General; Device Concept; Functional Principle; Inverter - Fronius String Control 250/30 DCD DF Instructions De Service

General

Device concept

The Fronius String Control 250/30 DCD DF is designed for use in grid-connected photo-
voltaic systems 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 DCD DF in order to reduce it to just one DC+ and one DC- main line at the
output.
The Fronius String Control 250/30 DCD DF 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.
Functional princi- -
ple
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Inverter

The Fronius String Control 250/30 DCD DF is only suitable for use with the following Froni-
us inverters:
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Other system re- -
quirements -

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.
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 DCD DF calculates the mean value
for all measuring channels.
The Fronius String Control 250/30 DCD DF compares the current of each measuring
channel against the mean value for all measuring channels.
If the Fronius String Control 250/30 DCD DF detects that one of the measuring chan-
nels 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.
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
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