Common faults and maintenance of abb inverter

ABB's frequency converter is imported from 1969, which can control the main parameters of the motor and accurately adjust the speed and torque of the motor according to actual needs. The following small series introduces the common faults and maintenance methods of abb inverter.

First, ABB frequency converter common faults

1, overcurrent fault

Overcurrent faults can be divided into acceleration, deceleration and constant-speed overcurrent. It may be caused by too short acceleration and deceleration time of frequency converter, sudden load change, uneven load distribution, output short circuit and other reasons. At this time, the inverter can be replaced by extending the acceleration and deceleration time, reducing the sudden change of load, adding energy-consuming braking components, designing load distribution, checking the circuit and so on. If the load inverter is disconnected or has an overcurrent fault, it means that the inverter circuit of the inverter has been looped.

2. Overload fault

Overload faults include frequency conversion overload and motor overload, which may be caused by too short acceleration time, too large DC braking amount, too low grid voltage and too heavy load. Generally, the acceleration time, braking time and grid voltage can be extended, and the load is too heavy. The selected motor and frequency converter can not drag the load, or it may be caused by poor mechanical lubrication. For the former, the high-power motor and frequency converter must be replaced. In the latter case, the production machine should be overhauled.

Second, ABB inverter fault analysis and maintenance

Inverter is a high-precision and high-tech electronic component. It is also necessary to repair its faults from simple to complex analysis. For our general field maintenance personnel, we don't need to know its internal structure deeply, but we need to master the law of its general faults to analyze and deal with them.

When the inverter fails, we should first read the fault code from the display panel of the inverter. The code information of each inverter will not be consistent, but basically there will be fault records such as overcurrent, overvoltage, overload, voltage loss, overtemperature, analog loss and communication loss. In ABB-ACS550 frequency converter, you can find historical fault records through 04 groups of parameters. At the same time, we can judge the general fault from the red light on the panel.

When analyzing the fault, we can also check the actual switching signal, analog signal and actual inverter operation data from the actual detection data of the inverter to judge whether it is normal or not. The inspection of such signal values of ABB-ACS550 inverter can be found in parameter group 0 1.

In addition, it is necessary to pay attention to whether the characteristic parameters of frequency conversion are set reasonably, especially to check and analyze the U/F curve, acceleration and deceleration time, current limit and various protection settings.

1, 1 DCS-controlled inverter, the operator set the operating frequency to 30Hz, and found that the actual motor speed was very slow, even stopped running.

Analysis and treatment: Because the original control is normal, it shows that the original external wiring and control mode should be no problem. The fault codes of the frequency converter are overcurrent and overload. The possible reason is that the load is too heavy. Judging from the feedback from the site, the motor is fine. Due to the change of process, the negative load of inverter increases and the current limit of inverter is normal. During the trial operation, check the operation parameters and find that the input switch value and analog data are normal. However, when the input analog value is about 30Hz, the output frequency will not go up, and the frequency converter will obviously start.

2. The1frequency converter often trips in operation and reports to the over-temperature alarm.

Analysis and treatment: Due to the normal operation of the inverter in the early stage, the over-temperature alarm trip is generally caused by the long-term full-load operation of the inverter, which can not fully dissipate heat. Check that the motor load is normal, but when the inverter is removed for inspection, it is found that the dust on the heat sink is very thick, which seriously hinders the heat dissipation performance of the inverter. After the dust is blown clean, the frequency converter returns to normal operation.

As can be seen from the example, our maintenance of frequency converter is not complicated. Some conventional small problems are not the problems of the inverter itself, but that we have not paid attention to its operating environment. What really burns out the inverter is the accelerated aging of its internal components under the premise that these environments are not guaranteed. Therefore, when we do maintenance at ordinary times, we should especially check the working condition of the inverter to keep the surrounding environment clean, waterless, corrosion-free and constant temperature.

Although all brands and models of inverters are not only the same, but also have mastered the commonness of inverters, after learning the application of one inverter, it will be similar to other inverters. We should learn to pick out the most basic parameters among the many parameters of the inverter, because most parameters are generally not used in our practical application, and we can use their default values, especially learn to adjust the characteristic parameters to make the inverter work in the best state.