ABB UNO-DM-3.3-TL-PLUS Product Manual page 143

5. Remote ON/OFF
This section of the menu is used to enable/disable connection/discon-
nection of the inverter from the grid using the special control signal (R+)
for inverter equipped with UNO-DM-COM KIT (-X models) or UNO-DM-
PLUS-COM ETHERNET KIT (-E models).
• Disabled: the connection/disconnection of the inverter to/from the grid
is dictated by the input (voltage from the photovoltaic generator) and
output (grid voltage) parameters of the inverter.
• Enable: connection/disconnection of the inverter from the grid is dic-
tated (as well as by the inverter input - voltage from the photovoltaic
generator - and output parameters - grid voltage) by the state of the
signal R+ with respect to the signal RTN.
6. MPPT Scan
This section of the menu allows you to set the parameters of the max-
imum 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.
• E/D MPPT Scan: Enables/disables the scan for identifying the max-
imum power point of the system.
• Scan Interval: This section 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. Power Limit.
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 nom-
inal 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