Self Test - Steca Grid 8000 Bedienungsanleitung

10

Self test

The self test is mandatory for operation of inverters in Italy.
Function
The prerequisites for performing the self test are as follows:
• The country Italy was selected during initial commissioning.
• 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 (4 test phases, duration of approx. 2 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. 14.
– 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
cancelled and the inverter displays the status message Self test failed. The inverter remains
disconnected 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.
Fig. 14: Self test – display of the test results
Operation
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√ The country Italy is set in the inverter to be tested.
1. Check the country setting via Information/System
2. Select Self test in the main menu. The dialog shown
3. Press and hold SET for 1 second. The self test starts.
4. The values for the first test phase are displayed (fig.
5. Press  to display the values for the subsequent test
6. Only when Self test failed is displayed:
Note
If Self test failed is displayed then repeat the self test
as soon as possible so that the inverter can resume feeding.
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 the following events:
Switch-off threshold reaches the actual grid voltage/
–
frequency
The inverter disconnects itself from the grid
–
info in the main menu as required.
at the left is displayed.
left).
phases (if available).
Press SET to confirm the status message. The status
display appears.
EN
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