SMA Sunny Island 4548-US, Technical Description

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SMA America, LLC 20 Troubleshooting
Technical description SI4548_6048-US-TB_en-13 219
Why is it not possible to change the parameters?
• Has the installer password been entered correctly? Check whether you are in "Installer Level"
(see Section 10.5 "Entering the Installer Password", page 86). If necessary, repeat the
calculation and entry of the password.
• You are in the "100-Meters" (measuring data) main menu or in the "300-Diagnosis" (diagnosis)
menu, for example. You can only read the data values shown here.
• Some parameters can only be changed in standby mode or in the QCG, e.g. the parameter
"234.07 GnStrMod" (see Section 19.2 "Adjustable Parameters", page 166).
Stop the Sunny Island (see Section 9.2 "Stopping the Sunny Island (Standby)", page 74).
Note that this causes a dropout in the stand-alone grid and the loads are no longer supplied.
Why does the Sunny Island connect to the running generator only for a short
time?
• The limits for the maximum permissible AC voltage or the minimum permissible frequency of the
generator are too strict (parameter in the menu "233# Generator Control"). Change the voltage
and/or frequency limiting values while observing the technical data for your generator.
Why does the "VAC-Low" error (output voltage too low) also occur when the
Sunny Island 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 45).
• The loads connected to the stand-alone grid are too heavy. The power/electrical energy of the
Sunny Island is not sufficient to supply the loads. Switch off some of the loads and restart the
Sunny Island.
Why is the stand-alone grid frequency not at 60 Hz?
• The Sunny Boy inverter is controlled via the frequency (see Section 17.5 "Frequency-Shift Power
Control (FSPC)", page 154).
• The automatic frequency synchronization function of the Sunny Island 4548-US/6048-US is
activated (see Section 12.7 "Automatic Frequency Synchronization", page 105).
• Power fluctuations cause frequency deviations.
What do I do when a battery cell can no longer be used?
• Remove the unusable cell from your battery storage system. Start the Sunny Island and change
the battery voltage in the QCG under "New Battery".
What can I do when the QCG does not run?
• Switch off the Sunny Island (see Section 9.3 "Switching Off", page 75) and restart it
(see Section 9.1 "Switching On", page 73).