Rectifier circuits
It consists of six rectifier diodes from VD1 to VD6 to form an uncontrollable full-wave rectifier bridge. Regarding the rated power supply of 380V, the reverse withstand voltage value of the diode should be 1200V, and the forward current of the diode is 1.414-2 times of the rated current of the motor.
Capacitance C1
Absorbing capacitance, the rectifier circuit output is a pulsating DC voltage that must be filtered.
transformer
A common electrical device that can be used to change a certain value of alternating voltage to another value of alternating voltage of the same frequency, and can also change the value of alternating current and change the impedance or change the phase.
Varistors
It has three functions: first, overvoltage protection; Second, lightning resistance requirements; 3. Safety testing requirements.
Thermistor: Overtemperature protection
Hall elements
It is installed in the middle of the UVW and is used to detect the output current value. The rated current is about 2 times the rated current of the motor.
Charging resistance
The function is to prevent the capacitor from short-circuiting to the ground at the moment of power-on, and the voltage at the two ends of the capacitor before the energy storage capacitor is burned out is 0V; Therefore, at the moment of power-on (power-on), the capacitor is short-circuited to the ground. If the rectifier bridge and the electrolytic capacitor are not charged without a charging resistor, it is equivalent to a direct short circuit of the 380V power supply to the ground, and the rectifier bridge will be blown up by an infinite current in an instant. Generally speaking, the higher the power of the inverter, the smaller the charging resistance. The selection scale of the charging resistor is generally 10-300Ω.
Energy storage capacitors
Also known as electrolytic capacitors, the primary role in the charging circuit is energy storage and filtering. The voltage working scale of the PN terminal is generally between 430VDC and 700VDC, and the general high-voltage capacitors are about 400VDC, in order to meet the withstand voltage requirements, it is necessary to string two 400VDC capacitors together for 800VDC. Capacity selection≥ 60uf/A
Voltage equalization resistor: prevent the energy storage capacitor from being burned out due to the uneven voltage of the energy storage capacitor; Because it is impossible for two electrolytic capacitors to be exactly the same, the voltage received on each capacitor may be different, and the heat generated by the high acceptance voltage (the equivalent series resistance in the capacitor) or the withstand voltage value may be exceeded and damaged.
C2 capacitor
The primary function of the absorption capacitor is to absorb the overcurrent and overvoltage energy of the IGBT.
Power strip
The switching power supply circuit provides low-voltage power supply to the operation panel, the main control board, the driving circuit, the detection circuit and the fan, etc., and the low-voltage power supply provided by the switching power supply includes: ±5V, ±15V, ±24V provides power supply to the CPU and its auxiliary circuits, control circuits, display panels, etc.
Driver board
First of all, the PWM pulse generated by the CPU is generated by the drive circuit to generate a drive signal that meets the requirements to excite the IGBT output voltage.
Control board
Also called a CPU board, it is quite a part of the human brain that processes various signals and controls programs.
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Precautions for storage of Delta inverter VFD-VE
It must be placed in a ventilated, dust-free, dry place.
The ambient temperature of the storage location must be in the range of -10°C to +40°C
The relative humidity of the storage location must be in the range of 0% to 90% and be free of dew.
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Precautions before installation of Delta inverters
Delta's inverter should be thoroughly inspected for initial installation or long-term use. The items and methods to check are as follows:
1) Check whether the Delta inverter is damaged, whether the metal parts are rusty, and whether there is frost. If there is frost and condensation, it should be dry for 4 hours (60°C) or in ...
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A brief introduction to Delta's inverters and their models
Delta's VFD drives have now established a wide range of brand awareness in the industrial automation market. Each series of products is designed for different operation needs such as torque, loss, overload, overspeed work, etc., and is adjusted according to different industrial machinery attributes; It can provide customers with a variety of choices, and a wide range of ...
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Delta's servo motor maintenance and safety measures
Delta's servo motor system is planned for industrial use, and it is necessary to have a sufficient understanding of the motor standards and operation manuals before operating the motor. For the safety of the operator and equipment, and to ensure that the motor can be used correctly, please read this safety precaution carefully before installing the machine.
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Introduction to common models and parameters of Delta touch screens
There are many types of Delta contact screens, of course, the parameters of different types are different, and the most important product is DOP-B03S201. This product is a 4.3-inch screen, its aspect ratio is 16:9, the screen is made of TFT raw materials, and its resolution can reach 480X ...
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TIMTOS x TMTS 2022 - Delta's Exhibit Highlights
Intelligent machining solution plan
Intelligent machinery is an important step towards intelligent manufacturing, in order to help manufacturers improve productivity or complete a few diverse forms of production, Delta will exhibit the intelligent processing solution plan at TIMTOS x TMTS 2022, which will be used to communicate with industrial-grade managed Ethernet networking.
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Debugging method of Delta servo motor
1. Initialize parameters
Before wiring, initialize the parameters.
On the control card: select the control method; Reset the PID parameter to zero; When the control card is powered on, the enable signal is closed by acquiescence; Save this condition to make sure that the control card ...
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Application of Delta A2 servo on packaging twisting machine
Double-end twisting machine is a more traditional sugar block packaging machine, it is widely used in small and medium-sized sugar block production enterprises, with a high degree of automation, which can not only complete the packaging of single or multi-layer paper, but also can package a variety of shapes of hard candy or soft candy.
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Inverter selection point - Delta
1. When selecting the inverter, select the inverter with the appropriate control method according to the load characteristics
In addition to the inverter manufacturing process, it is also important to use the inverter's control method. The control methods of the inverter are mainly divided into two types: open-loop control and closed-loop control. In the meantime, the open-loop control method ...
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Precautions for summer maintenance and maintenance of inverters - Delta
1. Check the operating status of the inverter, whether the voltage and current value during operation are within the normal range.
2. Carefully monitor and record the ambient temperature of the frequency conversion room, and the ambient temperature is generally between -10 °C and 40 °C. The temperature rise of the phase-shifting transformer should not exceed 130°C.
3. Avoid ...
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The parameter that needs to be set for the inverter - Delta
There will be some difference between the parameter setting of the inverter at the factory and the requirements of practical application. Therefore, the reasonable setting of the inverter parameters is directly related to whether the inverter can be used normally, which is of decisive significance.
General-purpose inverters generally have dozens or even hundreds of functional parameters.
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The impact of inverter cable design on the life of motor cables
Reflected waves that affect the impedance mismatch between the cable and the motor are pervasive in all AC VFD applications. The severity of the problem depends on the length of the cable, the rise time of the PWM (Pulse Width Modulation) carrier, the voltage of the VFD, and the magnitude of the impedance difference between the motor and the cable.
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How does Delta inverter adjust the frequency?
Delta's frequency modulator frequency modulation is mainly operated on the control panel, and the process:
1. Press the Menu button to enter the parameter programming menu,
2,P0.01=1,Enter this parameter to complete the correction frequency of the panel button, ...
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Delta inverter password
The inverter of Delta's brand A series locks the keypad to correct the parameters, forming that most of the parameters cannot be corrected, and the manual does not clearly explain how to unlock the keypad lock, press MODE and RESET together to display P256 (P256 does not explain what it means in the manual), press ENTER...
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Introduction to Delta's RH series switching power supply
Delta's RH series switching power supply, RH series switching power supply is a high-quality power supply product series planned by Delta Power for industrial applications, with the characteristics of high rate, high reliability and high function. This series of products has a wide range of input voltages and can be applied to a variety of power input ...
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Inverter technology is a motor control method – Delta
When you are using the motor, if you simply change the frequency, your motor will most likely be burned out. This problem is especially acute when the frequency is reduced. In order to prevent the motor from burning out, the inverter must change the voltage at the same time as the frequency.
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The importance of harmonic control - Delta inverter
With the rapid development of the electronic and electrical industries, the demand for magnetic materials has promoted the world's huge industrial clusters. In the process of producing magnetic materials, many manufacturers are facing a great dilemma: the production of magnetic materials is mainly controlled by thyristor rectifier furnaces such as bell furnaces and nitrogen rotary furnaces.
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The basic control loop of Delta's inverter
There are two fundamental circuits for communicating with external signals: analog and digital:
1. 4-20mA current signal loop (imitation); 1 - 5V/0 - 5V voltage signal loop (imitation).
2. Switch signal circuit, inverter start and stop command, forward rotation command, etc.
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Problems in the inverter application – Delta inverters
1. Harmonic problems
The equipment that plays the role of switching in the main circuit of the inverter must generate harmonics in the process of turning on and off the circuit. The lower harmonics generally have a greater impact on the motor load and cause torque ripple; The higher harmonics increase the leakage current of the inverter's output cable, making ...
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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
Solution:
VFD does not respond to Keypad's communication commands.
1. Confirm the communication quality of the communication wiring and contacts.
2. Please use the RESET key to clear the Fault ...
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