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8447370000 Datasheet(PDF) 3 Page - Weidmuller |
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8447370000 Datasheet(HTML) 3 Page - Weidmuller |
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3 / 58 page  158 2-way-isolation separates the signals galvanically and decouples the measurement circuits. In so doing it eliminates potential differences caused by long cable lengths and common reference points. Furthermore, the galvanic isolation offers protection against destruction by overvoltage, and against inductive and capacitive interferences. 3-way-isolation also decouples the supply voltage from the input and output circuits, and enables the function with only one operating voltage. The passive isolator offers a further elementary advantage; it needs no additional volt- age supply. The supply to the modules ensues via the input circuit and is the trans- ferred to the output. This current loop supply is distinguished by very low power con- sumption. There are a large number of products available for measuring temperatures. RTD PT100 signals, in 2-, 3- and 4-wire technology, are converted to standardised 0 – 20 mA, 4 – 20 mA and 0 – 10 V signals. The modules which can be connected to commercially available thermocouples have cold junction compensation as standard. Furthermore, the modules amplify and linea- rize the voltage signals from the thermocouple. This guarantees an exact conditioning of analogue signals by eliminating sources of interference and errors. Frequency converters convert frequencies to standard analogue signals. This enables controllers connected in series to directly process impulse trains when making speed or rotational speed measurements. It is inconceivable to think about automation without analogue-digital-analogue converters. To bring together the aforementioned analogue form of describing the envi- ronment and the customary digital processing, within the framework of process moni- toring, it is necessary to convert analogue signals into digital signals. Weidmüller offers modules for the following standard input and output signals: 0...20 mA, 4...20 mA and 0...10 V. 8-bit and 12-bit digital modules are available. All modules have an added input for making instantaneous measurements. Current monitoring modules enable the monitoring of current values up to 60 A in alternating or direct voltages. Over range or under range values trip the switching out- put. Modules with analogue outputs enable the continuous monitoring of currents via connected controls. Voltage monitoring modules can be used to monitor direct and alternating voltages. Voltage fluctuations, resulting from switching operations or network overloads, can be reliably recognised and reported via the adjustable threshold function. Modules for monitoring of revolutions and torque enable the control of cyclic move- ments on conveyor belts, ventilators and pumps. The output responds after a set amount of time, should the expected impulse not be received. The reliable potential- free relay contact, signalises the interference to the responsible component group. Analogue Signal Processing |
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