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Rev. B
Workman 200 Spray System Page 3.1 -- 11 Sonic Boom System (Optional Kit)
Rise in Turf Encountered
During sprayer operation with the sonic boom switch in
the automatic position (sonic boom light is illuminated),
the boom mounted sonic boom sensors continually
send impulsesignals andthen receiveechos as thesig-
nals bounce off the turf. The electronic control unit
(ECU) determines the sensor distance from the ground
basedon thetimebetweenthe sensor signalgeneration
and the r eceived echo. As long as the sensor height re-
mains the same as the calibrated height, the spray
boom section will remain at a fixed distance from the
ground for s praying accuracy.
Whena sprayboom sectionencountersa riseintheturf,
the time necessary for the sensor to receive the signal
echo is shorter than the calibrated timeframe. This
change in time causes the ECU to energize the ap-
propriate power switch relay and H--bridge relays.
These energized relays provide a current path to the
boom actuator causing the actuator to retract and the
boom section to raise. This maintains the boom height
at the calibrated distance from the ground. Once the
boom section is raised to the calibrated distance, the
elapsed time betweenthe sensor signal generation and
the received echo returns to the correct timeframe and
the boom stops raising.
Theboomsensortargetdistanceisinitiatedduringinitial
sonic boom calibrationand is typically set at twenty (20)
inches. When in automatic mode, the booms will not
move if the target distance change is three( 3) inches or
less (inner dead band). Once the target distance ex-
ceedsfive(5) inches(outer deadband),theECUwillen-
ergize the appropriate power switch relay. The
energized relay will lead to a change in boom actuator
length and ultimately a change in boom height.
Figure 5
RISE
A LOWER BOOM HEIGHT IS DETECTED
SO ACTUATOR RETRACTS TO RAISE BOOM SECTION