ABB PP836 3BSE042237R1 Control Panel Touch Screen Display Screen Inventory

Description

When the motor speed changes from N1 to N2,
The change relationship of PP836 flow is as follows:
Q2 / Q1 =（ N2 / N1）
The change relationship of head is as follows:
H2 / H1=（ N2 / N1 ）^ 2
The change relationship of motor shaft power P is as follows:
P2 / P1 =（ N2 / N1 ）^ 3

From the above formula, it can be seen that the shaft power P of the motor is PP836 and the motor speed is to the third power; Namely:
If the motor speed is reduced by half, the power will be only 1/8 of the original!
Therefore, for fan and pump loads, it is possible to achieve extremely significant energy-saving effect by using frequency converter to reduce motor speed.
PicSource：ABB
PP836 Now more and more cruise ships and engineering ships use electric propulsion devices. Through the use of frequency conversion devices, the power from the internal combustion engine is transmitted to the propulsion motor through rectification and inversion, and then the propeller is driven to rotate to drive the ship. Compared with the traditional internal combustion engine to directly drive the propeller, this way seems to be overkill, increasing energy consumption; In fact, this is precisely the use of the high efficiency of the motor and the cubic relationship between the above power and speed. While reducing the propeller speed, the output power of the motor is greatly reduced, and the internal combustion engine is always working at the best efficiency point, so as to achieve the purpose of energy conservation.
PicSource：studyelectrical.com
In addition, the use of frequency converter can also make the motor no longer show inductive load on the power grid, and increase the power factor from 0.6~0.8 to 0.96 or even 0.98, which will greatly reduce the reactive power loss of the motor, help to improve the energy utilization rate, and therefore play a huge role in energy conservation.
As inverter power supply
Since the invention of electricity, electric energy can only be stored in the form of DC. How to convert DC power to AC power for electrical equipment has always been a problem before the emergence of inverter devices. The difficulty is not the realization of the scheme, but the improvement of efficiency.
PicSource：Danfoss
In the past, the scheme that DC motor drives AC generator was used to convert DC power into AC power. In terms of energy conversion rate, the efficiency of DC motor and AC generator is basically about 70-80%. In addition to mechanical losses, the comprehensive efficiency is only 50-60% at best. However, the inverter is not. Its own efficiency is at least 90%, and the energy utilization rate is greatly improved.
PicSource：Danfoss
Because of its flexible frequency regulation characteristics, frequency converter is widely used as an intermediate frequency power supply in many industries. This should be regarded as another branch of inverter power supply.
Reduce starting impulse current
Increase motor protection
Strictly speaking, the reduction of impulse current and the additional protection for the motor are actually the additional benefits brought by using the frequency converter, not the initial purpose.
It should be known that the impact current when the motor is directly started can reach 5-8 times of the rated current of the motor. This current is a kind of injury to the motor or the power grid, and a test to the power supply device of the motor. However, because the frequency converter can modulate the frequency steplessly, the motor can slowly increase in speed according to the acceleration curve set by the frequency converter when starting, which avoids sudden changes in current and can keep the motor starting current below the rated current for a long time until the start is completed.
PicSource：SINAMICS | Siemens
In addition, frequency converters are now equipped with various protection functions, such as overvoltage, overcurrent, phase loss, overload, overheating, grounding, safety, etc. Although we can hardly feel their existence in most cases, these functions can play a vital role in protecting equipment at critical moments.
PicSource：KRONES
In a word, the usage scenario of frequency converter is constantly expanding. The current application field has far exceeded the original inventor’s vision of its functions. If we see the application of frequency converter in more new occasions in the future, we should not be too surprised.

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