SMA SI 4548-US - Manual (Page 219)

SMA America, LLC 20 Troubleshooting
Operating Manual SI4548-6048-US-BE-en-20 219
Why is the display of the Sunny Island dark and why is nothing shown on the
display?
• Is the DC circuit breaker of the Sunny Island switched to "ON"? In this case, the device has
switched off to protect the battery from deep discharge (see Section 13.4 "State of Charge
(SOC) and State of Health (SOH)", page 108). After self-disconnection, restart the
Sunny Island as described in this document (see Section 9.5 "Recommissioning After Automatic
Shutdown", page 76).
• The external battery fuse has tripped.
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 87). 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 75). Note that this
causes a failure of 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 thresholds while observing the technical data of 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 48).
• The consumption of the loads connected to the stand-alone grid is too high. 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 frequency of the stand-alone grid not at 60 Hz?
• The Sunny Boy inverter is controlled via the frequency (see Section 17.5 "Frequency-Shift Power
Control (FSPC)", page 153).
• 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.