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Manual No. 016-0171-122 Rev. I 43
Initial Set Up and Navigation
Spreader Constant and Product Density
Note:
The spreader constant and product density settings are required when the corresponding product
node or control channel will be controlling application of a dry, or granular, product. If the product
node or control channel is set to control application of a liquid product, refer to the Meter Cal(s)
section on page 42.
Spreader Constant
The spreader constant is used to calibrate the control system for the specific gate opening and belt
configuration for each product node or control channel configured for a dry or granular product application.
Note: Enter a value of zero for the spreader value when applying liquid products.
Standard Unit Rate Calculation. For Rates displayed in 1 pound increments, the formula to calculate the
spreader constant is:
Where SC = the Spreader Constant, L = Length of belt travel in inches per 1 revolution of the encoder,
GH = Gate Height in inches, GW = Gate Width in inches.
Metric Unit Rate Calculation. 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.
To enter the calculated Spreader Constant:
1. Touch within the Product Control area at the bottom of the main screen.
2. Make sure that Node 1 is selected on the CAN Controller Status screen and touch within the second data
display area, or the Product Control Settings area, on the CAN Controller Status screen.
3. Touch the spreader value displayed on the screen and use the on-screen keypad to enter the calculated
spreader constant value.
4. Repeat the above process for any remaining nodes or product control channels as necessary.
5. Touch OK to save the entered value or proceed to the Product Densities section to continue with the initial
set up process.
Note: It is recommended to check the calculated spreader constant with the procedure in the Simplified
Spreader Constant Calibration section on page 246. The Spreader Constant section on page 245
also contains the spreader constant formulas shown above and additional instructions for
performing catch tests to calculate the spreader value.
SC
311 040,
LGH× GW×
----------------------------------=
SC
18 000 000,,
LGH× GW×
----------------------------------=
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