About Siemens inverter fault repair case - four bars

Fault phenomenon

In the process of using Siemens frequency inverters, four bars (----) are often displayed. The operation panel of Siemens inverters cannot display normal data, and no error codes are displayed. Siemens inverters cannot Drag the motor to run. This kind of trouble has not received any information about the failure. It is not easy for people who are not familiar with the maintenance of the frequency converter or who are not familiar with the working principle. It is not easy to perform maintenance and there is no sense to start! The four-bar bar fault repair ideas, maintenance methods, and maintenance steps are briefly explained.

Cause Analysis

Siemens Inverter shows the reasons for the failure of four bars. Four crossbars can appear on the inverter's operation panel. At least Siemens inverter switching power supply part is basically normal, so it is not necessary to check under the switching power supply; according to the operation panel can not display the normal data, The majority of faults are caused by the main control board, I/O interface board, operation panel, or connectors. Check the main control board, I/O interface board, operation panel, or connectors one by one. section.

Tiantuo Quartet is an authorized service center of Siemens. It has a professional talent team and maintenance equipment, professional Siemens inverter maintenance, touch screen repair, plc maintenance and other services. In 2016, Siemens officially distributed warranty repair services of A-F size G120_PM240, G120C and MM4 to authorized ESP service partners. Since then, customers in Shaanxi, Henan, Gansu, and Ningxia will enjoy local professional services provided by Tiantuo Quartet.

Repair steps

Siemens inverter repair ideas and repair procedures for the four bars fault phenomenon. Siemens inverter manufacturers design each part separately and made into each module, which provides great convenience for inverter maintenance personnel. We can use this convenience to carry out fault inspection. The method is to replace the bad unit module with a good unit module. If the good unit module is installed on the failed Siemens frequency converter, the inverter recovers the normal state that the replaced module is faulty and repairs the faulty unit module. It is possible to omit some fault determination processes. If a good unit module is installed on the failed Siemens frequency converter, the inverter still cannot work normally, indicating that the replaced module has no fault and should continue to check other suspicious parts.