Fronius IG 300 - Manual (Page 47)

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The string control system, which is available as an optional extra, combines 5 strings of
solar modules to form a single measuring channel. The string control system compares
the current on each measuring channel with the average value for all the measuring
channels. If the difference between these two values is unacceptably large, an error
message will appear. Users/operators have the option of specifying how great a deviati-
on from the mean is permissible.
The „FRONIUS IG.access“ supports the sending out of error messages by e-mail or
SMS for the string control system as well as other components of the package. As a
result, a dirty or defective solar module can be tracked down immediately.
The string control system also bundles together all the solar module strings to form a
single positive and negative pole. Spaces are provided to accommodate push-fit fuses.
Assuming that the fuses installed have the correct rating, each separate string will be
protected against excess current.
The FRONIUS IG supports many different add-on system components such as:
-
Facility for the FRONIUS IG to communicate with external add-on system compon-
ents, e.g. other FRONIUS IGs
- Datalogger (for using a PC to record and manage data from your photovoltaic
system), including datalogger and modem interface
- Various large-format displays (FRONIUS IG Public Display)
- Actuators / relays / alarms (FRONIUS IG signal card)
- Sensors (temperature / insolation / consumption meter)
These add-on system components are supplied in the form of plug-in cards (similar to
those for a PC).
To increase flexibility, all add-on system components can also be supplied in an external
version with a separate housing.
FRONIUS developed LocalNet to make these add-on system components flexible and
capable of being used in a wide variety of different applications. LocalNet is a data
network which enables more than one FRONIUS IG to be linked up with the add-on
system components.
The LocalNet is a bus system. Just a single cable is all that is required for one or more
FRONIUS IGs to communicate with all the add-on system components. This results in
the expense of cabling being kept to an absolute minimum.
Further information can be found in the chapter entitled “LocalNet” in the installation and
servicing instructions.
Supplementary information
Add-on system
components
String control
system