Simrad AR77 User manual

INSTRUCTION MANUAL
Simrad AR68/AR77
Analog repeaters
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Simrad AS makes every effort to ensure that the information contained within this
document is correct. However, our equipment is continuously being improved and
updated, so we cannot assume liability for any errors which may occur.
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The equipment to which this manual applies must only be used for the purpose for which
it was designed. Improper use or maintenance may cause damage to the equipment or
in ury to personnel. The user must be familiar with the contents of the appropriate
manuals before attempting to operate or work on the equipment.
Simrad AS disclaims any responsibility for damage or in ury caused by improper
installation, use or maintenance of the equipment.
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© 2002 Simrad AS
The information contained within this document remains the sole property of Simrad AS.
No part of this document may be copied or reproduced in any form or by any means, and
the information contained within is not to be communicated to a third party, without the
prior written consent of Simrad AS.

Instruction manual
20220927 / D 1
Instruction manual
AR68/AR77 Analog repeaters
This manual is intended as a reference guide for operating
and correctly installing the AR68 and the AR77 Analog
Repeaters.
Please take time to read this manual to get a thorough
understanding of the system components and the
connection to external equipment.

Simrad AR68/AR77 Analog repeater
220220927 / D
Document revisions
Rev Date Written by Checked by Approved by
A 03.01.01 NG VP TR
B 02.04.01 NG TR
C 21.11.01 AEET VP TR
D 26.02.02
Document history
Rev. A First issue.
Rev. B Product name changed from SR77 to AR77.
Rev. C Description for AR68 included.
Rev. D Technical description updated. Minor revisions to other pages
To assist us in making improvements to the product and to this manual, we would
welcome comments and constructive criticism. Please send all such - in writing to:
Simrad Egersund AS
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P.O. Box 55
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-4379 Egersund, Norwa
y
or by e-mail to:
[email protected]

Instruction manual
20220927 / D 3
Contents
1 INTRODUCTION ............................................................... 5
2 TECHNICAL SPECIFICATIONS........................................... 6
2.1. Physical .......................................................................................................... 6
AR68......................................................................................................................... 6
AR77......................................................................................................................... 6
2.2. Electrical ........................................................................................................ 6
2.3. Environment................................................................................................... 7
2.4. Operational features ....................................................................................... 7
AR68......................................................................................................................... 7
AR77......................................................................................................................... 7
3 OPERATION.................................................................... 10
3.1. Dimmer button ............................................................................................. 10
3.2. Defining input signal.................................................................................... 10
4 INSTALLATION............................................................... 11
4.1. General information ..................................................................................... 11
4.2. Location of the unit...................................................................................... 11
4.3. Mechanical installation ................................................................................ 11
Bulkhead mounting................................................................................................. 11
Panel mounting ....................................................................................................... 12
4.4. Electrical installation ................................................................................... 12
4.5. Commissioning ............................................................................................ 13
5 FAULT FINDING.............................................................. 14

Simrad AR68/AR77 Analog repeater
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Instruction manual
20220927 / D 5
1INTRODUCTION
The AR68 and the AR77 has been designed to accept a variety
of digital inputs that are sensed when first switching on the
repeater.
The repeater accepts serial data (RS422). The D-type connector
has pins allocated for power and serial data.
The serial input is configured to recognize NMEA 0183 HDT,
HDG and HDM sentence structures in priority order.

Simrad AR68/AR77 Analog repeater
620220927 / D
2TECHNICAL SPECIFICATIONS
2.1. Physical
AR68
Dimensions: .................................................See Figure 1, page 8
Weight (nominal): ............................................................... 2.9 kg
Mounting:.......................................... Panel or bulkhead mounted
Finish:......................................................Satin black (RAL 9005)
Construction:...............................................Aluminium enclosure
Connections:........1x6 way screened cable (15 way D-type fitted)
Compass safe distance: ........................................................... 2 m
Cable: ................................... 2.5 m tailed with D-Type connector
AR77
Dimensions: .................................................See Figure 2, page 9
Weight (nominal): ............................................................... 1.9 kg
Mounting:.......................................... Panel or bulkhead mounted
Finish:....................................................... Black (NCS S 9000-N)
Construction:...............................................Aluminium enclosure
Connections:........1x6 way screened cable (15 way D-type fitted)
Compass safe distance: ........................................................... 2 m
Cable: ................................... 2.5 m tailed with D-Type connector
2.2. Electrical
Power supply:....................................................... 24 VDC 0.75A
Data input:.......................................................................... RS422
NMEA 0183 4800, baud, no priority, 1 stop bit
HDT
HDG
HDM

Instruction manual
20220927 / D 7
2.3. Environment
Environmental protection:......................................................IP54
Temperature: .......................................................... -5°C to +50°C
2.4. Operational features
AR68
Performance: .........................................................................±0.1°
Follow up rate: ...................................................................... 12°/s
Dial Resolution:
Outer dial...................................................... Marked to 1°
Inner dial ................................................... Marked to 0.1°
AR77
Performance: .........................................................................±0.5°
Follow up rate: ...................................................................... 12°/s
Dial Resolution: ....................................................... Marked to 1°

Simrad AR68/AR77 Analog repeater
820220927 / D
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SIMRAD
Vishey Sfernice PE30 Series2K2 3 Wa tt
192
192 209
234 97
186
163
80
50
122
77
Figure 1
AR68 Dimensions
PANEL CUT-OUT:
187x187mm.
ALLOW 90MM
CLEAR FOR D-TYPE
CONNECTOR AND
CABLE BEND.

Instruction manual
20220927 / D 9
Vishe y Sfe rn ic e PE30 Se ri e s 2K2 3 Wa t t
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144 160
188 97
138
128
50
122
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Figure 2
AR77 Dimensions
PANEL CUT-OUT:
139x139mm.
ALLOW 90MM
CLEAR FOR D-TYPE
CONNECTOR AND
CABLE BEND.

Simrad AR68/AR77 Analog repeater
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3OPERATION
3.1. Dimmer button
One single rotary button is used for adjusting the background
illumination on the AR68 and AR77 panels. Rotating the button
in a clockwise direction will increase the light intensity, while
the light intensity will be decreased when the button is turned
counter-clockwise.
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3.2. Defining input signal
Both AR68 and AR77 have been designed to accept a variety of
digital input signals. When the cable is connected to the
repeater, it will automatically sense which digital signal that is
present. The following priority is used when defining the signal:
−True heading (HDT)
−Heading & Variation format (HDG)
−Old Heading format (HDM)
If the signal is invalid or missing after 1 second, the repeater will
indicate this by flashing illumination and by rotating the dial
back and forth +/-35° around the last known heading.
If the defined input signal is lost, the power must be switched off
and on again. If the cable not is connected via an external
switch, the cable must be disconnecting and reconnected again
to define a new input signal.
DIMMER BUTTON

Instruction manual
20220927 / D 11
4INSTALLATION
4.1. General information
Care should be taken when unpacking and handling the
equipment. A visual inspection should be made to see that the
equipment has not been damaged during shipment and that all
components and parts are present.
4.2. Location of the unit
The analog repeater should be mounted where it is most
convenient for the user, and with regard to the unit’s
environmental protection and temperature range. The unit
should not be installed in area exposed to heavy vibrations.
Make allowances for working area around the unit when routing
or removing the cable.
4.3. Mechanical installation
Refer dimensional drawings on page 8 and page 9.
Bulkhead mounting
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1. Locate the cradle on the mounting site and mark the
holes for the fixing screws on the mounting surface.
2. Drill the mounting holes and screw the cradle to the
mounting surface.
3. Assemble the AR68/AR77 to the cradle with the
two knobs and adjust the unit to obtain the best
viewing angle.

Simrad AR68/AR77 Analog repeater
12 20220927 / D
Panel mounting
Vishe y Sf er nic e PE30 Seri e s 2K2 3 Wa tt
1. Cut a hole in the panel where the AR68/AR77 is to be
fitted. For panel cut-out dimensions, refer to drawings on
page 8 and page 9.
2. Locate the unit in the hole.
3. Use the enclosed mounting bracket, studs and wing nuts to
clamp the unit firmly in the panel as shown on the figure.
4.4. Electrical installation
Caution! Any voltage supplies other than those stipulated in the product
specification may cause damage to the repeater.
The AR68/AR77 is designed to run on 24VDC and accepts a
digital data RS422 signal.
The incoming cable to the repeater has a 15 pin female D-type
connector. The cable is supplied pre-wired with a 2.5 m length
of six connector screened cables, to which the ship’s cable is
connected.
Note! It is recommended to connect the AR68/AR77 via an external
switch for the possibility to reset the unit.
The following table indicates the function of all cores and their
identification.
Function D-type
connector pin
Wire colour (as
supplied)
Ships cable
(to be filled out for
reference by installer)
24 VDC 1 Red
DC Return 9 Black
Data positive (TDA) 3 Green
Data negative (TDB) 11 Blue
Screen 8 Green/Yellow

Instruction manual
20220927 / D 13
4.5. Commissioning
Perform the following tests when commissioning each repeater:
1. Ensure that the preceding installation and electrical
connection has been completed successfully.
2. Connect the cable to the AR68/AR77. The repeater will
automatically sense which digital signal that is present.
3. The repeater will align itself to zero and then to the
transmitted gyro heading.
4. Ensure that the lighting is set to a suitable level. Adjust if
necessary with the dimmer button.

Simrad AR68/AR77 Analog repeater
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5FAULT FINDING
Note! The AR68/AR77 is a sealed unit, and breakage of the security
seal will invalidate the warranty.
If trouble is encountered, make preliminary checks as described
below. If the problems remain unsolved, contact your nearest
Simrad dealer for assistance.
Symptom Probable fault Remedy
AR68/AR77 does not
operate.
No power or miswired power
connection.
Check incoming power
supply.
The repeater aligns
itself to zero and does
not respond to heading
input.
The dial rotates +/- 35°.
The digital signal to the repeater is
either not present or the sentence
being sent is incorrect or has wrong
polarity.
Switch the unit off and on
again.
Lighting not visible Damage to internal LED.
Damage to internal PCB.
Return to Simrad dealer for
service.