CHAPTER 4
28 ISOBUS Product Control Installation & Operation Manual
• The maximum spinner speed is achieved for spinner control systems.
NOTE: The maximum value for the Max PWM setting is 253.
MIN PWM
If a PWM type valve is selected as the valve type, enter a minimum PWM value to set the minimum desired output
(zero point or shutoff point) for a pulse width modulated (PWM) hydraulic control valve.
With the machine’s master switch in the on position, decrease this value until one of the following conditions is
met:
• The minimum desired pressure is reached in a liquid system.
• The value when the belt stops moving in a granular system.
• The value when the spinner stops rotating with spinner control.
NOTE: The minimum value for the Min PWM setting is 0.
PRESET PWM
When operating in PWM mode, the preset PWM value sets how far the valve will open to maintain pressure in the
system. When the machine’s master switch is off, the PWM pulse width will remain at the existing value or go to
the preset PWM value, whichever is lower. In PWM close mode, the preset PWM setting is the initial target pulse
width when the booms or nodes are 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.
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. Refer to Feature Settings section on page 29 for details.
NOTE: If the system pressure does not reach the set standby pressure, or if the observed pressure oscillates
when the master switch section is toggled off, the Sgain value will need to be adjusted. Refer to Sgain
(Pressure System Gain - Dual Loop Control Mode Only) section on page 26 for more information on
adjusting the Sgain value.
PWM FREQUENCY
This value sets the frequency of the pulses which are sent to the PWM valve. The default value is 122 Hz for Raven
valves, or a value specified by the valve manufacturer.
PWM OUTPUT DISPLAY
The PWM output display represents the currently programmed min and max PWM values as well as the current
PWM output of the valve.
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