Great Plains Raven 440 - Manual (Page 11)

2
Manual No. 016-0159-822 7
Introduction
Calculate the Meter Cal Value
No calculation of the Meter Cal value is necessary, since the flow meter calibration value is stamped on the tag
attached to each flow meter. Locate this number and write it down for future reference when programming the
console.
Calculate the Valve Cal Value
The Valve Cal figure is used to control the response time of the control valve motor to the change in the
vehicle’s speed. After operating the system, this number may be refined. The initial recommended control
valve values are:
• C-SD (standard valve) = 2123
• C-FC (fast-close valve) = 743
• C-F (fast valve) = 743
• C-P (PWM valve) = 43
• C-PC (PWM close valve) = 43
FIGURE 3. Valve Calibration Definitions
Digit Description Range Range Definition
Valve Backlash
Controls the time of the first correction pulse
after a change in correction direction is
detected (INC to DEC, or DEC to INC)
1 - 9
1 = Short Pulse
9 = Long Pulse
Valve Speed
Controls the response time of the control valve
motor. Caution: Running the control valve
too fast will cause the system to oscillate.
Refer to
specific valve Refer to specific
valve
C-SD Valve 1 - 9
1 = Slow
9 = Fast
C-F and C-FC Valve 0 - 9
0 = Fast
9 = Slow
C-P and C-PC Valve 0 - 9
0 = Slow
9 = Fast
Brake Point
Sets the percentage away from target rate at
which the control valve motor begins turning at
a lower rate.
0 - 9
0 = 5%
1 = 10%
9 = 90%
Dead Band
Allowable difference between the target and
actual application rate, where rate correction is
not performed.
1 - 9
1 = 1%
9 = 9%
C-SD Valve C-F or C-FC Valve C-P or C-PC Valve