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Being a Physics Engineer did not mean I stopped being an Electrician. 25% of my work has to do with finding and fixing electrical problems. A very strong point is that I know my way around in electrical drawings. If necessary I can easily make loop diagrams from the cabinet wiring, interconnection diagrams and field wiring. By doing this I will find mistakes without testing on the installation. This does not go well on drawings with coppast (see below) though! And of course after everything is connected correctly and tested, there might still come up ground faults or earth faults. Finding and fixing ground faults can be time-consuming, but I’m getting pretty good at this. Because I am a first electrician, I can fix the installation properly myself. Fact: A problem on a longtime running installation has most likely to do with the wiring or electrical installation! I now my way around on motor control centers (MCC) and have been involved on several site modifications. Very often I find higher voltages from MCC’s coming back into a 24VDC cabinet (start - stop commands). In my opinion this is not correct and not save! Updating drawings by hand is time consuming. If I have AutoCAD available, I can update the drawings a lot faster, and leave the final drawings on site! |
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Coppast On this web page I would like to introduce a new word. I hope this word will be an official technical word or term one day. The word is coppast and comes from copy & paste error. A coppast is made when someone behind the computer copies something and paste it somewhere else without modifying it correctly! This does not only involve electrical drawings, but all drawings made by computer. Examples -
Terminal blocks are copied from an old project, paste in the new project and the terminal numbers are not correctly adjusted. This will result in wrong connections in the field. -
A coppast in a P&ID will result in wrong installed instruments or actuators. Instrument technicians will search forever for something that does not exist. -
A coppast on interconnection diagrams will result in wrong cabling. Some cables are to short and need to be replaced. Wires, which are not right connected, might damage equipment. -
A point-to-point check with drawings that contains a coppast is invalid. 5. I saw a lot of coppasts since computer drawing was introduced. This was not happening when drawing were manufactured by hand or on a drawing table. On a drawing table you would not make those mistakes. On a drawing table you don't draw a line, but you connect a wire. It might be a good idea that anyone who wants to work with computers for making drawings has at least 5 years of experience on the drawing table. I would like to collect coppast examples on this page, so if you have something, contact me! 6-juli-06 |
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