1. The load of submersible pump is heavier than that of ordinary pump, and the rated current of matching motor is relatively large. Therefore, the selection of frequency converter should be based on the motor rated current and the rated current of frequency converter to compare, not just power matching;

Second, pay attention to the installation and use of the environment, for the installation of pumping stations and other relatively humid places to do a good job of inverter protection. For example, strengthen PCB board insulation protection paint treatment, screw sheet metal parts protection treatment, and placed in the control box for use.

Submersible pump water depth in general about 100 meters, the distance between the inverter and the pump is far. Therefore, in the process of use, it is necessary to increase the diameter of the cable to reduce the line loss, select a matching output reactor to reduce the line loss current, and appropriately increase the selection of frequency converter to make up for the power attenuation. In particular, impurity containing non - clean water pump should be increased selection, can not be used in the case of a large flow of water.

4. The equipment shall be checked and maintained regularly to check whether the appearance of the submersible pump group is aging, whether the seal is leaking and insulation measurement. Frequency converters should also be regularly checked and cleaned to ensure that they work properly. In the case of uninterrupted use, backup of the emergency control loop should be done in case the inverter is shut down.

Good grounding is the foundation of stable and reliable operation of inverter. The submersible pump inverter can be considered ungrounded if there is no reliable grounding in the field. Do not use ground zero as a public connection and connect it to the ground terminal of the converter. It is also not allowed to connect the motor grounding with the inverter grounding.

Vi. For the safety of rural areas, leakage protection switch is used on many occasions. If the submersible pump leakage protection is not chosen properly, the submersible pump will appear leakage current trip of the converter. At this point, consider adding a reactor to the input or reducing the carrier frequency, and if possible, increasing the output reactance to reduce the harmonic current.