SMA SC 400HE - Manual (Page 40)

4 Sunny Central Control SMA Solar Technology AG
40 SC4-63HE-BE-BEN103280 Operating Manual
✖ Does the error 0016 appear on the display?
The test report was not sent.
• The meaning of the error code in the bottom
line is described in the NET Piggy-Back user
manual.
4.6 Analog Sensors and External Signals
4.6.1 Calculating Gain and Offset of External Sensors
To obtain specific measurement results from the external sensors, you have to calculate the gain and
offset of each sensor in advance.
Gain
The gain is obtained by dividing the value range by the measuring range.
Gain = value range/measuring range
Offset
The offset is calculated by subtracting the product of the gain factor and the lower end of the
measuring range from the lower end of the display range.
Offset = lower end of value range ‒ (gain factor x lower end of measuring range)
Calculation
M is a measured value in a range between Mu and Mo
W is the value displayed in a range between Wu and Wo
Explanation of the Symbols Used
Gain: V = (Wo – Wu) / (Mo –Mu)
Offset: O = Wu – (V x Mu)
Display on the Sunny Central Control: W = (V x M) + O
M Measured value Mo Upper end of measuring range
Mu Lower end of measuring range O Offset
G Gain W Value
Wo Upper end of value range Wu Lower end of value range