When the fan and pump start, the current has a significant impact on the power grid, which is unstable; The noise during work is loud, which has a significant impact on on-site personnel; In order to ensure the reliability of production, various production machinery has a certain margin (safety factor) when designing power drives. When the motor cannot operate at full load, in addition to meeting the power drive requirements, the excess torque increases the consumption of useless power, resulting in waste of electrical energy. The traditional method of adjusting the flow rate of equipment such as fans and pumps is to adjust the opening of the inlet or outlet valves (butterfly valves, ball valves) to adjust the air volume or flow rate. The input power is high, and a large amount of energy consumption is consumed in the interception process of the valve system. When using frequency conversion, if the flow rate requirement is reduced, the requirement can be met by reducing the speed of the pump/fan.

The variable frequency control cabinet for fans and pumps is a specialized energy-saving electrical cabinet designed specifically for fluid transportation of fans and pumps based on their operating characteristics. It adopts embedded intelligent control technology, magnetic flux and speed estimation technology, and variable frequency speed regulation technology. Fundamentally eliminating the power waste phenomenon of "big horse pulling small cars" that commonly exists in fan and pump equipment due to selection or load changes, ensures that the equipment always operates in its optimal working state, thereby saving a large amount of electrical energy.

Advantages of variable frequency control cabinets for fans and pumps:

The energy-saving system of variable frequency control cabinets for fans and pumps is achieved through functions such as soft start, speed regulation, energy-saving modules, power factor improvement, reactive power compensation, and harmonic control. It is a comprehensive energy-saving product that can ensure the highest energy-saving efficiency.

1. Variable frequency energy-saving

According to fluid mechanics, P (power)=Q (flow) x H (pressure), flow Q is proportional to the power of speed N, pressure H is proportional to the square of speed N, and power P is proportional to the cubic of speed N. If the efficiency of the water pump is constant, when the flow rate is required to decrease, the speed N can decrease proportionally, and at this point, the output power P of the shaft decreases in a cubic relationship. The power consumption of fans and pump motors is approximately proportional to the rotational speed. For example, when the power of a water pump motor is 55KW, when the speed drops to 4/5 of the original speed, its power consumption is 28.16KW, saving 48.8% of electricity. When the speed drops to 1/2 of the original speed, its power consumption is 6.875KW, saving 87.5% of electricity.

By adjusting the frequency converter of the technical equipment of Shiyi Electric Technology (Shanghai) Co., Ltd. to operate the motor at an optimal speed, the power of the motor is adjusted, ensuring that the motor and equipment always operate at the optimal economic equivalent, achieving the goal of energy-saving operation of the motor.

2. Power factor compensation energy-saving

Reactive power not only increases line loss and equipment heating, but also mainly results in a decrease in active power of the power grid due to a decrease in power factor. A large amount of reactive energy is consumed in the line, resulting in low equipment efficiency and serious waste. According to the formula P=S x COS Ф， Q=S x SIN Ф (S - apparent power, P - active power, Q - reactive power, COS) Ф－ Power factor,) indicates COS Ф The larger the active power P, the greater the power factor. The power factor of ordinary fan and pump motors ranges from 0.6 to 0.7. After using a variable frequency speed control device, due to the effect of the internal filtering capacitor of the frequency converter, the COS Φ≈ 1. This reduces reactive power loss, improves power factor, and increases the active power of the power grid.

3. Soft start energy-saving

Due to the direct starting or star delta starting of the motor, the starting current is equal to (4-7) times the rated current, which will cause serious impact on the electromechanical equipment and power grid, and it will also have high requirements for the grid capacity. The large current and vibration generated during starting will cause great damage to the baffle and valves, which is extremely detrimental to the service life of the equipment and pipelines. After using our fan and pump frequency conversion control cabinets, the soft start function of the frequency converter will enable the starting current to start from zero, and the maximum value will not exceed the rated current, reducing the impact on the power grid and the requirements for power supply capacity, and extending the service life of equipment and valves. It saves equipment maintenance costs and is easy to operate and safe.

4. Light load voltage reduction and energy-saving

Fan and pump type variable frequency control cabinets achieve energy conservation by reducing voltage with a light load of a frequency converter. Dragging the torque load does not cause much change in speed, even if the voltage is reduced, so the energy conservation is very weak. However, when used in a fan environment, it is different. When a small air volume is required, the motor will reduce its speed. We know that the energy consumption of the fan is proportional to the 1.7 power of the speed, so the torque of the motor will sharply decrease, The energy-saving effect is obvious.

Note:

1. Those below 18.5KW are wall mounted cabinets, while those above 18.5KW are floor mounted cabinets;

2. If you have any special requirements, please contact us by phone first;

3. Can be customized according to customer requirements;

4. The pressure transmitter is provided by the customer. If we need to provide it, please provide special instructions.