CHAPTER 2
6 SCS 440 Serial Interface Installation & Service Manual
The initial Speed Cal value for Phoenix 10 speed sensors is 785 [200]. After the initial console programming has
been performed, this value may be adjusted to optimize the system’s performance.
WHEEL DRIVE SPEED SENSORS ONLY
IMPORTANT: This procedure should be performed only after the entire system installation is complete. This procedure is
critical to the console’s performance, so measure carefully. This procedure should be performed on the
same soil conditions in which you will be spraying, since wheel circumference varies in soft soil versus hard-
packed soil.
FIGURE 2. Speed Cal Value Calculation
1. Place a chalk mark or tape on the tire on which the speed sensor is mounted.
2. Mark the spot on the ground directly below the chalk mark or tape.
3. Drive the machine straight ahead, counting 10 full rotations of the wheel.
IMPORTANT: The mark must stop at the same position (with the chalk mark or tape perpendicular to the ground at the
bottom of the tire) as before it was before the measurement began.
4. Measure the distance (in inches/cm) from the ground starting mark to the stopping mark. Round off fractions
of an inch/cm.
5. Write down this number as it will be used as the Speed Cal value when programming the console.
NOTE: Large tires and very low speed applications may require additional magnets to ensure accurate speed
readings. Any even number of magnets may be used as long as they alternate in color and are equally
spaced. After calculating the Speed Cal value, the number must be adjusted according to the actual
number of magnets used.
FOR EXAMPLE:
Normal Number of Magnets x Calculated Speed Cal = Adjusted Speed Cal
Actual Number of Magnets
4 x 1200 = 800
6
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