operated
within their permitted operating ranges at all times.
Observe all the measures recommended by the solar module manufacturer to ensure the
lasting maintenance of the properties of the solar module.
Obey the regulations of the energy supply company regarding feeding energy into the grid.
General com-
ments regarding
choice of location
The following criteria should be taken into account when choosing a location for the invert-
er:
Install only on a solid surface
Max. ambient temperatures:
-25 °C / +60 °C
Relative humidity:
0 - 100%
The airflow within the inverter is from the
left to the top (cold air taken in from the
left, hot air dissipated out of the top).
If the inverter is installed in a switch cabinet or a similar sealed area, then forced-air ven-
tilation must be provided to ensure adequate heat dissipation.
If the inverter is to be installed on the outer wall of a cattle shed, maintain a minimum all-
round clearance of 2 m between the inverter and all ventilation and other openings in the
building.
The installation location must not be exposed to ammonia, corrosive vapours, salts or ac-
ids.
200 mm 100 mm
150 mm
-25 °C - +60 °C
0 - 100 %

7
EN
Installation notes
Selecting dowels
and screws
IMPORTANT! Depending on the surface, different dowels and screws may be required for
installing the wall bracket. Therefore, these dowels and screws are not part of the scope of
supply for the inverter. The system installer is responsible for selecting the proper dowels
and screws.
Recommended
screws
To install the inverter, the manufacturer recommends the use of steel or aluminium screws
with a diameter of 6 - 8 mm.
Fitting the wall
bracket
NOTE! When fitting the wall bracket to the wall, ensure that the wall bracket does
not become warped or deformed.

8
Notes regarding grid connection
Monitoring the
Grid
AC terminals PE Ground conductor / grounding
L1-L3 Phase conductor
N Neutral conductor
Max. cross-section of each conductor ca-
ble:
16 mm²
Min. cross-section of each conductor cable:
in accordance with the fuse rating on the
AC side, but at least 2.5 mm²
The AC cables can be connected to the AC
terminals without ferrules.
In the case of an AC cable with a cross-section of 16 mm², ferrules can be either not used
or used only to a limited extent depending on the type of ferrule and crimping.
Type of AC cable The following types of AC cable can be connected to the AC terminals of the inverter:
Connecting alu-
minum cables
The AC-side terminals are designed for connecting single-wire, round, aluminum cables.
The following points must be taken into account when connecting aluminum cables due to
the non-conducting oxide layer of aluminum:
- Reduced rated currents for aluminum cables
- The connection requirements listed below
Connection Requirements:
Carefully clean off the oxide layer of the stripped end of the cable, e.g., using a knife.
IMPORTANTDo not use brushes, files or sandpaper. Aluminum particles may get stuck
and can transfer to other cables.
After removing the oxide layer of the cable end, rub in a neutral grease, e.g., acid- and
alkali-free Vaseline.
Then immediately connect it to the terminal.
IMPORTANT! The resistance in the leads to the AC-side connection terminals must be as
low as possible for optimal functioning of grid monitoring.
AC
PE
PE
PE
PE N
M32
L1
L1
L3
L3
L2
L2
- copper or aluminium: round, single wire
- Copper: round, finely stranded up to conductor category 4
Cu / Al Cu
max. Class 4
NOTE! Take into account local specifications when configuring cable cross sec-
tions.
1
2
3

9
EN
Repeat the steps above whenever the cable is disconnected and then reconnected.
Cross-section of
the AC cable
When using a standard M32 metric screw joint with reducer:
cable diameter 7 - 15 mm
When using an M32 metric screw joint (reducer removed):
cable diameter 11 - 21 mm
(with a cable diameter of 11 mm the strain-relief force is reduced from 100 N to a maximum
of 80 N)
With cable diameters greater than 21 mm, the M32 screw joint must be replaced by an M32
screw joint with a larger clamping area - item number: 42,0407,0780 - strain-relief M32x15
KB 18-25.
Connecting the
inverter to the
public grid (AC)
IMPORTANT! The PE ground conductor of the AC cable must be laid in such a way that it
is the last to be disconnected in the event that the strain-relief device should fail.
This can be ensured, for example, by making it somewhat longer and by laying it in a loop.
If AC cables are laid over the shaft of the
DC main switch or across the connection
block of the DC main switch, they may be
damaged when the inverter is swung in, or
they may even prevent the inverter from
being swung in.
IMPORTANT! Do not lay AC cables over
the shaft of the DC main switch or across
the connection block of the DC main switch!
NOTE! To ensure a proper ground connection, both grounding terminals must be
tightened with the specified torque when the inverter is installed.
NOTE! Form loops with the AC cables when connecting them to the AC termi-
nals!
When securing the AC cables using a metric screw joint, ensure that the loops do
not protrude beyond the connection area. Under certain circumstances it may oth-
erwise no longer be possible to close the inverter.
NOTE!
- Ensure that the grid neutral conductor is grounded. In the case of IT networks
(insulated networks with no grounding) this may not be the case; it will then
not be possible to use the inverter.
- In order to use the inverter, the neutral conductor must be connected.
A neutral conductor that is too small may adversely affect the ability of the
inverter to feed energy into the grid. The neutral conductor must therefore be
the same size as the other live conductors.

10
Example: AC cable
If overlength AC or DC cables are to be laid
in loops in the connection area, attach the
cables with cable ties to the eyelets provi-
ded on the top and bottom of the connec-
tion block.
Maximum fuse
rating on alternat-
ing current side
Inverter Phases AC power Fuse protection
Fronius Symo 3.0-3-S 3 3000 W 1 x C 25 A
Fronius Symo 3.7-3-S 3 3700 W 1 x C 25 A
Fronius Symo 4.5-3-S 3 4500 W 1 x C 25 A
Fronius Symo 8.2-3-M 3 8200 W 1 x C 25 A
NOTE! Local regulations, the energy supply company or other factors may re-
quire an earth-leakage circuit breaker in the grid line. For this situation, a type A
earth-leakage circuit breaker with a tripping current of at least 100 mA is generally
adequate. In particular cases, and depending on local factors, however, the type
A earth-leakage circuit breaker may trip at the wrong time. For this reason, Fron-
ius recommends that an earth-leakage circuit breaker that is suitable for frequen-
cy converters should be used.
max. C 25 A
AC ~
RCD
National Standards
?
Type A
YES
IΔN≥100 mA
§

11
EN
Notes regarding DC connection
General com-
ments regarding
solar modules
To enable suitable solar modules to be chosen and to use the inverter as efficiently as pos-
sible, it is important to bear the following points in mind:
- If insolation is constant and the temperature is falling, the open circuit voltage of the
solar modules will increase. The open circuit voltage must not exceed 1000 V. If the
open circuit voltage exceeds the specified values, the inverter will be destroyed and
no warranty claims will be entertained.
- The temperature coefficients on the solar modules data sheet must be observed
- More exact values for dimensioning the solar modules can be provided by suitable cal-
culation programs, like the Fronius Solar.configurator (which can be downloaded from
www.fronius.com).
DC terminals Max. cross-section of each DC cable:
16 mm²
Min. cross-section of each DC cable:
2.5 mm²
The DC cables can be connected to the DC
terminals without ferrules.
In the case of a DC cable with a cross-section of 16 mm², ferrules can be either not used
or only used to a limited extent depending on the type of ferrule and crimping.
Connecting alu-
minum cables
The DC-side terminals are designed for connecting single-wire, round aluminum cables.
The following points must be taken into account when connecting aluminum cables due to
the non-conducting oxide layer of aluminum:
- Reduced rated currents for aluminum cables
- The connection requirements listed below
Connection Requirements:
NOTE! Before you connect up the solar modules you should check that the volt-
age specified by the manufacturer corresponds to the actual measured voltage.
DC =
+
+-
+--
DC+ DC-
D1
D2
D1
D1
D1
D3
NOTE! To ensure effective strain
relief of the solar module strings,
only use cables with identical
cross-sections.
NOTE! Take into account local specifications when configuring cable cross sec-
tions.

12
Carefully clean off the oxide layer of the stripped end of the cable, e.g., using a knife.
IMPORTANT Do not use brushes, files or sandpaper. Aluminum particles may get stuck
and can transfer to other cables.
After removing the oxide layer of the cable end, rub in a neutral grease, e.g., acid- and
alkali-free Vaseline.
Then immediately connect it to the terminal.
Repeat the steps above whenever the cable is disconnected and then reconnected.
Inverter DC con-
nection
IMPORTANT! Check the polarity and voltage of the solar module strings: the voltage must
not exceed the following values:
- when installed between 0 and 2000 m above sea level: 1000 V
- when installed between 2000 and 2500 m above sea level: 900 V
- when installed between 2500 and 3000 m above sea level: 815 V
- when installed between 3000 and 3400 m above sea level: 750 V
The difference between the individual solar module strings must not exceed 10 V.
If DC cables are laid over the shaft of the
DC main switch or across the connection
block of the DC main switch, they may be
damaged when the inverter is swung in, or
they may even prevent the inverter from
being swung in.
IMPORTANT! Do not lay DC cables over
the shaft of the DC main switch or across
the connection block of the DC main switch!
1
2
3
NOTE! Only break out as many target break points as the number of cables that
are provided (e.g. if there are 2 DC cables, then break out 2 recesses).
DC+ DC-

13
EN
Notes regarding inverters with single and multiple
MPP trackers
Inverter with sin-
gle MPP tracker
Fronius Symo 3.0-3-S / 3.7-3-S / 4.5-3-S
Connecting one solar module field to an inverter with a
single MPP tracker
In the case of these inverters, there are 3
terminals available for each DC+ and DC-.
The terminals are internally connected and
are not fused. This means that a maximum
of 3 strings can be connected in parallel di-
rectly to the inverter.
In this case, the solar modules must be able
to carry at least the single reverse current
(for 2 strings) or twice the reverse current
(for 3 strings) (see data safety sheet for so-
lar module).
Where there are more than 3 strings, an ex-
ternal collection box with string fuses must
be used. In this case, the strings must con-
tain the same number of modules in each
case.
Inverter with mul-
tiple MPP track-
ers
Fronius Symo 8.2-3-M
Connecting two solar module fields to an inverter with
multiple MPP trackers
In the case of inverters with multiple MPP
trackers, there are 2 independent DC inputs
(MPP trackers) available. These can be
connected to an unequal number of solar
modules.
There are 2 terminals for DC+ available per
MPP tracker. In total there are 4 terminals
for DC-.
Connecting 2-4 strings in multiple MPP tra-
cker mode:
divide the strings between the two MPP tra-
cker inputs (DC+1/DC+2). The DC- termi-
nals can be used however you wish, as
they are internally connected.
When starting up for the first time, set MPP
TRACKER 2 to “ON” (this will also later be
possible from the Basic menu)
1
DC+
DC-1
DC+1 DC-
2123 3
PV 1
Fronius Symo
3.0-3-S / 3.7-3-S / 4.5-3-S
1
DC+1
DC-1
PV 1PV 1 PV 2
DC+1
DC-2
DC+2
DC+2 DC-
21234 12
Fronius Symo 8.2-3-M

14
Connecting multiple interconnected solar module
fields to an inverter with multiple MPP trackers using
one lead
Single MPP tracker mode on an inverter
with multiple MPP trackers:
If the strings are connected using a string
collection box and only one bus is used for
connection to the inverter, the connection
DC+1 (pin 2) and DC+2 (pin 1) must be
jumpered.
The wire diameter of the DC connection
lead and the jumpering must be the same.
Jumpering of the DC terminal is not neces-
sary, as these terminals are jumpered inter-
nally.
When starting up for the first time, set MPP
TRACKER 2 to “OFF” (this will also later be
possible from the Basic menu)
If the inverter with multiple MPP trackers is
operated in single MPP tracker mode, the
currents from the DC leads connected are
divided evenly across both inputs.
1
DC+1
DC-1 DC+1
DC+2 DC-
21234 12
PV 1
PV 2
D1 D1
=
*
*
Fronius Symo 8.2-3-M

15
EN
Notes regarding the laying of data communication
cables
Laying data com-
munication ca-
bles
IMPORTANT! Operating the inverter with an option card and 2 broken-out option card di-
visions is not permitted.
To cater for this eventuality, a relevant blanking cover (42,0405,2020) is available from
Fronius as an option.
IMPORTANT! Note the following if data communication cables are being introduced into
the inverter:
- depending on the number and cross-section of the data communication cables that
are being introduced, take the relevant blanking plugs out of the sealing insert and in-
sert the data communication cable.
- insert without fail the relevant blanking plugs into the free openings on the sealing in-
sert.

16
Notes regarding attaching the inverter to the wall
bracket
Attaching the in-
verter to the wall
bracket
The side sections of the housing lid are designed to function as holding and carrying han-
dles.
The fastening screws in the data communication area of the inverter are used for securing
the inverter to the wall bracket. Correctly tightened fastening screws are a prerequisite if
proper contact is to be established between inverter and wall bracket.
NOTE! For safety reasons, the inverter is fitted with a latch that prevents the in-
verter from being swung into the wall bracket unless the DC main switch is
switched off.
- Never attach the inverter to the wall bracket or swing it in unless the DC main
switch is switched off,
- Never use force to attach the inverter or swing it in.
CAUTION! If the fastening screws are not tightened correctly, then the inverter is
at risk of being damaged.
Fastening screws that are not correctly tightened can result in arcs occurring
when the inverter is in operation, which in turn can cause fires. Always use the
specified torque when tightening the fastening screws.

17
EN
Notes regarding starting up for the first time
Notes regarding
starting up for the
first time
When starting up the inverter for the first time, it is necessary to select various setup set-
tings.
If setup is interrupted before it is complete, it can be restarted by means of an AC reset.
An AC reset is performed by switching the automatic circuit breaker off and then on again.
The country setup can only be set when starting up the inverter for the first time. If it be-
comes necessary to modify the country setup at a later date, please contact your Technical
Support team.

18
Notes regarding software updates
Notes regarding
software updates
If the inverter is supplied with a USB stick,
the inverter software must be updated as
soon as the inverter has been commissi-
oned:
Plug the USB stick into the data com-
munication area of the inverter
Open the Setup menu
Select the "USB" menu item
Select "Update Software"
Update the software
USB
+
3
5 4 4
1
2
2
1
2
3
4
5