Jinzhou Hekang high voltage inverter maintenance one stop service provider

Jinzhou Hekang high voltage converter maintenance one-stop service provider

high voltage converter maintenance one-stop service provider of Jinzhou Hekang high voltage converter has been more and more widely used in recent years, so it is necessary to learn how to remove the major and minor faults. Now Shantou Luoke automatic converter maintenance center will show you how to deal with the major and minor faults of high voltage converter Law. How to deal with the light fault of Yunnan high voltage inverter maintenance: in case of light fault, the inverter sends out intermittent "sound alarm" and intermittent "fault indication". In the alarm state, when the frequency converter is under maintenance, modify the frequency converter system to cancel the "sound" signal according to the "alarm release" command. In case of light fault of frequency converter, the frequency converter will not be stored in memory. If the fault disappears, the alarm will be cancelled automatically. Maintenance method of Yunnan high voltage inverter for maintenance of major faults: when the inverter has major faults, the converter gives continuous "sound alarm", "high voltage emergency" and "emergency stop" instructions. The "alarm release" button can be used to clear the alarm signal, but the frequency converter keeps "high pressure emergency" and "emergency stop" command.



Jinzhou Hekang high-voltage inverter maintenance one-stop service provider makes each power unit meet the heat dissipation demand. At the same time, because the fan in the power unit blows away the hot air, it makes the cabinet at the air inletA strong negative pressure is formed in the body, and a large amount of cold air outside the cabinet enters the high-voltage variable frequency air, which cools the unit radiator through the power unit air duct. At the same time, due to the large amount of exhaust air from the top fan of the cabinet, a strong negative pressure is formed in the closed air chamber, which accelerates the hot air in the power unit to enter the closed air chamber, and then the high-voltage inverter cabinet is extracted through the top fan of the cabinet. Through the establishment of a tight and smooth air duct and the design of forced air cooling in the power unit, the heat dissipation capacity and efficiency of the heat dissipation system of the high-voltage inverter can be greatly improved. At the same time, the volume of the radiator and the volume of the power cabinet can be reduced, the miniaturization of the high-voltage inverter can be realized, and the space for the user to install the high-voltage inverter can be saved. The high-voltage inverter of air-water cooling system usually requires the operating ambient temperature to be - 5 ~ 40 ℃, and the ambient dust content is less than 950ppm. Too high temperature will cause the converter to overheat and trip.



Jinzhou Hekang high voltage inverter maintenance one-stop service provider universal high voltage inverter from the topological structure, mainly divided into unit series multi-level type, PWM current source type, three-level type, load converter type (LCI) several major categories. 1. Unit series multi-level inverter uses multiple low-voltage power units in series to realize high-voltage. The step-down transformer at the input side adopts phase-shifting mode, which can effectively eliminate harmonic pollution to the power grid. The output side adopts multi-level sine PWM technology, which can be applied to any voltage of ordinary motors. In addition, when a power unit fails, it can automatically exit the system The remaining power unit can keep the motor running and reduce the loss caused by shutdown. Systematic miningWith the modular design, the faulty power unit can be replaced quickly, so that if the user has a spare unit, he can carry out maintenance by himself. This converter can decide the number of series units according to the user's voltage, and can achieve any voltage output, so it is very suitable for the transformation project. As the speed decreases, the high efficiency section of the pump will move to the left. This shows that the speed control mode can still make the pump run efficiently at low speed and small flow.

Research on water supply mode under frequency conversion state

in the water supply system composed of multi-point and multi pump stations, it is necessary to control the pressure head at the outlet of the pump station in order to adapt to the pipe network system and achieve better system performance index, which can be divided into constant pressure water supply, variable pressure water supply and variable pressure water supply in different periods.

Constant pressure water supply

makes the outlet head of the pump station remain unchanged, which is the control goal of the system. In Figure 4, the outlet head is given as Hg.

When the flow Q changes, the head characteristic h1-q will move up and down due to the change of rotating speed, and the working point of the pump will move horizontally (a, B, C, d) on the H = Hg line. Although it can meet the requirement of flow rate, but because of the steeper resistance R, energy is wasted.

The constant pressure water supply system is easy to implement, and it is easy to coordinate with the medium and large-scale pipe network system of multi pump station water supply, which has certain universality and practicability. Therefore, some waterworks equipped with adjustable speed pump are willing to adopt this method. Under the constant pressure control mode, because the pressure head at the outlet of the pump station remains unchanged, there is one between the parallel characteristics of the pump and the actual characteristics of the load Definite differenceDistance, energy saving effect is not as good as variable pressure water supply system.

Variable pressure water supply mode

in order to save energy, the outlet head should be reduced (at least not increased) with the decrease of flow. At this time, the "variable pressure water supply" mode at the outlet of the pump station can be used, as shown in Figure 5. In the figure, because the head characteristic moves down when the speed drops, it intersects with the pipe resistance characteristic r1-q at point C, and the flow decreases from QA to QC (set the flow QC to be equal to QB under constant pressure control). The variable pressure control results in a large pressure difference H = HAC, thus saving energy as shown in Figure 5. Because the outlet head of variable pressure water supply is reduced, the loss approved by the change of pipe resistance characteristics and the additional loss of water pump are restrained, and the energy saving effect is significant.

Through the analysis, the frequency converter can optimize the water supply mode in the process of speed regulation of pump load, which has achieved better power saving effect




Jinzhou Hekang high voltage frequency converter maintenance one-stop service provider such as coordinated control between systems, cooling control and other complete technical services. After ten years of accumulation, the high-voltage inverter maintenance company has a high-quality scientific research and development team with rich experience and continuous innovation, a marketing team with the courage to work hard and forge ahead, and a professional, mature and efficient technical support engineer service team. Relying on the first-class technology of the National Key Laboratory of Tsinghua University, the company has constantly refreshed its achievements in the field of high-voltage inverter speed regulation. In the future, the high-voltage inverter maintenance company will, as always, adhere to the business philosophy of "leading technology, excellent quality and in place service", and strive to achieve the long-term goal of "high-voltage inverter speed regulation field enterprise"! article you may be interested in: the small edition of high-voltage converter maintenance tells you that IGBT is the key power device in high-voltage converter. As a high-power composite device, IGBT may lock when overcurrent occurs and cause damage. In order to improve the reliability of the system charge, we should take some measures to prevent damage due to over-current.

The company specializes in high-voltage inverter maintenance, providing high-voltage inverter power unit maintenance, high-voltage inverter field maintenance, overall custody operation, preventive maintenance spare parts sales. We have experienced maintenance engineers of high-voltage inverter. As the service team of high-voltage inverter in China, engineers of Baochuan automation customize the maintenance scheme according to different site conditions of users. It can provide customers with 24-hour on-site, 48 hours to solve the inverter fault service. The company charges reasonably and flexibly, and adopts the way of repair first and then payment.












Zhaotong City Schneider ATV61 converter maintenance

Zhaotong City Schneider ATV61 converter maintenance that is to say, different atoms will emit different photons, different wavelengths of light for people's feeling is different colors of light (table). That is to say, different atoms emit different colors of light. We use it as powerMaintenance often encounter problems described by customers about various on-site machines or UV lamps, which are lit by the output current of the machine power supply. If the power supply is not output. Or the output is not. It will cause the light is not on or other problems. You can consult us for power supply maintenance. There are enough accessories. The maintenance time is short. The reason why the maintenance light of the machine's lighter doesn't go out is that there are long arc lights. Because the lamp belongs to the lamp. It usually takes a few minutes to light up with a transformer. After the lamp goes out, it needs to be cooled for 5-10 minutes before it can be turned on again. So this kind of machine is designed to keep the lamp on for a long time. It takes minutes from the time when the lamp is off to the time when it is on again. It's impossible for you to expose it in minutes, and it also costs electricity. The life of the lamp equipment will also be affected.

(depending on the model) the inverter over-voltage protection acts. There are two main causes of inverter over-voltage: power supply over-voltage and regeneration over-voltage. Power supply overvoltage refers to the DC bus voltage exceeding the rated value due to the high power supply voltage. At present, the input voltage of most frequency converters can reach 460V, so the over-voltage caused by power supply is very rare. The main problem discussed in this paper is regeneration overvoltage. The main reasons for generating regeneration overvoltage are as follows: when the load of large gD2 (flywheel torque) is decelerated, the deceleration time of frequency converter is set too short; the motor is affected by external force (fan, draft machine) or potential energy load (elevator, crane) to lower. Because of these reasons, the actual speed of the motor is higher than the command speed of the frequency converter, that is to say, the rotor speed of the motor exceeds the synchronous speed, at this time, the slip rate of the motor is negative, and the rotor winding is cut and rotatedThe direction of the magnetic field is opposite to that of the motor, and the electromagnetic torque generated is the braking torque that hinders the rotation direction.







The main problems in the maintenance of Zhaotong Schneider ATV61 inverter are the 14 pin power supply of the chip and the 7 pin adjustment of the voltage reference value, The Danfoss inverter with 5-pin feedback detection and 2-pin waveform output uses a new pulse width integrated controller u2844 to adjust the output of the switching power supply. At the same time, u2844 also has current detection, voltage feedback and other functions. When there is no display, no voltage at the control terminal, 24V Fan does not operate and so on, we should first consider whether the switch power supply is damaged (generally u2844 or resistance is damaged). If it is unable to determine whether the power supply is faulty, it can be tested by external 24V power supply. If the test result is normal, it can be determined as power supply fault. The LCD screen of Danfoss 51 inverter displays the letter "14" alarm? NSP; the LCD screen of the inverter displays "lrm14" alarm

Siemens Inverter repairs F2 fault. Fault Name: DC bus overvoltage, which means that the DC bus voltage of the inverter exceeds the threshold of overvoltage. The causes of the over-voltage fault of the DC bus in the maintenance of Siemens inverter are as follows: the power supply voltage is too high (power supply fluctuation, operation over-voltage caused by other equipment on the power side). There are problems with load energy feedback (such as large inertia load deceleration, potential load or load mutation). There are problems in the internal hardware of the frequency converter (DC voltage detection circuit fault of the frequency converter, output side cable or motor grounding faultOr output side cable or motor terminal virtual connection). The common maintenance methods of Siemens frequency converter for F2 fault are as follows: the power supply voltage is too high; ① use a multimeter to measure whether the input voltage of frequency converter exceeds the allowable voltage range. ② Whether there is capacitor compensation cabinet put into operation on the maintenance site of frequency converter, and whether there are other devices on the site that cause the peak of grid voltage. Load energy feedback;








the maintenance of the ATV61 frequency converter of Zhaotong City makes the signal Mo close and makes the driver work in the mode (that is, under torque control, because the torque command input trqr is not connected, the motor output torque is, so as to realize off machine. In the CNC milling machine, we use the Panasonic AC servo under the analog control mode. The position signal is fed back to the computer processed by the pulse output of the driver. When the machine is debugged, it sends out the motion command and the motor flies. This phenomenon is caused by the positive feedback of the output of the drive pulse output to the computer / quadrature signal and the positive feedback. The + and - (or + and -) of the pulse output signal of the device are exchanged. . change the driver parameter No4 to change the phase sequence of its pulse output signal. In the test equipment we developed, we found that Panasonic AC servo system has some interference to our test device. Because the AC servo driver adopts the inverter principle, it is a more prominent interference source in the control and test system.

F001 fault, simple understanding: the current flowing into the motor of the converter exceeds the allowable value, a simple way to remove the output motor line of the converter. assumeF001 still appears after power on. Send it to the converter for repair. Don't bother about other places. If the fault disappears after power on, start the frequency converter to operate to 50Hz, and measure whether the output U of the frequency converter is about 400V and whether the three phases are balanced. If all are normal, the frequency converter is basically good. Strictly follow the troubleshooting methods provided in the operation manual one by one to eliminate the external faults of the frequency converter, such as whether the motor cable is grounded, short circuited, whether the motor is grounded and short circuited between turns, whether the load is too heavy, etc. And parameters. F002 fault and F003 fault, simple understanding: the voltage on the DC bus in the frequency converter exceeds or is lower than the safety value set by the parameter. There are many factors involved in this fault. When braking with large inertia load, the brake is damaged. If the relevant parameters are unreasonable, F002 may be reported, that is, bus overvoltage.