Fronius String Control 250/25 DCD DF - Manual (Page 93)

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Enter the number of solar module strings for each measuring channel.
This results in automatic compensation of measuring channel deviations,
which would only be required if there were a different number of strings
per channel. Strings per
Measuring
Channel
The 5 measuring channels record the total current of the respective con-
nected solar module strings over the entire charging day. In the evening,
the Fronius String Control 250/25 DCD DF averages all measuring chan-
nels and compares the current of each measuring channel with the ave-
rage value of all channels.
If the Fronius String Control 250/25 DCD DF detects that one of the
measuring channels deviates too much from the average, a status mes-
sage is sent to the Fronius Datalogger.
The percentage deviation above which a measuring channel is conside-
red faulty is defined in the „Max. Energy Deviation“ input field.
Standard value for max. energy deviation: 5 - 10 %
If applicable, observe information from the solar module manufacturer.
Max. Energy
Deviation
Threshold The minimum average electric charge of all strings in Ah at which the
evaluation of the „max. energy deviation“ should be active. This prevents
possible status codes in bad weather.