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Navitron NT888G MK2 Operating Manual

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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: sales@navitron.co.uk
Web: www.navitron.co.uk
1120/1

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  • Page 1 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: sales@navitron.co.uk Web: www.navitron.co.uk 1120/1...
  • Page 2 Display Messages, Alarms and Status Indicators. NB: Whilst all efforts have been made to ensure the safety and reliability of the NT888G MK2 Autopilot system, it should be noted that the installation of any such system should never be permitted to detract from the adequate...
  • Page 3 NT888G MK2 AUTOPILOT OPERATING MANUAL Section 1: Short Operating Instructions. 1.1 Control Unit Display Data & Initial Control Settings. 1.2 Switching to Standby or OFF. 1.3 Engaging Autopilot (ON). 1.4 Adjusting Steering Performance (Manual Adjustment of Controls). 1.5 Matching Heading Steered with Heading Set.
  • Page 4 Control Unit Display Data & Initial Control Settings - (Section 2.4). The NT888G MK2 Autopilot is Speed Adaptive and – provided it is used in adaptive mode and calibrated for the correct vessel type (DISP or HSC per 2.16) – will automatically set its own control parameters for optimum steering performance.
  • Page 5 NT888G MK2 AUTOPILOT OPERATING MANUAL Engaging Autopilot (ON) – (Section 2.2 & 2.18). The NT888G MK2 Autopilot can only be switched ON via the Standby condition thus switching directly from OFF to ON is not possible. To engage the Autopilot:- Steady the vessel on the required heading.
  • Page 6 NT888G MK2 AUTOPILOT OPERATING MANUAL Adjusting Steering Performance – (Section 2.19 – 2.22) … (Continued). (Manual Adjustment of Controls). (iv) Use the “CONTROLS” key to select “YAW” and set a value of “1” using the rotary (+/-) illum. key. Use the “CONTROLS” key to select “COUNTER”...
  • Page 7 NT888G MK2 AUTOPILOT OPERATING MANUAL Matching Heading Steered with Heading Set (Section 2.23). When the Autopilot is engaged, the AUTOTRIM (Automatic Permanent Helm – APH) function continuously monitors any long-term differences between the heading set and the mean course actually steered. Any long-term difference is automatically adjusted by the Autotrim (APH) function applying the appropriate amount of permanent helm.
  • Page 8 NT888G MK2 AUTOPILOT OPERATING MANUAL Altering to a New Heading (Section 2.36) … (Continued). To alter course to a new heading using the Autopilot: - Use the “LIMITS” key to enter the Limits Menu where the Rudder Limit value is the first item shown and should now be highlighted by a blue band.
  • Page 9 NT888G MK2 AUTOPILOT OPERATING MANUAL Programmable Automatic Rate of Turn (Section 2.6, 2.32 & 2.35) … (Continued). (iii) Use the rotary (+/-) illumination control to select “ROT”. To select required Rate of Turn (6 – 300 deg/min or 0.1 – 5 deg/sec):- NB.
  • Page 10 NT888G MK2 AUTOPILOT OPERATING MANUAL 1.10 Programmable Automatic Radius of Turn (Section 2.6 & 2.34) … (Continued). (vi) Use the rotary (+/-) illumination control to select the required Radius of Turn between the limits 0.1–9.9Nm. 1.11 Adjusting Overshoot and Undershoot (Section 2.4 & 2.24).
  • Page 11 NT888G MK2 AUTOPILOT OPERATING MANUAL 1.12 Using the Track Function (Section 2.9 & 2.38) … (Continued). To engage the Track function:- (It is assumed that valid track data is available to the Autopilot system). With Autopilot engaged (ON) use the “TRACK” key to accept data.
  • Page 12 NT888G MK2 AUTOPILOT OPERATING MANUAL 1.13 Cancelling an Audible Alarm (Section 2.8). In Autopilot ‘ON’ mode a new (unacknowledged) alarm message will be shown flashing accompanied by an audible alarm. Audible alarms can be acknowledged by operation of the “TEST” key. Alarm conditions that persist will continue to be shown in the alarm list.
  • Page 13 NT888G MK2 AUTOPILOT OPERATING MANUAL 1.15 “U TURN” function (Section 2.11 & 2.36) … (Continued). Use the “+” (STBD) or “-“ (PORT) “TURN” key to specify the direction of “U TURN” required. Unless U Turn follow up action is taken within 30 seconds, U Turn selection will be cancelled.
  • Page 14 NT888G MK2 AUTOPILOT OPERATING MANUAL (iii) “±1° / ±5°” Step Turns (Section 2.13 & 2.36) … (Continued):- To use the “±1°/±5°” function:- a) Use the “+” (STBD) or “-“ (PORT) “TURN” key to specify the direction of turn required in single presses (for 1°...
  • Page 15 NT888G MK2 AUTOPILOT OPERATING MANUAL 1.17 The Limits Menu (Section 2.6)…(Continued). NB. In the event that the LIMITS Menu has been entered but no change has been made for timeout period of 30 seconds, the display will revert automatically to its normal operating mode.
  • Page 16 NT888G MK2 AUTOPILOT OPERATING MANUAL 1.21 Using NT920NFU Dodge and Power Steer (if fitted). NT920NFU Operating Instructions: - NB. The NT920NFU(s) will 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 NFU(s) will be disabled.
  • Page 17 NT888G MK2 AUTOPILOT OPERATING MANUAL 1.21 Using NT920NFU Dodge and Power Steer (if fitted)…(Continued). Select DODGE or OFF on the NT920NFU selector switch to return heading control to the Autopilot which will maintain the vessel on the new (current) heading.
  • Page 18 1.23 Using Proprietary Power Steer and Override functions (i) Standard Dodge, Non Follow Up & Follow Up Functions:- Non Navitron (proprietary) Power steer Controls may be connected to the Autopilot System and are discussed and detailed in Section TM3.4.1 – 4 of the Installation &...
  • Page 19 NT888G MK2 AUTOPILOT OPERATING MANUAL Section 2: Operator Controls and Sea Trials. Operator Controls and Displays Defined: - 2.1 The Autopilot STANDBY / OFF Key & Modes. 2.2 The Autopilot ON Key Modes (Rudder / Thruster). 2.3 The Adaptive & Non Adaptive (PID) Autopilot Modes.
  • Page 20 2.37 Setting the Watch Alarm Period. 2.38 The Track Function. 2.39 Manual & Auto Deviation Correction. Optional Units:- 2.40 NT888G MK2 Second Station Control Units. 2.41 NT920 NFU Power Steering. 2.42 NT990 FU Power Steering. 2.43 Special Latched & Non Latched Power Steer Controls.
  • Page 21 NT888G MK2 AUTOPILOT OPERATING MANUAL Section 2: Operator Controls and Sea Trials. FIG 2 – NT888G MK2 Control Panel Layout 2.1 The Autopilot STANDBY / OFF Key & Modes (See Vessel Type per Sec. 2.16). (i) OFF All Autopilot functions are inoperative.
  • Page 22 Autopilot controls (Rudder, Yaw, Counter Rudder etc.) to achieve optimum steering performance. Alternatively, the NT888G MK2 can function as an Adaptive 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 installation and Sea Trials.
  • Page 23 NT888G MK2 AUTOPILOT OPERATING MANUAL The CONTROLS Menu (Continued). Adjustable control parameters are listed on the right side of the operational display (as shown) and each item is selected by further use of the “CONTROLS” key highlighted buy a blue bar to confirm parameter selected.
  • Page 24 NT888G MK2 AUTOPILOT OPERATING MANUAL The CONTROLS Menu / Rudder Control (Continued). Use the rotary (+/-) illum. control to set value “1-9” as required. The Rudder Control is principally employed to prevent Autopilot “Understeer” and “Oversteer” and the operator control band may be optimised by use of Loop Gain adjustment (Section 2.22) during later Sea Trials.
  • Page 25 NT888G MK2 AUTOPILOT OPERATING MANUAL The CONTROLS Menu / Counter Rudder (Continued). Use the rotary (+/-) illum. control to set value “1-9” as required. 2.4 (v) Autothrust. The Autothrust Mode refers to Autopilot control of the Thruster(s) which may be confined to Thruster ONLY or combined with Rudder to provide Rudder AND Thruster response to Autopilot steering demands.
  • Page 26 NT888G MK2 AUTOPILOT OPERATING MANUAL The CONTROLS Menu / Turn Type(ROT/RAD Selection) … (Continued). Rate of Turn Operating Note:- Rate of Turn (ROT) is reliant upon Autopilot system internal calculation based on change of heading and does not require Speed input although it must be noted that Speed through the water (STW) is essential for Speed Adaptive Autopilot operation.
  • Page 27 NT888G MK2 AUTOPILOT OPERATING MANUAL The Rotary (+/-) Illumination Control (Continued). The Menu Parameter Adjust Function:- When any of the three Autopilot Menus have been entered (Set Up Menu, Controls Menu or Limits Menu) the parameter highlighted by the cursor is adjusted using the rotary (+/-) illumination control which, in this mode, does not alter control panel/display illumination levels.
  • Page 28 NT888G MK2 AUTOPILOT OPERATING MANUAL The LIMITS Menu / OHA Calibration (Continued). To set the OHA delay time:- Simultaneously press the “CANCEL” and “CONFIRM” keys for 5 seconds until the Set Up Menu is displayed with a blue cursor highlighting the Set Up parameter currently selected.
  • Page 29 NT888G MK2 AUTOPILOT OPERATING MANUAL The LIMITS Menu / CCA Delay Period (Continued). To set the CCA alarm (difference limit) level:- Use the “LIMITS” key to enter the Limits Menu. Use the “LIMITS” key again to select “C.COMP” box followed by flashing current value (4°...
  • Page 30 NT888G MK2 AUTOPILOT OPERATING MANUAL The LIMITS Menu / ROT Calibration (Continued). To set maximum safe Rate of Turn:- If not already in the Set Up Table, simultaneously press the “CANCEL” and “CONFIRM” keys for 5 seconds until the Set Up Table is displayed with a blue cursor highlighting the Set Up parameter currently selected.
  • Page 31 NT888G MK2 AUTOPILOT OPERATING MANUAL The LIMITS Menu (Continued). 2.6 (vi) Radius of Turn (RAD) Calibration. Provided Radius of Turn (RAD) control mode has been selected via the Autopilot CONTROLS Menu (Section 2.4 (vi)) the required RAD operational level must be entered into the LIMITS Menu.
  • Page 32 NT888G MK2 AUTOPILOT OPERATING MANUAL The AUTOTRIM Key (Automatic Permanent Helm). AUTOTRIM (Automatic Permanent Helm) is applied by the Autopilot over a period of time when underway to offset the rudder and eliminate heading errors caused by windage or vessel trim etc.
  • Page 33 NT888G MK2 AUTOPILOT OPERATING MANUAL The Alarm TEST/OFF Key. The Autopilot Control Unit is equipped with an audible alarm which, in most cases, accompanies display indications of alarm and warning conditions. Under normal operating conditions, the alarm is silent but...
  • Page 34 Without “REMOTE” key operation, Remote Control Units/Power Steer Units will not function. The “REMOTE” key condition described above is applicable to all NT888G MK2 Autopilot systems employing a single NT888G MK2 Control Unit but, in systems employing two or three (maximum) Control Units, only one of these units will be the “Master”...
  • Page 35 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.11 (i) The U TURN Key…(Continued). The required direction of turn is acknowledged by the Control Unit display which will show :- “NEW COURSE PORT 180º” “NEW COURSE STBD 180º” The Control Panel “CANCEL” and “CONFIRM”...
  • Page 36 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.12 The Rotary SET COURSE Control. The rotary Course Selector produces permanent course change orders when turned anticlockwise (Port) or clockwise (Stbd). Course changes up to a maximum of 359° can be ordered when it should be noted that the Autopilot system will turn the vessel in the direction of Course Selector rotation even if this is “the long way around”.
  • Page 37 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.12 The Rotary SET COURSE Control (Continued). Rotate the Autopilot Set Course Control to move the cursor to parameter number 72 (NEW COURSE T/OUT). Use the rotary (+/-) illum. control to set 20 to 60 secs.
  • Page 38 SET COURSE area of the display). 2.14 The Control Unit Start Up Display (Splash Screen). When the NT888G MK2 Autopilot is powered up (“OFF/STBY” key) the Control Unit start up display (or splash screen) provides various important aspects of information relevant to the software and Set Up standards of the system.
  • Page 39 5 second operation of the CANCEL and CONFIRM keys. 2.16 Sea Trials and Autopilot Type Selection. It is essential to note that the NT888G MK2 Autopilot has dual Type Approvals covering conventional displacement vessels up to typically 30 knots and High Speed Craft for speeds up to 70 knots.
  • Page 40 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.16 Sea Trials and Autopilot Type Selection … (Continued). The corner LED in the STANDBY keypad will illuminate and a short self test period will elapse during which a start up screen will be displayed followed by the normal Standby mode display labelled “STANDBY: MANUAL STEERING”.
  • Page 41 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.18 Autopilot Engagement (ON)…(Continued) (The AUTOTRIM function defaults to ON whenever the Autopilot is switched from STANDBY to ON – unless reprogrammed in Set Up. As a result, provided the rudder is positioned to steer the vessel dead ahead immediately prior to Autopilot...
  • Page 42 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.20 Optimising the Rudder Control Setting. The RUDDER control provides the operator with the means to increase or decrease the angle of rudder applied in relation to course error and should be adjusted to provide positive correction of Yaw without oversteer (Section 2.19 refers).
  • Page 43 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.22 Loop Gain Calibration. Switch the Autopilot to STANDBY and enter the Set Up Menu per section 2.12 a). (Vessel now under manual steering control). (ii) Use the Autopilot Set Course knob to scroll through the Set Up parameters until ‘LOOP GAIN’...
  • Page 44 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.23 Autotrim (Automatic Permanent Helm) Assessment … (Continued). Autotrim Operating Modes. Autopilot switched from STANDBY to ON Autotrim function operational. (ii) Autotrim key to OFF Immediately cancels any (5 second press) permanent helm rudder offset angle and disables the Autotrim function.
  • Page 45 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.23 Manual Reset of Autotrim (APH) Rudder Offset (Continued). (iv) Allow the vessel to settle on the new heading (which may differ from Course actually set due to incorrect APH rudder offset). Press the SET keypad which will immediately accelerate the APH correction process by automatically estimating and applying the new rudder offset angle required.
  • Page 46 Increase time constant * NB. Unnecessary 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 Menu: - Set the Autopilot to STANDBY and enter the Set Up Menu (simultaneous 5 secs operation of CANCEL &...
  • Page 47 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.24 Evaluating the Counter Rudder Setting (Continued). Opposite Monitors the closing rate towards a new course to prevent ‘overshoot’ by removing rudder early and applying opposite rudder to ‘meet’ and stabilise the vessel on the new heading specified.
  • Page 48 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.25 Optimising the Yaw Control Setting. The YAW control setting defines the Autopilot sensitivity to short term yaw or course error and determines how much short term error will be tolerated before corrective rudder is ordered.
  • Page 49 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.27 SOG Speed Data Input (Speed over the Ground) … (Continued). (When operating in the Track Control Mode based on complex $xxHTC data received from an Approved Track Control System, all necessary parameters – including SOG –...
  • Page 50 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.29 (ii) Calibration of Power Steer Override Controls vs Speed:- Use the Autopilot STBY key to enter the Standby mode. Enter controls menu by pressing CONTROLS Key. Press the CONTROLS and LIMITS keys simultaneously for a period of 5 seconds to enter the Calibration mode confirmed by the ADAPT box showing ‘CAL1’.
  • Page 51 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.29 (iii) To calibrate Adaptive Autopilot Steering vs Speed (Continued):- Enter controls menu by pressing CONTROLS key and ensure ADAPT value box is highlighted. Exit the Adaptive calibration mode by simultaneous 5 second operation of the CONTROLS and LIMITS keys confirmed by normal operating display presentation.
  • Page 52 NT888G MK2 AUTOPILOT OPERATING MANUAL...
  • Page 53 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.31 Setting the Rudder Limit Control. The Rudder Limit Control defines the maximum angle of rudder that the Autopilot is able to apply with the exception of Counter Rudder, which overrides the Rudder Limit setting.
  • Page 54 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.32 Setting Rate of Turn Control … (Continued). Automatic ROT Calibration:- Note – Automatic ROT Calibration must only be used when the Autopilot System is connected to a Rudder Reference Unit giving continuous rudder position information.
  • Page 55 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.32 TO SET RATE OF TURN (Operational)… (Continued). The Control Unit display continuously shows ACTUAL and SET ROT thus current operational values are always available provided:- ROT Mode selected (vs Radius) via CONTROLS Menu (Sect. 2.4 (vi)).
  • Page 56 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.34 Setting Radius of Turn … (Continued). NB. The operational Radius of Turn (NM) is programmed within the Autopilot via the LIMITS Menu (Section 2.6 (vi)) but can be overruled by Track data command received from a Type Approved Track Control System.
  • Page 57 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.35 Optimising the Off Heading & Course Comparator Alarms … (Continued). Alarm Trip Level. The specified limit (Alarm trip level) is operator selectable at 2° to 30° in 2° steps – or can be switched OFF - via entry to the LIMITS Menu.
  • Page 58 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.35 Optimising the Off Heading & Course Comparator Alarms … (Continued). (iii) Course Comparator Alarm (CCA) Operating Note – The CCA will only function when two heading inputs are connected to the Autopilot system with nominated priorities of No. 1 and No. 2.
  • Page 59 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.36 Setting and Confirming New Autopilot Courses … (Continued). Prolonged rotation will automatically result in larger changes “per click” to make large course changes viable by avoiding the need for multiple turns. (6 clicks @ 0.5°, 6 @1° then 2°).
  • Page 60 “Heading to Steer” data received from a proprietary Track Control System. NB. The NT888G 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 conjunction with a Type Approved Track Control System compliant with IEC 62065.
  • Page 61 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.38 The Track Function … (Continued). Other commands may also be present in the Track data sentence type received by the Autopilot which will respond accordingly to alter various of its Menu set steering parameters during Track Mode as follows: - Rudder Limit.
  • Page 62 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.38 (i) Track Mode Display and Status Information … (Continued). Every 18 seconds, this display is interrupted for a period of 1 sec to display received data sentence type (HTC, APB or HSC) and Active Heading sensor.
  • Page 63 2.39 Manual and Auto Deviation Correction. Magnetic Deviation. 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 associated with the compass.
  • Page 64 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.39 (i) Automatic Deviation Correction Procedure. (a) Enter the Set Up Menu by 5 second simultaneous CANCEL/CONFIRM key operation and use the Set Course knob to scroll to Parameter No. 50 (MAN/AUTO/CLEAR). (b) Use the rotary illumination control (+/-) to set AUTO.
  • Page 65 (d) Release the AUTOTRIM key to complete clear down. 2.40 NT888G MK2 Second Station Control Units. All NT888G MK2 Autopilot system Control Units are identical and may be used in Master/Slave configurations as required up to a maximum of 3 Control Units per system.
  • Page 66 2.42 NT990 FU Power Steering – Refer to Section 1.22. 2.43 Special Latched and Non Latched Power Steer Controls. In addition to standard Navitron Follow Up (NT990 FU) and Non Follow Up (NT920 NFU) Power Steer options, the Autopilot will accept proprietary unit power steer inputs via a dedicated opto isolated input port for special uses.
  • Page 67 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.43 (ii) Non Latched Jog Lever (Non Follow Up) Override Control … (Continued). Movement left (Port) or right (Stbd) of the sprung lever will initiate a fixed and safe angle of rudder (speed related and calibrated during Sea Trials).
  • Page 68 NT888G MK2 AUTOPILOT OPERATING MANUAL 2.43 (iv) To Select the Isolated Input Steering Mode:- a) Simultaneously press the “CANCEL” and “CONFIRM” keys for 5 seconds until the Set Up Menu is displayed with a black cursor highlighting the Set Up parameter currently selected.
  • Page 69 NT888G MK2 AUTOPILOT OPERATING MANUAL Section 3: Display Messages, Alarms and Status Indicators. Displays at Power Up (Self Test). Failure Messages at Power Up (Self Test Failure). Operational Display Messages. Alert Display Messages. Alert Diagnostic display. Operational Status LED’s.
  • Page 70 - 3.1 Display at Power Up. When the NT888G MK2 Autopilot is powered up (“OFF/STBY” key) the Control Unit start up display (or splash screen) provides various important aspects of information relevant to the software and Set Up standards of the system.
  • Page 71 NT888G MK2 AUTOPILOT OPERATING MANUAL 3.3 Operational Display Messages … (Continued). All Autopilot operating modes are continuously shown (as appropriate):- STANDBY – Autopilot in standby mode, steer the vessel manually. (ii) REM STBY – External Steering selector switch forcing the Autopilot system to “Standby”...
  • Page 72 3.3 Operational Display Messages … (Continued). (xxi) REM N.F.U – Navitron/proprietary NFU active. (xxii) REM DODGE – Navitron/proprietary DODGE active. Changes to the operational display occur automatically when Track Steering Mode is selected and when new Autopilot courses are ordered via the rotary Set Course Control or the Turn Mode keys.
  • Page 73 NT888G MK2 AUTOPILOT OPERATING MANUAL Alarm Display Messages (continued). HCS fault Rudder feedback A failed Caution HCS fault Rudder feedback B failed Caution HCS fault Draft adaptive control unavailable, no data Caution Low speed Ship’s speed too low for HDG control...
  • 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 This is a non operational aspect which should only be referred to in conjunction with advice from Navitron Systems Ltd should the need arise. The first set of diagnostic information lists any active engineering alarms (e.g. Steering Fail, Limit Switch Open etc.).
  • Page 76 NT888G MK2 AUTOPILOT OPERATING MANUAL 3.5.1 Engineering diagnostic alarm information. The following alarm messages will be displayed (if appropriate) in the diagnostic box at left side of the display. 3.5.1 (i) Heading Sensor Fail Messages:- CPS HI FAIL - Signal from HSC is too large.
  • Page 77 NO ORIDE CAL – Override power steer control requested but uncalibrated. 3.6 Operational Status LED’s. There are a total of 11 LEDs on the NT888G MK2 Control Unit panel:- O STBY – Corner LED illuminated confirms STANDBY or OFF Mode. (ii) O ON - Corner LED illuminated confirms Autopilot ON/Rudder only Mode.

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