SMA SB 2500TL-21 Installation - Manual (Page 54)

Commissioning SMA Solar Technology AG
54 SB25-30TLST-21-IA-en-13 Installation Manual
7.3 Self-Test in Accordance with CEI 0-21 for 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.
The self-test changes the upper and lower trip-limit values for each protective function 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 the self-test has been completed, the inverter automatically switches back to feed-in operation,
resets 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).
2. Tap on the display within 20 seconds and enter the test results into the test report as they
appear.
☑ The self-test starts.
☑ The inverter displays the results of the individual tests for overvoltage, undervoltage,
maximum frequency and minimum frequency. The results are displayed three times in
succession for ten seconds each.
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.