Manual No. 016-3001-015 Rev. C 149
Advanced Settings and Features
7
For applications using a CAN motor control node to control an injected chemical, the dual flow percent value
sets the tolerance for error allowed between the flow switch and pump encoder before a flow alarm will be
activated. Enter a value between 0 and 100 for the allowable tolerance between the switch and encoder. For
example, set this value to 100 to disable the dual flow alarm or 0 to display an error any time the flow switch
and pump encoder do not match. The flow switch alarm activates when out of tolerance conditions have been
met for at least five seconds.
Note: The dual flow percent is replaced with a FER Cal value when operating a Raven Sidekick Pro™.
Refer to the Sidekick Pro Installation and Operation Manual for more information about operation
with the Viper Pro field computer.
When controlling a dual bed system in Gran 3 mode, the dual flow percent sets the tolerance between the belt
encoder readings before the dual flow alarm is activated. This alarm may be used to indicate that the belts are
moving at different rates or one belt is not moving. Enter a value 100 to disable the dual flow percent alarm or
0 to display an error any time the belt encoders do not match. The dual flow alarm activates when out of
tolerance conditions have been met for at least five seconds.
Off Rate %. The off rate percent value sets the allowable difference between the target and actual product
application rates. If a non-zero value is entered for this setting and the difference between target and actual
rate exceeds the set value for longer than five seconds, the Viper Pro will display an off rate alarm. Enter a
value of zero to disable the off rate alarm.
Low Limit. The low limit value sets the lowest volume per minute acceptable during application of a product. If
the flow rate drops below the low limit value, the field computer will stop closing the control valve and display a
flow alarm.
The field computer automatically adjusts the low limit value for active boom or implement sections. For
example, if a low limit of 4 is entered but only half of the total boom width is currently applying product, the
Viper Pro will only display a flow alarm if the volume per minute drops below 2.
Low Tank. The low tank value displays an alert when the volume remaining in a tank or bin is reduced to the
entered value. When the calculated volume remaining in the tank or bin is reduced to the entered value, the
Viper Pro will display an alert.
Note: To utilize the low tank alarm feature, an initial tank or bin volume must be entered for the
corresponding product node or control channel. Refer to Tank Volume section on page 156 for
details on setting the initial tank or bin volume.
The alarm condition is cleared either when all sections are turned off or if a new low tank value less than or
equal to the current calculated tank volume is entered. Enter a value of zero to disable the low tank alarm.
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