Raven Envizio Pro, Инструкция по установке и эксплуатации

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Chapter 7
108 Envizio Pro™ and Envizio Pro II® Installation and Operation Manual
Preset PWM. When operating with a PWM valve, the preset PWM value sets how far the valve will stay open
to maintain pressure in the system. When the master switch is off, the PWM pulse width will remain at the
existing value or go to the preset PWM value, whichever is lower.
When operating with a PWM close valve, the preset PWM setting is the initial target pulse width when the
master switch is turned on. If this value is set to zero, the pulse width will return to the last value when the
master switch is turned on.
Note:
If the Standby Pressure feature is enabled on the Feature Settings screen, the preset PWM value
will be replaced by the standby pressure value. Review the Feature Settings section on page 114
for more information on the Standby Pressure feature or see the Standby Pressure section on
page 108 for more information on setting the standby pressure value.
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 Feature Settings
section on page 114 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 Only) section on page 104 to adjust the
Sgain value.
Min PWM. Enter a Min PWM value to set the minimum desired RPM or hydraulic output (zero point or shutoff
point) for a Pulse Width Modulated (PWM) hydraulic control valve.
With the master switch in the on position, decrease this value until one of the following conditions is met:
•
The minimum desired flow is reached in a liquid system
•
The value when the belt stops moving in a granular system
PWM Frequency. This value sets the frequency of the pulses that are sent to the PWM valve. The default
value is 122 Hz for Raven valves, or a value specified by the valve manufacturer.