Seed Hawk Raven 2012 - Manual (Page 146)

Chapter 8
134 Seed Hawk® Viper Pro™ Installation & Operation Manual
Node Settings Screen (Page 2)
Touch within the Product Control Settings area and then select the Next button on the first Node Settings
screen to access the following settings.
Valve Cal. 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 36 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 C, Calculating the Calibration Values.
Note:
When operating a hydraulic drive system at extremely low seed application rates, the valve cal
may need to be adjusted to slow the PWM close valve and keep the seed rate from fluctuating at
these low rates. Refer to the Valve Cal section on page 240 for more information about adjusting
the valve cal.
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.
Refer to PWM Calibration Assistance section on page 241 for details on using the calibration
assistance to calculate the Min and Max PW values.
Node Settings Screen (Page 3)
Pre Set PW. Use the pre-set PW (Pulse Width) 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 booms or nodes are
turned on. When a value is entered in this field, the PWM output will not exceed this value when any sections
with a non-zero boom cal 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.
When operating with hydraulic drive systems, the Pre Set PW value may need to be adjusted for
low seed rate operations if the system initially applies too high of a seed rate when turning on
sections.