Silva NX2, Service Manual

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10geninfNX2.doc Page 1 Latest update: 17 Feb - 03
1. GENERAL INFORMATION
The Silva NX2 system is based round a central network manager, i.e. the Server,
see § 2.3. All transducers are connected to the Server which transmits data on a
Bus to all connected instruments.
In a limited system also the Wind Data, Compass Data and AUTOPILOT servo
can be the network manager.
The communication is of bus type, which means that information is transmitted
constantly and that each instrument reads the bus to collect data. The bus is RS
485. See § 2.
Silva NX2 can have a maximum of 32 communicating units, such as instruments,
Autopilot etc.
The NX2 Speed instrument can also work stand-alone, in this case the Log
transducer is connected direct to the instrument.
When upgrading with a Server the connection of the Log transducer should be
moved to the Server.
Silva NX2 instrument series is build according to IP68/IP66 standard which
means that the instruments are sealed and can not be opened.
Before starting a service procedure, check that the customer has all basic
settings correct.
Remedy in a NX2 system with customer claim should always start with a
thorough check according to the checkpoint list, see § 5.5 NX2 Faultfinding
Guide.
In most instances, repair is effected by replacing the defective unit with SILVA
NX2 exchange system. The Server and Wind, Compass and GPS transducers
can be repaired.
The water moisture, which all marine equipment are exposed to, have been
closely investigated. The following details will prevent moisture problem:
•
Instrument front and window are produced as one pies in a new double
moulding technology giving no possibility for water intrude of the front.
•
Push buttons are made out of a new silicone material.
•
The Instrument front and the back cover are integrated in a new gluing robot
•
No mounting screws through the front eliminates water ingress of the
instrument.
• The absence of an instrument gasket eliminates any possibility for water
ingress of the front.
•
A Gore-tex

membrane, covers a venting hole in the back cover. This will give
possibility for pressure balancing and air to circulate in a slow tempo, avoiding
sudden changes with the risk of moisture in the instrument.