Description; Operation - AUTOHELM Z219 Manual

ST80 Active Wind Transducer

1. Description

This section of the Maintenance Manual covers the servicing procedures
for the ST80 Active Wind Transducer, Product Code Z219.
The transducer measures wind speed and direction using an anemometer
cup assembly and a wind vane, each mounted on independent shafts at
either end of a pod containing electronic circuitry.
Electronic signals generated by an opto - electric integrated circuit and a
mechanical interrupter coupled to a shaft on which a cup assembly ro-
tates. When the cups are driven by the wind the generated signals are
converted into data representing wind speed.
The wind vane rotates on a shaft to which a magnet is attached. Hall effect
integrated circuits detect the position of the magnet in two orthagonal
axes, and the output signals of the circuits are converted to data repre-
senting the position of the wind vane.
Position and speed data are broadcast on the SeaTalk bus at one - second
intervals, thus becoming available to other elements of the system.
Parameters defining upper and lower limits of wind speed and angle, both
true and apparent, can be entered (through other elements of the system)
to cause alarms to be generated when a specified limit is exceeded.
Alarms are also broadcast on the SeaTalk bus at intervals of one second
while the alarm condition exists.

2. Operation

There are no operational activities required to prepare the Active Wind
Transducer for servicing.
ST80 Active Wind Service Procedures 83067-1 5