SI21 Solar Pump VFD Manual
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Chapter 6 Operation Guidance
6.1 Asynchronous Motor Pump Drive Operation Guidance
1) Wiring
a. Confirmed the solar pump drive if matching with motor.
b. Correctly connecting “+”“-” of solar panel to R, T wiring terminals. Otherwise it will cause VFD damage.
c. Connect motor wire and ground wire to corresponding U, V, W, E terminals.
2) Parameters setting and trial run
a. Set F01.00 to 0, F01.02 for 0, and F01.22, F01.23 parameters setting according to application site.
b. Set motor(pump) parameters according to nameplate of pump.
c. Set solar pump MPPT mode F21.00 for 1 or 2.
d. Press FWD button for trail running, and confirm the motor running direction.
3) Common problems
a. Q:Well-lit conditions, the pump is running, but the water is very small.
A:Check if the pump motor direction is reversed.
b. Q:Well-lit conditions, the drive is in standby mode 0.00Hz.
A:Check F21.01, observe what protection status is the drive in currently, check whether the parameters set is
reasonable.
c. Q:DC current is incorrectly displayed.
A:Adjust F21.30, F21.31 for calibration.
d. Q:Well-lit conditions, frequency severe beating during operation.
A:Reasonably adjust F21.06 value, the adjustment is recommended to be in the vicinity of the default, too big or
too small will cause frequency oscillation.
6.2 Synchronous Motor Pump Drive Operation Guidance
1) Wiring
a. Confirm if the solar pump drive matches with the motor.
b. Connecting “+”“-” of solar panel to R, T wiring terminals. Otherwise it will cause VFD damage.
c. Connect motor wire and ground wire to corresponding U, V, W, E terminals.
2) Parameters setting and trial run
a. Set F01.00 to 0, F01.02 for 0, and F01.22, F01.23 can be set according to demand.
b. Set motor (pump) parameters according to nameplate of pump. Then Set F02.07 for 1, the keypad will show
T-00, press START to start motor auto tuning. This process takes about three minutes.
Note: 1. If you can disconnect the motor and load, self-learning would be better.
2. The self-learning need to be done with enough sunshine and when the solar panels can provide enough
energy.
c. Set solar pump MPPT mode F21.00 for 1 or 2.
d. Press FWD button for trail running, and confirm the motor running direction.
