/ Battery Charging Systems / Welding Technology / Solar Electronics
EN
Fronius String Control 250/30
Operating Instructions
System monitoring
42,0426,0134,EN 007-30082013
0
Dear reader,
Introduction Thank you for the trust you have placed in our company and congratulations on buying this
high-quality Fronius product. These instructions will help you familiarise yourself with the
product. Reading the instructions carefully will enable you to learn about the many different
features it has to offer. This will allow you to make full use of its advantages.
Please also note the safety rules to ensure greater safety when using the product. Careful
handling of the product will repay you with years of safe and reliable operation. These are
essential prerequisites for excellent results.
EN
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Contents
Safety rules ................................................................................................................................................ 5
Explanation of safety symbols .............................................................................................................. 5
General ................................................................................................................................................. 5
Proper use ............................................................................................................................................ 6
Environmental conditions...................................................................................................................... 6
Qualified service engineers................................................................................................................... 6
Safety measures at the installation location.......................................................................................... 6
EMC Device Classifications .................................................................................................................. 7
EMC measures ..................................................................................................................................... 7
Electrical installations............................................................................................................................ 7
Protective measures against ESD ........................................................................................................ 7
Safety measures in normal operation ................................................................................................... 7
Safety symbol ....................................................................................................................................... 7
Disposal ................................................................................................................................................ 8
Data protection...................................................................................................................................... 8
Copyright............................................................................................................................................... 8
General ...................................................................................................................................................... 9
Device concept ..................................................................................................................................... 9
Functional principle ............................................................................................................................... 9
Inverter.................................................................................................................................................. 9
Other system requirements................................................................................................................... 9
Proper use ............................................................................................................................................ 9
Scope of supply .................................................................................................................................... 10
Option ................................................................................................................................................... 10
Terms and abbreviations used.............................................................................................................. 10
Warning notices on the device.............................................................................................................. 11
Description of the device............................................................................................................................ 12
Safety.................................................................................................................................................... 12
Description of the device: housing ........................................................................................................ 12
Description of the device: inside the device.......................................................................................... 13
Installing the Fronius String Control 250/30............................................................................................... 15
Selecting wall plugs and screws ........................................................................................................... 15
Installation position ............................................................................................................................... 15
Selecting a location............................................................................................................................... 15
Installing the Fronius String Control 250/30.......................................................................................... 15
Fitting metric screw joints to the Fronius String Control 250/30................................................................. 17
General ................................................................................................................................................. 17
Recommended order in which to insert the metric screw joints ............................................................ 17
Fitting metric screw joints to the Fronius String Control 250/30............................................................ 17
Tightening torques for metric screw joints ............................................................................................ 18
Connecting the Fronius String Control 250/30 to the inverter ....................................................................19
Safety.................................................................................................................................................... 19
Connecting aluminium cables ............................................................................................................... 19
Preparation ........................................................................................................................................... 19
Connection with V-type terminal lug ..................................................................................................... 20
Connection with cable lug ..................................................................................................................... 20
Connecting the Fronius String Control 250/30 to the inverter............................................................... 20
Connecting solar module strings to the Fronius String Control 250/30...................................................... 21
Safety.................................................................................................................................................... 21
Notes on connecting the solar module strings to the Fronius String Control 250/30 ........................... 21
Pin assignment for grounded solar modules......................................................................................... 22
Example of pin assignment for grounded solar modules ...................................................................... 22
Connecting solar module strings to the Fronius String Control 250/30 ................................................ 22
Criteria for selecting the right string fuses.................................................................................................. 23
General ................................................................................................................................................. 23
Criteria for selecting the right string fuses............................................................................................. 23
Effects of using underrated fuses ......................................................................................................... 23
Fuse recommendations ........................................................................................................................ 23
Application example.............................................................................................................................. 23
Fuses .................................................................................................................................................... 24
EN
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Fitting string fuses...................................................................................................................................... 25
Safety.................................................................................................................................................... 25
Selecting string fuses............................................................................................................................ 25
Fitting string fuses................................................................................................................................. 25
Connecting data communication cables to the Fronius String Control 250/30 .......................................... 26
Linking options ...................................................................................................................................... 26
Additional insulation for data communication cables ............................................................................ 26
Configuration example .......................................................................................................................... 26
Safety.................................................................................................................................................... 27
Connecting the RJ45 data communication cables to the Fronius String Control 250/30 ...................... 27
Connecting multi-core data communication cables to the Fronius String Control 250/30 .................... 29
Overcurrent and undervoltage cut-out ....................................................................................................... 30
General ................................................................................................................................................. 30
Functional principle ............................................................................................................................... 30
Safety.................................................................................................................................................... 30
Restoring the power supply automatically ............................................................................................ 30
Restoring the power supply manually ................................................................................................... 31
Connecting an external power supply ........................................................................................................ 32
General ................................................................................................................................................. 32
Safety.................................................................................................................................................... 32
Connecting an external power supply................................................................................................... 32
Setting the address .................................................................................................................................... 34
Safety.................................................................................................................................................... 34
General ................................................................................................................................................. 34
Setting the address - examples ............................................................................................................ 34
Closing the Fronius String Control 250/30 ................................................................................................. 35
Safety.................................................................................................................................................... 35
Closing the Fronius String Control 250/30 ............................................................................................ 35
Settings ...................................................................................................................................................... 36
General ................................................................................................................................................. 36
Step one................................................................................................................................................ 36
Possible settings for the Fronius String Control 250/30 ........................................................................ 36
Strings per measuring channel ............................................................................................................. 36
Max. energy deviation........................................................................................................................... 36
Threshold .............................................................................................................................................. 36
Data and status message display .............................................................................................................. 37
Data display .......................................................................................................................................... 37
Status codes ......................................................................................................................................... 37
Status diagnostics and troubleshooting ..................................................................................................... 38
Safety.................................................................................................................................................... 38
Status diagnostics and troubleshooting ................................................................................................ 38
Replace the string fuses ............................................................................................................................ 39
Safety.................................................................................................................................................... 39
Preparation ........................................................................................................................................... 39
Replacing the string fuses..................................................................................................................... 39
And finally... .......................................................................................................................................... 40
Technical data............................................................................................................................................ 41
Technical data....................................................................................................................................... 41
.............................................................................................................................................................. 42
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Safety rules
EN
Explanation of
safety symbols
General
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.
If you see any of the symbols depicted in the "Safety rules", special care is required.
The device is manufactured using state-of-the-art technology and according
to recognised safety standards. If used incorrectly or misused, however, it can
cause
- injury or death to the operator or a third party,
- damage to the device and other material assets belonging to the operating company,
- inefficient operation of the device.
All persons involved in commissioning, maintaining and servicing the device
must
- be suitably qualified,
- have knowledge of and experience in dealing with electrical installations
and
- read and follow these operating instructions carefully.
The operating instructions must always be at hand wherever the device is being used. In addition to the operating instructions, attention must also be paid
to any generally applicable and local regulations regarding accident prevention and environmental protection.
All safety and danger notices on the device
- must be kept in a legible state
- must not be damaged/marked
- must not be removed
- must not be covered, pasted or painted over.
For the location of the safety and danger notices on the device, refer to the
section headed "General remarks" in the operating instructions for the device.
Before switching on the device, rectify any malfunctions that could compromise safety.
Your personal safety is at stake!
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Proper use
The device is to be used exclusively for its intended purpose.
Any use above and beyond this purpose is deemed improper. The manufacturer shall not be liable for any damage resulting from such improper use.
Proper use also includes:
- carefully reading and obeying all the instructions and all the safety and
danger notices in the operating instructions
- performing all stipulated inspection and servicing work
- installation as specified in the operating instructions
The following guidelines should also be applied where relevant:
- Regulations of the company providing the mains power supply
- Instructions from the PV module manufacturer
Environmental
conditions
Qualified service
engineers
Operation or storage of the device outside the stipulated area will be deemed
as "not in accordance with the intended purpose". The manufacturer shall not
be held liable for any damage arising from such usage.
For exact information on permitted environmental conditions, please refer to
the "Technical data" in the operating instructions.
The servicing information contained in these operating instructions is intended
only for the use of qualified service engineers. An electric shock can be fatal.
Do not perform any actions other than those described in the documentation.
This applies even if you are qualified to do so.
All cables and leads must be secure, undamaged, insulated and adequately
dimensioned. Loose connections, scorched, damaged or inadequately dimensioned cables and leads must be immediately repaired by authorised personnel.
Maintenance and repair work must only be carried out by authorised personnel.
It is impossible to guarantee that bought-in parts are designed and manufactured to meet the demands made of them, or that they satisfy safety requirements. Use only original spare parts (also applies to standard parts).
Do not carry out any modifications, alterations, etc. to the device without the
manufacturer's consent.
Components that are not in perfect condition must be changed immediately.
Safety measures
at the installation
location
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When installing devices with openings for cooling air, ensure that the cooling air can enter
and exit unhindered through the air ducts. Only operate the charger in accordance with the
degree of protection shown on the rating plate.
EMC Device Classifications
Devices in emission class A:
- Are only designed for use in industrial settings
- Can cause line-bound and radiated interference in other areas
Devices in emission class B:
- Satisfy the emissions criteria for residential and industrial areas.
This is also true for residential areas in which the energy is supplied from the public low-voltage mains.
EMC device classification as per the rating plate or technical data.
EN
EMC measures
Electrical installations
Protective measures against ESD
In certain cases, even though a device complies with the standard limit values
for emissions, it may affect the application area for which it was designed (e.g.
when there is sensitive equipment at the same location, or if the site where the
device is installed is close to either radio or television receivers). If this is the
case, then the operator is obliged to take appropriate action to rectify the situation.
Electrical installations must only be set up set up to the relevant national and
local standards and regulations.
Danger of damage to electrical components from electrical discharge. Suitable
measures should be taken to protect against ESD when replacing and installing components.
Safety measures
in normal operation
Safety symbol
Only operate the device if all safety devices are fully functional. If the safety
devices are not fully functional, there is a risk of
- injury or death to the operator or a third party,
- damage to the device and other material assets belonging to the operator,
- inefficient operation of the device.
Any safety devices that are not functioning properly must be repaired by a suitably qualified engineer before the device is switched on.
Never bypass or disable safety devices.
Devices with the CE mark satisfy the essential requirements of the low-voltage
and electromagnetic compatibility directives. Further details can be found in
the appendix or the section headed "Technical data" in your documentation.
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Disposal
Do not dispose of this device with normal domestic waste! To comply with the
European Directive 2002/96/EC on Waste Electrical and Electronic Equipment and its implementation as national law, electrical equipment that has
reached the end of its life must be collected separately and returned to an approved recycling facility. Any device that you no longer require must either be
returned to your dealer or given to one of the approved collection and recycling
facilities in your area. Ignoring this European Directive may have potentially
adverse affects on the environment and your health!
Data protection
Copyright
The user is responsible for the safekeeping of any changes made to the factory settings. The manufacturer accepts no liability for any deleted personal
settings.
Copyright of these operating instructions remains with the manufacturer.
The text and illustrations are all technically correct at the time of printing. We
reserve the right to make changes. The contents of the operating instructions
shall not provide the basis for any claims whatsoever on the part of the purchaser. If you have any suggestions for improvement, or can point out any
mistakes that you have found in the instructions, we will be most grateful for
your comments.
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General
Device concept The Fronius String Control 250/30 is designed for use in grid-connected photovoltaic sys-
tems with multiple solar module strings.
Between 10 and 30 solar module strings can be combined at the input to the Fronius String
Control 250/30 in order to reduce it to just one DC+ and one DC- main line at the output.
The Fronius String Control 250/30 monitors the incoming solar module strings in order to
detect errors in the solar module field.
If used together with a Fronius monitoring system (e.g. Fronius Solar.web, etc.) and a
Fronius Datalogger, status codes can also be sent by e-mail or SMS. This means that a
faulty solar module will be quickly detected.
EN
Functional principle
Inverter The Fronius String Control 250/30 is only suitable for use with the following Fronius invert-
Other system requirements
- Up to six incoming solar module strings are combined to form a single measuring
channel.
- Five measuring channels record the total current from the connected solar module
strings over the entire feed-in day.
- In the evening, the Fronius String Control 250/30 calculates the mean value for all
measuring channels.
- The Fronius String Control 250/30 compares the current of each measuring channel
against the mean value for all measuring channels.
- If the Fronius String Control 250/30 detects that one of the measuring channels is deviating from this mean, a status code is sent to the Fronius Datalogger.
- The permitted deviation from the mean can be defined as required.
ers:
- Fronius Agilo
- Fronius CL
- Fronius Datalogger
- Fronius system monitoring
- PC with the Fronius Solar.access software installed
- or PC with internet connection and access to Fronius Solar.web
Proper use The device is intended solely for use as a collector and measuring device for the DC strings
of the PV modules. The device may only be used with an inverter that complies with the
statutory regulations of the installation site.
Any use above and beyond this purpose is deemed improper. The manufacturer shall not
be held liable for any damage arising from such usage.
Proper use also includes complying with all the instructions in the operating instructions.
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Scope of supply - 1 Fronius String Control 250/30
- 2 M40 metric screw joints with lock nuts
- 22 M32 metric screw joints with lock nuts
- 20 3-way 6 mm rubber inserts for M32 screw joint
- 20 3-way 7 mm rubber inserts for M32 screw joint
- 20 3-way 8 mm rubber inserts for M32 screw joint
- 11 vent plugs for 3-way 6 mm rubber inserts
- 10 vent plugs for 3-way 7 mm rubber inserts
- 10 vent plugs for 3-way 8 mm rubber inserts
- 10 dummy inserts for M32 screw joints
- 1 M20 metric screw joint with lock nut
- 2 M20 metric blank screw joint
- 1 M25 metric screw joint with lock nut
- 2 M40/M32 reducers
- 1 rubber insert 2x6 mm
- 1 silicone tube (pre-assembled for data communications cable)
- 1 fire prevention leaflet
- 1 upper mounting tab (incl. 5 screws)
- 1 lower mounting tab (incl. 2 screws)
- these operating instructions
Option If type 1 or 2 overvoltage protection is required, it can be fitted in the Fronius String Control
250/30 on the DIN rail provided for this purpose.
Terms and abbreviations used
DC 'OUT' cable The Fronius String Control 250/30 DC output cable to the invert-
er;
the polarity of the DC 'OUT' cables depends on how the solar
module strings are connected to the Fronius String Control 250/
30.
DC 'IN' cable Solar module strings from the solar modules to the Fronius
String Control 250/30;
a solar module string consists of a DC+ cable and a DC- cable.
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Warning notices
on the device
There are warning notices and safety symbols affixed to the Fronius String Control 250/30.
These warning notices and safety symbols must not be removed or painted over. They
warn against operating the device incorrectly, as this may result in serious injury and damage.
Safety symbols:
EN
Risk of serious injury and damage due to incorrect operation
Do not use the functions described here until you have thoroughly read and understood the following documents:
- these operating instructions
- all the operating instructions for the system components of the photovoltaic
system, especially the safety rules
Dangerous electrical voltage
Do not dispose of used devices with domestic waste. Dispose of them according
to safety rules.
Text of the warning notices:
WARNING!
An electric shock can be fatal.
Danger from DC voltage in solar modules.
More than one power supply source. Disconnect from all power supply sources before
starting any maintenance work.
Make sure that both the input side and output side of the device are de-energised before
opening the device.
Dangerous voltage from solar modules that are exposed to light!
The connection compartment may only be opened by qualified electricians.
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Description of the device
(6)(7)
(8) (9)
(10)
(11)
Safety
Description of the
device: housing
(1)
(2) (4)(3)
WARNING! Operating the equipment incorrectly can cause serious injury and
damage. Do not use the functions described until you have thoroughly read and
understood the following documents:
- these operating instructions
- all the operating instructions for the system components, especially the safety rules
(6)(5)
Fronius String Control 250/30 - Oblique view from the
front
Item Description
(1) Housing
(2) Upper mounting tab
(3) Cover
(4) Cover fasteners
(5) Lower mounting tab
(6) Pressure equalisation membrane
(7) Cable entry for M20 metric screw joint
(for AC power pack)
Cable diameter 8 - 13 mm
Only required if optional DIN rail power pack is used.
(8) Cable entry for M20 metric screw joint
(for grounding cable)
Cable diameter 8 - 13 mm
Only required if optional overvoltage protection is used.
(9) Cable entry for M25 metric screw joint
(for data communication cables)
Fronius String Control 250/30 - Underside
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