Inverter repair precautions

The frequency converter is widely used, but you know, often the fault of the inverter is only a little, and the important thing about the repairer is to find the problem, deal with the problem in a targeted manner, and try to reduce the useless. Disassembly, especially to minimize the number of times the soldering iron is used. In addition to experience, it is necessary to have a correct view. The correct method can help the repairer to reduce the scale of the test from the inside and the outside, from the complex to the simple, and finally find out the fault and repair it properly. 1. Alarm parameter viewing method: The inverter will give corresponding error information for voltage, current, temperature, communication and other faults, and most of the inverters that use microprocessor or DSP processor will have special parameters. Save the alarm record for more than 3 times. 2. Analogy viewing method: This method can be an analogy of the same circuit itself, and can also be an analogy between a faulty board and a known good board. This can help the repairer quickly reduce the size of the view. 3. Substrate replacement view method: Use the spare circuit board or the same type of circuit board to confirm the problem, and narrow the view scale is a very effective method. 4. Blocking view method: Some problems are often difficult to discriminate in that area, and the method of blocking can simplify the messy problem and find out the cause of the problem faster. 5. Intuitive viewing method: It is to use the sensory organs of human hands, eyes, ears and nose to find out the cause of the problem. 6. Lifting temperature viewing method: This method is very effective for some special problems. Artificially warming or cooling some components with poor temperature characteristics, causing "disorders" or eliminating "diseases to find the cause of the problem." 7. Damage viewing method: it is to adopt some method, to revoke internal protection measures, simulate The condition of the fault damages the defective device. The device or area that is faulty is highlighted.
8. Tap and view method: use a rubber rod with insulation to strike a suspected defective part, if the fault of the inverter disappears or reappears It is very likely that the problem is there.
9. Flushing view method: Many special problems, sometimes no, if not, can not be distinguished and treated. At this time, it is possible to clean the circuit board with water or alcohol. At the same time, use a soft brush to brush the dust on the circuit board, rust, pay special attention to the local solder joints, the vias and the circuit close to the 0 volt copper layer should also be cleaned and then dried with hot air. Unexpected effect. At least it helps to use the observation method.
10. Principle analysis method: principle analysis is the fundamental method for troubleshooting, and other methods are difficult to see when they are effective. The basic principle is to start, look at it step by step, and finally find out the cause of the problem.