Don’t worry about repairing bb inverter in Shanghai, Jincheng Electric will relieve your worries! ! ! Common faults of bb inverters can be repaired: no display, phase loss, overcurrent, overvoltage, undervoltage, overheating, overload, grounding, parameter errors, display but no output, module damage, etc. Shanghai bb inverter repair: etc. series
Common faults: Shanghai bb inverter repair - overcurrent fault
Overcurrent faults can be divided into acceleration, deceleration, and constant speed overcurrent. It may be due to the acceleration and deceleration time of the inverter being too short, sudden changes in the load, It is caused by uneven load distribution, output short circuit, etc. In this case, you can generally extend the acceleration and deceleration time, reduce the sudden change of the load, add energy-consuming braking components, carry out load distribution design, and check the circuit. If the load is disconnected, the inverter If it is still an overcurrent fault, it means that the inverter circuit of the frequency converter has gone into a loop and the frequency converter needs to be replaced.
Shanghai bb inverter repair - overload fault
Overload faults include frequency conversion overload and motor overload, which may be due to the acceleration time being too short, the DC braking amount being too large, the grid voltage being too low, the load being too heavy, etc. The cause can generally be caused by extending the acceleration time, extending the braking time, checking the grid voltage, etc. The load is too heavy and the selected motor and frequency converter cannot drag the load. It may also be caused by poor mechanical lubrication, such as the former. High-power motors and frequency converters must be replaced. If the latter requires maintenance of production machinery.
Fault Analysis and Maintenance
The inverter is a high-precision, high-tech electronic component. To handle its faults, we should also analyze and repair it from the simple to the complex principle. For our general On-site maintenance personnel do not need to have an in-depth understanding of its internal structure, but they should understand the rules of general fault occurrence and analyze and deal with it.
When the inverter fails, we should first read the fault code from the display panel of the inverter. The code information of each type of inverter will not be the same, but there will basically be overcurrent, overvoltage, Fault records such as overload, voltage loss, overtemperature, analog loss, communication loss, etc. In the bb inverter, historical fault records can be checked by group parameters. At the same time, we can judge a general fault from the indicator light on the panel turning red. When analyzing the fault, we can also check the actual switching signal, analog signal and actual frequency converter operating data from the actual detection data of the frequency converter to determine whether it is normal. The check of such signal values of the bb frequency converter can be done in the parameter The group checked. In addition, we should pay attention to whether the characteristic parameters of the frequency conversion are set reasonably. The settings of the parameters such as / curve, acceleration and deceleration time, current limit, and various protections need to be checked and analyzed in particular.
For the inverter controlled by the station, the operator set the operating frequency to 3 and found that the actual speed of the motor was very slow or even stopped.
Analysis and processing: Since the original control is normal, it means that there should be no problem with the original external wiring and control method. Check that the inverter fault code is overcurrent and overload. The possible reason is that the load is too large. According to the feedback obtained on site, There is no problem with the motor. Due to changes in technology, the load on the inverter has increased. Check that the current limit of the inverter is normal. Check the operating parameters during the trial run and find that the input switch value and analog value data are normal, but the input analog value is about 3 hours. , the output frequency cannot go up, it is obvious that the inverter has poor starting load capacity, adjust the curve/curve to increase the voltage when starting at low frequency, and troubleshoot.
The inverter often trips and stops during operation, and reports an over-temperature alarm.
Analysis and processing: Since the inverter was operating normally in the early stage, the over-temperature alarm trip is generally caused by the inverter operating at full load for a long time and unable to fully dissipate heat. Check that the motor load condition is normal, but when the inverter is removed for inspection, it is found The dust on the heat sink was very thick, which seriously hindered the heat dissipation performance of the inverter. After the dust was fully purged, the inverter returned to normal operation.
It can be seen from the example that our maintenance of the frequency converter is not complicated. Some common minor problems are not the frequency converter itself, but that we do not pay attention to its operating environment. What really burns out the frequency converter is not in these environments. Under the premise of guarantee, it is caused by the accelerated aging of its internal components. Therefore, we should especially check the working conditions of the inverter during daily maintenance. The surrounding environment should be kept dust-free, water-free, corrosion-free and constant temperature.
Wuxi Jincheng Electric specializes in repairing various types of BB inverters, and a warm reminder: Any inverter repaired in our company can provide a three-month free warranty. Manager Gao, Science and Technology Entrepreneurship Park, Changjiang Road, New District, Wuxi -/:
Frequency converter maintenance-Shanghai ABB frequency converter maintenance