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Various control methods for FFUs and their advantages and disadvantages

The general control system is divided into four types: multi-speed switch control, continuous speed adjustment control, computer control, and remote control.
Of these methods, the first two require high energy consumption and are not very convenient to control, while the better of these is computer control, which can save energy, control convenience, and also effectively extend the service life of the equipment.
Now let us look at the advanced features of this control method specifically!

1、Adopting the centralized control method, it is easier to realize the centralized monitoring of FFU;

2, easier to achieve single, multiple FFU and partition control;

3, can achieve intelligent control system, but also has the role of energy saving;

4、The FFU can be monitored and controlled by remote control;

5, this control system is also reserved for communication interfaces and can communicate with the upper computer or the entire network in time to achieve remote management functions.

Although the advantages of this method are many, the disadvantages are also inevitable.

1, because most clean plants do not allow FFU to bring their brushes, so most of the FFU motors are brushless DC motors, in which the phase change problem is solved by the electronic phase changer, which has a very short life span and also affects the life span of the whole control system;

2, the overall cost of this control system is still very expensive;

3, at the same time the cost of maintenance is also very high.

After looking at the advantages and disadvantages of the computer control system, let's look at the AC control method in FFU, which can be divided into two types: voltage control and frequency control.
The so-called voltage regulation control method means that the speed of motor rotation is adjusted by changing the size of the motor stator voltage, which has the disadvantages of lower efficiency, more serious heat generation, and narrow speed range, but the relative advantages are also obvious: 

1, the speed regulation scheme of the system is relatively mature, stable operation, can ensure a long period of continuous operation, with few failures;

2, the overall operation of the system is simple, and the cost is very low;

3, this method is particularly suitable for fan loads, because the FFU fan is responsible for the unique damping curve, so with the use of this method, the speed range will be very wide.