SMA SUNNY BOY - Manual (Page 34)

Measurement Channels and Messages SMA Solar Technology AG
34 SB_SMC-BEN092840 User Manual
dI-Bfr
dI-Srr The inverter has detected a drastic change in the differential current. This
fault only occurs in transformerless inverters that have no galvanic
isolation from the grid. The integrated differential current monitoring
system plays an important part in ensuring personal safety.
A drastic change in the differential current can be caused by a sudden
grounding fault, residual current or an actual fault in the device. The
inverter disconnects from the grid.
Corrective measures
• If the message „dI-Bfr“ or „dI-Srr“ appears for no obvious reason,
please contact your installer to verify whether the plant insulation
might have a ground fault, as described in the inverter installation
guide.
dI-Mess-Srr
Fault Curr Meas Deviation in the differential current measurement / differential current
Corrective measures
• If this fault message is displayed repeatedly, it means that inverter
operation is permanently disabled. If the inverter is equipped with
a communication interface, the installer can try to rectify the fault
with the help of a communication product.
• Should this be unsuccessful, please contact the SMA Solar
Technology Serviceline.
dI-Test Error in differential current measurement.
Corrective measures
• Please contact your installer or the SMA Solar Technology
Serviceline if this problem recurs.
dZac-Bfr
dZac-Srr Sudden changes in grid impedance exceed the permissible range ("Bfr"
or "Srr" are internal messages which are of no relevance for the user).
For safety reasons, the inverter disconnects itself from the grid.
Corrective measures
• Have your installer check the grid frequency and the incidence of
major fluctuations. If repeated frequency variations occur and this
is causing „dZac-Bfr“ or „dZac-Srr" errors, your installer should ask
the utility operator to agree to a modification of the operating
parameters (dZac-Max).
• The installer is responsible for changing the suggested parameters
and making the necessary arrangements with the SMA Solar
Technology Serviceline.
Message Description and corrective measure