Manual No. 016-3001-015 Rev. C 159
Advanced Settings and Features
7
Node Control Settings Screen (Page 3)
Standby Pressure. When controlling a liquid product with a PWM valve selected (not PWM close), the
standby pressure value sets the pressure which the system will maintain in the product lines when the master
or all boom sections are toggled off.
Note: The standby pressure setting is only accessible when controlling products in liquid control modes
with a boom pressure transducer detected by the field computer. Refer to the Standby Pressure
section on page 151 for details. If the system pressure does not reach the set standby pressure, or
if the observed pressure oscillates, when the master switch is toggled off, the Sgain value will
need to be adjusted. See the Sgain (Pressure System Gain - Dual Loop Control Mode) section on
page 256 to adjust the Sgain value.
Pre Set PW. Use the pre-set PW (Pulse Width) setting to set an initial target pulse width value when using a
valve that is programmed in PWM Close mode. Enter a value between 1 (slow pulsed width) to 255 (full-scale
pulsed width). Viper uses this value to send an initial pulse width to the valve when the booms or nodes are
turned on. When a value is entered in this field, the PWM output will not exceed this value when any sections
with a non-zero boom cal are off.
When the pre-set PW value is set to zero, the initial pulse width will be equal to the previous state.
PW Freq. Enter the coil frequency of the PWM valve in this field. The default value is 122 Hz.
Ratio Rate. Enter a ratio rate value when using a product in an injection system that uses a hand-held spray
gun. The product is injected as a ratio to the amount of carrier product applied. For example, to apply 12.0 oz.
[0.35 L] of product with every gallon of carrier product, enter 12.0 [0.35] in this field. This function works in
manual rate control mode only.
This value must be set to zero (0) in a non-chemical injection application.
Valve Delay. Set the valve delay to include a time delay between when the sections are turned on and when
the product nodes start to control the flow rate. Viper Pro activates this delay if the time between turning the
section on and off is less than 30 seconds.
Note: A value of zero must be entered if a Fast Close or PWM Close valve is used as the control valve or
when the Valve Type is programmed as a standard valve with an injection system.
Appl (Application) Delay. The application delay is used with the product chaining feature when advancing to
the next bin in the product chain. Enter the time, in seconds, necessary for the product to travel from the bin to
the boom or spinner. The field computer will use the application delay for each product control channel to
ensure that product application is not interrupted and that the correct target rate is maintained when switching
to the next bin in the product chain.
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