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Self-test in accordance with CEI0-21 during commissioning (applies to Italy only)
The Italian standard prescribes that an inverter can only be operated on the utility grid after
the disconnection times for overvoltage, undervoltage, minimum frequency and maximum
frequency have been checked.
If the country data set is configured to CEI 0-21Int / CEI0-21internal, start the self-test
as soon as the display shows the country data set (see Section7.5.1 "Starting the Self-
Test", page35).
The green LED is glowing and the display alternates automatically between the device type,
firmware version, the serial number or designation of the inverter, the NetID, the configured
country data set and the display language.
The green LED is flashing?
Possible cause of error: the DC input voltage is still too low or the inverter is monitoring the
utility grid.
Once the DC input voltage is sufficiently high and the grid-connection conditions are met,
the inverter will start operation.
The red LED is glowing and an error message and event number appear in the display?
An error has occurred.
Rectify the error (see service manual at www.SMA-Solar.com).
7.5 Self-Test in Accordance with CEI 0-21 for PV Systems
≤6kW
7.5.1 Starting the Self-Test
The self-test only applies to inverters that are configured with the country data set
CEI 0-21 Int or CEI 0-21 internal.
The self-test is only valid for inverters licensed for Italy and configured with the country data set
CEI 0-21 Int or CEI 0-21 internal.
If the inverter is configured to the country data set CEI 0-21Ext or CEI0-21external, no
self-test is required.
The self-test is only required for inverters to be commissioned in Italy. The Italian standard requires
that all inverters feeding into the utility grid are equipped with a self-test function in accordance with
CEI0-21. During the self-test, the inverter will consecutively check the reaction times for
overvoltage, undervoltage, maximum frequency and minimum frequency.
The self-test changes the upper and lower disconnection values for each protective function on a
linear basis for frequency monitoring and voltage monitoring. As soon as the measured value
exceeds the permitted disconnection threshold, the inverter disconnects from the utility grid. In this
way, the inverter determines the reaction time and checks itself.
After the self-test has been completed, the inverter automatically switches back to feed-in operation,
resets the original disconnection conditions and connects to the utility grid. The test takes
approximately threeminutes.
7 Commissioning
SMA Solar Technology AG
Operating Manual 35SB30-50TL-21-BE-en-11
35


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