Basic Electrical Troubleshooting Techniques Every Electrician Must Know Being an electrician, you know that sooner or later you will be dealing with a wide variety of complicated electrical drives and circuits which will break down and deteriorate when they age. There is great chance that you will be an expert in repairing said devices. But as you move onto the mastery level, it is best to gain knowledge on the basic techniques in troubleshooting those electrical devices. Kindly read on to get started. In industrial plants, you will find the solid-state electronic AC motor drive widely used. It has the power to control different devices such as pumps, mixers, conveyors, machine tools, air handlers and chillers. It may also be utilized to control a wide range of other electrical devices that are once utilized and powered through the DC. As is usually the case, the said damages on electrical devices are caused by the rectifier section, so it makes sense for an electrician like you to develop understanding on transistors, insulated gate bipolar transistors, diodes, and silicone controlled rectifiers. Talking of AC drives, the most popular used are the pulse width modulated inverter drives. It functions by converting the AC line voltage into a DC and then constructed again to become a variable frequency as well as a variable voltage output. The motor speed is most of the times dependant on the changing of frequency. In order to maintain the motor torque, the volts-to-frequency ration is set at a constant.
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Now, what do you need to do in order to fix a problematic motor drive? What makes this kind of problem much easier to settle and fix is the idea that most failures start and lie in the power sections and not in the circuit boards. The ordinary plant maintenance technician will not so much be exposed to drive failures which is why mastering in repairing circuit boards may not be easy to attain. A methodical approach has to be utilized in order to effectively and successful repair a troubled variable frequency drive or VFD. The divide-and-conquer method that is taught in almost all technical schools become handy when your knowledge about the device to be repaired is not that much.
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Always keep in mind that a good troubleshooter isolates the section that is not passing the signal first, and then work on it. It is even more necessary to remember that in the realm of troubleshooting a dead VFD quickly and effectively, you have to think of safety ahead of time. There can be charges remaining in the capacitors even when they have been plugged out.