SMA SB 4200TL Multi-String - Manual (Page 52)

Technical Documentation SMA Technologie AG
Page 52 SB4200-12:FE4804 Operating Instructions
Imax DC Overcurrent in the intermediate DC circuit of the Sunny Boy 4200TL
Multi-String. The Sunny Boy is detecting a current exceeding the
specifications within its intermediate circuit, this is the result of a too
high current on the DC input. Have your plant configuration che-
cked.
L<->N L and N mixed up on AC connection. Have installer check installa-
tion.
Offset Grid monitoring self-test failed.
Rechner Failure in operation of one of the two microcontrollers
Relais1
Relais2
Relais3
Relais4
L-Netz/
N-WR/
N-Netz Grid connection relay self test failed. The Sunny Boy checks the re-
lays that connect the Sunny Boy to the grid before it starts feeding
to the grid. In case the grid relays do not function correctly the safe
and reliable disconnection cannot be guaranteed and the Sunny
Boy does not connect to the grid. If this failure occurs often the Sun-
ny Boy is internally set to „permanent disable“. Contact SMA in
case you observe this failure often.
Riso The electric isolation of the PV system to the ground is leaking. The
resistance between one of the poles and ground is below a defined
threshold.
Shutdown Serious failure, device shut down until next switch-on.
ROM The internal test of the Sunny Boy control system firmware failed.
Contact SMA in case you observe this failure often.
Uac-Bfr/
Uac-Srr The AC grid voltage is exceeding the permissible range („Bfr“ or
„Srr“ is an internal message and is not important for the user). Uac
can result from:
• A disconnected grid (circuit breaker, fuse)
• A disconnected AC cable
• AC cable is high-resistance
The Sunny Boy 4200TL Multi-String assumes that the public grid is
down and disconnects from the grid in order to avoid islanding.
Check the grid voltage and the grid cable connection in the Sunny
Boy enclosure. If the grid voltage is out of range due to your local
grid conditions contact the utility company and ask if it is possible
to modify the utility conditions.
If the grid voltage is within the tolerable range and you still observe
the failure message „Uac-Bfr“ or „Uac-Srr“ contact SMA.
UDiff
Uzkposneg<10 Defective DC link. Contact SMA in case you observe this failure of-
ten.
Failure Code Descripition