Input Source; Test Mode - Omega FPD-4000 Series User Manual

Input Source

For versions with dual pick-ups, the sensor offers 5 different choices on the
frequency output lines; Signal 1, Signal 2, Signal 1+2, Direction, and Limits.
Signal 1 – Outputs frequency from pick-up 1 (leads signal 2 by 90° phase shift)
Signal 2 – Outputs frequency from pick-up 2 (trails signal 1 by 90° phase shift)
Signal 1+2 – Outputs 2x the frequency. Users using this output must multiply the
k-factor by 2
Direction – Outputs a high or low signal based on the flow direction. In forward
direction, sensor will output a high signal equal to the supply voltage. In reverse
flow direction, sensor will output a low signal.
Limits – Outputs a high or low signal based off the selected limit source, Total or
Rate.

Test Mode

The sensor comes equipped with a push button that allows the sensor to output
a set frequency on the signal output lines. There are 3 modes of operation,
indicated by the green LED on the board. (D2 for frequency boards and D4 for
analog and Modbus)
Mode 1 – Standard operating mode indicated with 1 green LED that blinks every
3 seconds
Mode 2 – Outputs 10 Hz frequency. For dual sensor versions, it outputs on both
signal outs with signal 1 leading signal 2 by a 90 degree phase shift.
Mode 3 – Outputs 50 Hz frequency. For dual sensor versions, it outputs on both
signal outs with signal 2 leading signal 1 by a 90 degree phase shift.
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