Raven Viper Pro Installation & Operation Manual page 150

Chapter 8
Meter Cal or Density. Depending upon the selected application type, either the meter cal or product density
setting will be displayed. See the Application and Control Valve Type(s) section on page 40 for configuring the
type of product application or the Meter Cal or Product Density section on page 240 for more information on
calibrating the meter cal or density values.
•
For liquid product applications, the meter cal must be entered to calibrate the Viper Pro to the specific flow
meter used to measure the flow of product going to the booms. The meter cal value is typically found on the
flow meter.
•
When controlling spinner or fan speed, the meter cal is the number of pulses detected per rotation of the
spinner or fan multiplied by 10.
Note:
A meter cal value is required to control spinner or fan speed. A fan cal value will only be used to
monitor fan speeds.
•
For dry or granular products, enter the density or weight of 1 cubic foot of product. This value is the density
of a dry or granular product entered for rate control. Refer to the Spreader Constant and Product Density
section on page 43 for more information on setting and adjusting the product density during a granular
product application.
Spreader. The current spreader constant value used by the Viper Pro control system. Refer to the Spreader
Constant section on page 245 for details on adjusting the spreader constant for the gate height or belt travel
measurements and adjustments.
Note:
Enter a value of zero for the spreader constant when applying liquid products.
Node Control 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 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 44 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 45 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 45 for more information on setting up the flow cal and gain values.
140 Viper Pro Installation & Operation Manual