ABB UNO-2.0-I-OUTD Product Manual page 78

14. MPPT
This section of the menu allows you to set the parameters of the maxi-
mum power point tracking (MPPT) function. This function is useful when
there are areas of shade on the PV generator, which may create several
points of maximum power on the operating curve.
• MPPT Amplitude: by setting this parameter you can choose the ampli-
tude of the DC perturbation introduced to establish the optimal operating
point. There are 3 settings to choose from (LOW, MEDIUM, HIGH). The
default setting is MEDIUM.
• Multi-max scan: by setting this parameter, you can enable/disable the
scan, decide the frequency with which the scan is carried out and over-
ride it manually.
Enable/Disable: Enables/disables the scan for identifying the maximum
power point of the system.
• Scan Interval: this allows you to set the time between scans. It should be
borne in mind that the shorter the scan interval the greater the loss of pro-
duction, 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.
• Manual Scan: this allows you to start a manual scan of the photovoltaic
generator (at a different time from the interval set in Scan Interval) in or-
der to track the maximum power point.
15. Power reduction
This section of the menu allows you to adjust the limit to the active power
that the inverter can feed into the grid by setting the percentage of nomi-
nal power at which the limit should be triggered.
Setting it to 100% resets the default maximum power, which in some
installation country standards may be 110% of nominal power.
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7 - Operation