Appendix E: Fg# 9363 - Hybrid Xt Push-Pull, Active-High Vane - NRG Systems Hybrid XT Vane Product Manual

NRG Product Manual
Hybrid XT Vane
APPENDIX E: FG# 9363 – HYBRID XT PUSH-PULL, ACTIVE-HIGH VANE
Output Circuit Operation
The Model 9363 Push-Pull Hybrid XT vane was designed as a direct replacement for 1- or 2-Channel PNP-type IceFree3™
wind vanes. It provides two output signals, in push-pull format. These outputs can source current when on and sink
current when off for compatibility with a wide range of controller inputs, including those designed for existing NPN or
PNP sensors.
The two signals are Yaw Right / Yaw Left, denoted VL, and the Upwind / Downwind signal, denoted VR90. This type is
active HIGH, where the FG #7894 is active LOW.

White wire == VL (yaw right/left)

Yellow wire == VR90 (upwind/downwind)
XT Vane Dithering
Most yaw vanes, including many OEM sensors, are under-damped. They move left and right continuously as the blades
pass the nacelle and other turbulence affects the sensor. Some turbine control systems depend on this motion, called
dithering, to allow them to estimate the average wind direction while observing only one digital signal. The wind vane
output is off when the vane is left of center, and on when the vane is right of center. In these systems, the controller
compares how much time the sensor indicates left and how much time the sensor indicates right. When the turbine is
correctly pointed into the wind, the vane will indicate left and right equally, and the on / off ratio is 50%.
HybridXT_Vane_Manual
Rev 13.0
support@nrgsystems.com | Page 28
7 February 2017