SI21 Solar Pump VFD Manual
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F21.23(minimum power protection value), and after F21.24 (minimum power protection detection time) time,
enters into standby protection state, while the keyboard warning “A.LPr”; after entering into the standby protection
state and after F21.25 (minimum power automatic recovery)time, automatically resume to running state.
6) Full Water Protection
Detect the water full alarm and low water level through two X terminals, realizing automatic level control.
Wherein F21.27 is the water overfill protection detection time and F21.28 is full water protection exit time, and X 3
terminal is defined as full solar water detection alarm, and X4 terminal is defined as full solar water detection alarm
reset, the warning signal is shown as “A.Ful”.
7) Alarm Recovery Mode: 0: automatic recovery; 1: manual recovery
This option is for low frequency protection, dry protection, over-current protection, minimum power function;
you can select the alarm restoration by F21.26. When you select 0 for automatic recovery, during fault warning
displaying, you can also press the “RESET” button to stop operation; during fault warning displaying, you can
press the “RESET” button to manually clear, you can also press “RESET” button to achieve stop operation.
8) PQ Curve Function
This model provides a self-defined PQ curve for users to set up five groups of PQ corresponding points
according to the pump cases, to achieve real-time traffic speed, daily flow, cumulative flow, generating capacity,
cumulative electricity consumption; of which by default, daily flow and generating capacity are calculated based on
7h in a day.
9) Status Check
When the photovoltaic pump is running, you can check F21.01 to confirm the current operating status.
