NM-2C - NUOVA MAREA LTDnuovamarea.com/files/product manuals/nm manuals/NM-2C_v1.00.pdf · NM-2C Heading/Track Control Converter for BNWAS User's Guide Installation manual V 1.00 nuova

NM-2C

Heading/Track Control Converter for BNWAS

User's GuideInstallation manual

V 1.00

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Introduction

The NM-2C is an interface intended for use between ship’s GPS or heading or track control system and the BNWAS according to the Paragraph 4.1.1.1 of Res. MSC. 128 (75) stating:

4.1.1.1 The BNWAS should incorporate the following operational modes:Automatic (Automatically brought into operation whenever the ship's heading or track control system (i.e. auto steering mode of steering control stand (Auto pilot)) is activated and inhibited when this system is not activ-ated).

Operation

The NM-2C can input NMEA-0183 data from the GPS ($GPVTG or $GPRMC) or the ship’s heading or track control system ($--HTD or $--HTC from the Auto Pilot) and supply to the BNWAS the automatic ON/OFF commands via a dry contact closure output interface.The NM-2C has three modes of operation that are user selectable via the jumpers J1 and J2 (see composite layout image and Jumper configuration settings table below):

• GPS CONTROL MODE

In this mode the NM-2C is connected to the GPS and the automatic ON command is initiated for vessel speeds equal or greater than 3 knots and the OFF command for speeds less than 3 knots.

• TRACK CONTROL MODE

In this mode the NM-2C is connected to the Autopilot and the automatic ON command is initiated when the selected steering mode is one of the S (Standalone), H (Heading control), T (Track Control) or R (Rudder control) and the OFF command when the M (Manual steering) is selected (see Appendix A: NMEA $xxHTD and $xxHTC sentences specification).

• TEST/OVERIDE MODE

In this mode the relay output interface is tested for normal operation along with the BNWAS correct connection/functionality (for testing/service purposes only)

Input Port (listener)

The NM-2C has one NMEA-0183 input port that can be connected to the GPS or heading/track control system. The input port is optoisolated as specified in NMEA-0183 protocol, thus data(-) pole should never been connected to NM-2C ground. If the instrument’s talker port is single ended, connect that terminal to the In(+) input and tide the IN(-) to instrument’s ground. If a RS-232 signal level is connected the ground pole (GND) should be connected to In(+) and the data pole (TXD) to In(-) respectively.The input port can acquire NMEA-0183 sentences carried in TTL, RS-232 and RS-485/422 signal levels.



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Output Port (contact closure interface)The output port of the NM-2C is a dry contact closure interface. The user can select between the Normally Closed or Normally Open contact, in order to achieve compatibility with the BNWAS system.

Connection Diagram

Power SupplyThe ΧΧΧ can be powered within the range of 10-32 Volt DC. The nominal voltage of 24 Volt DC is advised for powering the device in normal operation.Power input port features protection for incorrect polarity connection of the supplying voltage and a PTC resettable Fuse in case of overload.



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Jumper configuration settings and Indicator sequence

Jumper J1 Jumper J2 Green LED

Red LED MODE FUNCTIONALITY

DESCRIPTIONJ1-1 J1-2 J2(1-2)

J2 (1-3) LD1 LD2

CLOSED OPEN CLOSED OPEN FLASHING OFFGPS

CONTROLMODE

Ship’s speed from GPS is less than 3 Knots (LD2=OFF). The LED LD1 indicates correct data input connection to the NM-2C ($GPVTG or $GPRMC is received).

CLOSED OPEN CLOSED OPEN FLASHING ONGPS

CONTROL MODE

Ship’s speed from GPS is equal or more than 3 Knots (LD2=ON). The LED LD1 indicates correct data input connection to the NM-2C ($GPVTG or $GPRMC is received).

CLOSED OPEN CLOSED OPEN

TOGGLES STATE EVERY 5 Sec

OFFGPS

CONTROL MODE

No or incorrect data (none of the $GPVTG or $GPRMC is received) or incorrect data signal polarity.

OPEN CLOSED CLOSED OPEN FLASHING OFFTRACK

CONTROL MODE

Selected steering mode is M (Manual steering) (LD2=OFF). The LED LD1 indicates correct data input connection to the NM-2C ($--HTC or $--HTD is received).

OPEN CLOSED CLOSED OPEN FLASHING ONTRACK

CONTROL MODE

Selected steering mode is one of the S (Standalone), H (Heading control), T (Track Control) or R (Rudder control) (LD2=ON). The LED LD1 indicates correct data input connection to the NM-2C ($--HTC or $--HTD is received).

OPEN CLOSED CLOSED OPEN

TOGGLES STATE EVERY 5 Sec

OFFTRACK

CONTROL MODE

No or incorrect data (none of the $--HTC or $--HTD is received) or incorrect data signal polarity.

CLOSED CLOSED X X X X Not Applicable

X X OPEN CLOSED ON ONTEST/

OVERIDE MODE

The NM-2C is in test mode.(for service purposes only)



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Specifications

Supply Voltage 9 to 32 VDCPower Supply Protection PTC Resettable Fuse

Vmax: 60V, Imax: 40A, Ihold: 0,3A (23°C), Itrip:0,6A (23°C), Max time to trip (23°C): 3sec for 1,5A

Current Consumption 5mA in idle stateInputs 1 x NMEA-0183, optically isolated

Common Mode Rejection: 10kV/usec, Isolation: 480 VrmsInput Resistance 1 KOhmOutput 1 x Relay output Normally Closed

1 x Relay output Normally OpenUL/C-UL rating (resistive load): 1A@120VAC/2A@24VDCTUV rating (resistive load): 0.5A@110VAC/1A@24VDCMax. Switching Voltage: 220VDC/250VACMax. Switching Current: 2AMax. Carrying Current: 3A

Speed for NMEA input 4.800/8/N/1Indicators (LED) LD1: NMEA-0183 data input connection` or TEST/OVERIDE mode indication

LD2: Relay statusConfiguration Interface Jumpers J1: Selects GPS/TRACK Control Modes

Jumper J2: Selects TEST/OVERIDE ModeDimensions (maximum) Width = 47 mm

Depth = 83 mmHeight = 65 mm

Housing Din Rail PCB Holder



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APPENDIX AVTG – Course over ground and ground speed

The actual course and speed relative to the ground.

NOTE: Positioning system Mode indicator:A = Autonomous modeD = Differential modeE = Estimated (dead reckoning) modeM = Manual input modeS = Simulator modeN = Data not validThe positioning system Mode indicator field shall not be a null field.

RMB – Recommended minimum navigation information

Navigation data from present position to a destination waypoint provided by a LORAN-C, GNSS, DECCA, naviga-tion computer or other integrated navigation system. This sentence always accompanies RMA or RMC sentences when a destination is active when provided by a LORAN-C, or GNSS receiver, other systems may transmit $--RMB without $--RMA or $--RMC.



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NOTE 1: If range to destination exceeds 999,9 nautical miles, display 999,9.NOTE 2: If cross track error exceeds 9,99 nautical miles, display 9,99.NOTE 3: Positioning system Mode indicator:

A = Autonomous modeD = Differential modeE = Estimated (dead reckoning) modeM = Manual input modeS = Simulator modeN = Data not valid

NOTE 4: The positioning system Mode indicator field supplements the Status field (field No. 1) which shall be set to V = invalid for all values of Mode indicator except for A = Autonomous and D = Differential. The positioning system Mode indicator and Status fields shall not be null field.

*HTC – Heading/Track control command*HTD – Heading /Track control data

IMO – MSC 64(67) Annex 3. Commands to, and data from, heading control systems. Provides input to (HTC) a heading controller to set values, modes and references; or provides output from (HTD) a heading controller with information about values, modes and references in use.

NOTE 1: Override provides direct control of the steering gear. In the context of this sentence override means a tempor-ary interruption of the selected steering mode. In this period steering is performed by special devices. As long as field "Override" is set to "A", both fields "Selected steering mode" and " Turn mode" shall be ignored by the heading/track controller and its computing parts shall operate as if manual steering was selected.



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NOTE 2: All steering modes represent steering as selected by a steering selector switch or by a preceding HTC sentence. Priority levels of these inputs and usage/acceptance of related fields are to be defined and documented by the manufacturer.Selected steering modes may be:

M = Manual steering. The main steering system is in use.S = Stand-alone (heading control). The system works as a stand-alone heading controller. Field ”Commanded heading to steer” is not accepted as an input.H = Heading control. Input of commanded heading to steer is from an external device and the system works as a remotely controlled heading controller. Field "Commanded heading to steer" is accepted as an input.T = Track control. The system works as a track controller by correcting a course received in field “Commanded track”. Corrections are made based on additionally received track errors (e.g. from sen-tence XTE, APB, ...).R = Rudder control. Input of commanded rudder angle and direction from an external device. The sys-tem accepts values given in fields “Commanded rudder angle” and “Commanded rudder direction” and controls the steering by the same electronic means as used in modes S, H or T.

NOTE 3: Turn mode defines how the ship changes heading when in steering modes S, H or T according to the selected turn mode values given in fields “Commanded radius of turn” or “Commanded rate of turn”. With turn mode set to “N”, turns are not controlled but depend upon the ship’s maneuverability and applied rudder angles only.

NOTE 4: Commanded track represents the course line (leg) between two waypoints. It may be altered dynamically in a track-controlled turn along a pre-planned radius.

NOTE 5: Off-track status can be generated if the selected steering mode is “T”.

NOTE 6: Data in these fields shall be related to the heading reference in use.



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NM-2C - NUOVA MAREA LTDnuovamarea.com/files/product manuals/nm manuals/NM-2C_v1.00.pdf · NM-2C Heading/Track Control Converter for BNWAS User's Guide Installation manual V 1.00 nuova

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