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AC drive faults analysis

It will cause a series problems during AC drive operation in various environmental conditions, take an example as: when failure occurs, AC drives protective function is activated, and the AC drive tripped immediately, the electric motor stop slowly, the red LED alarm indication turns on, the display panel shows alarm message code or fault content. Then we can analyze the variable frequency AC drive fault reasons base on the display information, if it is soft failures, we can cut of the AC drive and reset it. If the drive still not works, we need to check it manually or automatic initialization, and input the parameter values after the initialization finished. In this way, the AC drive can work if the failure is not critical. If the AC drive still can't work after above detection, then we need to check the variable frequency drive damaged parts according to the fault phenomena, to replace components or circuit boards. Troubleshooting should follow the drives failure sequence. Like:

(1) Fault code 36, its main power failure, then the three-phase rectifier bridge modules may be breakdown shorted or opened.

(2) Fault code 14, its ground failure, check the motor windings and insulation with megger to see if it's damaged or not.

(3) Fault code 37, its the inverter failure, the IGBT module may short-circuit breakdown. If the IGBT module short circuit, the main circuit fuse will burnout too. When a phase gate damaged, the variable frequency AC drive will appear overcurrent phenomenon, then it's time to check the IGBT modules.

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