Raven Envizio Pro, Installation And Operation Manual

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Chapter 7
112 Envizio Pro™ and Envizio Pro II® Installation and Operation Manual
Prescription (Rx) Settings
If an optional variable rate application (VRA) key has been activated, the Rx Settings button will be displayed
on the Calibration Settings screen.
Touch the Rx Settings button to display the Rx Settings screen.
Zero Rate Shut Off. Enable the Zero Rate Shut Off option to allow the field computer to close product control
valves based on zones with a target rate of zero on the prescription map. Refer to Chapter 8, Software
Updates and File Maintenance , for more information on transferring prescription maps.
Note:
Enabling the Zero Rate Shut Off feature will affect all control channels.
Prescription (Rx) Look Ahead Distance. Enable the ‘Use Look Ahead Distance’ option on the Rx Settings
screen to set look-ahead values in units of distance rather than time for changing the prescription map rate
control zones.
Note:
The vehicle must travel at a constant speed while using the look ahead distance.
Enabling the look ahead distance option will affect all control channels.
Prescription (Rx) Look Ahead. Set the Rx Look Ahead setting to the number of seconds (determined by
speed) the field computer is allowed to scan in front of the current vehicle position. This feature may help to
compensate for the time it takes a valve to adjust to a different rate or to fully open or close.