Working principle of elevator inverter
Elevators are now controlled by inverters. When the inverter fails, it will cause inconvenience to many people. If maintenance personnel can If you correctly understand the principle of the elevator inverter, maintenance will be easy.
VVVF is the abbreviation of Variable Voltage and Variable Frequency, which means changing voltage and changing frequency, which is what people call variable voltage and frequency.
CVCF is the abbreviation of Constant Voltage and Constant Frequency, which means constant voltage and constant frequency, which is what people call constant voltage and constant frequency.
The power supply we use is divided into AC power supply and DC power supply. The general DC power supply is mostly obtained by transforming the AC power supply through a transformer and rectifying and filtering it. AC power accounts for about 95% of the total power used by people. Whether used in homes or factories, the voltage and frequency of single-phase AC power supply and three-phase AC power supply have certain standards according to the regulations of various countries. For example, mainland my country stipulates that direct user single-phase AC power is 220V, and three-phase AC power is 220V. The wire voltage is 380V and the frequency is 50Hz. The power supply voltage and frequency in other countries may be different from those in our country, such as single-phase 100V/60Hz, three-phase 200V/60Hz, etc., standard voltage and frequency AC power supply. It’s called power frequency alternating current.
Generally, a device that converts power frequency alternating current with fixed voltage and frequency into alternating current with variable voltage or frequency is called a “frequency converter”. In order to produce variable voltage and frequency, the device first converts the alternating current from the power supply into direct current (DC), a process called rectification. The scientific term for a device that converts direct current (DC) into alternating current (AC) is “inverter”. Generally, an inverter converts DC power into an inverter power supply with a certain fixed frequency and voltage. The inverter with adjustable frequency and adjustable voltage is called a frequency converter.
The waveform output by the frequency converter is an analog sine wave, which is mainly used for speed regulation of three-phase asynchronous motors, also called a variable frequency speed regulator. For variable frequency inverters that are mainly used in instrumentation and testing equipment and have higher waveform requirements, the waveforms need to be sorted and can output standard sine waves, which are called variable frequency power supplies. Generally, variable frequency power supply is 15-20 times more expensive than the inverter. Since the main device in the inverter equipment that produces changing voltage or frequency is called “inverter”, the product itself is named “inve”.rter”, that is: inverter.
Inverters can also be used in home appliances. Among the home appliances that use inverters, there are not only motors (such as air conditioners, etc.), but also products such as fluorescent lamps. Used for motor control An inverter can change both the voltage and the frequency. But the inverter used for fluorescent lamps is mainly used to adjust the frequency of the power supply. The equipment used in cars to generate alternating current from batteries (direct current) is also named “inverter” For sale. The working principle of the inverter is widely used in various fields. For example, the power supply of computer power supply. In this application, the inverter is used to suppress reverse voltage, frequency fluctuations and instantaneous power outages.
Elevator inverter repair and maintenance
1. The temperature of the elevator electrical room should not be too high, otherwise the inverter components will easily age. It is best to install air conditioning, the effect is quite good!
2. Prevent rainwater from getting wet. Usually when there is a typhoon, the windows and doors are blown by the wind and the inverter is exposed to rainwater.
3. Lightning protection, this is relevant If there is a problem with the lightning protection facilities of the entire building or the entire community, the inverter struck by lightning is generally seriously damaged.
4. The cooling fan of the inverter should be cleaned regularly. If it makes any noise or is not running, replace it. .
5. Abnormal noises from the elevator motor are usually caused by problems with the inverter. For example, the three-phase current of the motor is unbalanced. It is best to repair it at this time. When the inverter fails completely, the damage may be serious. If you have no maintenance experience, do not repair it yourself to avoid making the inverter worse.
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