Elevator frequency converter is a kind of instrument specially used for elevator control. Elevator inverter is a high-end product in small and medium power inverters. It improves elevator efficiency, runs smoothly, and extends equipment life. Combining with PLC or microcomputer control, it also shows the advantages of non-contact control: line simplification, flexible control, and operation Reliability, maintenance and fault monitoring are easy. Let's take a look at the principle of elevator drives and the price of elevator drives .
The main function of the elevator frequency converter
Elevators have to be comfortable and require slow acceleration of the elevator. This involves the problem of motor speed regulation:
1. Other speed control methods, such as series resistor speed regulation: It reduces the internal voltage of the motor by connecting a resistor in series to reduce the speed. The disadvantage is that it will consume a certain amount of energy in the series resistance.
2. This situation does not exist with the inverter. It directly controls the frequency and voltage of the output to drive the motor. There is no additional consumption.
Elevator inverter principle
Now the elevators are controlled by frequency converters. When the frequency converter fails, it will cause inconvenience to many people. If maintenance personnel can correctly understand the principle of elevator frequency converters, maintenance will be easy.
The following is our knowledge of this area by Huibo Times Technology Co., Ltd.
The power supply we use is divided into AC power supply and DC power supply. Generally, the DC power supply is mostly transformed from AC power supply through a transformer, and is obtained after rectification and filtering. AC power accounts for about 95% of the total power used by people using power. Whether it is used in homes or factories, single-phase AC power supply and three-phase AC power supply, its voltage and frequency have certain standards according to the regulations of each country. For example, in Mainland China, direct-user single-phase AC power is 220V, three-phase AC. The voltage of the wire is 380V and the frequency is 50Hz. The voltage and frequency of power supply in other countries may be different in voltage and frequency in our country. For example, single-phase 100V/60Hz, three-phase 200V/60Hz, etc., standard voltage and frequency AC power supply Called industrial frequency alternating current.
In general, a device that converts a fixed-frequency alternating current of a voltage and a frequency into a voltage or variable-frequency alternating current is referred to as a "frequency converter." In order to produce a variable voltage and frequency, the device first converts the alternating current of the power supply to direct current (DC). This process is called rectification. The device that converts direct current (DC) to alternating current (AC) is scientifically termed "inverter" (inverter). The general inverter is an inverter power source that inverts the DC power supply to a certain fixed frequency and a certain voltage. For inverters with reversed frequency and adjustable voltage, we call them frequency converters. Inverter output waveform is analog sine wave, mainly used in three-phase asynchronous motor speed control, also known as frequency converter. For the variable-frequency inverters that require higher waveforms in instrumentation testing equipment, the waveforms should be sorted and the standard sine wave can be output, which is called variable-frequency power supply. The general variable frequency power supply is 15-20 times the price of the frequency converter.
Since the main device that generates the changed voltage or frequency in the inverter device is called "inverter", the product itself is named "inverter", namely: inverter. The frequency converter can also be used for home appliances. Home appliances using frequency converters include not only motors (such as air conditioners) but also fluorescent lamps. The inverter used for motor control can change the voltage and change the frequency. However, inverters for fluorescent lamps are mainly used to adjust the frequency of power supply. Devices used in the car to generate AC from batteries (DC) are also sold under the name "inverter." The working principle of the frequency converter is widely used in various fields. For example, the computer power supply, in this application, the inverter is used to suppress the reverse voltage, frequency fluctuations and power supply momentary power.
According to the elevator inverter principle, we have repaired many inverters used in elevators. We have found that many faults are caused by the high temperature of the work environment and the components are prone to aging. The elevator inverters are installed in the control room at the top floor of the building, often in the summer. The sun's exposure, together with the frequency converter itself and the heating of the braking resistor, make the temperature in the electrical room very high, and the high working environment temperature will shorten the service life of the electronic components! Inverter is more obvious in this regard, so the elevator electrical room in the design of the ventilation in addition to the problem but also pay attention to insulation, such as the wall with hollow bricks, roof multi-layer design, if you can match the air conditioner, the inverter life will be much longer !
Elevator frequency converter application matters needing attention
1) The temperature of the elevator electrical room can not be too high, otherwise the inverter components are prone to aging, it is best to have air conditioning, the consequences are quite good!
2) To prevent the rain from getting wet, usually when the typhoon is blown, the window door is blown by the wind and the inverter is splashed into the rain.
3) Lightning protection, this is related to the entire building or the whole area of lightning protection facilities, and individual inverters damaged by lightning are severely damaged.
4) The cooling fan of the frequency inverter should be cleaned regularly. The maintenance method of the inverter adopts two methods: online voltage detection and DC resistance measurement, and it is found that it must be exchanged when there is noise or no operation.
5) There is abnormal noise in the elevator motor. Usually there is a problem with the inverter. If the three-phase current of the motor is not balanced, it is better to repair it at this time. When the inverter is not complete, the damage may be severe.
Elevator frequency converter price
The elevator frequency converter is a very common device in the modern electrical equipment, and the elevator frequency converter is a kind of instrument specially used for the elevator control. Elevator frequency converter control of the elevator is S-type, that is, start and stop the acceleration are relatively modest, while the middle process, the acceleration is relatively fast, mainly for ride comfort, energy saving is also on the one hand, this is a common point of the inverter.
Elevator frequency converter price is generally about 5,000 yuan, I hope my answer is helpful to you oh
Conclusion: The relevant information about elevator inverter principle and elevator inverter price is introduced here for everyone. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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