SMA SC 500HE-US - Manual (Page 23)

SMA America, LLC 3 Product Description
Operating Manual SC500HEUS-eng-BE-BUS120320 23
3.6 Sunny Central String-Monitor Controller
Depending on which options are ordered, the Sunny Central may be equipped with a Sunny Central
String-Monitor Controller for string current monitoring. The Sunny Central String-Monitor Controller
allows communication between the Sunny Central String-Monitors and the Sunny Central.
Figure 6: Sunny Central String-Monitor Controller
The Sunny Central String-Monitors measure the string currents via an integrated measuring circuit
board and continuously calculate the average value of the string currents. The measuring circuit board
compares the string currents with the average values. If a string current exceeds or falls below a
specified tolerance for the average value, a warning or fault is generated and displayed via the
Sunny WebBox user interface.