Fault
Possible cause
Explanation/remedy
By
The grid fuse trips.
Damage to the device's
hardware.
If the grid fuse trips immediately when the device goes into
feed-in mode (after the start-up period is complete), the de-
vice’s hardware is probably damaged.
› Contact KACO Service to test the hardware.
E
The device is displaying
an impossible daily peak
value.
Faults in the grid.
The device continues to operate as normal without losses to
the yield, even when an erroneous daily peak value is dis-
played. The value is reset overnight.
› To reset the value immediately, switch the device off by dis-
connecting it from the grid and switching off the DC, then
switch it back on.
E
Daily yields do not corre-
spond to the yields on
the feed-in meter.
Tolerances of the mea-
suring elements in the
device.
The measuring elements of the device have been selected to
ensure maximum yields. Due to these tolerances, the daily
yields shown may deviate from the values on the feed-in meter
by up to 15%.
E
› No action.
Device is active but not
connected to the grid.
Generator voltage too
low; grid voltage or PV
generator voltage unsta-
ble.
The PV generator voltage or power is not sufficient for feed-in
(solar radiation is too low). The inverter checks the grid param-
eters before the feed-in process begins. The length of time it
takes to switch back on again differs from country to country,
depending on applicable standards and regulations, and may
be several minutes. The starting voltage may have been set in-
correctly.
› Adjust starting voltage in the Parameters menu if required.
E
› No action
In spite of high radiation
levels, the inverter does
not feed the maximum
power into the grid.
Particular ambient con-
ditions.
Because the temperatures inside the unit are too high, the de-
vice reduces its power to prevent damage to the device. Note
the technical data. Ensure that the convection cooling is not
impeded from the exterior. Do not cover the cooling fins.
› Ensure sufficient cooling of the device.
B
› Remove any foreign bodies that may be on the device.
B
› Clean the cooling fins
E
DC fuse defective
A generator string is disconnected from the device due to a de-
fective fuse. Establish the cause of tripping by measuring all DC
strings with a clip-on ammeter. - If there is no current flowing
in a string, then the associated DC fuse is defective.
Check the no-load voltage and layout of the PV generator. Re-
place the damaged modules if necessary.
B, E
› Replace the PV fuse with a fuse size that is of the same type.
Tab. 8:
Troubleshooting
11.7
Fault messages
Many fault signals indicate a fault in the grid. They are not operational faults of the device. The triggering levels
are defined in standards, e.g. VDE0126-1-1. The device shuts down if the values exceed or fall below the ap-
proved levels.
Fault LED (red)
Status
Explanation
LED
FS (fault status)
– The fault relay has switched.
On
– Feed-in was ended due to a fault.
OS (operating status)
– The fault relay releases again.
Off
– The device feeds back into the grid again after a country-
specific time period.
Manual
Maintenance and troubleshooting | 11
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