Automatic / Manual Stationary Knife Adjustment
Automatic stationary knife adjustment may be carried out: IMPORTANT: Automatic stationary knife adjustment may be stopped by pressing QUICK-STOP switch on multi-function lever. Readjust stationary knife each time the cutterhead knives have been sharpened. Adjust stationary knife twice each day, even if cutterhead knives are not sharpened. This will increase life of cutterhead knives and reduce power requirements. The adjustment of the clearance between the stationary knife and the cutterhead is crucial for the efficiency of the harvest operation. Adjusting the clearance too wide will result in an unacceptable quality of cut. Furthermore the cutting forces will become needlessly high which will result in a significant decrease of machine efficiency and thus harvest performance. For this reason, the forage harvester is equipped with an electronic control of the stationary knife clearance. The stationary knife adjust function complies with the following requirements:
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OUZXMAY,000045F -19-10AUG02-1/8 |
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Stationary Knife Clearance And Knock Sensors The stationary knife adjust process ensures that the stationary knife clearance is correctly set over the entire width of the cutterhead (the stationary knife is parallel to the cutterhead). IMPORTANT: Never modify the bracket for the knock sensors mechanically. On the forage harvester two knock sensors are mounted on a bracket. The shape and mounting location of this bracket is crucial for stationary knife adjust performance since it will provide a defined transmission behaviour for the stationary knife vibrations (acceleration) whenever the stationary knife contacts the rotating cutterhead. |
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OUZXMAY,000045F -19-10AUG02-2/8 |
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Automatic Stationary Knife Adjust Mode The following conditions have to be met for the activation of the automatic stationary knife adjust function:
Automatic stationary knife adjust mode will be entered by pressing the stationary knife adjust mode switch (A). If the electronic system has accepted the automatic stationary knife adjust request, the performance monitor will turn on the appropriate icons and status information. The automatic stationary knife adjust function will be a two step process that first sets a large clearance and then sets the proper stationary knife clearance. The system will first (and then continuously) check for conditions that will interrupt the process. Amongst other things, the following operations will provoke the interruption of the automatic stationary knife adjust process:
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OUZXMAY,000045F -19-10AUG02-3/8 |
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IVLOC The stationary knife adjust function will:
If the required cutterhead reverse speed is reached, the left stationary knife motor (A) will be turned on that the stationary knife moves towards the cutterhead. If the stationary knife is contacting the rotating cutterhead, knock signals will be generated by the knock sensors. If a preset knock signal threshold is reached, the electronic system will control the left stationary knife motor (with inversed direction of rotation) so that the stationary knife can be moved away from the cutterhead. In this situation the knock signal will decrease and when it falls below a preset knock threshold, the left stationary knife motor will further be controlled based on pulse signal information from the position sensor of the left stationary knife motor. Opposed to the knock signal based adjust process, this process will implement a time based adjust functionality. If the motor has been driven for a certain period of time (number of pulses), the electronic system will turn the left stationary knife motor off. After the left stationary knife motor has been turned off, the right stationary knife motor will be controlled similarly (as described for the left stationary knife motor). Applying the control logic described above, the stationary knife adjust function will alternately control the motors several times and while adjusting, actual process status information will be displayed by the performance monitor. |
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OUZXMAY,000045F -19-10AUG02-4/8 |
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The first process is called "large clearance setting process". The following process implemented by the automatic stationary knife adjust function is called "small clearance setting". The small clearance setting process will be similar to the large clearance setting process except that different knock signal thresholds and pulse presets will be applied for the control of the stationary knife motors. While setting the small clearance, actual process status information will also be displayed. If the automatic stationary knife adjust function has set the proper stationary knife clearance, it will automatically terminate the process. The termination of the process will also be indicated by turning off appropriate icons and status information on the performance monitor. Once the process has started, the system will continuously check for conditions that will interrupt the process. If such conditions do not exist, it will continue the process. If conditions exist, it will abort the process and generate appropriate diagnostic information that will be displayed by the digital info-trak monitor. The automatic stationary knife adjust process can be aborted by:
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OUZXMAY,000045F -19-10AUG02-5/8 |
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Manual Stationary Knife Away Mode IMPORTANT: Thoroughly clean area between smooth roll and stationary knife before stationary knife is set back - in direction of forward travel (X) - to ensure that stationary knife movement is not impaired. For the activation of the manual stationary knife away mode, the following conditions have to be met:
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OUZXMAY,000045F -19-10AUG02-6/8 |
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The manual stationary knife away mode will be activated by pressing and holding down the manual stationary knife adjust mode abort switch (A). If the manual stationary knife away request has been accepted by the electronic system, the performance monitor will display the appropriate icons and status information. While in this mode the electronic system will simultaneously turn on the left and right stationary knife motor as long as the switch is pressed. If the manual stationary knife away switch is released, the stationary knife motors will be turned off and the manual stationary knife away mode will be disabled. As opposed to automatic stationary knife adjust mode, the cutterhead will not be controlled in reverse direction while implementing manual stationary knife away mode. |
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OUZXMAY,000045F -19-10AUG02-7/8 |
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Calibration and Diagnosis The on-board diagnostic allows to read out status information for the manual stationary knife away switch and the automatic stationary knife adjust switch. |
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OUZXMAY,000045F -19-10AUG02-8/8 |