NAV4 Plus User Guide Issue 2 - ICS Electronics Limited

NAV4plus User Guide
Safety Warning
The ICS NAV4plus has been designed and manufactured to be completely safe
when installed in accordance with these installation instructions.
It is essential that a fuse or circuit breaker be installed in the supply cable. The
NAV4plus is supplied with a DC power cable and in-line 2.5 amp fuse. It is
essential that this fuse is included in the finished installation.
NAV4plus Interface Connections
The Nav4plus rear panel connections are :
Pin Function
1 Antenna
2 Antenna ground
3 Not used
4 Not used
5 NMEA B (negative)
6 NMEA A (positive)
7 0V power input
8 12V/24V power input
9 Not used
10 Not used
• The label on the rear of the Nav4plus identifies each connection
• Pin 1 is located closest to the edge of the NAV4plus case
• The power supply input should be within the range 10 – 30Vdc
A grounding link wire is fitted between the antenna cable screen (pin
2) and the battery negative input (pin 7).
• You may need to remove the grounding link wire altogether if the
vessel has an isolated battery supply fitted with an earth leakage
alarm circuit. In this case a 0.1µF capacitor should be connected
between pin 2 and pin 7 on the connector block. An automotive
style capacitor of the type normally used to suppress
interference from electric motors with a rating of at least 50Vdc is
suitable. This will provide an effective antenna ground
connection
• without grounding out the vessel’s battery supply
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