Operation
NT 10000...NT 12000 49
Display message Description Cause and possible remedies
Solar generator fault
101:U-DC max. Your NT Solar Inverter is approved for a
maximum solar generator open-circuit
voltage of 900 V. All DC input compo-
nents are adequately dimensioned with a
safety margin. If the threshold is excee-
ded, the Solar Inverter stops feeding.
The maximum DC voltage was exceeded.
Check the dimensioning of your PV
generator.
Too many modules are connected in se-
ries.
Reduce the number of modules and
re-commission the system.
102:Insulat. Before each connection, your Solar Inver-
ter checks the PV system for a possible
earth or insulation fault. If this kind of er-
ror is detected, no feed in takes place.
The mode of operation is compliant with
DIN V VDE 0126-1-1.
The Solar Inverter has discovered an insu-
lation fault in the PV system during
run-up.
Check your PV system for possible in-
sulation faults (damaged DC cables
etc.).
The measured insulation resistance must
be at least 900 kΩ.
103:AFI>30mA
105:AFI>60mA
106:AFI150mA
Your Solar Inverter is equipped with an
AC/DC sensitive AFI according to DIN VDE
0126-1-1. The monitoring unit has detec-
ted a relative residual current increase.
A sudden residual current increase has oc-
curred during Solar Inverter operation.
Check your PV system for possible in-
sulation faults.
104:AFI>0.3A Your Solar Inverter is equipped with an
AC/DC sensitive AFI according to DIN VDE
0126-1-1. This monitoring unit has detec-
ted an absolute residual current of >300
mA.
A residual current has occurred during So-
lar Inverter operation.
Check your PV system for possible in-
sulation faults.
AC grid fault
201:Surge e. Your Solar Inverter continuously moni-
tors the quality of the AC grid. During
high voltage peaks on the phase feeding
in, the Solar Inverter stops feeding and
attempts a restart.
The Solar Inverter has detected a high
voltage peak on the phase feeding in.
After troubleshooting the Solar In-
verter restarts automatically. Should
the error occur frequently, please
contact your power supply company.
A monitoring phase and a neutral con-
ductor were interchanged during connec-
tion of the AC side.
202:UAC1>10% Your Solar Inverter continually monitors
the voltage level of the phase feeding in.
If the maximum permissible limit is excee-
ded, the Solar Inverter stops feeding and
does not start up again until the voltage
value drops below the maximum permis-
sible limit.
The cable cross-section in the AC supply
line to the Solar Inverter is too small.
Your inverter feeds into a spur line, which
is insufficiently dimensioned.
Check the design of your grid connec-
tion (energy meter) or the grid feed
point to your power supply company
(PSC).
Ask your power supply company
(PSC) about grid stability and design.
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