The VFD frequency inverter for water pump

The load of the production equipment of industrial enterprises is mostly AC asynchronous motors, and the power consumption accounts for about 65% of the total power consumption of the enterprise. Especially the efficiency of the pump load is relatively low. After China joined the WTO in 2002, the enterprise must reduce costs To improve economic efficiency. In order to enhance competitiveness, in reducing production costs, saving electricity is an important economic link. For example, in a water supply station, the water supply system is adjusted according to the demand of water consumption, and the flow rate is adjusted by adjusting the valve of the pump out door. Special personnel are required to watch the valve under different circumstances. The labor intensity is large. At the same time, due to the forced throttling of the valve, the pump forms a vortex impact, which generates strong vibration and noise, which increases the unfavorable loss of the service life and maintenance of the pump. Furthermore, because the torque of the motor is basically constant, the water supply pressure formed by this adjustment method is high, causing severe throttling power loss, reducing the efficiency of the pump, and wasting electric power.

With the development of electric power technology, the frequency conversion speed regulation technology is becoming more and more perfect. The intelligent water supply control system with frequency conversion speed regulation as the core has replaced the previous high-level water tank and pressure tank and other water supply equipment. Therefore, the impact on the power grid during starting is avoided; because the average speed of the pump is reduced, the service life of pumps and valves can be extended; the water hammer effect during starting and stopping can be eliminated. Its stable and safe operation performance, simple and convenient operation mode, and complete and thoughtful functions will make the water supply realize water saving, electricity saving, manpower saving, and finally achieve the purpose of high efficiency operation.


Frequency conversion speed regulation has the following advantages:
①The slip rate is small, the slip loss is small, and the efficiency can be as high as 90 ~ 95%.
②Smooth stepless speed regulation is realized, with high precision, wide speed regulation range (0 ~ 100%), and large frequency variation range (0 ~ 50Hz).
③ The starting torque is large (up to 1.1 times of the rated value), and the soft start can reduce the impact of the starting current.
④ Improve the power factor on the grid side.
⑤Inverter can use high-speed 16-bit CPU and special large-scale integrated circuit, use software to realize V / 5 automatic adjustment, with the function of online control with computer programmable controller, easy to realize automatic control of production process.
⑥Easy installation, convenient debugging and simple operation.
⑦Not only suitable for energy-saving speed regulation of pumps and fans, but also suitable for the transformation of old equipment, especially for improving process conditions and product quality.

Solar inverter MPPT Photovoltaic Inverter Power Controller

Product introduction

Product name: photovoltaic inverter

Voltage level: 220V / 380V

Product description

The built-in MPPT controller for photovoltaic inverters has an excellent MPPT algorithm suitable for various solar panels. The main circuit uses intelligent power modules with high reliability and a conversion efficiency of about 95%. It is especially suitable for photovoltaic-driven fans and pumps load.

Three, servo drive characteristics of  machine
1.Support boost module , increase PV output voltage;

2. The speed range of the pump can be freely set according to the actual system situation;

3, soft start, reduce the top voltage spikes, with over-voltage, under-voltage, over-current, overload and other protection functions;

4. Support photovoltaic input and AC grid input;

Fourth, matters needing attention
1. Do not use the inverter for overload. For example, the inverter power is lower than the motor power, or the ordinary motor is running more than 50HZ, otherwise the inverter will skip the load protection fault frequently, and even the explosion machine, the motor may be burned due to overheating.

2. The default upper limit frequency of the inverter is 50HZ, and the anyway function is turned off by default. If you need to change it, please contact the manufacturer for after-sale or follow the instructions to operate correctly;

3. Do not connect any switches in series between the output terminals U, V, W of the inverter and the motor, including contactors. Do not use the inverter as a power source. During the operation of the inverter, you cannot suddenly turn on any equipment through the switch.

4. The lead-in distance of the inverter’s operation panel should not be too long. If it exceeds 5M, it is recommended to use an external potentiometer to adjust the speed and connect it with a shielded wire. The terminal control mode can be used for start-stop control;
5. The panel connection cable is too long and is easily affected by harmonic interference, which makes the frequency control of the inverter inaccurate and the frequency fluctuates greatly;

6. The DC input voltage should meet the recommended voltage as much as possible, otherwise the solar energy conversion rate will be reduced;

7. The AC input and DC input switches cannot be closed at the same time, otherwise the inverter or solar panel will be damaged.

Winter freeze protection of factory pipelines and countermeasures

1. Water line for process. Where it is installed on the ground and the water consumption is not large, it should be ensured that there is a venting valve at the end of the pipeline to keep the water flowing to prevent freezing. If conditions permit, heat preservation should be added to the pipeline.

2. The water line used intermittently must be installed with electric heating cable for heat preservation, otherwise it will not be used.

3. For water lines not used in winter, the flanges on both sides should be dismantled, and the water should be drained. If conditions permit, the industrial wind should be used to ensure that the water in the pipeline is not filled. If the switch is not strict, it should be Add blind plates at the flanges that are disassembled at both ends, and register and hang them.

4. For some pipelines that are not used in normal production, due to long-term deactivation, there may be accumulated water in the dead corner and frozen. Once used, it will cause nowhere and affect production. Before such a pipeline enters the winter, the pipeline should be unblocked and replaced with an appropriate flow rate, and the relevant valve is closed to maintain the standby state.

5. Fire hydrant of fire water line system, fire water line valve well, etc., it is necessary to close the valve in the valve well and put the water in the water plug to ensure that the water hydrant can be used at any time. A double-layer manhole cover (one of which is an insulated manhole cover) should be used in the fire well.
Freeze processing

After the equipment is frozen, steam or thermal hydrolysis should be applied. The thawing of cast iron pipelines and equipment should be slow. Explosion-proof, freeze-thawed pipelines or equipment are prohibited from heating under sealed conditions. The venting should be opened first, and the horizontal tubes should be thawed from low to high. From top to bottom, if there is a crack, it should be reported.
Factory antifreeze 30 small knowledge

1. Do a good job in personal protection, wear warm, and do the anti-skid work of the tower under the tower during the inspection process.

2. Strengthen the dehydration work and discharge the moisture of each dehydration point in time to prevent freezing.

3. Pay attention to the fact that the upper level valve of the liquid level gauge on the instrument level gauge will have a frozen plug which will affect the real liquid level. The freezing block at the head of the remote liquid level gauge will affect the mechanical rotation and current conduction. Affect the true level.

4. The temperature of the circulating water is not easy to control too low, and can not be lower than 8 degrees. After being lower than octave, the secondary line of the cooler will be blocked by freezing, and the pipe will be cracked if it is severe.

5. Insulate the pipeline in the circulating water stagnant water zone of the workshop; the decommissioned circulating water pump adopts the reverse flow measure and is discharged.

6. Equipment that is deactivated in the workshop, such as: make-up water pump, circulating water pump, cooler, condenser, etc., should adopt measures such as water discharge and regular inspection. The compressor cooling water is regularly checked by the operator to ensure that the water valve remains open.

7. If the liquid hydrocarbon pipeline is frozen, when the steam purges the pipeline, pay attention to the physical explosion, do not force the purge, and slowly preheat.

8. The on-site pressure gauge will also have an illusion in the case of freezing, and judge according to experience. If it is not certain, it should be reported in time for processing.

9. When purging the frozen plug line, use steam to purge the elbow.

10. Pay attention to the enhanced deliquoring of the natural gas pipeline to prevent the liquid from being brought into the boiler. Check the natural gas line to prevent the crystal structure from being frozen due to freezing.

11. Strengthen the inspection and check the temperature of each point.

12. The raw water pipeline should be prevented from shutting down and maintaining long water flow.

13. Discontinued equipment, the blind line should be added to the connection between the pipeline and the production system, and the accumulated water should be drained and purged. Open-air equipment and open equipment to prevent stagnant water from freezing and freezing equipment. Open-air equipment needs to increase the number of inspections and the number of vehicles.

14. All equipments for production, living and temporary decommissioning, water vapor pipelines, control valves shall have anti-freezing and thermal insulation measures, clean water discharge or adopt a method of maintaining a small amount of long water flow and small over-gas to meet the requirements of both anti-freeze and saving. Be sure to purge after stopping the water and stopping the steam.

15. Strengthen the inspection and dehydration, check the dehydration of the low point of each equipment and the low point of the pipeline, the pump cooling water can not be interrupted, the heating and heating are kept unblocked, the pressure gauge and the liquid level gauge should be checked frequently, the steam and water hose joints, the steamed bread Keep the steam flowing long.

16. Valves that do not move can not be hard-switched, motorized discs do not move, and must not be activated.

17. The frozen iron valve should be heated slowly with warm water or a small amount of steam to prevent sudden heat damage.

18. Construction and domestic water should be managed to discharge to the trench or not affect the passage. The ice skates should be destroyed at any time.

19. Strengthen management to establish anti-freeze anti-condensation accounts (including accident registration, anti-freeze anti-coagulation equipment in good condition, easy to freeze the pipeline, etc.).

20. Valve wells, fire hydrants, and trenches at low temperature should be inspected one by one, draining water, and taking anti-freeze insulation measures.

21. It is strictly forbidden to use high-pressure steam for heating to prevent high-pressure steam from entering the low-pressure system. High and low pressure steam return pipes are not allowed to collude with each other. A pressure reducing valve shall be provided on the steam heating radiator line, the pressure gauge for the pressure reducing valve shall be verified, and the radiator shall be used after the exhaust gas is leak tested.

22. Everything in the workplace must be clear before the accumulation of water, snow and ice.

23. Therefore, the steam line (except the fire steam) closes the root valve, closes the wall valve, opens all the venting valves, drains the water, and purifies it with nitrogen.

24. All condensing points need to be discharged every hour.

25. After the circulating water system stops, you need to empty the low point to open all the water and blow it off with the wind.

26. The adsorption tower, desulfurization tower, water washing tower and gas-liquid separator sewage pipeline outside the workshop shall be anti-freezing by electric heating cable. The water separator and the cooler in the workshop are cleaned in a timely manner after being stopped.

27. When the indoor heating is stopped, the safety facilities such as tap water, eye washers and fire fighting boxes in the workshop shall be equipped with electric equipment to prevent freezing.

28. If water is sprayed on the floor and platform of the workshop, clean it immediately to prevent freezing. Workshop personnel improve safety awareness and awareness when climbing the platform and climbing stairs.

Water pump inverter

Pump inverter product features
■Design for water pump constant pressure energy saving control
■ Built-in PID and advanced energy-saving software
■It can realize multi-point pressure timing function for one turn and one minute
■High efficiency and energy saving, 20%~60% power saving effect (depending on actual working conditions)
■Simple management, security protection, automatic control
■ Extend equipment life, protect grid stability, reduce wear and reduce failure rate
■ Realize soft start and brake function

Main application of variable frequency speed regulation constant pressure water supply equipment
1. High-rise buildings, urban and rural residential quarters, enterprises and other domestic water;
2. All kinds of industries need constant pressure control water, cooling water circulation, thermal network water circulation, boiler hydration, etc.;
3. Central air conditioning system;
4. Water plant booster system;
5. Farmland irrigation, sewage treatment, artificial fountains;
6. Various fluid constant pressure control systems.

Photovoltaic (MPPT ) solar inverter water pump system

Photovoltaic water pump system is also called photovoltaic lift water system, which consists of photovoltaic solar panels, special inverters for photovoltaic, water pumps, and water storage devices. The principle is to use semiconductors to absorb solar radiation energy, and convert it into direct current, and then convert it into alternating current through a photovoltaic inverter to drive the pump to lift water.


Photovoltaic pump system features:
Clean Energy: Solar energy is driven as a power source and has zero pollution to the environment;
Affordable: No need to lay power lines, greatly reducing system construction costs;
Safe and reliable: automatic operation, no need to be on duty, to replace water storage power storage, direct drive pump water, to avoid large-scale laying of the hidden safety problems caused by the cable, high reliability, significantly reduce the system’s construction and maintenance costs.
Intelligent adjustment: adjust the speed of the pump according to the change of the sunshine intensity so that the output power is close to the maximum power of the solar array; when the sunshine is sufficient, the rotation speed of the water pump does not exceed the rated rotation speed; when the sunshine is insufficient, according to the set conditions, automatic Stop or switch to commercial power to ensure the system continues to operate economically.
Widely used: The water pump is driven by a three-phase AC motor, pumping water from a deep well, injecting a water storage tank/pool, or directly accessing an irrigation system. According to actual system requirements and installation conditions, different types of pumps can be used for work. And can provide economical and effective solutions based on the needs of different regions and customers.


Photovoltaic water pump to inverter requirements
1. With MPPT algorithm, adjust the pump speed according to the change of sunshine intensity so that the output power is close to the maximum power of the solar array. Due to the non-linearity of the output characteristics of the photovoltaic array, its output is affected by the light intensity, ambient temperature and load conditions. Under a certain light intensity and ambient temperature, the photovoltaic array can work at different output voltages, but only at a certain output voltage value. At this time, the output power of the photovoltaic cell can reach its maximum value. Therefore, in the solar photovoltaic pump system, to improve the system efficiency, the output power of the photovoltaic array must be detected in real time and the operating point of the photovoltaic cell must be adjusted so that it always operates near the maximum power point, so as to satisfy the solar energy requirement under different solar illumination conditions. More is converted into electrical energy to enable the pump to work efficiently and stably. Therefore, Maximum Power Point Tracking (MPPT) is the core function of the PV Pump Frequency Converter.
2, with a dry burning detection, automatic protection of the pump. The working environment of the water pump is in the water. The water pump motor is used to radiate heat by water. It is forbidden to run under broken water. However, the water level of the water pump is very different according to the amount of water supply and the change of the water source. Burning the pump motor affects the reliability of the system.
3, according to changes in light intensity, automatic sleep wake up. In order to meet the requirements of the system’s automatic work, the system should have the function of self-diagnosis and automatic start-up. The control system should conduct self-testing and pre-judgment before the pump work, and start the photovoltaic pump work or charge the lighting battery after the conditions are met; In cloudy and thundery weather, the system can stop the work of the photovoltaic pump according to the detected data. When the light meets the working requirements of the photovoltaic pump, the system can automatically resume operation.
4, the system has lightning protection and other functions, when the over-voltage, under voltage, over-current, overload, overheating, water tank full of water, water pump and other failures have been lifted, the system can automatically resume working after self-diagnosis.
5. It can cooperate with water level switch and water tower to store water and improve water use efficiency.

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