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234 Firmware Version 5.4
Spreader Control: PWM Control Valve
• PWM Frequency
The frequency that the PWM control valve is pulsed at.
Settings can be found from the manufacturer of the
valve. Typical settings range from 100-125 Hz. The
default setting is 100.
• PWM Gain
Determines how aggressively the control valve
responds when making rate adjustments. The higher the
value the more aggressive the system response is. The
default setting is 100.
• Zero Flow Offset
Represents the maximum duty cycle that is sent to the
control valve without producing any hydraulic flow from
the PWM valve. Using too high of a Zero RPM Offset value can cause the conveyor to not properly shut off.
See the PWM valve manufacturer information for recommended settings. The default setting is 30.
• Allowable Error
Determines the percent of error that is allowed prior to the product control system making any flow rate
changes.
2% - 3% is the normal dead band setting range.
- Too low of a setting value can cause the product control system to continually hunt for the target
application rate.
- Too high of a setting will cause excessive product application error.
• Shaft Speed Calibration
Calibration number representing the pulses that equal one revolution of the rate control metering system.
• Max Speed
The Maximum Conveyor Speed Setting determines the maximum RPM of the conveyor that controls
product distribution to the application point.
Sp
Spreader Control
Channel 1 Channel 2 Channel 3 Spinner
Control Valve Configuration
Servo
40 % 8 %
15
2 %
180 pls/rev
Max Speed
60 rpm
Valve
Response 1
Valve
Response 2
Response
Threshold
Allowable
Error
Shaft Speed
Calibration
reader Control: Servo Control Valve
• Valve Response 1
Determines the speed of the servo valve when product
control error exceeds the Response Threshold setting.
Represents the fast speed of the servo valve.
Decreasing the value will cause the servo valve to run
slower. The default setting is 40%.
• Valve Response 2
Determines the speed of the servo valve when product
control error is less than the Response Threshold
setting.
Represents the slow speed of the servo valve.
Decreasing the value will cause the servo valve to run
slower. The default setting is 8%.
• Response Threshold
Determines where the control channel switches between using Valve Response 1 and Valve Response 2
speed setting. Leaving all other valve control settings at the default value and making a small adjustment
to this setting is usually all that is required to fine-tune system performance. The default setting is 15.
Spreader Control
Channel 1 Channel 2
Control Valve Configuration
PWM
Channel 3 Spinner
PWM Frequency
PWM Gain
Zero Flow Offset
100
100
30
2 %
Allowable
Error
Shaft Speed
Calibration
180 pls/rev
Max Speed
60 rpm