PAPER MACHINE DRYER SECTION TUNING

Paper Machine Dryer sections create challenges in tuning due to gear backlash. The problem is amplified when older Paper Machines are upgraded with newer higher performance drive systems. The newer drive systems can achieve a much higher degree of control that can fatigue the mechanical drive train. Most often, backlash is experienced during the speed regulator tune-up. [1] The speed regulator response is modified in an effort to improve stability while in backlash. However, there are other tune-up considerations that must be taken into account. A Dryer Section can be pulled from downstream sections which can cause the Dryer Section applied torque to be near zero causing speed instability of the Dryer Section. This paper will investigate the cause of this instability and present a novel solution.