RELIANCE 57C332A Pulse processing module

LVDTs and RVDTs are constructed in various configurations. All will have one pair of input wires to be connected to the SPC excitation output. There may be anywhere from one to four output wires requiring connection to the SPC RVDT/LVDT inputs. In this document, the “n” in “n-wire device” refers to the total number of device wires. In order to properly configure the SPC, the user must understand how the signals from the transducer are to be interpreted. For devices with two output coils, the device manufacturer’ s documentation should be consulted to determine what the input-to-output transfer characteristic is. The SPC uses the convention of assigning the letters “A” and “B” to the output coils.

Three-wire devices have no primary-to-secondary isolation

 which prevents the SPC open-wire detection circuit from functioning properly. The “Enable feedback open-wire checking” check box should be un-checked to avoid nuisance Feedback Open Faults.For the SPC, “+“ and “–“ designations are arbitrary, and polarity or phase markings on the device can be ignored. Take care with 4-wire devices, however, as the output voltage must not pass through zero volts within the normal actuator stroke. Four-wire devices are often constructed with two output coils wired together internally.

For the SPC, “+“ and “–” designations for the exciter are arbitrary.

 The (–) side of feedbacks 1A and 1B (or 2A and 2B) should be tied to the output center tap as shown. The device manufacturer’s documentation should be consulted to determine the output type. In the SPC, “A–B” denotes a transducer with a simple difference output. “(A–B)/(A+B) “denotes a difference-over-sum, or constant-sum output. This type of output is sometimes represented by the symbol below:For the SPC, “+“ and “–” designations are arbitrary, and polarity or phase markings on the device can be ignored. The device manufacturer’s documentation should be consulted to determine the output type . In the SPC, “A–B” denotes a transducer with a simple difference output. “(A–B)/(A+B)”

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