Raven Envizio Pro, Инструкция по установке и эксплуатации

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Chapter 7
104 Envizio Pro™ and Envizio Pro II® Installation and Operation Manual
Flow Cal (Dual Loop Control Mode Only)
The flow cal value may be used when controlling a liquid application system using a PWM control valve. This
value sets how the system responds to rate control inputs while product is flowing through the flow meter. A
value between 11 and 999 may be entered for the flow cal value. The default value for the flow cal is 103.
Refer to the Flow Cal (Dual Loop Control Mode) section on page 195 for information on the components of the
flow cal setting or on refining the flow cal value.
Note:
Set the Sgain value prior to adjusting the flow cal value.
When adjusting the flow cal value, it is not recommended to adjust the last digit (i.e. ‘3’ in the
default value). Review the Flow Cal (Dual Loop Control Mode) section on page 195
for more
information.
Valve Cal 2
Note:
If the dual loop control feature is enabled the valve cal 2 value will be replaced by the Sgain value.
This value can fine tune control valve response and help control application rate oscillations when the console
is programmed in PWM mode.
When a fast close valve is selected, the valve cal 2 value is utilized to enable a high resolution rate control for
lower application rates. Enter a non-zero value for the time, in milliseconds, which the valve will be fully opened
before switching into high resolution control. For example, a value of 200 will give the valve a 200 millisecond
“burst” at a full 12 V to open the fast valve from the closed position before resuming product rate control. A zero
value will disable this feature.
Sgain (Pressure System Gain - Dual Loop Control Mode Only)
The Sgain value may be used when controlling a liquid application system using a PWM control valve. Use this
value to adjust how aggressively the application system responds to pressure changes in the application
system. The default setting for the Sgain value is 100. To adjust the system aggressiveness, enter a value
between 1 and 999 as necessary.
Note:
It is recommended to increase or decrease the current value in increments of 10 or less when
making adjustments to the Sgain setting. If the new value does not produce significant or notable
changes in the system response, increments of 20 may be used.
For example, increase the Sgain value if the observed product pressure increases too slowly or if the system
takes a long time to reach a set standby pressure or rate input change. If the system is consistently over
shooting a set standby pressure or oscillating around a target rate, decrease the Sgain value until the system
stabilizes.
Standby Pressure Sgain. The standby pressure feature may be enabled in either the standard or dual loop
control modes. When enabled in the standard control mode, the Sgain value is not displayed on the Valve
Calibration screen, but is still used to set the response of the system to the application system pressures.
Note:
Refer to the Feature Settings section on page 114 for information about enabling the standby
pressure feature on the Feature Settings screen.