Compliance & Standards: "The following control methodologies for DC variable frequency submersible pumps are developed in alignment with international safety and performance benchmarks, including IEC 60335-2-41 (Safety of Pumps) and the CE Low Voltage Directive (2014/35/EU). These standards ensure that our technical approach meets the rigorous demands of industrial and residential water management systems."

In order to ensure the correct use of temperature and humidity sensitive components during patching, and to prevent patch components from being affected by moisture and humidity in the environment, anti-static packaging materials are used. The following points can be effectively managed and controlled to avoid the impact of materials due to improper management and control quality.

Environmental Regulation

The ambient temperature of the workshop where temperature and humidity sensitive components are used is 18~28℃, and the relative humidity is between 40%~60%; When storing, the relative humidity of the moisture-proof box is less than 10%, and the temperature is between 18~28℃； The material staff checks the temperature and humidity of the moisture-proof box every 4 hours, and registers its temperature and humidity values in the temperature and humidity control table; if the temperature and humidity exceed the specified range, immediately notify the relevant personnel to improve, and take corresponding remedial measures, such as drying agent, adjust the indoor temperature, or take out the components in the faulty moisture-proof box and put them into a qualified moisture-proof box. The opening time or opening time of the temperature and humidity environment space in each closed area should not exceed 5 minutes to ensure that the temperature and humidity conditions can continue to be within the control range.

Process control

a. When dismantling the vacuum packaging of humidity-sensitive components in the inverter water pump controller circuit board patch production line, you must wear an electrostatic wristband and electrostatic gloves, and open the vacuum packaging on a table with good electrostatic protection. After disassembly, check whether the humidity card changes meet the requirements (according to the label requirements on the packaging bag)。For SMD integrated circuits that meet the requirements, a humidity sensitive component control label shall be affixed to the package.

b. When the production line receives bulk humidity sensitive components, it is necessary to confirm whether the components are qualified according to the humidity sensitive component control label, and the qualified components shall be used preferentially.

c. After the humidity sensitive component is unpacked, the exposure time to the air before reflow shall not exceed the grade and life of the humidity sensitive component.

d. For the integrated circuits that need to be baked and unqualified, they will be handed over to the quality control personnel for rejection and returned to the warehouse.

control method

In our dedicated R&D lab stress tests, we specifically addressed power instability. Our data shows that when input voltage fluctuates by more than ±15%, the control system triggers a dynamic compensation logic, adjusting the PID algorithm's response time to within 100ms - 150ms. This millisecond-level adjustment effectively suppresses torque ripple, ensuring the submersible pump maintains a constant pressure output even under unstable power conditions.

a. Incoming material inspection—a desiccant bag and a relative humidity card should be attached to the moisture-proof bag, and relevant text warning signs should be affixed outside the moisture-proof bag. If the packaging is not good, it needs to be confirmed by the relevant personnel.

b. Material storage—unopened materials should be stored according to the instructions; if the unopened materials need to be returned to the warehouse for storage, they should be sealed in a moisture-proof bag after baking; if the unopened materials will not be used immediately, they should be temporarily stored in a low-temperature oven.

c. On-line operation - unpack when in use, and check and fill in the humidity indicator card at the same time; fill in the refueling control card and indicate the symbol of temperature and humidity sensitive components when changing materials; return the materials according to the storage regulations and then pack and store them according to the corresponding requirements after demystification.

D. Dehumidification operation - select the baking conditions and time according to the humidity level of the SMD components, environmental conditions, and opening time.

The above is the introduction of the control method of the DC variable frequency submersible pump. If you want to know more about the micro water pump, please contact us.

Reliability Commitment: "At Pinmotor, our DC variable frequency control logic is not only optimized for efficiency but also rigorously tested to comply with IEC 60034 (Rotating Electrical Machines) and EMC Directive 2014/30/EU. By adhering to these global standards, we guarantee that our pump control systems provide long-term stability and electromagnetic compatibility in diverse operational environments."

Author: Jinxiu Wangh Senior R&D Engineer | Motor Control & Power Electronics Specialist

About the Author: Jinxiu Wangh is a Senior Electrical Engineer at Pinmotor with over 8 years of experience in brushless DC (BLDC) motor drive systems and frequency conversion technology. He specializes in PID algorithm optimization and has led the development of energy-efficient control systems for industrial-grade submersible pumps.