Qualified person
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.
Requirements:
Procedure:
The message Avvio Autotest is not shown in the display?
The ten seconds have elapsed so the self-test cannot start.
The information Autotest interroto is shown in the display?
The self-test was cancelled due to an unexpected disconnection condition or the DC voltage is too low to continue grid feed-in.
- Name of the test: Autotest (59.S1) 240.00V
- Disconnection value: Valore di soglia con 230.00V
- Normative value: Va. taratura 253.00V
- Disconnection time: Tempo die intervento 0.02 s
- Current grid voltage: Tensione di rete Val.eff.: 229.80V
