CHAPTER 4
38 Hawkeye Nozzle Control Operation Manual
MAX PWM PERCENT
Enter a maximum PWM percent to set the maximum desired output for a pulse width modulated (PWM) hydraulic
control valve. This setting limits how far the PWM valve will open. The maximum operating pressure of the
Hawkeye nozzles is 80 PSI.
With the machine section and master switches in the on position, increase this value until the maximum desired
pressure is reached in a liquid system.
STANDBY PUMP PWM PERCENT
Enter the desired pump PWM duty cycle percent when all sections are off. This is utilized when standby pressure
control is not available (direct injection with a carrier check valve is installed). The default value is 42%.
PUMP PWM FREQUENCY
Used to set the coil frequency of the PWM valve (default is 60 Hz). Refer to the PWM control valve manufacturer
specifications for recommended PWM frequency.
MINIMUM NOZZLE PWM PERCENT
Enter a minimum PWM percent to set the minimum desired output (zero point or shutoff point) for the Hawkeye
nozzle control valves. With the machine master switch in the on position, decrease this value until the minimum
desired spray pattern is reached in the liquid system. The default value is 25%.
NOTE: To help avoid under application or skips in coverage, review “Avoiding Skips with Hawkeye™ Nozzle
Control System” on page 71, and maintain the recommended application conditions.
METER CALIBRATION VALUE AND UNITS
Enter the calibration value for the flow meter used to monitor the Hawkeye system product flow. The flowmeter
calibration value and units are on the tag attached to the system flowmeter. Select the appropriate units for the
flowmeter calibration to ensure proper application system calibration information.
Raven flow meters use a meter cal in pulses per 10 gallons [37.9 L].
RESPONSE RATE
The response rate has a range of 1 to 100 and the setting determines how aggressively the target flow is controlled.
Increasing this value will cause the system to respond more quickly. Decreasing it will cause a slower response. If
the system is slow to reach the target flow value, consider increasing it. The default value is 50.
DEADBAND
Sets the allowable tolerance between the target rate and the actual application rate. Enter a value between 1 and 9.
A value of 1 equals a ±1% tolerance between the target and actual application rates where a value of 9 equals a
±9% tolerance. Default product control deadband is 1%.
CAUTION
Operating at an insufficient nozzle PWM percent
may result in under application or skips in
coverage.
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