MD71THD Control & Display Unit

MD71THD DISPLAY HEAD UNIT FOR TMC AND EMC SYSTEMS

MODEL NUMBER: MD71THD

The Human Input Device in a MARINE DATA Transmitting Heading Device (THD) System. Allows the magnetic correction coefficients and variation to be entered manually. Displays Heading

Product Description

OVERVIEW – THD Display Head Unit

The Transmitting Heading Device (THD) Systems are becoming increasingly popular as a backup or an alternative to a gyro compass. MARINE DATA offers a Transmitting Magnetic Compass (TMC) or an Electromagnetic Compass (EMC) solution. The TMC echoes the ship’s magnetic compass in its binnacle; the EMC directly detects the Earth’s magnetic field as a fully independent electromagnetic compass.

The menu-driven MD71THD Control and Display Unit provides easy calibration of the magnetic heading sensor and allows the manual input of variation and deviation corrections.  It provides a crystal clear digital display of heading in a compact design.

The MD71THD Control and Display Unit from MARINE DATA: flexible in application, easy to install and simple to maintain.

SPECIAL FEATURES

  • The heart of a MARINE DATA Transmitting Heading Device (THD) system
  • Automatic compass sensor calibration (TMC)
  • Yellow OLED high visibility display, 2.7” (128 x 64 pixel) with superb black-level reproduction

APPLICATIONS

  • Integrates all the key components in a MARINE DATA Transmitting Heading (THD) System
  • Calibrates the magnetic heading sensor and allows the manual input of variation and deviation corrections
  • Provides a NMEA 0183 output of Heading for forwarding to Compass Repeaters and other equipment

RELATED SYSTEMS

  • Supplied as part of the MD71TMC System (Transmitting Magnetic Compass System) SKU F071100
  • Supplied as part of the MD71EMC System (Electromagnetic Compass System) SKU F071101

Note: The MD71THD is not supplied as standard with the simplified MD97TMC Transmitting Magnetic Compass System (SKU F097100). However, the MD71THD can be retro-fitted to the MD97TMC system.

Product Specifications

PHYSICAL

  • Weight: 0.4 kg
  • Mounting: Panel mount (standard); Surface mount (option)
  • Dimensions: H 96 mm; W 96 mm; D 35 mm; Allow 80 mm at rear for cable; Fascia 96 x 96 x 6 mm deep
  • Connections: 1x 15-way D-type plug connector; 1x 9-way D-type socket connector; M4 Earth stud
  • Construction: Aluminium alloy enclosure
  • Finish: RAL9005 Jet Black, fine texture paint

ELECTRICAL

  • Power Supply: 24 V dc (18-32 V dc); 3 W max
  • With main & backup (standby) dual power connections
  • Low Power alarm trigger: 9.0 V
  • Low Power alarm cancel: 11.5 V
  • Data Input: Digital RS422
  • Data Protocol: NMEA 0183 (IEC 61162-1) Compliant; 4800 / 9600 / 19200 / 38000 Baud, selectable
  • Data Sentences: $HCHDT; $HCHDG; $HCHDM
  • Data Output: 2 x RS422 NMEA 0183 Heading Data Outputs; Audible Alarm
  • Remote Dimmer: Optional; 0-24 V dc (with respect to supply negative)
  • Cable:   Supplied with 2.5 m multicore data cable, 15-way D-type connector to bare tails

OPERATIONAL

  • Performance: Heading Accuracy: TMC: <±1.0º; EMC: <±1.0º
  • Display: 7” 128 x 64 Pixel OLED – Yellow
  • User Interface: 6 button membrane keypad
  • Error Indication: Flashing Warning Message + Audible Alarm Fixed Warning Message (acknowledged alarm)
  • MTBF: >30,000 hours

ENVIRONMENTAL

  • IP rating: IP54
  • Operating temp -15°C to +55°C
  • Magnetic: Magnetic Permeability: Category ‘A’
  • Compass: Safe Distance 50 cm

APPROVALS

  • Complies with: IEC 60945; IEC 61162-1
  • RoHS: Compliant

ADDITIONAL INFORMATION

  • Supplied as part of a MARINE DATA THD System
  • Supplied: Panel mounting kit CM88536

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