Steca StecaGrid 3000 - Self test; Function; Operation

70
742.221 | 12.04
EN
10 Self test
The self test is mandatory for operation in Italy.
Function
A prerequisite for performing the self test is that the country Italy has been set.
During the self test the inverter checks its switch-off behaviour with regard to too high / too low
grid voltage and frequency (4 test phases, duration of approx. 8 minutes). The following applies:
• 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.
• When the switch-off threshold reaches the actual grid voltage/frequency then the inverter stores
this information.
• The data is shown on the display as follows:
– The current values of the first test phase are displayed first; see Fig. 10.
– The values of the subsequent test phases are added below (initially hidden).
– If the self test succeeded then the status message Self test passed is added below. The
status message must be displayed and confirmed.
• If the self test conditions are not satisfied, one of the status messages listed in Tab. 9 is displayed.
• If a measurement lies outside the required tolerance during the self test then the self test is can-
celled and the inverter displays the status message Self test failed. The inverter disconnects
itself from the grid (relay open, no feeding), until the self test is passed successfully.
Note
The data stored in the inverter can be read using a PC and the InverterSelftestProtocol software.
More information on this is provided in the StecaGrid Service_InverterSelftestProtocol manual and
at www.stecasolar.com  PV grid connected  Software.
1
2
3
4

Upper/lower limit value according to the country setting

Measured actual grid voltage/frequency

Switch-off threshold (changed in steps)

Switch-off time = time between following events:
• The switch-off threshold reaches the actual grid volt-
age/frequency
• The inverter disconnects itself from the grid
Fig. 10: Self test – display of the test results
Operation
√ The country Italy is set in the inverter to be tested.
1. If necessary, check the country setting via Informa-
tion/System information.
2. Select Self test in the main menu. The dialog shown
at the left is displayed.
3. Press and hold SET for 1 second. The self test starts.
4. The values for the first test phase are displayed (Fig.
left).
5. Press  to display the values for the subsequent test
phases (if available).
6. Only when Self test failed is displayed: Press SET
to confirm the status message. The status display ap-
pears.
Note
If Self test failed is displayed, repeat the self test
as soon as possible so that the inverter can resume
feeding.