SMA SB 4200TL Multi-String - Manual (Page 25)

SMA Technologie AG Device Description
Operating Instructions SB4200-12:FE4804 Page 25
Drastic Change of Differential Current
When the failure occurs, the yellow failure LED is on for five seconds and then starts
the blinking code by staying off for three seconds and then blinking seven times in
short intervals. The code is sent three times.
If failure persists, the signal starts from the beginning.
The Sunny Boy 4200TL Multi-String has detected a drastic change of differential cur-
rent and immediately interrupted its connection to the grid. The all-pole sensitive dif-
ferential current monitoring integrated in the inverter monitors the discharge current
to ground from the grid connection of the inverter to the PV generator. This additional
personnel safety concept reacts to a change of differential current of IDN > 30 mA
and disconnects the inverter from grid within 0.2 seconds.
5 s 3 s 1 s 1 s 1 s 1 s 1 s 1 s
LED on LED off
Yellow LED is blinking
7 times in short
The signal is repeated 3 times and
then starts from the beginning.