First, because the load of submersible pump is more heavy relative to the general pump, supporting the motor rated current is relatively large. Therefore, the choice of inverter to the motor rated current according to inverter rated current to be selected, not just just power matching;
Second, pay attention to the installation and environment, for the installation of the pump station and other relatively wet site to do the protection of the inverter. For example, to strengthen the PCB circuit board insulation protective paint processing, screw sheet metal parts of the protective treatment, and place the control box to use.
Third, the general depth of submersible pumps in about 100 meters, the inverter to pump the distance between the far. Therefore, in the course of the cable diameter to consider thickening to reduce line losses, matching output line reactor to reduce leakage current, the appropriate increase in inverter selection to compensate for power attenuation. In particular, non-clean pump impurity should be increased selection, not in the water load current is great.
Fourth, regular inspection and maintenance, the pump group to see whether the appearance of aging, sealing for leakage, for insulation measurement. The frequency changer also must carry on the regular inspection, the clean-up, guaranteed that can the good work. For, require no interruption of the occasion to make use of standby emergency control circuit to prevent the inverter status and cause downtime.
Fifth, good grounding is the foundation to stablly and reliablly operate, do not have a reliable ground in the case of the inverter can be considered not grounded. Do not use the ground as a ground wire to the ground terminal of the inverter. Do not connect the ground of the motor to the ground of the inverter.
Sixth, in order to safety, in many occasions in rural areas are using the leakage protection switch, if the leakage protection selection improper adjustment by the inverter leakage current will trip the phenomenon. At this point, you can consider the installation of the reactor or reduce the input carrier frequency, conditional considerations to install the output reactance, reduce harmonic current.