Fault LED (red) Status Explanation LED
OS (operating status) – The fault relay releases again. Off
– The device feeds back into the grid again after a country-
specific time period.
11.7 Troubleshooting
The following table lists the possible status and fault messages, the ProLog© status messages that the device
can display by means of the LC display / web interface and the LEDs.
No. Grid
LED
LED Display Status description Action Pers
.
1 Waiting for feed-in The start voltage (pre-)set in the device is
higher than the actual voltage. The device
waits for the solar voltage to exceed an ad-
justable value and for a stable grid.
Check whether the
start voltage was
set too high in the
menu.
B
2 Insufficient generator
voltage / insufficient battery
voltage
Insufficient generator voltage and power,
status before the transition to night shutdown.
Insufficient DC
voltage or voltage
fails under load (in-
sufficient DC power)
a) Compare the
voltage measured
with the no-load
voltage expected. b)
Check if the DC isol-
ator switch is
switched off c)
Check whether a D
B
3 Constant volt. control No MPP control occurs. When feed-in begins,
a constant generator voltage is fed in (85% of
the measured open circuit voltage) for a short
period
a) Does this status
appear in the morn-
ing and evening
when sunlight con-
ditions are poor? b)
Does this status ap-
pear when sunlight
conditions are
good? Please check
the constant voltage
control settings in
the menu. Internal
note: The device
password is re-
quired to alter these
settings
-
4 Yield counter for daily and
annual yields are displayed
In cases of sufficient sunlight, the unit feeds
into the grid with MPP control so as to maxim-
ise yields.
- B
11 | Maintenance and troubleshooting Manual
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