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Subject: Analog-in, 4- or 8- relay out controller available?
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Date: 08/25/00 at 12:43 AM
Posted by: Gideon Coetzee
I need a controller relay to control a process (regenerative energy absorption of electrical locomotives at traction substations). As the voltage rises past certain preset levels, it should bring in relay contacts - up to 5 or 7 of them, depending on the substation installation. A certain amount of hysteresis is required before each relay falls out again as the voltage decreases. I know it can be done with a PLC, but my skills are zero and time is an issue. We also have some problems with the existing digital controllers, as they fail very often in the electrically harsh environment of a DC substation. I can use several single overvoltage detectors, but would like to bring down the number of components if possible. Isolation between the supply and measured voltages are very important.
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