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SMA Solar Technology AG
Troubleshooting/Problem Solving
Technical Description
SBU2200-TEN083320
157
21.8 Troubleshooting
Answers are provided below for faults that may occur in practice:
1. Approval
The grid operator refuses to allow connection of the system to the grid due to concern that
this would enable feeding of arbitrary current back through the feed-in counter. Is this
legitimate?
No, if all system components are connected correctly, only energy which is fed in at connection X2 /
PV System can be forwarded to the output X1 / PV Meter. The software prevents the Sunny Backup
2200 from establishing a connection to the PV feed-in counter. This is confirmed by a certificate from
the German Professional Association for Precision Engineering and Electrotechnology (BGFE), which
you can acquire from SMA, and present to the grid operator.
2. Installation / Commissioning
Why am I prohibited from installing an RCD switch upstream of the Sunny Backup system?
Because the RCD switch has a protective function (voltage disconnection in the event of a fault) which
is rendered ineffective by the Sunny Backup system. In order to preserve this protective function, the
RCD switch must be positioned between the Automatic Switch Box S and the loads.
F743
3
internal device communication BFR-DSP missing
W753
1
invalid date (date is automatically started during startup)
F754
2
communication with Automatic Switch Box S interrupted
W755
1
battery preservation mode 1
W756
1
battery preservation mode 2
W757
1
battery preservation mode 3
F758
4
short circuit or cable break on temperature sensor/inverter
F762
4
short-circuit or cable break on temperature sensor/voltage converter
W766
1
communication with Automatic Switch Box S interrupted
W770
1
short circuit at the 24 V DC output
F771
4
voltage monitoring algorithm error
Category BOX
F801
4
plausibility test failed (relay error)
W819
1
Communication errors
W820
1
incorrect box type (Automatic Switch Box)
W821
1
PV system not available for grid feeding
W822
1
PV system not available in the stand-alone grid
W823
1
error detected on the QUPS-Box – enable signal for plausibility test, power supply
Displ.
no.
Level
Description