Simrad GC80 EXPANDED, GC85 EXPANDED Instruction Manual
INSTRUCTION MANUAL
SIMRAD GC80/85
EXPANDED
Gyro Compass
20221529C English
Simrad GC80/GC85 Expanded Gyro Compass
ii 20221529 / C
Document revisions
Rev Date Written by Checked by Approved by
A 08.01.04
B 17.02.05
C 05.12.05
Document history
Rev. A First issue.
Rev. B Updated for new software release (Master compass: V.1.03, Control
unit: V.1.04).
Rev. C New procedure for how to adjust true heading, updated dimensions for
remote panel, other minor updates to text throughout the manual.
INSTRUCTION MANUAL
20221529 / C iii
About this manual
This manual is intended as a reference guide for installing, operating and maintaining
Simrad GC80 and GC85 Expanded Gyro compasses.
The manual assumes that the operator is a qualified ship officer, or is under supervision
of a qualified person.
In this manual, references to buttons on the operator panels are written in boldface, but
in a different text style (e.g. SET button, DISP button, GYRO button).
Important text that requires special attention from the reader is emphasized as follows:
Note! Used to draw the reader’s attention to a comment or some
important information.
Caution Used for warning the reader that a risk of damage to the
equipment exists if care is not exercised.
WARNING Used when it is necessary to warn personnel
that a risk of injury or death exists if care is
not exercised.
Simrad GC80/GC85 Expanded Gyro Compass
iv 20221529 / C
This manual is divided in the following sections:
1. System overview
An overview of the GC80/GC85 Expanded gyro system and it’s components.
2. User interface
Overview of GC80 Expanded Control unit and the user interface.
3. Operation
Main operating procedures for using the GC80/GC85 Expanded Gyro compass.
4. Maintenance
Simple maintenance procedures that should be performed by the system operator,
together with a complete procedure for how to replace the sensitive element and fuses.
5. Installation
Mechanical installation, cable connection, and software configuration for the
GC80/GC85 Expanded gyro system.
6. Advanced settings
A description of parameters that can be entered or changed in the Extension menu.
7. Technical specifications
Specifications for the system and for all separate units in the GC80/GC85 Expanded gyro
system.
8. Drawings
Outline drawings and wiring diagrams for the GC80/GC85 Expanded gyro system.
9. Spare part list
List of all standard and optional units that are used in the GC80 and GC85 Expanded
gyro systems.
10. Terminal layout
List of all terminal pins and terminal labelling with details on GTERM board in the
GC80 Control unit.
11. Dip switch settings
Drawings and references of jumpers and dip switches for the different printed circuits
boards in the Control unit.
12. Alarm messages and corrective actions
A description of how system errors are indicated, and corrective actions that can be
performed by the operator.
INSTRUCTION MANUAL
20221529 / C v
Contents
1 SYSTEM OVERVIEW...........................................................1
1.1 Introduction.......................................................................2
1.2 Precaution in use................................................................ 3
1.3 System components............................................................4
1.4 Bearing repeaters ...............................................................4
2 USER INTERFACE ..............................................................5
2.1 GC80 Expanded Control unit ................................................6
3 OPERATION.......................................................................9
3.1 System Start-up and Shut-down......................................... 10
Start-Up .................................................................... 10
Turning the Gyro compass OFF...................................... 11
3.2 Selecting active compass ................................................... 12
3.3 Adjusting dimming level .................................................... 12
3.4 Displaying present settings ................................................ 13
3.5 Confirming present settings ............................................... 15
True bearing............................................................... 15
Latitude ..................................................................... 15
Speed........................................................................ 16
3.6 Pendulum function ............................................................ 18
3.7 Alarm messages ............................................................... 19
Acknowledging an alarm .............................................. 20
4 MAINTENANCE ................................................................ 21
4.1 General........................................................................... 22
4.2 Precautions...................................................................... 22
4.3 Cleaning the operator panels and the cabinet surface ............ 22
4.4 Checking the connectors.................................................... 22
4.5 Checking mechanical installation......................................... 22
4.6 Preventive maintenance intervals........................................ 23
4.7 Replacing the Sensitive element ......................................... 23
Mechanical installation ................................................. 23
Verifying the element’s tilt angle ................................... 27
Parameter updates ...................................................... 28
Simrad GC80/GC85 Expanded Gyro Compass
vi 20221529 / C
Balancing the Horizontal ring ........................................ 29
4.8 Replacing the Fuses .......................................................... 30
Master Compass.......................................................... 30
Expanded Control unit.................................................. 31
5 INSTALLATION................................................................33
5.1 Unpacking and handling .................................................... 34
5.2 Mechanical installation ...................................................... 34
Control unit ................................................................ 35
Master compass .......................................................... 37
5.3 Cabling ........................................................................... 38
Power supply .............................................................. 39
5.4 Grounding the units .......................................................... 40
5.5 Dip-switch settings ........................................................... 40
Configuring the Control unit.......................................... 41
External heading sensor ............................................... 42
Pendulum function....................................................... 43
5.6 Installing the Sensitive element .......................................... 44
Verifying the element’s tilt angle ................................... 46
5.7 System start-up and software configuration ......................... 48
System Start-up ......................................................... 48
Configuring the gyro system ......................................... 49
Setting the Latitude input system .................................. 51
Setting the Speed input system..................................... 52
5.8 Balancing the Horizontal ring.............................................. 53
Adjusting True heading ................................................ 53
6 ADVANCED SETTINGS .....................................................55
6.1 General........................................................................... 56
6.2 Using the Extension menu ................................................. 56
6.3 The Extension menu overview ............................................ 57
7 TECHNICAL SPECIFICATION ...........................................63
7.1 Accuracy ......................................................................... 64
7.2 General specification ......................................................... 64
7.3 Input specification ............................................................ 65
7.4 Output specification .......................................................... 66
7.5 Physical Dimensions.......................................................... 67
INSTRUCTION MANUAL
20221529 / C vii
GC80/GC85 Master Compass ........................................67
GC80 Expanded Control Unit......................................... 67
7.6 Power ............................................................................. 68
GC80/GC85 Master Compass ........................................68
GC80 Expanded Control Unit......................................... 68
7.7 Environmental Specification ............................................... 68
GC80/GC85 Master Compass ........................................68
GC80 Expanded Control unit ......................................... 68
8 DRAWINGS .....................................................................69
8.1 Drawings included ............................................................ 70
9 SPARE PART LIST............................................................77
9.1 GC80 Expanded Gyro system ............................................. 78
9.2 GC85 Expanded Gyro system ............................................. 78
9.3 Optional equipment, GC80/85 Expanded system ................... 79
10 TERMINAL LAYOUT .........................................................81
10.1 GTERM board................................................................... 82
TB1 ........................................................................... 82
TB2 ........................................................................... 84
11 DIP SWITCH SETTINGS ...................................................87
11.1 Expanded control unit .......................................................88
GPOWER board ........................................................... 89
GTERM board.............................................................. 90
SCC board.................................................................. 91
SIFC board................................................................. 95
12 ALARM MESSAGES AND CORRECTIVE ACTIONS.............101
12.1 The alarm system........................................................... 102
12.2 Acknowledging an alarm.................................................. 103
12.3 Fault finding .................................................................. 104
Main power failure..................................................... 104
Internal power failure in Control unit............................ 105
Inverter failure ......................................................... 105
Zero cross failure ...................................................... 105
System communication failure .................................... 106
GPS communication or data failure .............................. 106
Simrad GC80/GC85 Expanded Gyro Compass
viii 20221529 / C
Internal communication failure .................................... 107
External bearing sensor failure .................................... 107
LOG (serial) communication or data failure ................... 107
Repeater failure ........................................................ 108
Failure when powering ON the gyro compass ................ 108
12.4 Complete alarm code list ................................................. 109
SYSTEM OVERVIEW
20221529 / C 1
1 SYSTEM OVERVIEW
This section provides an overview of GC80 and GC85
Expanded Gyro compasses and their components.
Simrad GC80/GC85 Expanded Gyro Compass
2 20221529 / C
1.1 Introduction
GC80 and GC85 Expanded Gyro compasses have been
designated for any size of vessels to enhance the navigation
capabilities and reliability. The gyro compasses eliminate the
inconvenience and limitations of magnetic compasses, and
provide a variety of electrical outputs to supply accurate and
consistent heading information to other navigational equipment.
- A GC80 Expanded gyro is designed for vessels with speed
up to 30 knots. The system complies with IMO A.424 (11)
and Wheel Mark Specifications.
- A GC85 Expanded gyro system is suitable for high speed
vessels with speed up to 70 knots. It complies with IMO
A.821 (19) HSC.
GC80 and GC85 Expanded gyro systems have different
sensitive elements, but use the same GC80 Expanded Control
unit. The systems are identified with divergent dip switch
settings in Master compass and in the Control unit.
Note! A GC80 or GC85 system is identified by the labelling on top of
the Master compass’ case as shown on the figure below.
The labelling on the control unit is identical for both gyro
systems.
pfjo^a=d`UR
_lt
SYSTEM OVERVIEW
20221529 / C 3
1.2 Precaution in use
The GC80/GC85 Expanded Gyro compass displays and outputs
bearing information. Although the system continually checks for
faults while the system is running, failures or malfunctions may
occur.
Any errors in input information will generate an alarm. These
errors may also cause large jumps in the output bearing from the
gyro compass. If this happens, any external equipment
depending on the bearing output from GC80/GC85 should be
operated manually or switched to other bearing sensors.
To assure long time safe operation, the following precautions
should be taken:
- Assure that the operator is familiar with the use of the
gyro compass
- Perform daily check to maintain normal system operation.
Refer MAINTENANCE, page 21 onwards
- If any unusual behavior is observed during daily
inspection, the cause should be found and corrected. If
necessary, the local Simrad dealer should be contacted
- If any alarm is generated, verify the reason for the alarm
Simrad GC80/GC85 Expanded Gyro Compass
4 20221529 / C
1.3 System components
A GC80/GC85 Expanded Gyro compass includes the following
units:
- Master Compass with Sensitive Element
- Expanded Control unit
Note! For details, refer TECHNICAL SPECIFICATION, page 63.
1.4 Bearing repeaters
GC80 and GC85 outputs step and serial signals used for
repeaters. Even when the gyro compass is supplied by the
emergency power supply, the connected repeaters will be driven
by the repeater backup function included in GC80/GC85.
If the serial output signal not is used for repeaters, the following
serial signal may be output:
- IEC61162-1 ed.2, close in comparison with NMEA0183
version 2.30 (4800 baud)
- IEC61162-2, based upon NMEA0183 version 2.30
(38400 baud, 9600 baud possible)
These signals may be set separately for each circuit.
For connection of repeaters, refer to wiring diagrams, page 74
onwards.
EXTERNAL HEADING SENSOR
GPS
SPEED
10 X NMEA
4 X 24V STEP
3 X ROT
110/220V AC POWER INPUT
MASTER
COMPASS
EXPANDED
CONTROL
UNIT
ALARM CONTACT
24V DC BACKUP SUPPLY
USER INTERFACE
20221529 / C 5
2 USER INTERFACE
This section gives an overview of the GC80 Expanded
Control unit and the user interface.
Simrad GC80/GC85 Expanded Gyro Compass
6 20221529 / C
2.1 GC80 Expanded Control unit
The Control unit includes the control panel for the gyro
compass.
A flush mount kit (part number 27101757) may be ordered from
Simrad for remote installation of the control panel. Refer Flush
mounting the control panel, page 35.
^i^oj
dvol
buq
afpm pbq
afj
i^jm
qbpq
^`h
bkq
pfjo^a=d`UM
POWER Button
mltbo
Used for switching the gyro system ON. The button will be lit to
indicate that power is applied to the system. Refer System Start-
up and Shut-down, page 10.
Display
The LCD displays data in two rows: the Data indicator row and
the Mode indicator row.
- The Data indicator consists of four 7-segments red
LEDs. The indicator is used for displaying the vessel’s
bearing, latitude and speed. Refer Displaying present
settings, page 13.
The Data indicator is also used for displaying alarm
codes as described from page 18 onwards.
- The Mode indicator consists of three 7-segments green
LEDs. The Mode indicator displays codes used for
identifying input type for bearing, latitude and speed.
GYRO Button
dvol
Used for selecting the gyro compass as the active heading
reference system. The status lamp is lit to indicate that the gyro
system is active.
Refer Selecting active compass, page 12.
EXT Button
buq
Used for selecting the external heading system as the heading
reference. The status lamp will be lit to indicate that the external
heading reference system is active.
Refer Selecting active compass, page 12.
USER INTERFACE
20221529 / C 7
DISP Button
afpm
Used for displaying data on the LCD. Refer Displaying present
settings, page 13.
SET Button
pbq
Used for changing data and input systems. Refer System start-up
and software configuration, page 48 onwards.
ACK/ENT Button
^`h
bkq
Used for confirming a change in data and input systems. Refer
System start-up and software configuration, page 48 onwards.
The button is also used for acknowledging an alarm as described
in Acknowledging an alarm, page 20.
Arrow Buttons
afj
i^jm
qbpq
Used for increasing or decreasing a parameter value. Refer
System start-up and software configuration, page 48 onwards
Also used for lamp test and for setting the display illumination
as described in page 12.
Alarm Indicator
^i^oj
Used for indicating an alarm situation. Refer Alarm messages,
page 19.
Simrad GC80/GC85 Expanded Gyro Compass
8 20221529 / C
THIS PAGE INTENTIONALLY LEFT
BLANK
OPERATION
20221529 / C 9
3 OPERATION
This section describes the main operating procedure used
when operating the GC80/GC85 Expanded Gyro compass.
Simrad GC80/GC85 Expanded Gyro Compass
10 20221529 / C
3.1 System Start-up and Shut-down
A GC80/GC85 Expanded gyro system is usually left with power
on. If the system has to be shut down and restarted, the
procedures in the following sections should be followed.
Start-Up
Caution Before the gyrocompass is turned into normal operation, it has
to be configured according to the description in System startup and software configuration, page 48 onwards.
mltbo
1 Turn ON the gyro system by pressing the POWER button
on the Control panel. The following start-up sequence will
be run:
Control unit type (GC80 Std, or GC85 HSc), SW version for
Control unit and for Master compass is displayed in rapid
succession. Examples of display text are shown below:
OR
GC80 CONTROL
UNIT
STD VERSION
GC80 CONTROL
UNIT
HIGH SPEED
VERSION
SW VERSION
CONTROL UNIT
SW. VERSION
MASTER COMPASS
dvol
2 If the rotor not was completely stopped when the POWER
button was pressed, a rotor break function will be activated
to stop the rotor.
Active rotor break is indicated with flashing display.
3 The sensitive element starts rising horizontally, and the
compass rotates 360° clockwise. The display shows
decreasing bearing as the compass is rotating.
dvol
4 When the rotation is stopped, start bearing is indicated
with flashing text in the display. The start bearing will be
the same as active bearing when the compass was turned
OFF.
OPERATION
20221529 / C 11
dvol
5 The indicated start bearing is accepted by pressing the
ACK/ENT button, or increased/decreased by using the
arrow buttons and then pressing the ACK/ENT button. If
no action is taken within 3 minutes, the start-up process
will continue with the indicated start bearing.
The bearing indication stops flashing when the start
bearing is accepted, while the lamp remains flashing.
6 The rotor will now start rotating, and reaches pre-described
number of revolutions after maximum 30 minutes.
dvol
7 When the rotor has reached full speed, the compass starts
the north seeking rotation. The display will now change to
show the compass’ actual heading, and from now on
bearing output will be available.
The lamp beside the GYRO button change from flashing to
steady light.
The GC80/GC85 will be settled within 3 hours when started
with a deviation angle less than 5°. With a larger deviation
angle, the compass will be settled within 4 hours.
Turning the Gyro compass OFF
mltbo
1 Press the POWER button on the Control panel. The light in
the POWER button will be switched off.
dvol
2 Repress the POWER button to activate the rotor break
function. The light in the POWER button will be lit again.
Active rotor break is indicated by:
- flashing display as shown on the figure
- a soft clicking sound heard from the gyrocompass
The rotor break function will be active for maximum 4
minutes.
Caution It is very important that the rotor break is activated to stop the
rotor rotation. If not, the sensitive element may be damaged!
mltbo
3 Press the POWER button again to shut down the
gyrocompass when both the data and the dot in the display
change from flashing to steady light.
The light in the POWER button will now be turned OFF.
Simrad GC80/GC85 Expanded Gyro Compass
12 20221529 / C
3.2 Selecting active compass
If an external heading sensor is connected to GC80/GC85, it is
possible to switch between gyro and external heading sensor as
active steering sensor.
The gyro system will normally be used with the gyro compass
selected as active compass. An external heading sensor should
only be used as active compass when the gyro compass not is
working properly.
dvol
buq
+
^`h
bkq
By pressing the GYRO or the EXT and the ACK/ENT buttons
simultaneously, the GC80/GC85 will toggle between using the
gyrocompass or an external sensor as active sensor.
When the active sensor is changed, an audible alarm will sound
three times.
Active compass is identified with light in the button’s indicator
lamp, and with active compass type in the LCD as shown in the
figures below.
dvol
j^d
buq
dvol
j^d
buq
GYRO COMPASS SELECTED AS
ACTIVE STEERING SENSOR
EXTERNAL HEADING SENSOR
SELECTED AS
ACTIVE STEERING SENSOR
WARNING Changing active compass may result in large
change of true bearing. No changes should
therefore be made when the system is in
operation.
3.3 Adjusting dimming level
afj
The display illumination and the light intensity in the indicator
lamps can be increased or decreased in 5 steps by pressing the
arrow buttons.
When the illumination is set to lowest level, a faint light is still
present in the display, Alarm indicator, status lamp and Power
button.
Panel lamps and display segments may be tested by pressing
both arrow buttons simultaneously. All lamps and display
segments will be lit, and a short audible alarm will be activated.
OPERATION
20221529 / C 13
3.4 Displaying present settings
afpm
When pressing the DISP button on the GC80 Control unit, the
system will loop through a display sequence showing present
settings for the system.
- The first row in the display will show the value
- The second row displays code used for identification
afpm
True output bearing from active compass
dvol
j^d
buq
dvol
j^d
buq
GYRO COMPASS SELECTED AS
ACTIVE STEERING SENSOR
EXTERNAL HEADING SENSOR
SELECTED AS
ACTIVE STEERING SENSOR
afpm
Bearing from passive sensor
EXTERNAL HEADING SENSOR
IS PASSIVE STEERING SENSOR
GYRO COMPASS IS
PASSIVE STEERING SENSOR
Note! This display is only available when an external sensor is
connected to the GC80/GC85.
afpm
Gyro compass bearing without correction, together with active
speed input system indication (GPS, Manual, Log or Serial
Log)
Simrad GC80/GC85 Expanded Gyro Compass
14 20221529 / C
afpm
Latitude for the vessel’s current position. Value indicated as
North (n) or South (s) latitude
NORTH LATITUDE SOUTH LATITUDE
afpm
Vessel speed. GPS, Manual, Log or Serial Log may be selected
as speed input system
afpm
Rate of turn in °/min.
afpm
Error codes (up to 4), and error indication.
OPERATION
20221529 / C 15
3.5 Confirming present settings
After the GC80/GC85 is configured according to the System
start-up and software configuration, described in page 48
onwards, it should not be necessary to adjust any settings when
operating the gyro compass.
However, if an error is reported in any of the input systems, it
may be necessary to switch to a different input system.
True bearing
Make sure that the gyro compass is selected as active compass.
Refer Selecting active compass, page 12.
dvol
Confirm that the gyro compass’s displayed true bearing is the
same as a known target or astronomical observation.
If there is any difference, adjust the bearing according to
Adjusting True heading, page 53.
Latitude
Press the DISP button until the vessel’s latitude is displayed.
The displayed latitude value is calculated based on the vessel’s
true bearing and the vessel’s actual speed. Refer setting the
latitude input system and speed input system, page 51 onwards.
- If GPS is selected as latitude input system, the latitude
obtained from the GPS is displayed on the LCD. Confirm
that the displayed latitude is the same as indicated on the
GPS indicator.
- If GYRO is selected as latitude input system and other
than MANUAL selected as the vessel’s speed input
system, the latitude will be automatically updated. In this
case, the indicated latitude should be confirmed every 4ht
hour when the vessel is in harbor. If there is any difference
between the displayed value and the vessel’s actual
latitude, the value should be adjusted according to Setting
the Latitude input system, page 51.
Note! When GYRO is selected as latitude input system and MANUAL
is selected as the speed input system, the indicated latitude value
will not be updated.
Simrad GC80/GC85 Expanded Gyro Compass
16 20221529 / C
Speed
The GC80/GC85 gyro compass calculates bearing based on the
speed and latitude information that is input to the gyro system.
Any errors in speed input will therefore cause incorrect true
bearing from the gyro compass.
Press the DISP button until the vessel’s speed information is
displayed.
Confirm in 4 hours intervals that the displayed speed is the same
as the vessel’s actual speed.
Any discrepancy between displayed speed and actual speed is
corrected as described in Setting the Speed input system, page
52.
Speed error correction
Any gyro compass will generate a heading error caused by
vessel speed and the earth rotation. GC80/GC85 calculates this
error based on latitude and speed input information, and corrects
automatically the bearing signal output. If no speed information
is available, the gyro compass will output a heading error either
westwards or eastwards depending on the vessel’s course.
If speed information is unavailable, the figure on next page
could be used for manually calculating the heading error.
In this figure, the following values are used as example:
- Latitude: 40°
- Vessel speed: 16 knots
- Vessel heading: 30°
The heading error is found by:
1 Drawing a line between the latitude and the vessel heading
(shown with gray line on the figure)
2 Drawing a straight line (broken line in the figure) between
the vessel speed and the point where the latitude/heading
line intersects with the solid black line in the figure.
In the example above, the figure shows a speed error of appr.
1.1°, and the true bearing should then be 30°-1.1° = 28.9°.
Note! When the course is within 270° - 0° - 90°, true heading is found
by subtracting the speed error from the compass heading.
If the course is within 90° - 180° - 270°, true heading is found
by adding the speed error to compass heading.
OPERATION
20221529 / C 17
VESSEL HEADING (degree)
VESSEL SPEED (knots)
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
90 80 70
60 50 40 30 20 10
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
90 - 90 - 270 - 270
80 - 100 - 260 - 280
0 - 180 - 190 - 0
70 - 110 - 250 - 290
60 - 120 - 240 - 300
50 - 130 - 230 - 310
40 - 140 - 220 - 320
30 - 150 - 210 - 330
20 - 160 - 200 - 340
10 - 170 - 190 - 350
(+)
(+)
( )
( )
SPEED ERROR (degrees)
LATITUDE (degrees)
Simrad GC80/GC85 Expanded Gyro Compass
18 20221529 / C
3.6 Pendulum function
GC80/85 software includes a pendulum function that enables the
heading to be changed by 180°.
The heading change is activated by closing a potential free
contact connected between TB1, pin 71 and 72 on the GTERM
board in GC80/85 control unit.
Note! To identify the function, S2-4 on the SCC board has to be set to
ON. Refer DIP switch settings on SCC board, page 91 onwards.
When the switch is activated, the following actions are
performed:
- The compass heading and repeaters start to change
towards the new 180° shifted heading
- An acoustic alarm sounds 5 times
- The dots in the indicator field in the display starts flashing.
These will remain flashing for as long as the pendulum
function is active.
Normal compass operation is resumed by opening the closed
potential free contact. The function is indicated by the same
acoustic alarm, and the flashing dots returns to fixed illuminated
dots.
OPERATION
20221529 / C 19
3.7 Alarm messages
The GC80/GC85 system will continually check for faults while
the system is running.
If a fault occurs, an alarm code will be displayed in the LCD, the
Alarm lamp will be flashing, and an audible alarm will be
activated.
Up to 4 alarm codes may be displayed in the LCD to indicate
that several alarm situations are present. The last activated alarm
will be displayed on the right side of the display. The figure
shows that alarm with code 1, 3 and 2 were generated in that
order.
^i^oj
If more than 4 alarms are active, this will be indicated with a dot
behind the last number as shown on the figure below. Further
alarm codes may then be displayed by pressing the “arrow up”
button.
The example shows that alarm code 2, 3, U, d and 7 were
activated.
Caution When an alarm is generated, bearing information from the
GC80/GC85 may not be present or may have large error. Any
equipment using bearing information from the gyro compass
should therefore immediately be operated according to the
equipment’s emergency operating procedure.
Simrad GC80/GC85 Expanded Gyro Compass
20 20221529 / C
Acknowledging an alarm
^`h
bkq
An alarm is acknowledged by pressing the ACK/ENT button on
the control panel, or on an external acknowledge button is this is
installed.
- The audible alarm will be silenced
- If the alarm situation has disappeared, the alarm lamp will
be switched off, and the alarm code will be removed from
the LCD
- If the alarm situation continues, the alarm lamp will switch
from flashing to steady light. The LCD will return to show
true bearing with flashing numbers to indicate that the
bearing may have large errors
An alarm code for an active error may be recalled by pressing
the DISP button until the alarm display is shown. It is possible
to recall any alarm code in the LCD for as long as the alarm
situation is present.
The Complete alarm code list section, page 109, has a complete
list of alarm codes.
Buzzer silence only
By installing an external acknowledging switch, it is possible to
silence the buzzer while the alarm code remains in the display.
Install the switch to the control unit according to the Wiring
diagram on page 74 onwards.
Note! Could only be used if no pendulum switch is installed!
MAINTENANCE
20221529 / C 21
4 MAINTENANCE
This section holds descriptions for maintenance procedures
that should be performed by the system operator.
The section also includes a detailed description for how to
replace the sensitive element and the fuses.
Simrad GC80/GC85 Expanded Gyro Compass
22 20221529 / C
4.1 General
All units in the GC80 system are designed for optimum safety
and reliability. However, a limited amount of preventive
maintenance should be performed to verify safe operation and
durability.
If any strange motion, smell, sound or heat is generated from
any unit, a Simrad dealer shall be contacted.
4.2 Precautions
Touching internal parts may cause electric chock if power is
connected to the system, even if the POWER button is turned
OFF. Do not touch any terminal board or power supply unit
when maintaining and checking the system. If necessary,
disconnect the power cable from the Control unit.
Electrostatic charges may damage components on the circuit
boards inside the units. Always wear a correctly connected
earthing strap when opening the units.
4.3 Cleaning the operator panels and the cabinet
surface
Use a vacuum cleaner with a soft brush to avoid damage to the
buttons and the panel. If required, clean the buttons and panel
with a non-abrasive cloth moistened with mild soap solution.
4.4 Checking the connectors
The connectors should be checked by visual inspection only.
Push the connector plugs into the connector. If the connector
plugs are equipped with a lock, ensure that this is in correct
position.
4.5 Checking mechanical installation
Vibration and chock may cause mechanical parts to loosen. All
fastening screws should therefore regularly be checked and
eventually tightened.
Loading...