SMA Solar Technology AG 7 Commissioning
Installation Manual SB30-50TL-21-IA-en-21 59
7.3 Only for Italy: Self-Test in Accordance with CEI 0-21 for
PV Plants ≤ 6 kW
7.3.1 Starting the Self-Test
The Italian standard requires that all inverters in plants ≤ 6 kW feeding into the electricity grid
perform a self-test 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.
During the self-test, the upper and lower trip-limit values for each protective function are changed on
a linear basis for frequency monitoring and voltage monitoring. As soon as the measured value
exceeds the permitted trip-limit value, the inverter disconnects from the electricity grid. In this way, the
inverter determines the reaction time and checks itself.
After completion of the self-test, the inverter automatically switches back to feed-in operation, resets
to the original shutdown conditions and connects to the electricity grid.
Requirements:
• Country data set must be configured to CEI0-21 Int / CEI 0-21 intern.
or
• Country data set must be configured to trimmed / Special setting based on
CEI0-21 Int / CEI 0-21 intern.
• A report for entering the test results in compliance with CEI 0-21 must be on hand.
• The inverter must be in operation and in the start-up phase.
1. As soon as the configured country data set appears in the display, tap once on the display
within ten seconds.
☑ A message informing you that the self-test has started is shown in the display:
Avvio Autotest.
✖ The message Avvio Autotest is not shown in the display?
You exceeded the 10-second time limit so the self-test cannot start.
• Restart the self-test (see Section 7.3.3).
The self-test only applies to inverters that are configured with the country data set
CEI0-21 Int / CEI 0-21 intern.
The self-test is only valid for inverters licensed for Italy and configured with the country data set
CEI0-21 Int / CEI 0-21 intern.
If the inverter is configured to CEI0-21 Ext / CEI 0-21 extern, no self-test is required.
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