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NRG Product Manual
Hybrid XT Vane
APPENDIX A: FG# 4715 – HYBRID XT TURBINE CONTROL VANE
Output Circuit Operation
The Hybrid XT vane provides a square wave output signal with a frequency proportional to the head rotation position.
The square wave amplitude is determined by the power supply voltage.
Power Supply Voltage
Power Supply Common
The frequency varies between 100Hz and 459Hz. At 100 Hz, the direction is 0 degrees and at 459 Hz the direction is 359
degrees (1 degree per Hz). Note that the output signal will equal 280 Hz (180 degrees) when the vane is aligned with the
rotor. If the frequency output is 0 Hz, this indicates a fault condition. The most likely causes would be: no power, wiring
problem, or a failed sensor.
If you were to look at the signal on an oscilloscope, you would notice that the rising edges fluctuate back and forth from
cycle to cycle. This is normal and was designed this way for Renewable NRG Systems factory use. This will not affect your
frequency counter in any way. However, if you are using a "time per pulse" measurement method you will want to
trigger on the falling edges only. For best accuracy, time and count many cycles then divide the count by the time for an
average frequency. This technique also effectively filters out short-term wind direction variations.
HybridXT_Vane_Manual
Rev 13.0
Variable Period
Output Frequency
Period
Vane Output Waveform
Output frequency proportional to wind direction
support@nrgsystems.com | Page 23
7 February 2017
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