There are two main differences between vector inverter and general inverter, the first is high control accuracy, and the other is high output torque at low speed. It can output 150%-200% of the rated torque. It should be a vector frequency conversion to decompose the motor current into D-axis current and Q-axis current, where D-axis current is excitation current and Q-axis current is torque current. By separating D and Q, the motor can get a larger starting torque. It is generally used in the occasion of heavy load starting. For example, high-power long belts, and hoists, etc. At this time, the general inverter is selected because the load is too heavy and the output torque is not enough when starting, the motor will not be able to start, and the motor stall or the inverter overcurrent and other faults will be reported.
Regarding the control of the general pump, you can choose the special type of fan pump or the general type, there is no need to choose the vector, and the price is high. The parameter settings are all very different. There are no major differences.
Using the analogy of driving, we know that vector control, also known as 'speed control', can literally see a few differences.
V/F control method: Just like the accelerator opening on your foot is constant when driving, and the speed of the car must be changing at this time! Because the road traveled by the car is uneven, the resistance of the road is also changing, the speed will slow down when going uphill, and the speed will accelerate when going downhill, right? For the inverter, your frequency setting value is equivalent to the opening of the accelerator pedal on your foot when driving, and the accelerator opening is fixed when you are operating at V/F.
Vector control method: You can control the car to keep the speed stable and unchanged as much as possible in the case of changes in road conditions, resistance, uphill, downhill, etc., so as to improve the speed control accuracy. So, if you want to keep the speed stable regardless of the uphill, downhill, and road resistance changes, the throttle opening must be adjusted at any time, right? As I just said: the speed setting value is equivalent to the throttle opening, the setting value has not changed, how does the throttle opening change and adjust the resistance at any time with the road conditions?
In fact, when you choose the control method as 'vector control', the CPU inside the inverter will enable this special function! Using the information fed back from the change of motor current, through the internal curing programs and formulas of the CPU, and through the internal PID conditioner of the CPU, the opening of the throttle (the amount of fuel intake of the engine) is continuously added or decreased on the basis of your original throttle opening.
So, on the surface, your throttle opening doesn't change when you control V/F and vector control, but in fact, when you control V/F, the throttle opening doesn't change, and when you control vector, the actual throttle opening changes (on the basis of your original throttle opening, up and down). In this way, the speed of the car can be as constant as possible.
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The inverter needs to be equipped with a braking resistor-Delta
The inverter is equipped with a braking resistor, mainly to consume part of the energy on the DC bus capacitor through the braking resistor to avoid the voltage of the capacitor being too high. Theoretically, if the capacitor stores a lot of energy, it can be used to release it to drive the motor to avoid energy waste, but the capacity of the capacitor is limited.
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Inverter environmental installation requirements and methods - Delta inverter
1. The environmental requirements of the inverter
Ambient temperature - 10 °C - 40 °C;
Ambient humidity: The relative humidity does not exceed 90% (no condensation);
Other occasions that require no direct sunlight, no corrosive gas and flammable gas, and less dust, with an altitude of less than 1000m.
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Correct use of Delta inverter in operation
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Whether the inverter needs to be added to the line - Delta
The role of the "communication input reactor" of the inverter input device is mainly to improve the power factor of the communication power supply on the communication side of the input side; It is useful to eliminate the higher harmonics on the input side to avoid damage to other electrical equipment caused by voltage distortion; Eliminate the three-phase AC power phase ...
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Repair of Delta inverter problemsView items
Daily inspection item 1 of Delta's inverter problem repair:
Check whether there is any abnormal change in the sound of the motor during operation, including whether oscillation occurs during the operation of the motor.
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1. Open-loop control
There is no reverse connection between the controller and the controlled target, and the control is carried out in one direction.
Strengths: Simple, stable and reliable. If the characteristics and parameter values of the components that make up the system are relatively stable, and the external disturbance is small, the open-loop control energy
Enough...
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Delta successfully held a seminar on new technologies for electronic power
From May 23 to 25, 2019, the Delta Power Electronics Technology Application Seminar, hosted by Delta Group of Zhejiang University, was held at the KONE Hotel in Wujiang, Jiangsu. Experts and professors from the power electronics technology industry from all over the world and 360 teachers, students and practitioners from more than 10 key universities such as Tsinghua University and Zhejiang University.
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The impact of inverters on motors – Delta inverters
1. Overvoltage
The output of the inverter has the function of voltage detection, and the inverter can actively adjust the output voltage so that the motor does not withstand overvoltage. Even when the output voltage adjustment fails and the output voltage exceeds 110% of the normal voltage, the inverter will be shut down and the motor will become infected.
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How to use Delta's inverter operation
(1) When the speed of the motor is controlled by the Delta inverter, the noise and temperature rise of the motor are higher than that of the frequency of the motor. When the motor is running at low speed, because the speed of the motor blades is low, the temperature rise of the motor becomes high.
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VFD center power electronics and control mode
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The gateway is connected to the Delta inverter
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Analysis of communication problems of Delta inverters
Problem Clarification:
Communication Transmission Timeout: The Modbus transmission between the VFD and the Keypad times out
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VFD does not respond to Keypad's communication commands.
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When using a large-capacity current transformer (more than 600kVA) and a phase-entering capacitor, the surge current on the input side of the power supply is too large, which may destroy the input side of the communication motor driver.
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Regular diagnosis and repair method of Delta servo motor
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Overhaul...
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2. Intercept the contactor of the motor from the output end of the inverter, and the control stop button and the inverter parking button are the same composite button, that is, when the inverter is pressed, the inverter parking will be followed by the contactor line.
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Several common problems of Delta and their solutions
What is the stall prevention function of the inverter?
If the given acceleration time is too short, the output frequency of the inverter changes much more than the change of speed, and the inverter will jump due to the flow of overcurrent, and the free operation is stopped, which is stalling. In order to prevent stalling and keep the motor working, ...
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