MICRO-EPSILON MSC7401, Руководство по эксплуатации

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Page 8
Safety
MSC7401 Miniature sensor controller for inductive sensors
2. Functional Principle, Technical Data
2.1 Functional Principle
The MSC7401 is a single-channel miniature sensor controller for the operation of LVDT inductive displace-
ment sensors (full bridge) and for half-bridge sensors.
An electronic oscillator excites the primary coil with an alternating current of a constant frequency. The fre-
quency and amplitude can be set for best operation mode of the respective sensors, see Chap.
5.
The demodulator electronics transform s the signal of the two (secondary) coils into the set output signal. With
the setting possibilities for zero point and gain, see Chap. 5. , the user can adapt the equipment to the task to
be performed.
If the plunger is moved into the sensor, this results in an increase of the output signal, if the plunger is pulled
out further, this results in a decrease of the output signal. Change the inputs sec+ and sec-, see Chap.
4.3
or adjust this accordingly in the controller, see Chap. 5.3.4 , if the output signal should decrease when the
plunger is moved in.
20 mA 10 V
6 V
2 V
0 % 50 % 100 %
Measuring range
12 mA
4 mA
Signal
Plunger
Sensor
Fig. 1 Measuring principle