Offshore NMEA2000 RELAY OUTPUT MODULE 8 User manual

NMEA2000® RELAY OUTPUT MODULE 8
Part Numbers: 3478
USER MANUAL
Revision 1.20
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Contents
1 Introduction .........................................................2
1.1 Firmware Revision ..............................................2
1.2 Product Features ............................................... 2
2 Installation ...........................................................3
2.1 Unpacking the box...............................................3
2.2 Mounting the unit .............................................. 3
2.3 Connecting the NMEA2000 Cable ......................... 3
2.4 Connecting the relay cables to the WAGO socket.....3
3 Conguration.........................................................5
4 Operation ............................................................ 6
5 Maintenance ........................................................ 7
6 Technical Specication ..........................................8
7 Troubleshooting/FAQ ........................................... 10
8 Warranty ............................................................11
9 Technical Support ................................................12

INTRODUCTION
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The Offshore System’s NMEA2000® 3478 Relay Output Unit 8 is designed to control up to 8
seperate isolated DC or AC circuits from controllers on the NMEA2000® network.
This unit is designed to operate in a protected marine environment such as an engine room. It is
very important that it is installed and set up correctly according to this manual. Please read and
follow the installation and setup instructions carefully to achieve the best results.
1.1 Firmware Revision
The information in this manual corresponds to rmware revision 2.0.1
1.2 Product Features
The NMEA2000® 3478 Relay Output Module 8 has the following features:
● 8 Fully Isolated 16A 250 VAC, 8A 35 VDC Relays with
Changeover Contacts
● Each relay circuit has a green indicating LED
● User Settable Switch Bank Instance using rotary switches
● Heartbeat blue LED conrming NMEA transmission.
● NMEA2000 micro C interface plug

INSTALLATION
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2.1 UNPACKING THE BOX
You will nd the following items in the 3340 shipping box:
1 x 3478 NMEA2000® Relay Output Module 8
1 x 3478 User Manual (This document)
2.2 MOUNTING THE UNIT
The unit should be mounted to a at surface using 4 x M4 mounting screws. The unit
dimensions and mounting hole locations are shown on the following drawing.
2.3 CONNECTING THE NMEA2000 CABLE
The unit is connected to the NMEA2000 network by the 5 way micro C socket on the front.
Carefully attach the network drop cable to this plug and hand tighten until it it is fully seated.
Take care to match the orientation of the pip inside the socket to the recess inside the drop
cable plug. The other end of the drop cable should be connected to a suitable Tee connector on
the NMEA2000 network backbone cable.
2.4 CONNECTING THE SENSOR CABLES TO THE WAGO SOCKET
WARNING: Risk of Electric Shock
This device contains potentially hazardous voltages. Ensure that power is removed from all AC
circuit that will be connected to the AC monitor. Do not attempt to disassemble the device.
This device contains no user serviceable parts. Connecting the AC monitor must be performed
by QUALIFIED ELECTRONICS ENGINEER ONLY.

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The cables from the power-source to the external sockets are connected using the 6 x 2way
WAGO Cage Clamp terminal block. The wire should be stripped for 8mm and then the cage
clamp opened with a small screwdriver in the slot above the wire connection. Then simply
insert the wire into it’s connection slot and release the cage clamp by removing the small screw
driver. This will produce a secure gas tight connection on wire sizes from 0.08 – 2.5 mm²
Note:
When using the 3478 Relay Output Module to switch inductive loads such as transformers,
electric motors or solenoids external EMI (electromagnetic induction) protection is required.
For AC inductive loads we recommend to place a properly rated MOV (metal-oxide varistor)
across the load in parallel with series RC snubber (i.e. a 0.1uF polypropylene capacitor of
sufcient voltage and a 47 Ohm 1 Watt carbon lm resistor).
For DC inductive loads we recommend to place a diode across the load (i.e. 1N4006). Be sure to
observe proper polarity.
Any suppression device must be placed as close as possible to the inductive load.
It is the customers responsibility to provide suitable EMI suppression around inductive load.
NORMALLY CLOSED
CONNECTIONS
NORMALLY OPEN
CONNECTIONS
COMMON
CONNECTIONS
RELAY 1 RELAY 8
The terminal connections are
numbered as follows:
AC LOAD
MOV
RRC
D
(+)( -)
DC LOAD
C

CONFIGURATION
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It is possible to install a number of 3478 Relay Output Modules (or Switch Bank Modules) on a
NMEA2000® network so they need to each have a unique Device Instance Address which is set
using the two small rotary switches on the front of the unit.
Valid Device Instances are “00” through to “FC”. The switches are simply turned to the desired
Device Instance with a small screwdriver.
As the Relay Output Module is being controlled by other devices on the network it is important
to ensure that the Device Instance chosen matches the Device Instance being controlled on the
controlling unit.

OPERATION
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The 3748 unit operates each relay as commanded. When a relay is operated then the matching
green LED in front of the WAGO terminal block is illuminated.

MAINTENANCE
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●Clean the unit with a soft cloth.
●Do not use chemical cleaners as they may remove paint or markings or may corrode
the enclosure or seals.
●Ensure that the unit is mounted securely and cannot be moved relative to the mounting
surface. If the unit is loose, tighten the mounting screws.
●Check the security of the cables connected to the NMEA 2000 connector, tighten if
necessary.
●Check the security of the cables connected to the WAGO terminal block, reseating them if
necessary.

TECHNICAL SPECIFICATION
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As Offshore Systems are constantly improving their products specications are subject to
change without notice. Offshore System’s products are designed to be accurate and reliable
however they should only be used as aids to navigation and not as a replacement for traditional
navigation aids and techniques.
Relay Outputs
Certications
NMEA2000® Parameter Group Numbers (PGNs)
Parameter Comment
8 Independent Relay Outputs Fully Isolated, SPDT contacts
DC Power Rating 8 Amps at 35 Volts DC resisitive load
AC Power Rating 16 Amps at 250 Volts AC resistive load
Wire Sizes 0.08 – 2.5mm² section
Parameter Comment
NMEA2000 Level B
Maritime Nav and RadioComm Equipment IEC60945
CE and FCC Electromagnetic Compatibility
Type PGN No PGN Name
Command PGN 127502 Switch Bank Control
Monitor PGN127501 Switch Bank Status (Every 2 secs)
Protocol PGN126464 Tx/Rx PGN List
PGN126996 Product Information
PGN059392 ISO Acknowledge
PGN059904 ISO Request
PGN060928 ISO Address Claim
PGN126208 Command/Request Group