Seed Hawk Raven 2012 - Manual (Page 165)

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Manual No. 016-3001-003 153
Advanced Settings and Features
The zero rate tolerance feature may be used to eliminate encoder “chatter” due to these false rate pulses.
Each product may be set up with a different rate tolerance value to ensure each product is displayed
accurately on the coverage map and application report. On some machines, the main bin will supply a
relatively high volume of product and the tolerance may be set relatively high. Other bins that supply micro-
nutrients may apply material at a much lower rate and will require a lower zero rate tolerance value.
Setting the Zero Rate Tolerance.
1. To set the zero rate tolerance for each node from the Viper Pro main screen, touch Menu, then Setup,
Maps, and Cov Map.
2. Select the Next button on the Coverage Map Colors screen to display the Zero Rate Tolerance screen.
3. Touch the desired product field and use the on-screen keyboard to enter the minimum rate allowed before
the field computer will record coverage.
Prescription (Rx) Maps
Prescription (Rx) maps may be loaded onto the Viper Pro field computer for automatic variable rate
applications based upon rate zones referenced within the prescription map shapefile. The Viper Pro is capable
of controlling up to five products in reference to individual maps for each product or a single map containing the
prescription rate information for each product in the .dbf file of the shapefile format.
The following table is an example of the .dbf file for a single map that contains multiple product information.
Note:
In order to control multiple products according to a prescription map, a multi-product activation key
must be entered on the Viper Pro. Contact a local Raven dealer to obtain a multi-product VRA
activation key and refer to the Registering the Viper Pro section on page 21 for information on
entering activation keys on the Viper Pro field computer.
If the prescription map contains zero rate zones, the product node or control channel must have
either a PWM close or fast close valve controlling the corresponding product. Refer to the
Application and Control Valve Type(s) section on page 32 for information on setting the valve type
on the Viper Pro.
If the system contains a fast valve, the valve must be plumbed into the main product line. Do not
plumb the valve into a bypass line.
Nitrogen Potassium Phosphorus Lime
100.0 20.0 15.0 750.0
125.0 17.0 33.0 200.0
85.0 45.0 21.0 600.0
50.0 0.0 18.0 925.0