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10 Troubleshooting SMA Solar Technology AG
48 SB13_21TL-IA-en-65 Installation Manual
ACVtgRPro The ten-minute average of the mains voltage is no longer within the
permissible range. The mains voltage or grid impedance at the connection
point is too high. The inverter disconnects from the electricity grid to comply
with the power quality.
Corrective measures:
Check that the mains voltage at the connection point of the inverter is
permanently within the permissible range. If the mains voltage is
253 V or higher, contact the network operator. Ask the network
operator whether the voltage can be adapted at the feed-in point or
whether it would be acceptable to change the threshold of the
ACVtgRPro / Voltage increase protection parameter. If the mains
voltage is permanently within the permissible range and this message
is still displayed, contact the SMA Service Line.
Bfr-Srr Internal measurement comparison fault or hardware defect.
Corrective measures:
Contact the SMA Service Line if this disturbance occurs frequently.
Check PE PE is not connected.
Corrective measures:
Ensure that the AC cable is connected correctly (see Section6.3.2
"Connecting the Inverter to the Electricity Grid", page27).
If the AC cable is connected correctly and this message is still
displayed, contact the SMA Service Line.
Derating The inverter reduces its power output due to overheating.
Corrective measures:
Ensure sufficient ventilation.
Fault Curr Meas Deviation in the differential current measurement. If this message is
displayed frequently, permanent shutdown will be triggered.
Corrective measures:
Contact the SMA Service Line.
dI
dI-Srr
The inverter has detected a change in the differential current. A change in
the differential current can be caused by an earth fault, residual current or
malfunction. The inverter disconnects from the electricity grid.
Corrective measures:
If none of the above causes apply and this message is still displayed,
ensure that the PV plant is properly insulated and that there is no earth
fault present (see Section10.5.1 "Checking the PV Array for Earth
Faults", page54).
Message Description and Corrective Measures
48


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