13
Automatic Control
CONTROL BOX - CONFIGURATION
Set Performance Options and System Gain
Refer to the operator's manual for setting performance options that include laser beam strike
averaging, receiver LED's on or off, and control box LED's bright or dim.
Generally, linear gain is selected for valves that have spools with an aggressive or exponential
fl ow characteristics. Exponential gain is selected for valves that have spools with less aggressive
or linear fl ow characteristics. Linear gain is the default position. Machine stability and hydraulic
system reaction also infl uence the selection.
Presetting System Gain
Blade in Air Method:
Ensure valve set up switches are in run mode.
Set the machines throttle to normal operating RPM. Ensure the machine is on fl at ground.
Place the blade approximately 1 foot (0.3 m) above the ground.
Set up the rotating laser at a typical working range. If a selectable rotation speed is available, set
it to 600 RPM or faster.
Mount the receiver in its normal operating position to receive the laser.
Select an On-grade deadband (10) of approximately 1/2 of the jobsite tolerance. If working at
ranges that exceed 500 feet (150 m), this may be increased to compensate for the rotating
laser's beam "bounce".
Select manual control (4). Raise the blade to position the receiver at the lower edge of its vertical
reception range, but still receiving the beam. Select automatic control (4).
The blade and receiver will move towards on-grade. Note any overshooting of On-grade. Repeat
procedure for raise correction. Once again, note any overshooting of On-grade. Adjust the Valve
Gain switch (12) until there is one small overshoot for a full receiver length correction in either
direction.
Clockwise rotation - towards F - corresponds to a faster, but less stable correction.
Counterclockwise rotation - towards 0 - corresponds to a slower, but more stable correction.
Set the Valve Set-up switch (14) to Run Mode after completion.
A 5 second timer is also available for checking blade velocities. When set in
this mode, the raise or lower switch will activate the blade for 5 seconds when
the switch is held in the raise or lower position. The cylinder stroke can then be
measured. Ensure proper clearance when using the timer.
