Seed Hawk Raven 2011 - Manual (Page 52)

Chapter 3
42 Seed Hawk™ Viper Pro™ Installation & Operation Manual
Valve Cal
Enter the appropriate valve cal value for the valve used to turn product application on or off. Raven
recommends using the following initial values for the valve cal.
For ground drive carts use the standard valve cal as a starting point. For hydraulic drive carts, enter the PWM
close valve value as a starting point. These values are good starting points and will generally yield adequate
results, however, the valve cal should be refined for the individual control valves installed on your specific
machine.
Note:
Refer to Appendix D, Calculating Calibrations for Liquid and Granular Applications, for more
information on refining the valve calibration.
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:
Min PW is not used with ground drive carts.
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:
Max PW is not used with ground drive carts.
Node Settings Screen (Page 3)
Pre Set PW
Use the Pre Set PW setting to set an initial target pulse width value when using a valve that is programmed in
PWM Close mode. Enter a value between 1 (slow pulsed width) to 255 (full-scale pulsed width). Viper uses this
value to send an initial pulse width to the valve when the sections or nodes are turned on. When a value is
entered in this field, the PWM output will not exceed this value when any non-zero sections are off.
When the Pre Set PW value is set to zero, the initial pulse width will be equal to the previous state.
Note:
Pre Set PW is not used with ground drive carts.
Valve Type Calibration Number
Standard Valve 2123
Fast or Fast Close Valve (C-F or C-FC) 743
PWM or PWM Close Valve (C-P or C-PC) 43
Motor Control Node (Select Standard Valve) 123