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It is uncommon for engineers to build their own controller designs. For example, once the electrical designs are complete, they must be built by an electrician. Therefore, it is your responsibility to effectively communicate your design intentions to the electricians through drawings. In some factories, the electricians also enter the ladder logic and do debugging. ELECTRICAL WIRING DIAGRAMS In an industrial setting a PLC is not simply “plugged into a wall socket”. The electrical design for each machine must include at least the following components. transformers - to step down AC supply voltages to lower levels power contacts - to manually enable/disable power to the machine with e-stop buttons terminals - to connect devices fuses or breakers - will cause power to fail if too much current is drawn grounding - to provide a path for current to flow when there is an electrical fault enclosure - to protect the equipment, and users from accidental contact. An example of a wiring diagram for a motor controller is shown in Figure 31.1 (note: the symbols are discussed in detail later). Dashed lines indicate a single purchased component. This system uses 3 phase AC power (L1, L2 and L3) connected to the terminals. The three phases are then connected to a power interrupter. Next, all three phases are supplied to a motor starter that contains three contacts, M, and three thermal overload relays (breakers). A Motor Controller Schematic. PRACTICE PROBLEM SOLUTIONS 1. in a rack the defective card is removed and replaced. If the card has wiring terminals these are removed first, and connected to the replacement card.
Tags : electrical wiring diagrams, ladder logic, controller designs, defective card, electrical designs, wiring terminals, design intentions, overload relays, electrical fault, ac supply, phase ac, motor starter, motor controller, problem solutions, thermal overload
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August 5th, 2008 at 9:08 pm
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