Raymarine ST4000+ Owner's Handbook Manual

Also see for autopilot ST4000+: Owner's handbook Quick reference Service manual Owner's handbook Service manual

Contents

Raymarine ST4000+ Owner's Handbook Manual Manual pdf 96 page image

88 ST4000+ Wheel & Tiller Autopilots: Owner’s Handbook6 Setting-up the ST4000+Step 3 - Adjust the rudder dampingIf you have connected a rudder position sensor to a wheel driveautopilot system, adjust the rudder damping. Check the rudderdamping when your boat is moored dockside:• press auto and then +10• if the helm overshoots and has to drive back, or starts to hunt backand forth, you need to increase the damping level• adjust the damping one level at a time, and always use the lowestacceptable value.Step 4 - Adjust the rudder gainThe next step is to adjust the rudder gain, as described on page 85.Step 5 - Adjust the AutoTrim settingWhen there is a change in boat trim and/or sea conditions the boat willchange course. The autopilot will immediately apply rudder tocorrect for this. However, it may not apply sufficient rudder toovercome standing helm and bring the boat fully onto course. Over aperiod of minutes the AutoTrim function will apply more rudder untilit achieves the desired course.Increasing the AutoTrim level reduces the time the autopilot takes toget back to the correct course. But if the AutoTrim level is too high,the boat will snake around the desired course.You should gain experience with your autopilot before attempting toadjust the AutoTrim setting. On sail boats, you can only evaluate theeffect of AutoTrim while under sail.If you need to change the setting, increase the AutoTrim one level at atime and use the lowest acceptable value:• decrease the AutoTrim level if the autopilot gives unstable coursekeeping and the boat ‘snakes’ around the desired course• increase the AutoTrim level if the autopilot hangs off course forexcessive periods of timeStep 6 - Further adjustmentsYou may need to repeat these steps over a range of sea conditions anddifferent headings to achieve a good overall performance.81131_7.book Page 88 Wednesday, March 17, 2004 3:59 PM