Multi Pro 1200/1250 Page 9 -- 9 Sonic Boom System (Optional Kit)
Downward Slope 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
sendimpulsesignalsandthenreceiveechosasthesig-
nals bounce off the turf. The electronic control unit
(ECU) determines the sensor distance from the ground
based on the elapsed time between the sensor signal
generationandthereceivedecho.Aslongasthesensor
height remains the same as the calibrated height, the
spray boom section will remain at a fixed distance from
the ground for spraying accuracy.
When a spray boom section encounters a downward
slopein theturf,the timenecessaryfor thesensorto re-
ceive the signal echo is longer than the calibrated time-
frame. This change in time causes the ECU toenergize
theappropriatepowerswitchrelay.Theenergizedrelay
providesacurrentpathtotheboomactuatorcausingthe
actuator to extend and the boom section to lower. This
maintains the boom height at the calibrated distance
from the ground. Once the boom section is lowered to
the calibrated distance, the elapsed time between the
sensorsignalgenerationandthereceived echo returns
to the correct timeframe and the boom stops lowering.
Theboomsensortargetdistanceisinitiatedduringinitial
sonicboom calibrationand istypically setat twenty( 20)
inches. When in automatic mode, the booms will not
moveifthe targetdistancechangeis three (3)inchesor
less (inner dead band). Once the target distance ex-
ceedsfive(5)inches(outerdeadband),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 4
SLOPE
A HIGHER BOOM HEIGHT IS DETECTED
SO ACTUATOR EXTENDS TO LOWER BOOM SECTION
Sonic Boom
System
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