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Chg Dir Stop
Chg Dir Stop
Minimum PW 80ms
Up PlsWdth 35ms
Down PW 25ms
CAUTION:
THE FOLLOWING ITEMS WILL OPERATE THE
HYDRAULIC VALVE. BE CAREFUL WITH THEIR USE!
MAKE SURE YOUR AREA IS CLEAR.
Minimum Pulse Width - EG Series needs information about
the hydraulic system on your machine, as all hydraulic systems
are not the same. Here we are telling the system the signal
needed to move the cylinder at its slowest speed. Pressing
the Power (Test) soft key will enter you in to this routine. Your
hydraulics will begin to move, use the Up/Dwn buttons to in-
crease or decrease the signal to the valve until you get a blade
movement of approximately 0.25 inches per second (1 inch
in 4 Seconds). Press the Power Chg Dir soft key to change
the direction, then adjust the cylinder speed for the opposite
direction. When the cylinder speed is OK then press the Menu
(Stop) soft key and these values will be stored. There may be
a need to enter different values for Up and Down to balance the
over all minimum speed. This is due to gravity helping in the
downward direction and the volume differences in the cylinder,
from the cap end to rod end.
Valve Gain - The span of error between the onset of valve
operation and the point at which the valve is fully open is deter-
mined by the valve gain setting. In this case, the units dis-
played (percentage) are arbitrary, but higher numbers suggest
more vigorous valve action. With the gain set to 100%, the
slightest error will fully open the appropriate valve. This setting
should be left at 50% until after the Minimum Pulse width has
been set and the hydraulics tested to see in which direction
you would like to adjust this setting. The higher the number the
more aggressive the hydraulic system. Conversely the lower
the number the less aggressive the hydraulic system will be.
Balancing PT Valve Servo - These three settings as well as
Valve Gain are important in Balancing the hydraulic servo.
The most important of the three is the Valve Dead-band, it must
be set to a realistic value that your machine’s geometry can
handle. The next in importance is the Minimum PW, this sets
the hydraulics systems slowest speed, if too fast the servo will
never have the ability to balance and control grade. The last
setting, Valve Cycle Time sets the over all cylinder speed. If
set too high the cylinder movements will be too large and the
servo will never be able to balance. Conversely set too low the
cylinder movements will be too small and a balanced servo will
not be achieved. A balance in these three settings while the
machine is working under it’s normal load should give you good
hydraulic control.
Note: Pressing the “Stop” soft key will turn off the valve
drive, and return you to the Minimum PW window. Also,
the valve will shut off automatically after 20 seconds with-
out any buttons being pushed.
Page 10
35% Next
Valve gain
125ms Next
Valve cycle time
Test Next
Minimum PW 80ms
0.5” grade Next
Valve deadband
