FRO­NIUS Symo 12.0-3 208-240 User manual

/ Perfect Charging / Perfect Welding / Solar Energy
42,0426,0202,EA 007-24082017
Fronius Symo - Installation
10.0-3 208-240 / 12.0-3 208-240
10.0-3 480 / 12.5-3 480
15.0-3 208
15.0-3 480 / 17.5-3 480
20.0-3 480 / 22.7-3 480
24.0-3 480
Installation Instructions
Inverter for grid-connected photo-
voltaic systems
EN-US

2

3
EN-US
Contents
Location selection and installation position................................................................................................ 5
Explanation of Safety Instructions......................................................................................................... 5
Safety.................................................................................................................................................... 5
Intended Use......................................................................................................................................... 6
Location Selection................................................................................................................................. 6
Installation position of the inverter ........................................................................................................ 8
General location selection..................................................................................................................... 9
Example: Installation of several inverters ............................................................................................. 10
Do not ground the solar modules.......................................................................................................... 10
Attaching the Mounting Bracket ................................................................................................................. 11
Safety.................................................................................................................................................... 11
Selecting dowels and screws................................................................................................................ 11
Screw Recommendation....................................................................................................................... 11
Opening the inverter ............................................................................................................................. 11
Installing the wall bracket on a wall....................................................................................................... 12
Install mounting bracket on a mast or beam ......................................................................................... 13
Attaching the mounting bracket to a metal carrier ................................................................................ 13
Do not warp or deform the mounting bracket........................................................................................ 13
Knockouts .................................................................................................................................................. 14
Safety.................................................................................................................................................... 14
General ................................................................................................................................................. 14
Knock or drill out knockouts .................................................................................................................. 15
Suitable Grids ............................................................................................................................................ 17
Appropriate Grids.................................................................................................................................. 17
Connecting the inverter to the public grid (AC) .......................................................................................... 18
Safety.................................................................................................................................................... 18
Permitted Cables .................................................................................................................................. 18
Connecting Aluminum Cables............................................................................................................... 20
Monitoring the Grid ............................................................................................................................... 20
Fronius Symo 15.0-3 208 – ferrite ring ................................................................................................. 20
Connecting the inverter to the public grid (AC) ..................................................................................... 20
Maximum AC Fuse Protection .............................................................................................................. 22
Additional external AC and/or DC disconnect....................................................................................... 22
String Fuses............................................................................................................................................... 23
String Fuses.......................................................................................................................................... 23
Notes on the Multi-MPP Tracker inverter................................................................................................... 24
Multi MPP Tracker – inverter ................................................................................................................ 24
Connecting solar module strings to the inverter (DC) ................................................................................ 25
Safety.................................................................................................................................................... 25
General information about solar modules ............................................................................................. 26
Connecting aluminum cables................................................................................................................ 26
Connecting Solar Module Strings to the Inverter (DC).......................................................................... 27
Data communication .................................................................................................................................. 29
Lay data communication cables............................................................................................................ 29
Install data manager in inverter............................................................................................................. 30
Clipping the Inverter onto the Mounting Bracket........................................................................................ 32
Clipping the Inverter onto the Mounting Bracket................................................................................... 32
Seal Conduits............................................................................................................................................. 35
Using for the first time ................................................................................................................................ 36
Using the Inverter for the First Time ..................................................................................................... 36
Options....................................................................................................................................................... 38
Options.................................................................................................................................................. 38
Notes on Software Updates ....................................................................................................................... 39
Notes on the software update ............................................................................................................... 39
Field Adjustable Trip Points ....................................................................................................................... 40
Special Purpose Utility-Interactive ............................................................................................................. 44
USB Stick as a Data Logger and for Updating Inverter Software .............................................................. 46
USB stick as a data logger.................................................................................................................... 46
Data on the USB stick........................................................................................................................... 46
Data Quantity and Memory Capacity .................................................................................................... 47

4
Buffer Memory ...................................................................................................................................... 47
Suitable USB Sticks .............................................................................................................................. 48
USB Stick for Updating Inverter Software............................................................................................. 48
Removing the USB Stick....................................................................................................................... 49
Notes on Maintenance ............................................................................................................................... 50
Maintenance ......................................................................................................................................... 50
Cleaning................................................................................................................................................ 50

5
EN-US
Location selection and installation position
Explanation of
Safety Instruc-
tions
If you see any of the symbols depicted in the "Safety Rules," special care is required.
Safety
DANGER! Indicates an immediate danger. Death or serious injury may result if
appropriate precautions are not taken.
WARNING! Indicates a possibly dangerous situation. Death or serious injury may
result if appropriate precautions are not taken.
CAUTION! Indicates a situation where damage or injury could occur. Minor injury
or damage to property may result if appropriate precautions are not taken.
NOTE! Indicates the possibility of flawed results and 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.
WARNING! Incorrect operation and incorrectly performed work can cause seri-
ous injury and damage to property. Only qualified staff are authorized to commis-
sion your inverter and only within the scope of the respective technical
regulations. Do not start up or carry out maintenance work until you have read the
safety rules.
WARNING! Work performed incorrectly can cause serious injury and damage.
The overvoltage protection should only be installed and connected by licensed
electricians.
Follow the safety rules!
Before any installation or connection work is carried out, disconnect the AC and
DC supply to the inverter.
Fire prevention
CAUTION! Inverters and other current-carrying parts of a photovoltaic system
may be damaged through faulty or improper installation.
Faulty or improper installation may cause overheating of cables and terminals as
well as the formation of arcs. This could cause thermal damage, which in turn may
lead to fires.
Please note the following when connecting the AC and DC cables:
- Securely tighten all terminals using the proper torque listed in the operating
instructions.

6
The manufacturer's specifications for connection, installation and operation must be ob-
served. You must carefully follow all installation steps and make all connections in accor-
dance with specifications and regulations to minimize any risk of danger.
The tightening torques for the respective terminals are listed in the operating instructions/
installation instructions for the devices.
Intended Use The solar inverter is designed exclusively to convert direct current from solar modules into
alternating current and feed this power into the public grid.
The following are deemed not to be in conformity with its intended purpose:
- utilization for any other purpose, or in any other manner
- alterations to the inverter that are not expressly recommended by Fronius
- installation of components that are not expressly recommended or sold by Fronius.
The manufacturer is not responsible for any damage resulting from improper use.
All warranty claims are considered void in such cases.
Proper use also means
- carefully reading and obeying all the instructions and safety and danger notices in the
operating instructions
- carrying out all the specified inspection and servicing work
- installation as per operating instructions.
When configuring the photovoltaic system, make sure that all photovoltaic system compo-
nents are operating completely within their permitted operating range.
All measures recommended by the solar module manufacturer for maintaining solar mod-
ule properties must be followed.
Utility company regulations regarding grid power feed must be followed.
Location Selec-
tion
Please note the following criteria when choosing a location for the inverter:
- Securely tighten all grounding terminals
(PE/GND) using the proper torque listed
in the operating instructions, even for
free grounding terminals.
- Do not overload cables.
- Check cables for damage and correct
wiring.
- Follow all safety instructions, operating
instructions, and any local connection
regulations.
Always secure the inverter to the wall bracket
with fixing screws using the torque specified
in the operating instructions.
Only put the inverter into operation with the
fixing screws securely tightened.
NOTE! Fronius will not bear any costs for production downtimes, or for installa-
tions, etc., which may arise due to a detected electric arc and its consequences.
Fronius accepts no liability for fires which may break out despite integrated arc
detection/interruption (e.g., due to a parallel arc).
NOTE! Before an inverter can be reset following a detected electric arc, check the
entire affected photovoltaic system for any damage.
3
2
2.5 Nm
1

7
EN-US
The inverter is suitable for indoor installation.
The inverter is suitable for outdoor installation.
Because of its NEMA 4X protection class, the inverter is not susceptible
to hose water on any side and can also be operated in moist environ-
ments.
In order to keep inverter heating as low as possible, do not expose the
inverter to direct sunlight. The inverter should be installed in a protected
location, e.g., near the solar modules or under an overhanging roof.
IMPORTANT! The inverter must not be installed or operated above an
altitude of 11,154 ft. (3400 m).
The maximum permissible DC voltage of the inverter depends on the al-
titude.
UDCmax at an altitude of:
Symo 10.0-3 – 12.0-3 208-240
0 to 11,154 ft ( 0 to 3400 m). = 600 V
Symo 10.0-3 – 24.0-3 480
0 to 6561 ft ( 0 to 2000 m). = 1000 V
6531 to 8202 ft (2000 to 2500 m). = 950 V
8202 to 9842 ft (2500 to 3000 m). = 900 V
9842 to 11154 ft (3000 to 3400 m). = 850 V
The output power reduces when the device temperature is too high, and
this may occur earlier than normal at increased altitudes.
Do not install the inverter:
- where it may be exposed to ammonia, corrosive gases, acids or
salts
(e.g., fertilizer storage areas, vent openings for livestock stables,
chemical plants, tanneries).
During certain operation phases the inverter may produce a slight noise.
For this reason it should not be installed in an occupied living area.
Do not install the inverter in:
- areas where there is an increased risk of accidents, e.g., from farm
animals (horses, cattle, sheep, pigs, etc.)
- stables or adjoining areas
- storage areas for hay, straw, chaff, animal feed, fertilizers, etc.
10.0-3 - 12.0-3 208-240
UDC max
0 - 11154 ft.
(0 - 3400 m)
ft. (m)
600 V
1000 V
0 - 6561 ft.
(0 - 2000 m)
> 8202 - 9842 ft.
(> 2500 - 3000 m)
> 6561 - 8202 ft.
(> 2000 - 2500 m)
> 9842 - 11154 ft.
(> 3000 - 3400 m)
950 V
900 V
850 V
UDC max
ft. (m)
10.0-3 - 24.0-3 480
> 11154 ft.
> 3400 m
NH3

8
Installation posi-
tion of the invert-
er
The inverter is designed to be dustproof in principle. However, in areas
of high dust accumulation, the cooling surfaces can become dusty, which
can impair the thermal performance. In this case, the dust must be re-
moved regularly. We therefore recommend that installation is not carried
out in areas and environments with high dust accumulation.
Do not install the inverter in:
- greenhouses
- storage or processing areas for fruit, vegetables, or viniculture prod-
ucts
- areas used in the preparation of grain, green fodder, or animal
feeds.
The inverter is suitable for vertical installation on a vertical wall or column.
The inverter is suitable for a horizontal installation position.
The inverter is suitable for installation on a sloping surface.
Do not install the inverter on a sloping surface with the connections up-
wards.
Do not install the inverter in a sloping position on a vertical wall or col-
umn.
Do not install the inverter in a horizontal position on a vertical wall or col-
umn.

9
EN-US
General location
selection
Please note the following criteria when choosing a location for the inverter:
Do not install the inverter with the connections upwards on a vertical wall
or column.
Do not install the inverter overhanging with the connections upwards.
Do not install the inverter overhanging with the connections downwards.
Do not install the inverter on the ceiling.
Only install on a solid surface.
Max. ambient temperatures: -40°F/+140°F (-40°C/+60°C)
Relative humidity: 0–100%
The air flow direction within the inverter is from right to top (cold air intake on the right, hot
air outflow at the top). The waste air may reach a temperature of up to 70°C.
4 in.
100 mm
4 in.
100 mm
8 in.
200 mm
-40 °F - +140 °F
-40 °C - +60 °C
0 - 100 %

10
Example: Installa-
tion of several in-
verters
Do not ground the
solar modules.
The inverter is designed exclusively for
connection to and use with non-grounded
solar modules. The solar modules must not
be grounded at either the positive or nega-
tive pole.
When installing the inverter in a switch cabinet or similar closed environment, it is neces-
sary to make sure that the hot air that develops will be dissipated by forced-air ventilation.
If you wish to install the inverter on the outer walls of cattle stables, it is important to keep
a minimum clearance of 2 m between all sides of the inverter and air vents and other
openings.
The place of installation should not be exposed to ammonia, corrosive gases, salts, or
acids.
AC ~ AC ~ AC ~
DC = DC = DC =
DATCOM DATCOM
Installation example of several inverters
+
-
+-

11
EN-US
Attaching the Mounting Bracket
Safety
Selecting dowels
and screws
Screw Recom-
mendation
To install the inverter, the manufacturer recommends using steel or aluminum screws with
a diameter of 0.2–0.3 in. (6–8 mm).
Opening the in-
verter
1 2
WARNING! An electric shock can be fatal. Danger of residual voltage from ca-
pacitors. Wait until the capacitors have discharged. Discharge takes five minutes.
CAUTION! The inverter can be damaged by soiling or water on the terminals and
contacts of the connection area.
- When drilling, make sure that terminals and contacts in the connection area
do not become soiled or wet.
- The wall bracket without the power stage set does not possess the same de-
gree of protection as the complete inverter and, therefore, should not be at-
tached without a power stage set.
Protect the wall bracket from soiling and moisture during installation.
NOTE! Protection class NEMA4X is only ensured when the inverter is mounted
and firmly screwed into the wall bracket.
The wall bracket without inverter has no NEMA protection.
IMPORTANT! Depending on the surface, different mounting materials may be required for
installing the mounting bracket. These mounting materials are not part of the scope of de-
livery for the inverter. The installer is responsible for selecting the proper mounting mate-
rials.
ON
OFF
Lock
12

12
3 4
Installing the wall
bracket on a wall
The wall bracket must be secured in at least four places.
1 2
3
3
lb
4
NO NEMA
ENCLOSURE TYPE
12
Al / St
0.2 - 0.3 in.
(6 - 8 mm)
3

13
EN-US
Install mounting
bracket on a mast
or beam
For installation of the inverter on a mast or
beam, Fronius recommends using the "Po-
le clamp" (order no. SZ 2584.000) mast
mounting kit from Rittal GmbH.
The kit can be used to mount the inverter on
round or rectangular masts with the follo-
wing diameters: from 40 to 190 mm
(round), from 50 to 150 mm (rectangular)
Attaching the
mounting brack-
et to a metal carri-
er
The mounting bracket must be secured in at least four places.
1
Do not warp or
deform the
mounting bracket
1
NOTE! When attaching the mounting bracket to the wall or to a column, make
sure that the mounting bracket is not warped or deformed.

14
Knockouts
Safety
General
The wall bracket contains several knockouts of different sizes. When knocked out, the
openings are used for the inputs of various wires.
1/2 in. for data communication cable (DATCOM)
3/4 in. - 1 1/4 in. for AC and DC cables
* A grounding electrode terminal (GET) may be required depending on local regula-
tions.
The cable for the grounding electrode terminal can be fed through the designated
opening on the underside of the wall bracket.
IMPORTANT! The knockouts on the rear of the wall bracket are made of metal.
NOTE! When using the cable inlets at the back, take care to seal them according
to protection class NEMA4X before operating outdoors.
NOTE! When installing outdoors, only use waterproof conduit fittings and con-
duits. Conduit fittings and conduits are not part of the scope of supply for the in-
verter.
CAUTION! Danger of short circuit from loose metal parts from knockouts. Loose
metal parts in the inverter may cause short circuits when the inverter is powered
up. When removing knockouts, make sure that
- no loose metal parts fall into the connection area of the inverter,
- any metal pieces that do fall into the connection area are removed immedi-
ately.
1 1/4 in.1 1/4 in. 1 in.1 in.
Conduit size
1/2 in. / 3/4 in. / 1 in.
*
Conduit size
1/2 in. / 3/4 in. / 1 in. / 1 1/4 in.
**
1/2 in. ... DATCOM
3/4 in. - 1 1/4 in. ... AC ~ / DC =
*
*
** **
*
*
*
*
METAL EMPOSSING
Remove parts fallen
into the connection area before
hanging the inverter to the wall
bracket!
** **
METAL EMPOSSING
Remove parts fallen
into the connection
area before hanging the
inverter to the wall
bracket!

15
EN-US
Knock or drill out
knockouts
IMPORTANT! The knockouts on the underside of the wall bracket may be knocked out us-
ing a hammer or screwdriver, drilled out using a step drill or opened using a hole punch.
The side knockouts and the knockouts at the back may only be drilled out with a step drill
or opened with a hole punch.
Use suitable eye protection when knocking/drilling out the knockouts.
Only knock out knockouts using a hammer or screwdriver from the in-
side outwards.
Only use suitable step drills to drill out the knockouts.
Do not use spiral drills for drilling out!
Only drill out knockouts using a step drill from the outside inwards.
When drilling out using a step drill, ensure that the DC disconnector
and the AC/DC connection block are not damaged.
When drilling out the knockouts at the back, place the wall bracket on
an even surface with the back upwards so that shavings and pieces
of metal can fall out of the wall bracket.
Attach appropriate conduits to all knocked/drilled out knockouts.
In the event of installation outside, only use watertight conduits and
conduit fittings.
Conduits and conduit fittings are not included with the inverter.
*

16
*
*
1 2

17
EN-US
Suitable Grids
Appropriate Grids Inverters can be operated in the following grids:
Delta
Setup:
208
240
220
BR
50 Hz
MG 3P
MG 1P
No neutral conductor
Nominal voltage:
208 V
240 V
220 V
220 V
50 Hz 208–240 V
Microgrid 208 V
Microgrid 240 V
Appropriate inverter:
Symo 10.0-3 208-240 /
12.0-3 208-240 / 15.0-3 208
WYE
Setup:
208 N
220 N
BR N
50 HN
HI2
480 N
440 N
50 HN
MG 3N
MG 2N
MG 5N
MG 6
CAL3
HI3
Neutral conductor required
Nominal voltage:
208 V
220 V
220 V
50 Hz 208–240 V
208 V
480 V
440 V
50 Hz 415 V
Microgrid 208 V
Microgrid 50 Hz 208–240 V
Microgrid 50 Hz 480 V
Microgrid 480 V
480 V
480 V
Appropriate inverter:
Symo 10.0-3 208-240 /
12.0-3 208-240 / 15.0-3 208
Symo 10.0-3 480 / 12.5-3
480 / 15.0-3 480 / 17.5-3
480 / 20.0-3 480 / 22.7-3
480 / 24.0-3 480
Stinger
Setup:
240 N
50 HN
MG 1N
MG 2N
HI1
Neutral conductor required
Nominal voltage:
240 V
50 Hz 208–240 V
Microgrid 240 V
Microgrid 50 Hz 208–240 V
208 V
Appropriate inverter:
Symo 10.0-3 208-240 /
12.0-3 208-240
=
~
L1
L2
L3 L2-L3
120°
=
~
L1
L2
L3
N
L2-L3
120°
=
~
L3
L1
L2 NL1-NL2-N
120°
L2-L3
L3-L1

18
Connecting the inverter to the public grid (AC)
Safety
Permitted Cables AC cables with the following design can be connected to the AC terminals of the inverter:
WARNING! An electric shock can be fatal. Inadequately sized electrical compo-
nents can cause serious injury and damage to property.
- All electrical connections must be made in accordance with the National
Electrical Code, ANSI/NFPA 70, and any other regulations applicable to the
installation site.
- Installations in Canada must be carried out in accordance with applicable Ca-
nadian standards.
- Use min.194°F (90°C) copper wire for all grounding wires (see NEC table
250.122).
- Voltage drop and other considerations may mean larger cable cross sections
need to be used.
- Use only solid or stranded wire. Do not use fine stranded wire.
CAUTION! Danger of damaging the inverter due to improperly connected termi-
nals. Improperly connected terminals can cause thermal damage to the inverter
and may cause a fire. When connecting the AC and DC cables, make sure that
all terminals are tightened securely using the proper torque.
NOTE! When connecting aluminum cables:
- follow all national and international guidelines regarding the connection of
aluminum cables
- follow the instructions of the cable manufacturer
- perform an annual check to ensure that the cables are firmly attached ac-
cording to the proper torque.
NOTE! Form a min. 4 in. cable loop with all cables.
NOTE!
- Make sure that the grid neutral conductor is grounded. For insulated net-
works (without grounding), this is not the case, and operation of the inverter
is not possible.
- A neutral conductor is required for measurement purposes when operating
the inverter. The neutral conductor must have a current carrying capacity of
at least 1 A.
- Copper (Cu) or aluminum (Al): round, solid
- Copper: round, stranded, up to conductor class 4
Cu / Al Cu
AC & DC = copper cables (Cu)
The following wire combinations can be used for wiring.
Select a sufficiently large cable cross-section based on the actual device output!
AWG
round
AWG
strand
ed
AWG
stranded/round
AWG
round/round
AWG
stranded/stranded
4 2)
6 2) 6/6 4) 6/122) 6/142) 6/163)
8 2) 8 1) 8/101) 8/121) 8/141) 8/122) 8/102) 8/121) 8/141) 8/163)

19
EN-US
10 2) 10 1) 10/101) 10/121) 10/141) 10/101) 10/121) 10/141) 10/163)
12 2) 12 1) 12/101) 12/121) 12/141) 12/161) 12/101) 12/121) 12/141) 12/161)
14 2) 14 1) 14/101) 14/121) 14/141) 14/161) 14/101) 14/121) 14/141) 14/161)
16 3) 16 3) 16/141) 16/161) 16/103) 16/121) 16/141) 16/161)
AC & DC = copper cables (Cu)
The following wire combinations can be used for wiring.
Select a sufficiently large cable cross-section based on the actual device output!
AWG
round
AWG
strand
ed
AWG
stranded/round
AWG
round/round
AWG
stranded/stranded
AC & DC = aluminum cables (Al)
The following wire combinations can be used for wiring.
Select a sufficiently large cable cross-section based on the actual device output!
AWG
round
AWG
strand
ed
AWG
stranded/round
AWG
round/round
AWG
stranded/stranded
4 2)
6 2) 6 4) 6/122) 6/142) 6/165)
8 2) 8 2) 8/102) 8/122) 8/142) 8/122) 8/102) 8/122) 8/142) 8/165)
10 2) 10 2) 10/102) 10/122) 10/142) 10/102) 10/122) 10/142) 10/165)
12 2) 12 2) 12/102) 12/122) 12/142) 12/102) 12/122) 12/142) 12/162)
14 2) 14 2) 14/102) 14/122) 14/142) 14/162) 14/102) 14/122) 14/142) 14/162)
16 5) 16 5) 16/142) 16/162) 16/105) 16/122) 16/142) 16/162)
1) tested and inspected as per UL
2) not inspected as per UL; connection possible
3) with ferrules only
4) use stranded PV (ZKLA) or 2-wire
5) not inspected as per UL; connection possible; AWG 16 with ferrules only
Minimum AWG as per NEC
10.0-3 208-240 12.0-3 208-240 15.0-3 208
Copper (Cu)/aluminum (Al)
208 VAC AWG 10/AWG 10 AWG 10/AWG 8 AWG 8/AWG 6
220 VAC AWG 10/AWG 10 AWG 10/AWG 8
240 VAC AWG 12/AWG 10 AWG 10/AWG 10
10.0-3 480 12.5-3 480 15.0-3 480
Copper (Cu)/aluminum (Al) 440 VAC AWG 14/AWG 12 AWG 14/AWG 12 AWG 14/AWG 12
480 VAC AWG 14/AWG 12 AWG 14/AWG 12 AWG 14/AWG 12
17.5-3 480 20.0-3 480 22.7-3 480
Copper (Cu)/aluminum (Al) 440 VAC AWG 12/AWG 10 AWG 10/AWG 10 AWG 10/AWG 8
480 VAC AWG 14/AWG 12 AWG 12/AWG 10 AWG 10/AWG 10
24.0-3 480
Copper (Cu)/aluminum (Al) 480 VAC AWG 10/AWG 10

20
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.
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-free
and alkali-free Vaseline.
Then immediately connect it to the terminal.
Repeat the steps above whenever the cable is disconnected and then reconnected.
Monitoring the
Grid
Fronius Symo
15.0-3 208 – fer-
rite ring
1
Fronius Symo 15.0-3 208
With Fronius Symo 15.0-3 208, the three
phases and neutral conductor must be fed
through a ferrite ring. The ferrite ring is in-
cluded in the scope of delivery for the inver-
ter.
The ground conductor (PE) must not be fed
through the ferrite ring.
Connecting the
inverter to the
public grid (AC)
IMPORTANT! The ground conductor GND of the AC cable must be laid so that it is discon-
nected last.
Measure the ground conductor GND longer, for example, and loop.
NOTE! Take into account local specifications when configuring cable cross sec-
tions.
1
2
3
IMPORTANT! The resistance in the leads to the AC-side connection terminals must be as
low as possible for optimal functioning of grid monitoring.
Fronius Symo
15.0-3 208
1
NOTE! To ensure a proper ground connection, all grounding terminals GND must
be tightened with the specified torque during installation.
NOTE! Form loops of at least 4 in. (102 mm) in the AC cables when connecting
them to the AC terminals.