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Generally speaking, when a motor is operated by a frequency converter, only the matching motor capacity of the frequency converter can be matched with the actual motor capacity. When a converter operates two motors together, in principle, the capacity of the auxiliary motor of the converter should be equal to the sum of the capacities of the two motors. However, when the water consumption of medical pure water equipment at peak load is much different from that of two pumps at full speed, we can think about reducing the capacity of the frequency converter appropriately, but we should pay attention to keeping the capacity satisfied.

Although the pump operates at low speed, the operating current of water-using equipment in the chemical industry of motors is relatively small. However, when the user's water consumption changes the frequency, the motor will be in the state of frequency rise and fall, and the current of rise and fall can slightly exceed the rated current of the motor, resulting in motor overheating. Therefore, the thermal maintenance of the motor is necessary. For this kind of temperature rise, which is piled up because of the frequency rise and speed drop, the electronic thermal maintenance function in the frequency converter is difficult to maintain. Thermal relays should be used in the thermal maintenance of the motor for food and water equipment.

The energy-saving effect is very obvious (can be calculated according to the specific situation) when the constant-pressure water supply is completed by frequency conversion and speed regulation, compared with the constant-pressure water supply by regulating valve. Its advantages are:

1. Start-up balance of constant voltage and frequency conversion water supply equipment. Start-up current can be limited to rated current, and then the impact of starting on electricity can be avoided.

2. The constant pressure variable frequency water supply equipment can extend the service life of the pump and valve because the average speed of the pump is reduced;

3. Constant pressure and frequency conversion water supply equipment can eliminate the water hammer effect when starting and stopping.

Author: Hangzhou Water Shield Technology Co., Ltd.

Website: http://www.zjhzsd.com/

Key words: pharmaceutical pure water equipment, chemical industry water equipment, food water equipment