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The Must-Know Electrical Troubleshooting Techniques for All Electricians As an electrician, you are expected to encounter a lot of electrical circuits and drives that will malfunction when they age. There is great chance that you will be an expert in repairing said devices. But while you are yet approaching for that time, it is recommended that you learn first the basic troubleshooting tips and techniques for such problems. Just go on reading in order to started right away. 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 control all other device that are used to be powered by 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. The pulse width modulated inverter drives are among the most popular kinds of AC drives today. What it does is convert the AC line voltage into a DC inside the converter section and then reconstruct it to be a variable voltage output again. Change in frequency can cause changes in the motor speed. The motor torque is then maintained by keeping into constant ration the volts-to-frequency.
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Now, how do you troubleshoot motor drives? Because most of the failures in the power section and not in the circuit boards, that will not be so difficult to fix. 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. It takes a methodical approach to be able to effectively troubleshoot a variable frequency drive. 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. Another very essential thing that you need to keep in mind is that a good electrician who looks forward to repairing a dead VFD quickly and efficiently takes into account the different safety measures that have to be used before, during and even after the troubleshooting process. There can be charges remaining in the capacitors even when they have been plugged out.