SMA Sunny Island 5048 Installation Instructions Manual page 151

SMA
Technologie AG
• The battery fuse (NH fuse (DC)) has been triggered.
Why is it not possible to change the parameters?
• Has the installer password been entered correctly? Check whether you are
actually in "Installer Level" (see section 10.5 "Entering the Installer Password"
(Page 72)). If necessary, repeat the calculation and entry of the password.
• You are in the "100-Meters" (measuring data) menu or the "300-Diagnose"
(Diagnosis) menu. You can only read the data values shown here.
• Some parameters can only be changed in standby mode or in the QCG (see e.g.
the "242.07 GnStrMod" parameter in section 18.2 "Adjustable System
Parameters" (Page 129)). Stop the Sunny Island 5048 as described in section 9.2
"Stopping" (Page 62). Note that this causes a dropout in the stand-alone grid and
the loads are no longer supplied.
Why does the Sunny Island 5048 always connect to the running generator for
a brief time only?
• The limits for the maximum permissible AC voltage or the minimum permissible
frequency of the generator are too strict (parameter in menu "#242 General
Settings"). Change voltage and/or frequency limits according to the technical
data of your generator.
Why is the stand-alone grid frequency not at 50 Hz?
• The Sunny Boy inverter is controlled via the frequency (see section 16.3
"Frequency Shift Power Control (FSPC)" (Page 119)).
• The "AFRA" function of the Sunny Island 5048 is activated (see section 12.5
"Automatic Frequency Adjustment" (Page 84)).
• Power fluctuations cause frequency deviations.
• Although the generator runs in droop mode at an average of 50 Hz, the Sunny
Boys can be shut down by the frequency.
Why does the "VAC-Low" error (output voltage too low) also occur when the
Sunny Island 5048 is started?
• A permanent short circuit exists in the stand-alone grid. Check the AC output
connections of the stand-alone grid (see section 6.3 "AC Connection" (Page 38)).
• The loads connected to the stand-alone grid are too heavy. The power/electrical
energy of the Sunny Island 5048 is not sufficient to supply the loads. Switch off
some of the loads and restart the Sunny Island 5048.
What happens when a battery cell can no longer be used?
• Remove the unusable cell from your battery bank. Then start the Sunny Island
5048 and change the battery voltage in the QCG under "New Battery".
Technical Description
Troubleshooting/Problem Solving
SI5048-11:EE4206 Page 151