Strings Per Measuring Channel; Max. Energy Deviation; Threshold - Fronius String Control 250/25 DCD DF Instructions De Service

Strings per Enter the number of solar module strings for each measuring channel.
Measuring This results in automatic compensation of measuring channel deviations,
Channel which would only be required if there were a different number of strings
per channel.
Max. Energy The 5 measuring channels record the total current of the respective con-
Deviation 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.

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.
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