Rise In Turf Encountered - Toro Multi Pro 1750 Service Manual

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 impulse signals and then receive echoes as the
signals bounce off the turf. The Toro Electronic Con-
troller (TEC) determines the sensor distance from the
ground based on the time between the sensor signal
generation and the received echo. As long as the sensor
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 rise in the turf,
the time necessary for the sensor to receive the signal
echo is shorter than the calibrated time−frame. This
change in time causes the TEC to energize the appropri-
ate lift control manifold solenoid coils. The energized
coils provide hydraulic flow from the gear pump to the
rod end of the boom lift cylinder causing the cylinder 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 dis-
tance, the elapsed time between the sensor signal gen-
eration and the received echo returns to the correct
time−frame and the boom stops raising.
The boom sensor target distance is initiated during initial
sonic boom calibration and is typically set at twenty (20)
inches. If the boom target distance changes when in au-
tomatic mode, the TEC will energize the appropriate lift
control manifold solenoid coil(s). The energized coils
will lead to a change in boom lift cylinder length and ulti-
mately a change in boom height.
Multi Pro 1750
RIGHT BOOM SECTION RAISE SHOWN
LEFT CYLINDER
RETRACT TO RAISE
C2
S4
BOTTOM
COIL
S2
G
P
FROM
STEERING
CONTROL
VALVE
A LOWER BOOM HEIGHT IS DETECTED SO THE
LIFT CYLINDER RETRACTS TO RAISE BOOM SECTION
Figure 6
Page 9 − 11
RIGHT CYLINDER
RETRACT TO RAISE
(RETRACTING)
C1 C3 C4
S5
(ENERGIZED)
BOTTOM
COIL
TOP TOP
COIL COIL
(ENERGIZED)
S3
SH
OR
LC
T
TO OIL
FILTER AND
HYDRAULIC
RESERVOIR
Figure 5
RISE
Ultra Sonic Boom Kit (Optional)