ABB UNO-2.0-TL-OUTD - Page 88

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7 - Operation
1. Vstart
This section of the menu is used to set the Vstart activation voltage to
adapt it to the needs of the system. This voltage imposes a minimum
input voltage on the inverter above which connection to the grid will be
attempted.
For the single stage inverters (UNO-3.6/4.2-TL-OUTD) the activation
voltage (Vstart) does not only depend on the input voltage value from the
PV generator but also from the output voltage value. In fact, the activa-
tion voltage cannot be set to a value below the rectied value of the grid
voltage which is calculated as Vgrid x 1.414.
Example: Vstart = 300Vdc Vgrid = 230Vac
Actual Vstart = (230 x 1.414) + 30V = 325 + 30 =355Vdc
(The 30Vdc added to the rectied value of the grid voltage is a safety margin to prevent the
operation at the limit of the inverter). For lower input voltage values, the message "waiting
sun" will appear on the display.
We advise changing the activation voltage only if really necessary and to set it to the cor-
rect value: the photovoltaic generator sizing tool available on the ABB website will indicate
whether Vstart needs changing and what value to set it to.
2. Input UV Delay
This section of the menu allows you to set the time for which the inverter
stays connected to the grid after the input voltage has dropped below the
Under Voltage limit (set at 70% of Vstart).
For the single stage inverters (UNO-3.6/4.2-TL-OUTD) the check is car-
ried out on the input current rather than on the input voltage (when the
input current becomes negative, the Input UV Delay count starts).
This value can be set from 1 to 3600 seconds (60 seconds as the default
setting).
Example: Having set the Input UV Delay to 60 seconds, if voltage Vin drops below 70%
of Vstart (UNO-2.0/3.0-TL-OUTD) or the input current becomes negative (UNO-3.6/4.2-TL-
OUTD) at 9:00, the inverter stays connected to the grid (taking power from it) until 9:01.
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