3. Mechanical Installation
JCY-1800/1850 VDR/S-VDR Installation Guide
53
DOC No. 7ZPJD0387C
3.8. Digital Signal Converter: NCT-63 - 16ch - (VDR Option)
3.8.1. Selecting the Location
The location of a Digital Signal Converter should meet the following conditions.
1) The length of the cable to each sensor should be as sort as possible.
2) The Digital Signal Converter should be protected from bad weathers, and the temperature around it
can be kept at an appropriate level.
3) The Digital Signal Converter should be free from excessive vibrations.
4) The compass safety distance of 0.2m can be secured.
5) The Digital Signal Converter should be away from electric apparatuses such as the RADAR, radio
communication equipment, and so on that may emit an excessive electromagnetic field.
6) The maintenance and inspections should be easy enough.
7) The grounding wire to the ship’s hull should be as short as possible.
3.8.2. Fastening the Digital Signal Converter
3.8.2.1. Connecting Cables
1) Wiring hole:
Any Digital Signal Converter is connected with cables from the Recording Control Unit and various
sensors. It therefore has wiring holes in its back and bottom for these cables to come in through.
2) Grounding terminal:
To ensure continuous and stable operations, any Digital Signal Converter needs to be grounded
appropriately to the ship’s hull.
3.8.2.2. Vicinity Clearance of a Digital Signal Converter
Any Digital Signal Converter has a cover on top. To allow the cover to open easily at anytime for
maintenance and inspections, the area within 0.43m of the top cover should be kept obstacle-free.
3.8.2.3. Fastening a Digital Signal Converter
Fasten a Digital Signal Converter onto a bulkhead with four M6 steel bolts (φ7.5mm). The bulkhead
has to sustain the weight of 2.9kg of the Digital Signal Converter.
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