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Directional frequency inputs
7 I/O functionality
Instruction book, IQAN-MC3
Simple directional frequency sensor
The positive terminal of the directional frequency sensor is connected to the +VREF
and the negative terminal to the -VREF respectively. The sensor signals are connected
to the DFIN+ and DFIN- positions.
NOTICE
The negative terminal of the sensor must not be connected to the chassis.
Maximum load for VREF position, see Appendix A, on page 46.
Using directional frequency inputs in safety functions
The following addional information applies when the inputs are used in safety
functions, where an incorrect input signal can lead to an immediate increase of the risk.
EXAMPLE
Connect the positive and negative terminals of the frequency sensor to +VREF and
-VREF, respectively. Then connect the sensor signals to DFIN+ and DFIN-.
Connecting of directional frequency sensor to DFIN+ and DFIN-.
MC3-SMR-011:A Use of DFIN inputs in pairs
When directional frequency inputs are used in safety functions, the application shall
be designed so that the input signals are compared to an additional signal to ensure
that it is correct.
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