Measurement Channels and Messages
SMA Solar Technology AG
40
SB_SMC_Schueco-BEN093730
User Manual
STM-Timeout
Internal program run fault.
Corrective measures
• Please contact your installer or the SMA Solar Technology
Serviceline if this problem recurs.
Trafo-Temp-F
Temperatures in the transformer have exceeded the acceptable limit. The
inverter stops feeding the grid until the temperature reverts to within the
admissible range.
Corrective measures
• If this problem recurs, check the heat dissipation of the inverter, as
described in Section 5.1 "Checking Heat Dissipation" (page 27).
Trafo-Temp-W
Temperatures in the transformer have exceeded the acceptable limit. The
inverter stops feeding the grid until the temperature reverts to within the
admissible range. The Trafo-Temp-W warning is displayed until final shut-
down (at the end of the day).
Corrective measures
• Check the heat dissipation of the inverter, as described in Section
5.1 "Checking Heat Dissipation" (page 27).
Vac-Bfr
Vac-Srr
The grid current is no longer within the permissible range ("Bfr" or "Srr" is
an internal message that has no meaning for the user). This can be
caused by any of the following:
• Grid disconnected (line circuit breaker, fuse),
• AC cable is broken or
• AC cable is highly resistive
For safety reasons, the inverter disconnects itself from the grid.
Corrective measures
• Please contact your installer to check the grid voltage and the grid
connection at the inverter.
• If the grid voltage is outside the acceptable range due to local grid
conditions, your installer should ask the utility operator whether the
voltage can be adjusted at the feed-in point or whether they would
agree to modifications in the monitored operational limits
(operating parameters: Vac-Min and Vac-Max).
• If the grid frequency is within the tolerable range, yet "Vac-Bfr," or
"Vac-Srr" faults are still being displayed, please contact the SMA
Solar Technology Serviceline.
VDiff / UDiff
Disturbance in the intermediate circuit.
Corrective measures
• Please contact your installer or the SMA Solar Technology
Serviceline if this problem recurs.
Message
Description and corrective measure
