Chapter 7
158 OmniSeed™ Viper Pro™ Installation & Operation Manual
Valve Cal and Valve Cal 2. The valve cal value is used by the field computer to make adjustments to a
product or hydraulic control valve connected to the CANbus system. Refer to the Valve Cal(s) section on
page 50 for information on the recommend initial valve cal and valve cal 2 values. Instructions for refining the
product or hydraulic control valve using the valve cal values may be found in Appendix B, Calculating the
Calibration Values.
Note: If the dual loop control feature is enabled, the valve cal and valve cal 2 values will be replaced by
the “flow cal” and “pr sgain” (pressure system gain) values. Refer to the Dual Loop Control Cals
section on page 51 for details on setting and using these calibration values for field operations.
Flow Cal and Pr Sgain (Dual Loop Control Mode Only). The dual loop control feature uses a flow meter
and a pressure transducer to enhance the control response during operation at low application rates. The flow
cal and pr sgain (pressure system gain) values are used by the field computer to make appropriate
adjustments to the control valve and product pump via the CANbus system. Refer to the Dual Loop Control
Cals section on page 51 for more information on setting up the flow cal and gain values.
Valve Adv. (Advance - Standard, Fast, or Fast Close Valves). While in the automatic rate control mode, the
value entered in the valve advance field sets the time (in seconds) which the field computer will allow the
control valve to remain open after boom sections are toggled off. The valve advance feature is best used in
conjunction with the valve delay value to build up boom pressure for low rate product applications or with
valves with “flow back” features.
Enter a value between 1 and 9 seconds to enable the valve advance feature or a value of 0 to disable this
feature if a Fast Close, PWM, or PWM Close control valve is used for product control.
Note: For best results, approach headlands areas at a consistent speed while turning boom sections off.
The Valve Advance feature should only be used with Standard or Fast valves and the assigned
product control node must have software version 1.50 or higher. This setting must remain at zero
for products using a Fast Close, PWM, or PWM Close control valve.
Fan/Pump Cal. The fan/pump cal value is only used to monitor product pump speed during standard liquid
applications or to monitor fan or spinner speed during granular applications.
Enter the number of pulses detected per one revolution of the fan, spinner or pump shaft.
Note: The fan/pump cal value is only used to monitor the RPM of a fan, spinner or product pump. Refer
to the Fan Cal section on page 52 for details on calibrating the air cart fan sensors on the Viper
Pro.
Min PW. Use the Min PW (Pulse Width) feature to set the minimum desired RPM or hydraulic output (zero
point or shutoff point) for a Pulse Width Modulated (PWM) control valve.
Note: Refer to PWM Calibration Assistance section on page 257 for details on using the calibration
assistance to calculate the Min and Max PW values.
Max PW. Use the Max PW (Pulse Width) feature to set the maximum desired RPM or hydraulic output (zero
point or shutoff point) for a Pulse Width Modulated (PWM) control valve.
Note: Refer to PWM Calibration Assistance section on page 257 for details on using the calibration
assistance to calculate the Min and Max PW values.
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