ABB UNO-DM-2.0-TL-PLUS Manual page 117

6. Multiple Max Scan Period
This settings allows you to set the time between scans. Remember that
the shorter the scan interval the greater the loss of production, due to
the fact that energy is transferred to the grid during the scan but not at
the maximum power point. Each scan takes roughly 2 seconds..
7. MPPT Noise amplitude (Only visible and editable with Admin Plus
privileges)
By changing this settings you can choose the amplitude of the DC per-
turbation introduced to establish the optimal operating point.
Setup AC Side (Only visible and editable with Admin Plus
privileges)
In the Setup AC Side sub-menu you can setup the parameter related
to the Output AC side:
Changing the above-mentioned parameters may prevent disconnection from the grid if the
new values exceed those given in the standards of the country of installation. If these parame-
ters are changed to values outside the standard range, an interface protection must be instal-
led external to the inverter in accordance with the requirements of the country of installation.
1. Grid Protection
By editing these settings it's possible to enable/disable and change the
grid protection intervention thresholds parameters.
2. Grid Connection
By editing these settings it's possible to change the grid connection
thresholds parameters to which the inverter have to connect to the grid.
3. High Frequency Derating
By setting these parameters it's possible to change the output derating
behavior of the inverter related to the grid frequency parameters.
4. Setup Average Vgrid Derating
By setting these parameters it's possible to change the output derating
behavior of the inverter related to the average voltage parameters of
the grid.
Ground Fault Interface
In the Ground Fault Interface sub-menu you can setup the parameter
related to the Ground Fault Interface:
1. Minimum Riso (read only)
These read only field shown the measure of the insulation resistance of
the PV generator comparedto ground.
2. Minimum time for Riso check
By editing this settings it's possible to change the necessary time for
checking the Riso value.
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7 - Operation