88
Operation
6. Lower the blast heads to the ground and turn
the oat switch to the ON position to engage
Hog Arm Float Mode. Do not begin blast-
ing operations without the Float Mode
engaged.
7. Use the joystick controls to move the blast
heads to the proper working position.
8. Make sure Forward is selected on Forward/
Reverse switch. Then rotate the Truck Speed
dial to set the forward speed to a speed slightly
faster than the estimated speed necessary to
perform removal.
NOTICE:
YOUR INITIAL FORWARD SPEED SETTING SHOULD
ALWAYS BE SET TO A SPEED SLIGHTLY FASTER THAN
THE ANTICIPATED BLASTING SPEED TO REDUCE THE
POSSIBILITY FOR PAVEMENT DAMAGE AS BLASTING
BEGINS.
9. Release the brake. The truck will begin moving
forward toward the start point.
10. When the truck is approximately 12 inches
ahead of the start point, press the START
button on the joystick console to close the
diverter valve, supplying high pressure water
to the blast heads. Remember, never close
the diverter valve while truck is sitting
still with the blast heads on the ground.
11. Use the speed dials to adjust head rotation
speed and truck forward speed to obtain
maximum productivity and the desired prole.
12. To stop blasting, press the STOP button on
the joystick console to open the diverter valve
and stop high pressure water ow to the blast
heads. Remember, never supply high pres-
sure water to the blast heads when the
truck is stopped.
PLC and Spray Head Speed Control
The main screen on the PLC mounted to the joy-
stick console displays debris and clean water tank
levels, vacuum pressure and the rotation speed for
each spray bar. The maximum spray bar speed
(3000 RPM) is programmed into the PLC at the
factory to prevent the thru-shaft motors from
exceeding safe operating RPM.
Main Screen Display Showing Controls, Spray Head RPM,
Debris & Clean Water Tank Levels & Vacuum Pressure
Buttons at the bottom of the display are used to
set the desired maximum RPM for each spray bar
(0-3000 RPM), raise and lower the rotation speed
of each spray bar and turn spray bar rotation ON or
OFF. The operator can also select dierent screens
to change the PLC operation mode or program dif-
ferent preset maximum head speed RPM settings
into the memory.
Once the maximum head rotation speeds are set
or selected from memory, the spray bar rotation
speed can be raised or lowered between 0 and the
preset maximum RPM using the UP/DOWN arrow
buttons on the PLC or the Rotation Speed dial on
the joystick console.
Refer to section 2.12 Programmable Logic Control-
ler and the PLC User Guide for additional informa-
tion and operating instructions for the PLC.
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