7 Initial Start-Up SMA Solar Technology AG
40 SB13_21TL-IA-en-65 Installation Manual
7.5 For Italy Only: Starting the Self-test
The self-test only applies to inverters which are commissioned in Italy.
The Italian standard requires that all inverters 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. Thus, the
inverter determines the reaction time up to disconnection and performs the self-test.
After the self-test has been completed, the inverter automatically switches back to feed-in operation,
resets the original calibration values and connects to the electricity grid. The test takes approx.
3 minutes.
Requirements:
☐ Configured country data set: CEI0-21 Int / CEI 0-21 Intern or amended country data set
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.
Procedure:
1. As soon as the configured country data set appears in the display, tap the display once within
ten seconds.
☑ A message informing you that the self-test has started is shown in the display:
Avvio Autotest.
✖No message Avvio Autotest shown in the display
You have exceeded the ten-second time limit so the self-test cannot start.
• Restart the self-test
• Tap the display within 20 seconds and enter the test results in 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.
Example: Display messages for overvoltage test
• Name of the test: Autotest (59.S1) 240.00V
• Disconnection value: Valore di soglia con 230,00 V
•Normative value: Va. taratura 253.00V
• Disconnection time: Tempo intervento 0.02s
• Current mains voltage: Tensione di rete Val.eff.: 229.80V
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