User Manual For DATCOM Components

31
Analog Input
for Voltage
Signal
General explanation:
The analog input (17) is used to analyze a voltage signal from an irradi-
ance sensor. The analysis can take place on the display of the Fronius IG
or Fronius IG Plus as well as via the „Solar.access“ software.
Channel assignment example:
- Irradiance sensor at solar
module level
Functional principle:
- An irradiance sensor with a
voltage signal is an active
sensor that sends out voltage
that rises as the irradiance
increases.
- The sensor card / box measu-
res the voltage between both
connections of the analog
input (17).
- The irradiance level is derived
from the measured voltage.
(17)
Specific values:
The sensor card has three measuring ranges at the analog input (17).
Select the measuring range using the „Solar.access“ software
- Measuring range 1 ... 0 to 100 mV
- Measuring range 2 ... 0 to 200 mV
- Measuring range 3 ... 0 to 1000 mV
Important Enter the conversion factor using the „Solar.access“ software
so that the sensor card can convert from mV to the desired unit. The
conversion factor depends on the irradiance sensor and is specified in the
sensor datasheet (e.g. 70 mV corresponds to 1000 W/m
2
).
Setup and installation example:
Measurement of solar radiation at the solar modules using an irradiance
sensor at the analog input (17).
- Attach irradiance sensor parallel to the solar modules
- Connect irradiance sensor to the analog input (17)
- Activate the analog input (17) via the „Solar.access“ software
- Assign desired channel name (e.g. „Solar Radiation“)
- Set measuring range
- Enter conversion factor
NOTE The length of the sensor cable should not exceed 30 m
(65.6 ft) so that measurement results are not distorted.