Appendix B
260 OmniSeed™ Viper Pro™ Installation & Operation Manual
PWM Automatic Calibration
The automatic calibration mode will allow the field computer to automatically adjust the PWM output and
attempt to determine the minimum, maximum and preset values.
To use the automatic assistant mode, toggle the vehicle master switch and at least one section to the on
position. Touch the ‘Stop Cal’ button at any time during the calibration to stop PWM output.
Note: If calibrating the PWM smart control feature, the product must be set as a granular application with
a PWM type control valve.
The automatic calibration process may take up to two minutes to complete. Maintain sufficient engine RPM
and set the remote hydraulic flow to allow for at least 1 GPM [3.8 L/m] flow for each motor on the control
system. The field computer will display a prompt when the calibration process is complete. If the system fails to
calibrate properly, touch the ‘OK’ button and select ‘Start Cal’ again to restart the calibration process.
Meter Cal or Product Density
For liquid applications, the meter cal value is typically found on the flow meter. Enter the value found on the
flow meter to ensure the field computer is properly registering the product flow during product application.
For granular products, enter the product density or weight of 1 cubic foot [1 cubic meter] of product as the
density value. The density of the product must be entered to calibrate the field computer to the weight of
product being applied.
Flow Meter Service and Maintenance
Periodic maintenance of the flow meter may help to extend the effective service life of the flow meter or internal
components. If the flow meter does not register the applied product volume properly, the following steps will be
necessary to service the flow meter:
WARNING
The PWM valve output will increase and
decrease during the calibration process. Keep
away from areas where product may be
expelled and moving components and alert
anyone around the equipment when performing
the calibration process.
WARNING
Exposure to agricultural chemicals may be
harmful or fatal. Thoroughly bleed and flush the
application system lines prior to disassembling
fittings, hoses and the flow meter.
If the flow meter is used for applying anhydrous
ammonia, bleed the nurse tank hose and flush
the system with water before maintaining the
flow meter.
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