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NAVITRON SYSTEMS LTD 

 

NT888G MK2 AUTOPILOT  

 
 
 
 

OPERATING MANUAL 

 

 

 

 

17 The Tanneries 

Brockhampton Lane 

Havant, Hants, U.K. PO9 1JB 

Registered in England No. 2607869 

 
 

Tel: (023) 9249 8740 

Fax: (023) 9249 8783 

Int. Code: +44 23 

Email: [email protected] 

Web: www.navitron.co.uk

 

 
 
 

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Summary of Contents for NT888G MK2

Page 1: ...2 AUTOPILOT OPERATING MANUAL 17 The Tanneries Brockhampton Lane Havant Hants U K PO9 1JB Registered in England No 2607869 Tel 023 9249 8740 Fax 023 9249 8783 Int Code 44 23 Email sales navitron co uk...

Page 2: ...l displacement vessels versus High Speed Craft are very different it is essential that the correct vessel type DISP or HSC is correctly entered in the Autopilot SET UP Menu during installation and cal...

Page 3: ...r Limit Control 1 9 Programmable Automatic Rate of Turn Control 1 10 Programmable Automatic Radius of Turn 1 11 Adjusting Overshoot and Undershoot 1 12 Using the Track Function 1 13 Cancelling an Audi...

Page 4: ...ry to the Controls Menu which is shown on the right of the main display Unless alternative settings have been established from experience during sea passages with the Autopilot in operation selection...

Page 5: ...rate in the Adaptive Mode until calibrated per Section 2 29 and manually entered operational control settings will be required via access to the Controls Menu as follows i With the Autopilot in the ST...

Page 6: ...ndersteer or Oversteer as follows vii Use the CONTROLS key to select RUDDER and increase or decrease the Rudder Control value 1 to 9 using the rotary illum key to optimise the straight line steering p...

Page 7: ...n automatically adjusted feature of the full Adaptive operating mode will require manual adjustment in the non Adaptive PID mode To manually decrease the frequency of rudder movement due to yawing i U...

Page 8: ...out confirmation within 30 seconds the new course demand will automatically cancel and the original set course will be maintained Pressing the CANCEL key will also cancel the course change NB The Auto...

Page 9: ...hes the new set heading and the Rate of Turn decreases the MAX display indication will automatically extinguish NB During Track Steering Mode using the HTC sentence Section 2 9 2 38 it is possible for...

Page 10: ...ding when altering course using the Autopilot If vessel overshoots increase COUNTER RUDDER value If vessel undershoots reduce COUNTER RUDDER value 1 12 Using the Track Function Section 2 9 2 38 The Au...

Page 11: ...ew Heading to Waypoint and the Track graphic will show vessel icon left or right of heading with the error angle below If the Track Mode Heading to Waypoint is to be rejected use the CANCEL key If the...

Page 12: ...1 14 Testing Alarms Section 2 8 The alarms may be tested by double press of the TEST OFF keypad if the alarm function is muted audible alarms will be automatically re enabled X 2 To test Alarms i Dou...

Page 13: ...ons the turn to Next Course To use the NEXT COURSE function a Press the NEXT COURSE key confirmed by flashing corner LED illumination NB NEXT COURSE request cancelled if required by 2nd press of NEXT...

Page 14: ...listing from ADAPT to TURN TYPE as shown and selection of the parameter required is via further CONTROL key operation When the required item is highlighted by the blue bar the value or state of that i...

Page 15: ...Remote Stations permitted to work REMOTE Off corner LED off Remote Stations not permitted to work 1 19 The Illumination Control Section 2 5 In the normal Autopilot Operating Mode the rotary illuminat...

Page 16: ...DODGE READY LED iii Move and hold the NT920NFU Jog Lever right STBD or Left PORT to apply corresponding rudder and override the Autopilot iv Release the Jog Lever to centre when ready for the Autopil...

Page 17: ...ll only function when the Autopilot REMOTE key is set to enable Remote inputs REMOTE key corner LED on If the REMOTE key is off no corner LED the NT990 FU s will be disabled i Check that the Autopilot...

Page 18: ...nd the Autopilot will maintain the vessel on the current heading 1 23 Using Proprietary Power Steer and Override functions i Standard Dodge Non Follow Up Follow Up Functions Non Navitron proprietary P...

Page 19: ...Type ROT or RAD 2 5 The Rotary Illumination Control 2 6 The LIMITS Menu i Rudder Limit ii Off Heading Alarm iii Course Comparator Alarm iv Watch Alarm v Rate of Turn ROT Calibration Display sec or min...

Page 20: ...d Data Input Speed through the Water 2 27 SOG Speed Data Input Speed over the Ground 2 28 Draft Input Laden State 2 29 Calibration of Steering Performance Override Controls vs Speed 2 30 Calibration o...

Page 21: ...the Control Unit Display as STANDBY A flashing dot heartbeat is shown in the bottom right hand corner of the display to indicate that the system is functioning normally the display is being actively...

Page 22: ...daptive Autopilot where the control parameters are automatically adjusted as a function of Speed and Draft input data which typically requires little or no manual adjustment beyond initial installatio...

Page 23: ...ia the CONTROLS Menu If Non Adaptive operation is in use it will always be necessary to adjust the RUDDER value manually again via the CONTROLS Menu The Rudder Control defines the angle of Rudder that...

Page 24: ...ng short term course errors arising from pitch and roll etc thus avoiding unnecessary Rudder movement As a general rule the Yaw control should be set to provide good sensitivity which would normally b...

Page 25: ...ombined to degrade Autopilot course keeping when using Rudder s only In this case the Rudder Mode of control would be retained but would be assisted by the introduction of Bowthruster action via selec...

Page 26: ...data via the xxHTC sentence Section 2 9 2 38 refers Rate ROT or Radius RAD control type is selected via the CONTROLS Menu as follows a Use the CONTROLS key to enter the Controls Menu b Use the CONTROL...

Page 27: ...that the Autopilot is normally permitted to apply However the Limit set can be exceeded if the Autopilot system is obliged to demand a greater angle of rudder to check high rates of turn The required...

Page 28: ...e whichever inputs are prioritised as No 1 and No 2 To switch the Course Comparator Alarm Mode ON OFF a Simultaneously press the CANCEL and CONFIRM keys for 5 seconds until the Set Up Menu is display...

Page 29: ...et the Watch Alarm time interval OFF or 3 to 12 mins a Use the LIMITS key to enter the Limits Menu b Use the LIMITS key again to select WATCH box followed by flashing current value OFF or 3 to 12 c Us...

Page 30: ...ed via the LIMITS Menu NB If ROT has not been selected in the CONTROLS Menu i e RAD Turn Type selected the ROT setting in the LIMITS Menu will not respond to cursor selection adjustment To set the ope...

Page 31: ...n override the RAD value set in the Autopilot LIMITS Menu or even command ROT control operation in the Track Steering Mode Sections 2 4 and 2 9 refer To set the operational Radius of Turn RAD value a...

Page 32: ...determined during Sea Trials and include the APH Time Constant and Autotrim Trip Angle the values of which are set altered via the Set Up Menu Installation and Tech Manual Section 3 13 to 3 15 The Set...

Page 33: ...are muted they will be automatically re enabled 2 9 The TRACK Key Track Mode Steering operation is only possible when the Autopilot System is engaged ON and Track Steer data is available to the Autopi...

Page 34: ...to No 2 or 3 the REMOTE key of No 1 should be activated LED on to allow entry by Nos 2 and 3 The nominated new Master No 2 or No 3 should then be switched ON after which the ON and REMOTE keys should...

Page 35: ...confirmed by flashing corner LED and display change to show NEXT XXX b Rotate the COURSE SET control until the new course required is shown in the NEXT box on the display flashing NEXT XXX c The dire...

Page 36: ...s ordered by the rotary SET COURSE Control are always displayed in the SET COURSE area of the display and will be shown as a flashing NEW COURSE value if CONFIRM key operation is required to turn to t...

Page 37: ...ormal operational functions can be summarised as follows i NEW COURSE and NEXT COURSE modes Execute Confirm or abort Cancel ii COURSE AGAIN Resume Course function and Latched NFU See Operating Manual...

Page 38: ...peration the Autopilot display will show following values Heading data source Rate of Turn See Note 1 Autopilot Course Set Set Radius New Course via Rate of Turn operator Track order Speed data Rudder...

Page 39: ...ement DISP or High Speed Craft HSC Mode of operation set is always displayed on the autopilot Control Unit splash screen at power up If it is required to alter the vessel type set i With the Autopilot...

Page 40: ...steer the vessel and check that the ACTUAL HEADING and SET COURSE values displayed follow ships head movement accurately and in unison The rudder angle indicator display should also function normally...

Page 41: ...ion in practice i e increases sensitivity to Yaw PORT Yaw will result in STBD rudder application confirmed by illumination of the GREEN chevron situated immediately above the Set Course knob Conversel...

Page 42: ...tting will need to be decreased NB Once the Adaptive calibration has been optimised versus Speed Draft input data the RUDDER parameter adjustment will be automatic in the Adaptive operating mode Secti...

Page 43: ...e Autopilot is switched from STANDBY to ON and permits the Autopilot to copy the angle of offset rudder manually applied to steer the vessel dead ahead on the desired heading i e Trim compensated at t...

Page 44: ...lly corrected over the timing period associated with the Autotrim APH integrator to correct the mean direction through the water i e the mean course actually steered will be the same as the course act...

Page 45: ...ted by the time based automatic AUTOTRIM correction process However the Autopilot is equipped to automatically trip or cancel any existing TRIM APH rudder offset for any course change ordered in exces...

Page 46: ...ry reduction of time constant can degrade overall steering performance If in doubt consult Navitron Systems Ltd To Alter the Autotrim Time Constant The Autotrim time constant is accessed via the Setup...

Page 47: ...e opposite direction to gain an average evaluation Vessel Consistently Overshoots Increase the Counter Rudder Value Vessel Prematurely Arrested Decrease the Counter Rudder Value The optimum Counter se...

Page 48: ...trim APH Integrator with a higher long term resolution than the Yaw control setting would otherwise permit As a general rule the Yaw control should be set at the lowest number that provides the requir...

Page 49: ...on of the TEST OFF key NB If the alarm is muted in this manner ALL audible alarms will be muted 2 29 Calibration of Adaptive Steering Performance vs Speed The Speed Adaptive operating mode is based on...

Page 50: ...ey operation to exit the calibration mode 2 29 iii To calibrate Adaptive Autopilot Steering vs Speed Calibration parameters 4 5 and 6 require minimum normal working and maximum vessel speeds in a full...

Page 51: ...ntrols for optimum steering performance sections 2 19 2 25 refer at the lowest realistic working speed likely for Autopilot control Enter the Controls Menu by pressing the CONTROLS key b Simultaneousl...

Page 52: ...NT888G MK2 AUTOPILOT OPERATING MANUAL...

Page 53: ...ering mode is operational using the HTC sentence it is possible for the Track Control system to override the Rudder limit value set within the Autopilot LIMITS Menu 2 32 Setting Rate of Turn Control i...

Page 54: ...libration value v Exit the Set Up Menu simultaneous 5 second operation of the CANCEL and CONFIRM keys To Adjust the ROT Calibration Value Manually proceed as follows Manual ROT Calibration i If the Au...

Page 55: ...ill not be affected by external factors such as Track Control data etc Accordingly the maximum Safe Rate of Turn limit set is the absolute maximum the Autopilot will permit during automatic heading co...

Page 56: ...rent value 0 1 to 9 9 iii Use the rotary illum control to set RAD nm value required In the event that Speed over the Ground SOG data is absent or that SOG is to slow to adequately control specified Ra...

Page 57: ...is feature prevents unnecessary alarms due to natural yaw periodic motion of the vessel ii OHA ALARM TIMEOUT Parameter No 69 in the Set Up Menu this can be programmed from 30 to 120 seconds in 1 secon...

Page 58: ...s for 5 seconds until the Set Up Menu is displayed with a blue cursor highlighting the Set Up parameter currently selected b Rotate the Autopilot Set Course Control to move the cursor to parameter num...

Page 59: ...er 1 step course changes Sections 2 12 2 13 refer A Control Unit generated alarm requesting confirmation CONFIRM key is subject to a programmable timeout period 20 to 60 seconds via the SET UP Menu du...

Page 60: ...G MK2 is a Wheelmarked Autopilot IMO A342 ix as amended by MSC 64 67 Annex 3 in addition to HSC Certification ISO 16329 with an approved Track steering facility provided the latter is used in conjunct...

Page 61: ...t will use its own LIMITS Menu set value Track Data is only accepted when the Autopilot TRACK keypad is activated confirmed by illumination of the corner LED Without TRACK keypad acceptance corner LED...

Page 62: ...ata type xxHTC received from an Approved Track Control System will be acted upon fully automatically no CANCEL CONFIRM action required per full Track Control System steering performance specs CONFIRM...

Page 63: ...iation A Navitron Heading Sensor Coil type HSC 1 or HSC 2 attached above or below a magnetic compass to transmit heading information to the Autopilot system will be subject to any deviation errors ass...

Page 64: ...y shows SAVE g Press the AUTOTRIM key to save the data which will be confirmed by the message END 2 39 ii Manual Deviation Correction Procedure a Enter the Set Up Menu by 5 second simultaneous CANCEL...

Page 65: ...nflict thus address changes will be required See Section 3 0 of the Installation and Technical Manual When two or three Control Units are correctly installed with different address numbers address No...

Page 66: ...eer inputs to this port can provide one of three installation selectable working modes programmed via the Autopilot SET UP Menu 2 43 i Normal proprietary Follow Up Power Steer Typically a proprietary...

Page 67: ...ung lever will initiate a fixed and safe angle of rudder speed related and calibrated during Sea Trials Release of the jog lever sprung back to centre will leave the rudder at the calibrated angle but...

Page 68: ...Up Menu is displayed with a black cursor highlighting the Set Up parameter currently selected b Rotate the Autopilot Set Course Control to move the cursor to parameter numbers 75 78 NORM HSC LATCH JO...

Page 69: ...isplay Messages Alarms and Status Indicators 3 1 Displays at Power Up Self Test 3 2 Failure Messages at Power Up Self Test Failure 3 3 Operational Display Messages 3 4 Alert Display Messages 3 5 Alert...

Page 70: ...n iv Control Unit Address identity v Master status if applicable vi Distribution Unit software versions 6 items The message WAITING flashing may also be shown on the splash screen to indicate that the...

Page 71: ...ilot engaged in Track Steer Mode controlling Rudder only x TRACK Autopilot engaged in Track Steer Mode controlling Thruster only xi TRACK Autopilot engaged in Track Steer Mode with Rudder Thruster xii...

Page 72: ...ert remotely from the BAM system Alert Text Message Text Alert Type No alert None Lost HDG control HCS Failed Switch to Manual steering Alarm Doubtful heading Deviation between heading sources exceede...

Page 73: ...n fallback Gyro 1 lost normal HC using Step HDG Caution HDG in fallback Gyro 2 lost normal HC using Gyro 1 Caution HDG in fallback Gyro 2 lost normal HC using Mag Compass Caution HDG in fallback Gyro...

Page 74: ...NT888G MK2 AUTOPILOT OPERATING MANUAL Active silenced warning Active acknowledged warning Rectified unacknowledged warning Caution Table 3 4 2 Alert Icons continued...

Page 75: ...s for a period of 5 seconds until DIAGS appears on the Control Unit display to confirm entry to the diagnostic mode iii There are 13 diagnostic screen sets which are displayed stepped through in turn...

Page 76: ...HCC 1 FAIL NMEA Channel 1 HCC Heading sentence fail HDT 2 FAIL NMEA Channel 2 HDT Heading sentence fail HDG 2 FAIL NMEA Channel 2 HDG Heading sentence fail HDM 2 FAIL NMEA Channel 2 HDM Heading sente...

Page 77: ...OFF Mode ii O ON Corner LED illuminated confirms Autopilot ON Rudder only Mode iii O ON Corner LED on confirms Autopilot ON Thruster only Mode iv O ON LED on confirms Autopilot ON Rudder Thruster Mod...

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