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Identificazione: MD-AL-GI-00
Rev. 4.0 del 31.01.18 - Applicazione: GID
Manual of 07/06/2019 Rev. 1.1 “User Manual for 20K-33KTL”
again,” press the “Back” key and enter the password again. When the password has been entered correctly,
you can enter the menu. Now you can use the “Up” and “Down” keys to select the “1.Enable” or “2.Disable”
option and select it with the “OK” key. If the option “1.Enable” is selected, the function for checking the
ground line will be executed and the inverter will not start producing power if the grounding line is not
present and properly connected; this setting is active by default on all three-phase inverters. If option
“2.Disable” is selected, the inverter will start operating and it will produce power even without the ground
connection line. If the setting is successful, “OK” will be displayed; otherwise, “Error” will be displayed.
P(grid) Check
Select “20. P(grid) Check” and press “OK” to enter the relative menu, from which you can enable the “Reflux
Power” function, i.e. the possibility to set the maximum power fed into the grid. The display will show “Enter
PWD!”, press “OK” to enter the password. Enter the password “0001” using the “Up” and “Down” keys to
select the number and “OK” to move to the next one, and confirm. If the display shows “Incorrect, try again,”
press the “Back” key and enter the password again. When the password has been entered correctly, you can
enter the menu. With the “Up” and “Down” keys you can set the “1. Enable” and “2. Disable” option, and
select it with the “OK” key. In this way the inverter can feed a maximum power of between 0 kW and the
rated power of the inverter into the national grid, based on the solar radiation available and the domestic
consumption. If the setting is successful, “OK” will be displayed; otherwise, “Error” will be displayed.
Note:
To activate the Reflux Power mode in three-phase inverters, it is necessary to install the Anti Reverse
Power Controller and three CT sensors, as described in the appropriate procedure. This device can be
purchased from suppliers of photovoltaic materials.
The size of the inverter and power value you wish to feed into the grid must be specified at the time of
purchase.
MPPT Scan
Select “21. MPPT Scan” and press “OK” to enter the relative menu, from which you can enable the “MPPT
Scan” function, i.e. the possibility to set the periodic search for the Maximum Power Point. Enter the
password “0001” using the “Up” and “Down” keys to select the number and “OK” to move to the next one,
and confirm. If the display shows “Incorrect, try again,” press the “Back” key and enter the password again.
When the password has been entered correctly, you can enter the menu. Use the “Up” and “Down” keys to
choose between the items “Set Scan Paras” and “Scan Test”. For each of the two items, you can use the “Up”
and “Down” keys to set the “1. Enable” and “2. Disable” option, and then select it with the “OK” key. Entering
the first menu, if the option “1.Enable” is selected, you will be able to select the “Scan Freq” i.e. the time
interval in which the new MPPT will be searched (the time is expressed in ** min); with this function, the
photovoltaic production will be reset every ** minutes and will return to the current maximum power point.
If the setting is successful, “OK” will be displayed; otherwise, “Error” will be displayed. The second item
“Scan Test” allows performing an instant test to search for the current MPPT so that the inverter moves to
the condition of maximum power.
This function can be used if the shading on the panels is extensive, thus reducing their efficiency and
productivity. Under optimal conditions, however, this function is not recommended, as it would limit the
productivity of the inverter.
P(f) Setting
Select “22. Set P(f)” and press “OK” to enter the relative menu, from which you can change the active power
according to the grid frequency required by the local regulations. This function may be required by various
regulations for grid-connected inverters. Use the “Up”, “Down” and “OK” keys to set the time delay expressed
in seconds (*.***s) before the changed P active power will intervene.
