User manual

6 Self test

The self test is mandatory for operation of inverters in Italy.

Function

The prerequisites for performing the self test are as follows:

n The country Italy was selected during initial commissioning.

n The level of solar irradiation is high enough to ensure that the inverter can feed the grid.

During the self test, the inverter checks its switch-off behaviour with regard to too high / too low

grid voltage and frequency (7 test phases, duration of approx. 40 minutes). The following applies:

n In each phase of the self test, the inverter changes its switch-off threshold, step-by-step

upwards/downwards from the set lower/upper limit values.

n When the switch-off threshold reaches the actual grid voltage/frequency then the inverter

stores this information.

n The data is shown on the display as follows:

– The current values of the first test phase are displayed first; see the following illustration.

– The values of the subsequent test phases are added below (initially hidden).

– If the self test succeeded then the message Self test passed is added below. The mes-

sage must be displayed and confirmed.

n If the self test conditions are not satisfied, one of the

Messages of errors that prevent the

self test from running, p. 71is displayed.

n If a measurement lies outside the required tolerance during the self test then the self test is

cancelled and the inverter displays the message Self test failed. The inverter remains dis-

connected from the grid (relay open, no feeding) until the self test is passed successfully.

Note

To see the results of the self test saved in the inverter, press Information

⇒

Self test.

①

Lower / upper limit value according to the country setting

②

Measured actual grid voltage / frequency

③

Switch-off threshold (changed in steps)

④

Switch-off time

time between following events:

n Switch-off threshold reaches the actual grid voltage / frequency

n The inverter disconnects itself from the grid

747.431 | Z09.3 | 2017-09-05