Medium Voltage Drive VFD 280KW 6.6KV HIVERT-Y 6.6/031

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Long lifetime


The DC bus capacitors provide an energy store and de-coupling buffer between the supply network and the load
side converter. The high value of the capacitors almost eliminates the voltage ripple and stabilizes the DC bus
voltage, suppressing disturbances caused by fluctuations of the load and supply side harmonics and switching
transients.Traditionally, the capacitors used for the DC bus have been of aluminium electrolytic type as the technology is mature and relatively low cost and also achieves a high energy density.

 

Disadvantages of electrolytic capacitors
However, electrolytic capacitors suffer from some disadvantages:
∙ Limited ability to handle large ripple current.
∙ Limited voltage rating and ability to handle voltage surges. It is necessary to connect capacitors in series and use voltage-sharing resistors, increasing system design complexity and reducing overall reliability.
∙ Limited lifetime.
∙ Unsuitability for long-term storage as spare parts.
∙ Failure modes may result in collateral damage to other components.

 

Advantages of metalized film capacitors
The RMVC 5100 uses metalized film capacitors which have the following advantages, despite having a lower power
density:
∙ Limited ability to handle large ripple current.
∙ Limited voltage rating and ability to handle voltage surges. It is necessary to connect capacitors in series and use
voltage-sharing resistors, increasing system design complexity and reducing overall reliability.
∙ Limited lifetime.
∙ Unsuitability for long-term storage as spare parts.
∙ Failure modes may result in collateral damage to other components.

.Medium Voltage Drive VFD 280KW 6.6KV HIVERT-Y 6.6/031

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Q:3.7KW inverter with 2.2KW 6-pole motor running to see the inverter shows the current is more than 4A, with the amount of clamp to 2.8A
Two questions: 1, the inverter output waveform is not a standard sine wave, with the ordinary calorimeter measured value is completely not allowed. The output current of the inverter is the same.
Q:What is the principle and implementation of the inverter?
How the inverter works: 1. DC can be converted into alternating current through the oscillation circuit 2. The resulting AC power is then boosted by the coil (in this case, the alternating current of the square wave) 3. Rectify the resulting alternating current to obtain a sine wave
Q:Inverter 0.2KW, the motor speed requirements down to 4 turn, the motor pole 4 pole. Can the drive drive the motor?
You can only use constant torque type of inverter. Motor selection frequency conversion motor. Driving is no problem
Q:What is the common COM point of the PLC and the inverter? Is it positive?
Plc is divided into two kinds of transistor output and relay output, com side may be connected to the high level may also be connected to the low level, the general input com port then low, the output port com mouth high, specifically what to take See the data sheet. Inverter is the same, the inverter has 24v com side and 10v com side, can not be connected together, com side generally low.
Q:Motor nameplate on the standard 2P, I set the number of motor pole in the inverter, is set 2 or 4 pole?
Then the motor nameplate on the standard 2P, it must be 2-pole motor, synchronous speed = 60 seconds x frequency (mainland 50Hz) / pole pairs, you can also look at the rated motor speed, about 2940 rev / 60s, so the inverter Set the number of motor poles, is set 2 pole, I hope you can be satisfied.
Q:11kw 6-pole motor can be used to adjust the inverter to 1800RPM?
Frequency converter in the 5-50Hz is constant torque frequency, 50-100Hz is constant power frequency, to see what you want to get the effect
Q:What is the difference between AC and DC frequency converters?
L inverter air conditioner refrigeration system components: inverter air conditioner by the compressor, evaporator, condenser, electromagnetic four-way valve, electronic expansion valve, defrost valve, double capillary and other components (see Figure II), work, air conditioner Room needs, automatic control of the inverter output frequency higher AC, the motor speed to speed up, the compressor cooling capacity increased to achieve the purpose of rapid cooling or heating, on the contrary, when the room cooling or heating less, Compressor to normal speed or lower speed operation, therefore, inverter air conditioner has a continuous cooling capacity adjustment, making the room temperature fluctuations smaller. In the process of compressor operation, the microcomputer system controls the inverter compressor at the same time, controls the opening degree of the electronic expansion valve, maintains the proper refrigerant flow, and directly changes the flow of the refrigerant in the evaporator to change its state, the compressor The speed corresponds to the opening degree of the expansion valve, and the displacement of the compressor corresponds to the supply amount of the expansion valve, so that the degree of superheat is not so large that the capacity of the evaporator is maximized, so that the refrigeration system The most efficient control.
Q:The inverter is running independently
Principle of operation The main circuit is to provide asynchronous motor to the frequency conversion power supply part of the inverter, the main circuit of the inverter can be divided into two categories: voltage is the voltage source of the DC converter for the exchange of the inverter, DC circuit filter Is a capacitor. Current type is the current source of the DC into AC inverter, the DC loop filter is the inductance. It consists of three parts, the frequency power supply is converted to DC power "rectifier", absorbing in the converter and the inverter voltage ripple "smooth circuit." The basic composition of the rectifier unit: the fixed frequency of alternating current converted to direct current. High capacity capacitance: store converted energy. Inverter: high-power switching transistor array composed of electronic switches, the DC into different frequency, width, amplitude of the square wave. Controller: According to the set program work, control the amplitude of the output square wave and pulse width, so that superimposed as an approximate sine wave AC, drive AC motor.
Q:How to view your own laptop power adapter is how much tile?
1, the power adapter has a logo, you can find their own look, close to the paper or direct letterpress printed with the voltage, current and power. If there is no write power, the direct voltage multiplied by the current is the maximum power. 2, if the power adapter only identifies the output voltage is 20V, the output current is 4.5A, then we formula W (power) = V (voltage) xI (current) to calculate. Calculate the formula with a power to know the output power is 20 × 4.5 = 90W.
Q:Motor 2 pole and 4 pole in the inverter with what set to show
The inverter has a parameter that requires you to enter the number of motor poles, see the direct input of the number of poles

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