5 Operation
48
5.5 Malfunction displays
The Solar Inverter indicates malfunctions in the LCD
display and saves these in the internal error memory.
The malfunction display consists of a number and
a short designation. Based on the first number
you can quickly recognise which area the error has
occurred in:
1: Error in the area of the solar generator
2: Error in the area of the AC network
3: Error in the area of the inverter
4: Error in the area of the interfaces/communication
5: Warnings in the area of the interfaces/
communication
9: Service error
If an error is shown in the standard display, then you
can look up the exact error message in the menu
under «Solar Inverter – Events».
· A restart may be attempted in the event of an
error message.
· Please note the serial number of the device and
the error number before contacting the Techni-
cal Hotline.
· The Technical Hotline can be contacted on
+49 (0)7531 996 77-577 during weekdays from
7:30 am to 6:00 pm.
Display message Description Cause and possible remedies
Solar generator fault
101:U-DC max Your NT Solar Inverter is approved for
a maximum open-circuit voltage of the
solar generator of 900 V. All components
of the DC input are sufficiently dimen-
sioned with a safety factor. If the thresh-
old is exceeded, the Solar Inverter stops
feeding.
The maximum DC voltage
was exceeded.
· Check the dimensioning of your PV
generator.
Too many modules are connected in
series.
· Reduce the number of modules and
carry out commissioning again.
102:Insulat. Before each connection, your Solar
Inverter checks the PV system for a
possible earth fault or insulation faults.
Should this kind of error be detected,
no feeding takes place. The mode of
operation is conformant with DIN VDE
0126-1-1.
The Solar Inverter has discovered an
insulation fault in the PV system during
start-up.
· Check your PV system for possible
insulation faults (pinched-off DC lines
etc).
The measured insulation resistance must
be at least 900 kohms.
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