33
EN-US
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 averages all measuring channels and
compares the current of each measuring channel with the average value
of all channels.
If the Fronius String Control 250/25 detects that one of the measuring
channels deviates too much from the average, a status message 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
The average electric charge (Ah) of all strings at which evaluation of
“Max. Energy Deviation“ is to start. This prevents possible status mes-
sages in bad weather.
Threshold
Summary of Contents for String Control 250/25
Page 2: ......
Page 4: ...ud_fr_st_et_01382 012008 ...
Page 6: ...2 ...
Page 49: ...39 EN US ...
Page 50: ...40 ...
Page 51: ......
