Troubleshooting - SMA Sunny Island 5048 Installation Instructions Manual

Troubleshooting/Problem Solving
Displ. Level
no.
F736 3 no message from cluster on slave 3
F738 1 synchronization not successful
F739 3 internal device communication BFR-DSP missing
F740 3 internal device communication BFR-DSP on slave 1 missing
F741 3 internal device communication BFR-DSP on slave 2 missing
F742 3 internal device communication BFR-DSP on slave 3 missing
F743 3 internal device communication BFR-DSP missing
F744 3 internal device communication BFR-DSP on slave 1 missing
F745 3 internal device communication BFR-DSP on slave 2 missing
F746 3 internal device communication BFR-DSP on slave 3 missing
F747 4 short circuit or cable break on transformer temperature sensor on slave 1
F748 4 short circuit or cable break on transformer temperature sensor on slave 1
F749 4 short circuit or cable break on transformer temperature sensor on slave 2
F750 4 short circuit or cable break on heatsink temperature sensor on slave 2
F751 4 short circuit or cable break on heatsink temperature sensor on slave 3
F752 4 short circuit or cable break on heatsink temperature sensor on slave 3

19.9 Troubleshooting

Answers are provided below for faults that may occur in practice:
Why is the Sunny Island 5048 not connecting to the running generator?
• Is the fuse on the generator ok?
• Has the power allowed to be fed back into the generator during the permissible
time been exceeded ("#242.14 GnRvTm" parameter)?
If yes, "!" appears on the display. Generator connection is blocked for the set time.
Set the "#430.02 GnAck" parameter to Ackn.
• If the generator control relay (GnReq) is open:
Was the generator started manually ("242.07 GnStrMod" parameter)? Change
the setting here to autostart, if required.
Why is the display of the Sunny Island 5048 dark and why is nothing shown
on the display?
• Is the DC circuit breaker on the Sunny Island 5048 set to "On"?
In this case, the device has switched off to protect the battery against deep
discharge (see also section 13.3 "State of Charge/SOC and SOH" (Page 86)).
For information on restarting the Sunny Island 5048, see section 9.5 "Reactivating
the Device Following Automatic Shutdown" (Page 63).
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Description
SMA
Technologie AG
Technical Description