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

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AutohelmContentsPage1. Description and Functional Test 32. Resetting Centre Position 33. Product History 7IllustrationsFig. 1. Rudder Reference Unit Standard Installation 5Fig. 2. Adjusting Centre Position 62SeaTalk Service Manual
Autohelm1. Description and Functional TestThe rudder reference transducer contains a single turn plastic potentiometer toprovide the course computer with rudder position information.With the rudder reference transducer disconnected from the connector unit, itsoperation can be checked as follows:-a) Connect an Ohmeter across the blue and red wires.b) Position the rudder reference transducer arm diametrically opposite the cablegland and check the reading is between 2.2 and 2.8K ohm.c) Slowly rotate the arm in both directions and check that the resistance increasesand decreases smoothly according to arm movement.A faulty rudder reference transducer is replaced as a complete unit.2. Resetting Centre PositionIt is important that the rudder reference transducer is correctly centred to ensure thatthe potentiometer output remains within the working range of the Analogue to Digitalconverter (1.0V to 4.0V). During assembly, the unit is set up to ensure that when therudder reference transducer arm is diametrically opposite the cable gland, the wiperis at its mid position. The installation instructions then direct the installer to mount thetransducer so that with the rudder amidships the arm is diametrically opposite thecable gland (see figure 31). Should it be necessary to install the transducer with itsarm in an alternative position to the cable gland, the centre position of thepotentiometer must be reset as follows (see figure 32).1. When the rudder is amidships, determine the orientation of the rudder referencetransducer arm to the cable gland.2. Remove the plastic base plug from the underside of the transducer and connect anohmeter across the red and blue wires.3. Remove the plastic cap from the top of the unit to gain access to the locking nut ofthe taper collet.4. Slacken the locking nut until the potentiometer shaft can be turned within therudder reference transducer cap.5. Position the arm as determined in 1. and rotate the potentiometer shaft with ascrewdriver until the meter reads between 2.4 and 2.6k ohm.6. While pressing the potentiometer and potentiometer mounting plate into the rudderreference transducer body, tighten the locking nut to clamp the potentiometer shaft tothe cap.7. Confirm the meter still reads between 2.4 and 2.6k ohm.8. Check that the total vertical movement at the end of the transducer arm is lessthan 1.5mm. If it is greater, steps 4. to 8. must be repeated ensuring that thepotentiometer and mounting plate are fully pressed into the transducer body.9. Finally, replace the plastic plug into the base and the cap into the tap.SeaTalk Service Manual 3
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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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Autohelm7.1 Service Visit - Diagnos
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AutohelmContentsPage1. Description
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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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AutohelmContentsPage1. Description
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ST7000 Course Computer General Asse
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Autohelm4. Functional TestThe Cours
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AutohelmSeaTalk Service Manual 9
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Autohelm4.3 Course Computer Bench T
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AutohelmContentsPage1. Introduction
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AutohelmWatch Alarm (not available
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Autohelm3.2 Additional information
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Autohelm3.3 Operating HintsResponse
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Autohelm• If the autopilot fails
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Autohelm3.4.1 Adjusting Calibration
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Autohelm3.5 Automatic Deviation Cor
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Autohelm1. Service ProceduresConten
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Page 174 and 175: Autohelm3. Product History Rudder R
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Page 206 and 207: Autohelm4. Type'0'Piston Pump (Z081
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Page 212 and 213: Autohelm4. Spares numbers - I/O Ste
Page 214: Autohelm- Position the support plat
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Autohelm Inboard Autopilots (ST6000 and ST7000 systems) Service ...

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