Precautions When Selecting a Frequency Converter for Submersible Pumps

1. Since the load of the submersible pump is heavier than that of the ordinary pump, the rated current of the supporting motor is relatively large. Therefore, the selection of the inverter should be based on the rated current of the motor compared to the rated current of the inverter, not just power matching;

1. Pay attention to the installation and use environment, and protect the inverter for installation in relatively humid places such as pumping stations. For example, strengthen the treatment of the insulating protective paint of the PCB circuit board, the protective treatment of the screw sheet metal parts, etc., and place it in the control box for use.

1. The depth of the submersible pump is generally about 100 meters, and the distance between the inverter and the pump is relatively long. Therefore, in the process of use, it is necessary to consider thickening the cable diameter to reduce the line loss, select the output reactor to reduce the line leakage current, and appropriately increase the selection of the inverter to compensate for the power attenuation. In particular, the type of non-clean water pump containing impurities should be increased, and the no-load current in the water is not large.

1. The equipment is regularly inspected and maintained. For the pump set, it is necessary to check whether the appearance is aging, whether the seal is leaking, and conduct an insulation measurement. The inverter should also be checked and cleaned regularly to ensure that it can work well. For occasions that require no discontinuous use, a backup emergency control circuit should be prepared to prevent the inverter from being shut down due to a condition.

1. Good grounding is the basis for the stable and reliable operation of the inverter. If there is no reliable grounding on site, it can be considered that the inverter is not grounded. It is strictly forbidden to use the neutral ground to connect the neutral wire as the ground wire to the ground terminal of the inverter. It is also not allowed to use the ground of the motor and the ground of the inverter together.

1. In order to be safe, the leakage protection switch is used on many occasions in rural areas. If the leakage protection selection is improperly adjusted, it will trip due to the influence of the leakage current of the inverter. At this time, it can be considered to install a reactor at the input end or reduce the carrier frequency, and if possible, consider adding an output reactor to reduce the harmonic current.

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