Autohelm Inboard Autopilots (ST6000 and ST7000 systems) Service ...

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Autohelm3.3 Operating HintsResponse Level AdjustmentThe ST6000 has three response levels whichenable tighter course keeping to be achieved incertain cases:-Level 1 - Automatic Sea State ControlLevel 2 - Automatic Sea State InhibitLevel 3 - Automatic Sea State Inhibit andcounter rudder.When the autopilot is switched on, the responselevel is set to 1. This provides the bestcompromise between power consumption andcourse keeping accuracy and is suitable fornearly all situations.Increasing Response level provides tightercourse keeping at the expense of increasedpower consumption and general wear and tear.It is advisable to use the minimum responselevel necessary to achieve the desired coursekeeping accuracy. On larger power vesselslevel 3 can improve slow speed steering wherethe natural yaw damping of the vessel isreduced.Note: Level 3 is not recommended for use atplaning speeds or in rough seas.TrackTo make full use of Track control the followingsimple points should be observed:-• Always steer the vessel to within 0.1nm oftrack and bring the heading to within 5° of thebearing to the next waypoint before selectingTrack.• Always check that there are no navigationalhazards either side of the intended track.• Always maintain an accurate log withregular plots to verify the computed positionread from the Radio Navigation Receiver.• Maintain a proper lookout at all times.•Waypoint AdvanceIf the navigation receiver is transmitting thewaypoint number to the ST6000 the waypointalarm will sound whenever a new targetwaypoint is selected (see Page 9). When thealarm is sounding the ST6000 will maintain thecurrent heading and automatic track control issuspended. Check the displayed new bearing towaypoint and when it is safe to turn onto it,resume automatic track control by simplypushing Track.This accepts the new target waypoint and willsteer the vessel onto the new bearing towaypoint.The tidal offset may be very different on the newbearing, and it is good practise to check thecross track error after a couple of minutes. If thecross track error continues to increase make acourse adjustment of say 10 degrees in thedirection of the arrow. This will help the Trackcontrol correct more quickly for the new tidalvector.Automatic TrimIf Automatic Trim has been selected duringcalibration the ST6000 will correct for trimchanges. This correction can take up to oneminute to apply the rudder offset necessary torestore the set automatic heading. Large coursechanges which change the apparent winddirection, can produce large trim changes. Inthese cases the autopilot will not immediatelyassume the new automatic heading, and onlysettle onto course when the Automatic Trim hasbeen fully established.To minimise the inherent time delay thefollowing procedure may be adopted for largecourse changes.• Note required new heading.• Select Standby and steer manually.• Bring vessel onto new heading.• Select Auto and let vessel settle ontocourse.• Bring to final course with 1° increments.It is sound seamanship to make major coursechanges only whilst steering manually. In thisway any obstructions or other vessels may becleared properly and due account taken of thechanged wind and sea conditions on the newheading prior to engaging the autopilot.Rudder GainThe rudder gain level selected during initial seatrials will normally provide excellent steeringperformance over a wide range of conditions.However, it may be noticed that the autopilottends to be a little less stable on northerlyheadings in the higher latitudes of the northernhemisphere (and conversely southerly headingsin the southern hemisphere). This is caused bythe increasing angle of dip of the earth's12SeaTalk Service Manual
Autohelmmagnetic field at higher latitudes which hasthe effect of amplifying rudder response onnortherly (southerly) headings.Rudder Gain Adjustment (Sail) It is notnormally necessary to adjust the autopilotgain setting once the correct level has beenestablished during initial sea trials.Depending on the yachts individual steeringcharacteristics a change of one level mayimprove course keeping accuracy whengoing from northerly to southerly (increase)or southerly to northerly (decrease)headings.The effect may be judged by carrying out asea trial in smooth water conditions andobserving the results.Note: The effect is reversed for thesouthern hemisphere.Rudder Gain Adjustment (Powercraft) Thetendency towards northerly (southerly)heading instability is more obvious in highspeed craft and can be corrected by areduction in the rudder gain setting. Atspeeds in excess of 30 knots a reduction oftwo levels can be required on headingsbetween 315° and 045° (northernhemisphere) or 135° and 230° (southernhemisphere).Two options are available to control this:-• Manual (Low speed and displacementcraft) The rudder gain control may changeby one level when going from northerly tosoutherly (increase) or southerly to northerly(decrease) headings.The effect may be judged by carrying out asea trial in smooth water conditions andobserving the results.Note: The effect is reversed for the southernhemisphere.• Autoadapt (High speed planing craft)The ST6000 can be set to automaticallyreduce the effects of Northerly headinginstability. This feature is selected incalibration mode by entering the Latitude(see Installation Handbook, Calibration,section on 'Auto Adapt'). When selected theST6000 automatically adjusts the RudderGain depending on the compass heading,removing the need for manual adjustment.Rudder Gain/Speed Adjustment(Powercraft)High speed planning craft exhibit verydifferent steering characteristics when onand off the plane. As a result it is generallynecessary to adjust the Rudder Gain settingwhen going from displacement speed toplaning speed or vice versa. Two optionsare available to achieve this:-• AutomaticWhen the ST 6000 is used with anAutohelm ST50 Speed Instrument orTridata. Rudder Gain is adjustedautomatically with boat speed. There shouldbe no need for any manual adjustment.• Manual(No ST50 Speed/Tridata) The Rudder Gainsetting may be increased by one or twolevels when dropping from planing speed tocruise speed and decreased by the sameamount when returning to planing speeds,Note: It is important to make the gainadjustment after dropping to displacementspeed and before returning to planingspeed.Note: The adjustment of Gain with boatspeed is normally only required for highspeed planing powercraft.Unsatisfactory Steering PerformanceIf the ST6000 has been installed and set upin accordance with the instructions in theInstallation Manual it will provide excellentsteering performance over a wide range ofconditions.If performance drops but the autopilot is stillworking correctly, the following simplechecks should find the fault:-• Has a magnetic influence beenintroduced near the fluxgate compass? i.e.anchor, chain, radio equipment,loudspeaker, tools. generator etc. Checkthat the autopilot compass heading stillcorresponds with the steering compass.• Are all fuses intact, circuit breakersengaged?• Are all screw connections tight and freeof corrosion.SeaTalk Service Manual 13
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AutohelmAutohelm Inboard Autopilots
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AutohelmST7000 SystemMaster Table o
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AutohelmST7000 System IndexPage1. I
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Autohelm3. Operating/Calibration in
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AutohelmDisplay Key SequenceWatch A
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AutohelmUnsatisfactory Steering Per
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AutohelmWind Change AlarmWind Trim
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AutohelmAdjusting CalibrationIn cal
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Autohelm3. 5 Automatic Deviation Co
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Autohelm5. Track Control interfacin
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Autohelm6. Special functions.6.1 Di
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Autohelm7.1 Service Visit - Diagnos
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AutohelmContentsPage1. Description
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Autohelm5. When finally refitting t
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AutohelmLCD Display Assembly6SeaTal
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Autohelm8SeaTalk Service Manual
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Autohelm1. Control Unit PCB Circuit
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Autohelm3. Operation with non Autoh
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Autohelm1. Type CR Interface Box PC
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AutohelmZ131 Rudder Reference Body
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AutohelmFig. 1. Rudder Reference Un
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Autohelm3. Product History Rudder R
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Autohelm4. Product History (Z080 Ma
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AutohelmZ050 Mount Assembly6SeaTalk
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AutohelmContentsPage1. Linear Drive
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AutohelmSlide off the carrier assem
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Autohelm* No load current limits :-
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Autohelm7. Product History Type 2 L
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AutohelmContentsPage1. Rotary Drive
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Autohelmb) When rebuilding the clut
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AutohelmContentsPage1. Hydraulic Dr
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Autohelmc) If the relief valve asse
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Autohelm3. Reversing Gear Pumps (Z0
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Autohelm4. Type'0'Piston Pump (Z081
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AutohelmContentsPage1. I/O Drive Un
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Autohelm4. Spares numbers - I/O Ste
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Autohelm- Position the support plat
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Autohelm Inboard Autopilots (ST6000 and ST7000 systems) Service ...

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