Mill frequency converter selector

1, a cement factory cement (Yaskawa 616G5/22KW, the set mode is panel control mode) frequency set to 32HZ start, frequency converter, the maximum 16HZ frequency no longer rise, the frequency converter no other fault display.

2, the scene saw the motor rotation is slow, slight tremor and accompanied by the motor "buzzing" sound. Out of the load, the frequency of the frequency converter rises normally, check the vertical powder machine, is the vertical shaft bearing is damaged, maintenance select the vertical powder machine bearing, the frequency converter works normally.

3, Yaskawa 11KW transducer

Fault phenomenon: there is no obvious open circuit in the main circuit and measurement before power on. After pressing the main loop, the display is normal, but there is no response when pressing the key.

Troubleshooting: Since the input key of the microprocessor keyboard is directly reached, and the working status of the inverter is directly displayed on the LED display, the fault may be in the control circuit and the power circuit. Check the rectifier filter circuit of the switching power supply is not abnormal, the CPU microprocessor board is relatively clean, check the clock and reset are no problems, and finally found a problem in the control panel - a key on the keyboard seriously short circuit. After the test, the short circuit was cleared and everything was normal.

Summary: Maintenance examples are not every inverter failure is a big problem, maintenance inverter and other equipment should also be checked from simple to complex rules, in this case due to the frequent use of keyboard keys failure, rarely appear in the inverter repair.

4, Yaskawa inverter 45KW maintenance

Symptom: The load is unstable and fluctuates.

Analysis and maintenance: the company's transducer normal test machine, no problem, detect three-phase current balance, the motor runs smoothly, the six-way trigger circuit trigger voltage is normal, and then test the DC output circuit phase, there is a diode leakage triggered again, the replacement is normal, stable operation with load.

Comments: This example of fault repair is relatively new ideas, and the operation of instability is generally caused by the output imbalance, but Yaskawa inverter this example is caused by the DC output, although the author did not specify what the direct current circuit is, but it should be inferred that the DC brake circuit caused the problem.

5, Yaskawa inverter maintenance

Fault symptom: When the machine panel is running normally, the control terminal speed is not only unable to run.

Fault analysis and maintenance: According to the fault phenomenon, use a multimeter to measure the power supply end FS given frequency end to FC voltage 0V, 15 volt voltage should be normal as normal, find A7 diode breakdown voltage along the loop, and return to normal after replacement.

Comments: The panel is running normally, the first reaction is not to give the CPU terminal signal. First find a given signal source, the signal behind has not really yielded, the author followed this idea quickly solved the problem.

The above content is Yaskawa inverter real maintenance case to share, I hope to help you. This article is provided by Shenzhen Oudejie Technology Co., LTD., the company specializes in the sale of imported Yaskawa inverter, and promises to sell products are new imported, while providing customers with quotation, selection, product information and other services.