Appendix B
246 Viper Pro Installation & Operation Manual
Metric Unit Rate Display
For Rates displayed in 1 kg increments, the formula to calculate the spreader constant is:
Where SC = the Spreader Constant, L = Length of belt travel in centimeters per 1 revolution of the encoder, GH
= Gate Height in centimeters and GW = Gate Width in centimeters.
For Example:
Given a Length of belt travel of 33 cm, a Gate Height of 18 cm and a Gate Width of 38 cm:
Enter 797 as the Spreader Constant if the field computer is set to display Metric units.
Simplified Spreader Constant Calibration
The following procedure steps through the Calibration Assistance wizard for the spreader constant.
1. Touch within the Product Control area at the bottom of the main screen.
2. Touch within the Product Control Settings area on the CAN Controller Status screen. The first Node Settings
screen will be displayed.
Note: The Spreader Constant Calibration Assistance button is only displayed if the application type is set
to Gran 1, Gran 2 or Gran 3. See the Application and Control Valve Type(s) section on page 40 for
more information on selecting the application type.
3. Touch the Calibration Assistance button. The Spreader Calibration prompt displays with the values
currently set for the product density and spreader constant.
4. Touch OK to continue the Spreader Calibration wizard.
SC
18 000 000,,
LGH× GW×
----------------------------------=
18 000 000,,
33 18× 38×
------------------------------ 797=
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