SMA SB 3300TL - Manual (Page 21)

SMA Technologie AG Device Description
Operating Instructions SB3300TL-11:FE1905 Page 17
Grid Impedance too high
When this 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 three times in
short intervals. The code is sent three times.
If the failure persists, the signal starts from the beginning.
The Sunny Boy has detected a failure as the grid impedance values are out of per-
missible range. If the inverter switches off frequently during grid monitoring because
of the above failure, a too high grid impedance might be the cause. A qualified elec-
trician can normally solve this problem by increasing the cross-section of the grid ca-
ble. Other measures can be taken as well. Any modifications of the operating
parameters require the explicit permission of the public utility company.
5 s 3 s 1 s
LED on LED off
Yellow LED is blinking 3
times in short intervals.
The signal is repeated 3 times and
then starts from the beginning.