Appendix B
250 Viper Pro Installation & Operation Manual
6. Compare this weight to the total volume displayed on the field computer display. Perform the following
calculation to refine the spreader constant, if desired:
Where OSC = the Old Spreader Constant, TV = the Total Volume and AW = the Actual Weight unloaded
and CSC = the Corrected Spreader Constant.
For Example:
Using an Old Spreader Constant = 228 [797], Total Volume = 2000 lbs [4400 kg] and an Actual Weight
Unloaded = 1950 lbs [4290 kg]:
English:
The new Spreader Constant is 234.
Metric:
Repeat this procedure until the weight of the metered materials equals the total volume value.
Spinner RPM
Application Type
Select ‘Spinner’ as the application type. If spinner is not displayed as an option for the application type, check
that a CAN control node capable of controlling spinner applications is connected to the CANbus.
Note: A product control node capable of spinner control is required to control the spinner RPM or speed.
If the spinner option is not displayed in the application type options, refer to Appendix D, Updating
CAN Nodes via the Viper Pro, for assistance with updating the control node.
Valve Type
Select the type of control valve on the machine used to control spinner speed.
OSC TV×
AW
------------------------- CSC=
228 2000×
1950
---------------------------234=
797 4400×
4290
---------------------------817=
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