Basic Electrical Troubleshooting - PdMA（基本电气故障排除- PdMA）.pdf

Basic Electrical Troubleshooting A boiler feed pump being powered by two 3500 HP induction motors appears to be developing a problem. Failure of this pump will result in the loss of a generator currently producing half of the station’s power output. Operators are complaining that a large compressor on several occasions has failed to start. A controller just doesn’t sound the way it used to. A cooling fan has developed an audible “beat” sound during operation. One of the most enjoyable aspects of working as an electrician is taking such compelling evidence as “appears to be developing a problem,” determining what is actually going on, and making a sound decision on the correct course of action. Successfully troubleshooting a complex piece of equipment gives a technician a tremendous sense of satisfaction. Having an effective troubleshooting plan and following it can help obtain this feeling of satisfaction. The following is a short discussion concerning basic electrical troubleshooting. It is a broad overview of what has proven to be a simple, but effective, method of investigating an electrical problem. Use this seven-step process to get yourself organized when presented with a complex problem. Seven-step process 1. Gathering information 2. Understanding the malfunction 3. Identifying which parameters need to be evaluated 4. Identifying the source of the problem 5. Correcting/Repairing the component 6. Verifying the repair 7. Performing root cause analysis 1. Gathering information is a logical first step in any troubleshooting endeavor. The saying “look before you leap” always holds true. Therefore, ask yourself about or perform the following: What technical documentation about the equipment is available? How exactly is the equipment supposed to operate? Are there any previous lessons learned? Review any material history that exists for the equipment. Identify si