Heavy current engineering Angular position ... - Camille Bauer AG

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4 Camille Bauer Current Transducers Transducers for alternating current: Common features For the conversion of a sinusoidal alternating current into a proportional DC signal. Customer benefit • Determination of the variable load of lines and equipment • Identification of the utilisation ratio by a comparison with the nominal current • Output signal useable for indication, registration, monitoring and control • Safety by galvanic isolation and shock-proof terminals (IP20) Application The transducers for alternating current of the P-line are typically connected via current transformers, but can also be used for direct measurement. The measurement is effected within the instrument via current transformers which ensure galvanic isolation. The instruments are designed for sinusoidal alternating current signals. Possibly existing direct current portions are not concurrently measured. They provide an output signal in form of a direct current signal which is proportional to the measured current. The instruments can be easily snapped onto a top-hat rail (35 x 15 mm or 35 x 7.5 mm). Overview of instruments O = optional, S = standard Special features I542 I538 I552 Input Measurement of distorted alternating currents • RMS value measurement (standard) • 2 measuring ranges (standard) • • Adjustable maximum value of the measuring range O O S Without power supply (standard) • Nominal frequency 400 Hz (option) • Output Setting time 300 ms • • • Setting time 50 ms (option) • Adjustable output signal (option) • • Live-zero output signal (option) • • Power supply 2-wire technology with 4 …20 mA output (option) • For current measurement with sign programmable transducers of the DME4 or M56x lines may be used. Live-zero output signal In case of input signal zero the pertaining output signal is non-zero, by definition, e.g. 4 mA with a 4…20 mA output signal. This permits monitoring the instrument operation in a very easy manner since an output value of 0 mA clearly indicates an error. This might be the failure of the power supply or an absent input signal caused by an interruption of a signal line. 2-wire technology Transducers in 2-wire technology do not require a separate power supply connection. They are supplied via the output circuit. Instruments designed in this way must operate with less than 4 mA supply current but do not need separate electronics for the power supply. Short-circuiting of current transformers Conventional current transformers have a ferrite core. If the secondary winding of the transformer is open, it might carry high voltages, which will drive the current transformer to saturation. This might lead to flashovers and heat losses by eddy-currents and magnetic hysteresis losses which could cause a permanent loss in transformer accuracy. In extreme cases it is even destroyed. Therefore, the current input of the current transducer (and all other transducers with current inputs) should always be connected via short-circuiting terminals.
SINEAX I542 SINEAX I538 Transducer for alternating current To measure sinusoidal alternating currents, without power supply connection. Customer benefit • Without power supply connection, low wiring expenditure • Standard as GL (Germanischer Lloyd), suitable for ships Technical data Meas. input: 0…1 A / 5 A, 0…1.2 A / 6 A or customised (0…0.5 A to 0…7.5 A, only one measuring range), nominal frequency 50/60 Hz Meas. output: 0…1 mA, 0…5 mA, 0…10 mA, 0…20 mA or 0…10 V or customised (0…1 V to 0…
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