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Annexe
Supplement for RSI inverter
Description of trigger voltage/open-circuit voltage
To prevent the inverter from restarting repeatedly when sunlight is
insufficient, the parameter value Prm. 2 can be modified to set the
auto trigger voltage of the inverter. In full-auto mode, when the
open-circuit voltage of the PV array is higher than the trigger vol-
tage of the inverter, the inverter will start automatically and adjust
the output frequency automatically based on sunlight intensity
(MPPT control).
We recommend to modify parameter value Prm. 2 based on the
open-circuit voltage of the PV array according to the actual confi-
guration of the pumping system.
When the inverter is started, the auto-trigger voltage value is
90 % of the open-circuit voltage, which means that when the vol-
tage of the PV array exceeds 90 % of the open-circuit voltage, the
inverter works automatically.
If the startup fails due to insufficient sunlight, the trigger voltage
will increase accordingly, but not higher than to 95 % of the open-
circuit voltage value. This is to prevent damage to the pump if the
system restarts repeatedly when sunlight is insufficient.
In practice, we recommend to set parameter value Prm. 2 to the
actual, measured open-circuit voltage of the PV array as V
be influenced by temperature.
Description of startup delay time
When sunlight is insufficient or a system error occurs, parameter
value Prm. 5 can be modified to set the startup delay time of the
inverter to prevent the pumping system from restarting repeate-
dly. The default delay time is 120 seconds.
In full-auto mode, when the fault disappears, the inverter will res-
tart and adjust the output frequency automatically based on the
sunlight intensity to implement the MPPT control. The client can
set parameter value Prm. 5. to refer to the application system
accordingly.
When the inverter is started, the startup delay time is the set
value of Prm. 5. In full-auto mode, if startup fails due to insuffi-
cient sunlight, the delay time will increase by the set value of
Prm. 5 each time, but no more than five times. This is to prevent
damage to the pump due to repeated system restarts when sun-
light is insufficient. When the pumping system has been running
steadily for more than 6 minutes, the startup delay time will auto-
matically return to the set value of Prm. 5. In manual mode and
semi-automatic mode, the delay time is always the set value of
Prm. 5 as every startup requires a manual action.
Description of working modes
The working mode of the inverter can be changed by modifying
the parameter value Prm. 11.
0: Manual mode:
•
Press
to start up the inverter; the operating frequency of
RUN
the inverter is determined by Prm. 12.
•
Press
to stop the inverter.
STOP
1: Full-auto mode:
•
is locked. Only when the voltage of the PV array reaches
RUN
the trigger voltage value, will the inverter start working auto-
matically.
•
When the inverter starts working, the operating frequency is
adjusted according to the sunlight intensity; press
the inverter.
2: Semi-automatic mode:
•
When the voltage of the PV array reaches the trigger voltage
value, press
RUN
the PV array is lower than the trigger voltage value,
locked.
can
oc
•
When the inverter starts working, the operating frequency is
adjusted automatically by sunlight intensity; press
the inverter.
to start up the inverter. When the voltage of
1
to stop
STOP
will be
RUN
to stop
STOP
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