Xi'an YuanQi Elevatorparts Company: How does elevator inverter work ?

Xi'an YuanQi Elevatorparts Company: How does elevator inverter work ?: Now lift  elevator inverter  principle are used to control the frequency converter, the fault when the inverter will cause inconvenience ...

How does elevator inverter work ?

Now lift elevator inverter principle are used to control the frequency converter, the fault when the inverter will cause inconvenience to many people, if maintenance personnel can correctly understand the principle of elevator drive, then you have easy maintenance. Here by us Hui Bo Times Technology Co., Ltd. was telling you about this knowledge. VVVF Variable Voltage and Variable Frequency is the acronym meaning changing the voltage and frequency of change, that is, they say, VVVF. CVCF is Constant Voltage and Constant Frequency acronym, meaning constant voltage, constant frequency, that is, they say, constant voltage constant frequency. We use the power into AC power and DC power, DC power supply generally mostly through the transformer from the AC power source transformer, rectifier obtained. AC power using the power of the people accounted for 95% of the power used. Whether for home or for factories, single-phase and three-phase AC power supply, the voltage and frequency according national regulations have certain criteria, such as mainland China provides direct user single-phase AC power is 220V, three-phase AC wire voltage 380V, frequency of 50Hz, other countries may be in supply voltage and frequency of the voltage and frequency are different, if single-phase 100V/60Hz, three phase 200V/60Hz, etc., the standard voltage and frequency of the AC power supply called frequency alternating current.

Typically, the voltage and frequency fixed frequency alternating current is converted to a variable frequency AC voltage or a device called a "drive." In order to generate a variable voltage and frequency, the device is first necessary to convert AC power to DC (DC), this process is called rectification. The direct current (DC) is converted into alternating current (AC) of the device, its scientific term for the "inverter" (inverter). General Inverter is the DC power inverter is a certain fixed frequency and constant voltage power inverter. For the adjustable frequency inverter, voltage adjustable frequency inverter we called. Inverter output waveform is an analog sine wave, is mainly used in three-phase induction motor drive with, also known as inverter. Mainly used in the instrumentation for the detection devices require a higher variable frequency wave inverter, to sort out the waveform, you can output standard sine wave, called the variable frequency power supply. Frequency power inverter prices are generally 15 - 20 times. Since the inverter device generates a voltage or frequency changes in the primary device called "inverter", so the product itself is named "inverter", namely: inverter. Inverter can also be used in home appliances products. Use the inverter home appliances products, not only motor (such as air conditioning, etc.), as well as fluorescent lamps and other products. Inverter for motor control, either change the voltage, but also can change the frequency. But are used primarily for regulating fluorescent lamp inverter power supply frequency. Used car battery (DC) to produce alternating current devices "inverter" name for sale. The working principle of the inverter has been widely used in various fields. Such as computer power supply, in the application, the drive for inhibiting reverse voltage, frequency fluctuations and power of instantaneous power.

We repair a lot of the elevator inverter schematic inverter for elevator and found a lot of trouble because of their work environment through high temperature components likely caused by aging, elevator inverter installed in the building's topmost control room, often in the summer by sun exposure, coupled with the drive itself and the braking resistor heating, the electrical room temperature is very high, the working environment temperature will shorten the life of electronic components! Drive more obvious in this regard, the elevator electrical room ventilation problems in the design in addition to also pay attention to insulation, such as walls with hollow bricks, chamber top multi-layer design, if accompanied by an air conditioner, the drive's lifespan considerably longer !

Xi'an YuanQi Elevatorparts Company: The use of elevator inverter

Xi'an YuanQi Elevatorparts Company: The use of elevator inverter:     VVVF elevator inverter lift electronic control system includes the main controller, inverter and other hosts. MicroMaster440 series inv...

The use of elevator inverter

    VVVF elevator inverter lift electronic control system includes the main controller, inverter and other hosts. MicroMaster440 series inverter is developed by Siemens Multifunctional inverter. It's rated power ranges from 0.12Kw to 75Kw (constant torque), using a modular design, compact structure, having a plurality of freely defined input and output points, to meet a variety of customer requirements. The inverters are microprocessor controlled and uses advanced technology with modern insulated gate bipolar transistor (IGBT) as the power output devices. Therefore, they have a high reliability and functional diversity. A pulse width modulation switching frequency is optional, which can reduce the operating noise of the motor. Full and complete protection for the inverter and the motor provides a good protection.

Control System Components

    Electric control system uses a table 15kw motor, an inverter 15kw MicroMaster440 units as the main driver. Inverter braking unit and braking resistor feedback when releasing the brake run mechanical energy. System is simple and reliable, more traditional control method saves installation space, and improve reliability. Smooth motor starting current impact is small. Mechanical shock is also greatly reduced, increased operating life. Inverter control via terminals through digital input terminals (DIN) ON/OFF1 command and given a fixed frequency reference. Through three relay output signals to the feedback current inverter operation status, received by the encoder template rotary encoder signals. Inverter using closed-loop vector control.

Operating principle and functions

    Elevator inverters are used in applications where higher-end transmission applications must use closed-loop vector control to achieve good control effect. Vector control is a theory first proposed by Siemens and the practical realization of the project first phase asynchronous motor control, has reached the level of DC motor control. It simulates the DC motor control torque of the motor current is divided into two directions, respectively, and the excitation control can be used for high-precision speed control, torque control. In order to avoid starting to slip, and to overcome the startup guide shoes and static friction between the rails is a good start to achieve comfort, you need to start the process, open the front brake that is applied to a very small additional speed setpoint to inverter, the brake open the motor is in apparent motion non-moving state to strictly follow the speed given curve, to ensure comfort.

Xi'an YuanQi Elevatorparts Company: elevator inverter commissioning

Xi'an YuanQi Elevatorparts Company: elevator inverter commissioning: elevator inverter commissioning 1 Set the motor power, very few, considering the elevator to the operating current of the inverter. (2) S...

elevator inverter commissioning

elevator inverter commissioning
1 Set the motor power, very few, considering the elevator to the operating current of the inverter.
(2) Set the maximum output frequency of the inverter elevator, baseband, set the torque characteristics. Universal elevator inverter are available in many VPf curve for users to choose, users should be used according to the nature of the load curve select the appropriate VPf. If the fan and pump load, the torque converter to the elevator run code set to become operational characteristics of torque and torque reduction. In order to improve low-speed elevator inverter startup performance, so that the motor output torque can meet the production requirements of the load starts, to adjust the starting torque. In Thyssen Elevator parts of induction motor speed control system, the torque control is more complex. In the low frequency range, since the resistance, the leakage resistance effect can not be ignored, if VPf remain constant, the flux will decrease, thereby reducing the output torque of the motor. Therefore, the voltage at low frequencies to be appropriately compensated for to improve torque. Lift the drive by the general user manual to set the compensation. 3 Set the elevator inverter comes with keyboard operation mode, press the Run button, stop button, observe whether the motor can normally start, stop.
4 familiar with the drive is running a protection code fails to observe the thermal protection relay factory value, observe overload protection settings can be modified if necessary. The use of personnel elevator inverter can drive to the operating instructions for the inverter to set the electronic thermal relay function. When the inverter output current exceeds its allowable current, the inverter overcurrent protection will shut off the inverter output. Therefore, the inverter electronic thermal relay does not exceed the maximum threshold for the maximum allowable output current of the inverter.

Xi'an YuanQi Elevatorparts Company: Maintenance and inspection of the elevator guide s...

Xi'an YuanQi Elevatorparts Company: Maintenance and inspection of the elevator guide s...: Maintenance and inspection of the elevator guide shoe 1) side of the boot liner of the car elevator guide shoe and the guide rail gap is ...