Specifications

Manual # 016-0159-894 Rev H 01/07
309
A P P E N D I X
E
CALCULATING CALIBRATIONS FOR LIQUID
AND
GRANULAR APPLICATIONS
To ensure that you are applying the proper amount of product to the field, you must
calibrate the valves used to deliver the product. Viper uses the valve calibration
number to control the response time of the control valve motor to changes in the
vehicle speed.
The following control valve calibration numbers are recommended for the valves
listed:
Each digit in the calibration number corresponds to a specific function of the valve.
The following functions apply to the digits in the valve calibration number:


 Valve Backlash digit: This is the first digit in the valve calibration number.


 Valve Speed digit: This is the second digit in the valve calibration number.


 Brake Point digit: This is the third digit in the valve calibration number.


 Dead Band digit: This is the fourth digit in the valve calibration number.
Valve Backlash Digit
This value controls the time of the first correction pulse after detecting a change in
correction direction. The values range from 1 to 9, where 1 is for a short pulse and
9 is for a long pulse.
Calculating
Valve
Calibration
Valve Name Calibration Number
Standard Valve 2123
Fast Close Valve 743
Fast Valve 743
PWM Valve 43
PWM Close Valve 43
Standard Motor
Control Node
123