RGC50 Instruction Manual

INSTRUCTION MANUAL
SIMRAD RGC50
Gyro compass
20220356 / D
English
Instruction Manual
RGC50 Gyro Compass
This manual is intended as a reference guide for operating
and correctly installing the RGC50 Gyro compass.
Please take time to read this manual to get a thorough
understanding of the operation and system components and
their relationship to a complete RGC50 system.
Simrad RGC50 Gyro compass
Document revisions
Rev
Date
Written by
Checked by
Approved by
11.90
04.06.02
10.01.03
05.10.06
29.02.08
NG
TJ
JME
Document history
Rev.
First edition
Rev. A
New layout. Modified text.
Rev. B
Schematic for Static Inverter updated (page 92).
Rev. C
New version of Switch Panel (page 84 and 93). Minor corrections in text.
Rev. D
New Inverter PCB. New potentiometer in dimmer circuit.
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:
Navico Egersund AS
Nyaaskaiveien 2
N-4370 Egersund, Norway
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Instruction manual
Contents
1
GENERAL INFORMATION...................................................1
1.1
How to use this manual ..................................................................................1
1.2
Equipment supplied ........................................................................................1

Optional Equipment.................................................................................................. 2
OPERATION.......................................................................3
2.1
Operating method with timer..........................................................................3
2.2
Operating method without timer.....................................................................4
2.3
Turn Off ..........................................................................................................4
2.4
Connecting an NMEA repeater ......................................................................4
2.5
NMEA repeater syncronization ......................................................................4
2.6
Speed error correction ....................................................................................4
TECHNICAL SPECIFICATIONS ...........................................7
ASSEMBLY AND INSTALLATION ........................................9

4.1
Preparation for installation .............................................................................9

Warnings................................................................................................................... 9
Electrical warnings ....................................................................................9

Transportation warnings ............................................................................9
Unpacking a new unit ............................................................................................... 9
Standard equipment supplied...................................................................10

RGC50 Assembly instructions.................................................................10
4.2
Mechanical mounting ...................................................................................16

Recommended mounting locations......................................................................... 16
Precautions...............................................................................................17
RGC50 Mounting Orientation and placement .........................................17
4.3
Running test..................................................................................................17
4.4
Checking and correction of errors ................................................................18
4.5
Checking the timer........................................................................................18
4.6
General information about RGC50 signal output and connected equipment19
PRINCIPLE OF OPERATION .............................................21

5.1
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Master Compass ...........................................................................................21
iii
Sensitive element .................................................................................................... 21
Gyro rotor and Damping weight ..............................................................21

Vertical Ring, Suspension wire and Level...............................................22
Follow up transformer..............................................................................23
Liquid ballistic .........................................................................................23
Horizontal ring .........................................................................................24
Follow-Up mechanism............................................................................................ 24
Phantom ring, Servo motor and Gear mechanism ...................................24

5.2
6
Inverter unit ..................................................................................................24
ADJUSTMENT ..................................................................25
6.1
Master compass ............................................................................................25

Adjusting the torsion of the suspension wire.......................................................... 25
Balance adjustment................................................................................................. 25
Vertical balance (east-west direction) .....................................................25

General balance........................................................................................26
Checking position of the pick-up transformer .........................................26
Heading adjustment procedure ............................................................................... 27
Heading error less than 2 degrees..........................................................27

Heading error greater than 2 degrees.....................................................27
Damping adjustment ................................................................................29
Servo amplifier ....................................................................................................... 30
6.2
Inverter board ...............................................................................................31

Voltage adjustment ................................................................................................. 31
Frequency adjustment............................................................................................. 31
MAINTENANCE ................................................................33
OVERHAULING ................................................................35
8.1
Precautions....................................................................................................35
8.2
Special tools/units for adjustment.................................................................35

Special tools............................................................................................................ 35
8.3
Disassembly..................................................................................................37
Sensitive Element ................................................................................................... 37
Removing sensitive element ....................................................................37

Cleaning and lubricating method for the gimbal ring bearing.................38
Disassembling horizontal ring .................................................................39
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Instruction manual
Disassembling liquid ballistic..................................................................40

Disassembling vertical ring .....................................................................40
Cleaning and lubricating bearing of horizontal and vertical axes ...........43
Disassembling rotor .................................................................................44
Master Compass...................................................................................................... 46
8.4
Assembling ...................................................................................................46
Sensitive element .................................................................................................... 46
Assembling Rotor ....................................................................................46

Assembling the vertical ring ....................................................................48
Assembling the liquid ballistic assembly.................................................49
Assembling the horizontal ring................................................................49
Mounting sensitive element .....................................................................50
8.5
Adjustment....................................................................................................50
8.6
Final confirmation ........................................................................................51
8.7
CHECK SHEET FOR RGC50 .....................................................................52

Mechanical Inspection ............................................................................................ 52
Sensitive element .....................................................................................52

Master compass........................................................................................52
General inspection .................................................................................................. 53
TROUBLESHOOTING........................................................55
10 PARTS LIST .....................................................................61

10.1 General..........................................................................................................61
10.2 Spare parts ....................................................................................................61
10.3 Parts List .......................................................................................................61
10.4 RGC50 Master Compass ..............................................................................62
Sensitive Element ................................................................................................... 63
Gyro Assembly ........................................................................................64

Vertical Ring Assembly...........................................................................65
Horizontal Ring Axis ...............................................................................69
Phantom Ring Assembly ........................................................................................ 71
Binnacle .................................................................................................................. 73
Azimuth Motor Assy ..............................................................................76

Transmitter assy .......................................................................................77
Follow-up amplifier PCB.........................................................................78
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Cover Assy ............................................................................................................ 79

Buffer Amplifier PCB............................................................................................. 80
10.5 Static Inverter ...............................................................................................81

Switch Panel Assy ................................................................................................. 82
Chassis Assembly ................................................................................................... 86
Inverter board PCB ..................................................................................87

11 DRAWINGS .....................................................................88
11.1 General..........................................................................................................88
11.2 RGC50 dimensions.......................................................................................89
11.3 Master compass schematic diagram ..........................................................90
11.4 RGC50 Block diagram ..............................................................................91
11.5 Static Inverter ...............................................................................................92
Main terminal connections ..................................................................................... 94
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General information
1 GENERAL INFORMATION
1.1
How to use this manual

This manual is intended as a reference guide for operating and
correctly installing the RGC50 gyrocompass. The RGC50 is a
compact gyrocompass, designed to enhance the navigation
capabilities on small commercial, fishing vessels, and large
pleasure yachts. A gyrocompass eliminates the inconvenience
and limitations of magnetic compasses, and provides a variety of
electrical outputs to supply accurate and consistent heading
information to other navigation equipment. The capabilities and
precision of the RGC50 will provide exceptional heading
information to the navigation equipment installed on your
vessel.
Even if you are a previous owner of a gyrocompass, it is highly
recommended that you review the instruction manual thoroughly
before using the RGC50.
1.2
Equipment supplied
The basic RGC50 gyrocompass consists of:
RGC50 Master compass unit
Inverter unit, including power converter and control panel
Viewing screen (plastic piece that fits on top of master

compass)
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Optional Equipment
Several Simrad repeaters are available as options to the basic
RGC50 gyrocompass:
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Operation
2 OPERATION
RUN
FUSE
TIMER
ETD
FUSE
DIMMER
OFF
PRESENT TIME
RUN
Figure 2-1 Gyrocompass control panel
2.1
Operating method with timer

The RGC50 has the capability of being turned on automatically
at a specified time by a TIMER function within a 24-hour time
frame period.
1.
Set the master switch (1) to the TIMER position.
2.
Set the PRESENT TIME setting scale plate (2) to the

present time.
3.
Set the ETD setting knob (3) to the scheduled ETD

(estimated time of departure) on the PRESENT TIME
setting scale plate (2).
The red Timer running lamp (4) lights.
By the above operations, the gyrocompass will be operative at

the scheduled ETD. About four hours before scheduled ETD,
the gyrocompass will be started. The green running lamp (5)
lights.
4.
When ETD comes, set master switch (1) to RUN position.

The red Timer running lamp (4) goes out.
Note!
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Within about four hours after the scheduled ETD, be sure to

perform operation 4 above. If this operation is not performed,
the gyrocompass operation will stop automatically. Therefore,
when the departure schedule is changed or cancelled, it is not
necessary to operate master switch (1).
2.2
Operating method without timer

1.
Set master switch (1) to RUN position.

The green running lamp (5) lights.
By the above operation, the gyrocompass will be operative after

about four hours.
2.3
Turn Off
1.
Set master switch (1) to OFF position.

The green running lamp (5) goes out.
The RGC50 will take a period of time to come to a complete

stop after the switch is set to OFF. This is normal, as the high
speed rotor takes time to stop the rotation after power is turned
off.
2.4
Connecting an NMEA repeater

To connect an NMEA repeater, a signal interface unit should be
used to connect the synchro signal to NMEA signal. To operate
several repeaters (radar etc.) an NMEA buffer is recommended.
2.5
NMEA repeater syncronization

No syncronization is needed when using MNEA repeater
connected to the signal interface unit.
2.6
Speed error correction

The gyrocompass generates a speed error. This is a precession
force that is causing a heading change either in westerly or
easterly direction depending on the course you are sailing.
To calculate this error, see the figure below.
Speed error (example 0.6) can be obtained at the point where
the speed error graduation line intersects with the line which is
extended from the ships speed (example 12 knots) across the
intersection of the line between the course (example 50) and
latitude (example 30) with the slanted solid line.
Accordingly, the true bearing is 50-0.6=49.4. (See note)
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Operation
28
90 - 90 - 270 - 270
80 - 100 - 260 - 280
70 - 110 - 250 - 290
60 - 120 - 240 - 300
50 - 130 - 230 - 310
30
40 - 140 - 220 - 320
0 - 180 - 190 - 0
10 - 170 - 190 - 350
20 - 160 - 200 - 340
30 - 150 - 210 - 330
Ship's heading (degrees)

( )
(+)
(+)
( )
0
0.2
26
0.4
24
0.6
22
0.8
Ship's speed (knots)
1.2
18
1.4
16
1.6
14
Speed error (degrees)
1.0
20
1.8
2.0
12
2.2
10
2.4
8
2.6
2.8
3.0
4
3.2
2
3.4
3.6
0
90
80
70
60
50
40
30
20 10 0
3.8
Latitude (degrees)
Note!
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When the course is 270~0~90, the true heading is the value

of the compass heading from which the speed error is
subtracted.
When the course is 90~180~270, the true heading is the
value of the compass heading to which the speed error is added.
THIS PAGE INTENTIONALLY

LEFT BLANK
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Technical specifications
3 TECHNICAL SPECIFICATIONS
Master compass Height:..................................................................... 253 mm
Width:...................................................................... 228 mm
Depth: ...................................................................... 228 mm
Weight: ...................................................................... 11,0kg
Inverter unit Height:..................................................................... 142 mm
Width:...................................................................... 228 mm
Depth: ...................................... 321 mm (with junction box)
Weight: ....................................................................... 8,0 kg
Output:...........................................................110V AC 5V
............................................................. 400 Hz +0/4 (8-10)
Power source Input: ............................................................ 24V DC 20%
At starting:........................................................ 5.0A
In normal operation: ......................................... 2.0A
Damping Frequency:...................................... 72.47' (at latitude 35)
Damping factor:.................................. 30 7% (at latit. 35)
Gimbals freedom 45
Temperature range 20C to +50C
Settling point error: .......................................... 1.8 sec. lat.
Variation error (1o): ......................................... 1.2 sec. lat.
Settling time: ............................................................ 4 hours
Follow-up rate: ............................................... Max. 36/sec.
Speed error: ....................................... refer figure on page 5
Latitude error:.................................. refer figure on page 30
Dynamic/Environmental
Performance Horizontal acceleration (0.1G)......................... 1.8 sec. lat.
Angular motion:
Rolling angle: ........25, period 7 to 12 sec.
1.8 sec. lat. Pitch angle: ............15, period 6 to 10 sec.
Yaw angle: ...............5, period 9 to 13 sec.
Vibration (4 to 40Hz, 2 hours later) ..............................2.0
Humidity (50C, 95% RH, 20 hours later) .......................1
Power fluctuation (Voltage +30%/-20%) .........................1
Power interruption (3 to 30 sec.).......................................1
Allowable latitude limit ..................................................70
Timer Set time range.................................................. 4 to 24 hours
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LEFT BLANK
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Assembly and installation
4 ASSEMBLY AND INSTALLATION

4.1
Preparation for installation

Warnings
Electrical warnings
The RGC50 is designed to be connected to 24 VDC power
sources only.
If 24V DC is not available on the vessel, it will be necessary to
obtain an external voltage converter/inverter unit. Refer to the
RGC50 specifications for details on the external voltage
converter/inverter requirements.
Transportation warnings
The RGC50 must not be moved or transported without being
properly protected. The sensitive element is packed in a carton
box, and the final assembly must be done onboard the vessel.
Never transport the RGC50 with the sensitive element
assembled.
For shipment in connection with service or overhaul, use the
original packing.
Unpacking a new unit

The RGC50 is shipped with the sensitive element packed in a
box separate from the master compass unit to protect the internal
sensitive element from damage during shipment. It is required
that the installing dealer perform the final assembly in
accordance with procedure described in RGC50 Assembly
instructions page 10, to install the internal sensitive element
prior to operating the RGC50.
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Standard equipment supplied

A basic RGC50 is shipped with the following items:
RGC50 Master Compass unit (includes Master compass and

Inverter unit)
Sensitive element (packed in a carton box)

Spares kit (contains optional mounting bracket, spare fuses,
spare bulbs)
Shade plate
RGC50 Instruction manual

RGC50 Assembly instructions
After unpacking the RGC50, the following procedure must be
performed to complete the assembly of the RGC50 gyro.
Note!
The assembly of the RGC50 is a delicate procedure, but it is not

difficult if you follow the detailed instructions on the following
pages.
Perform this procedure in a location that is clean and dry. It is
recommended that you have a small container tray available to
place some of the small hardware that will be temporarily
removed during this procedure.
The following tools will be required for this assembly
procedure:
small Phillips head screw driver
a pair of small pliers
a large straight blade screw driver
10
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Assembling
Note!
1.
Prepare a clean, dry and brightly lit area.
2.
Remove RGC50 master compass from the cardboard

packing box.
3.
Place the Master compass on the bench in front of you so

that control panel faces toward you.
4.
Set the Sensitive element in it's styrol packing container in

a safe location on the bench. Do not remove the sensitive
element from the carton box yet!
5.
Remove the 4 screws that attach the RGC50 Master

compass top cover to the support rods, and save screws for
reassembly.
6.
Carefully lift the cover and set aside for later re-assembly.
The cover is made up of two pieces, which are easily dropped if

not handled carefully.
7.
Study the following diagram to identify the items that will

be referenced in the next steps:
North Horizontal
Axis
Bearing Housing
North
North
Horizontal
Axis
Pin
Phantom Ring
Vertical
Ring
South
South Horizontal
Axis
Bearing Housing
Horizontal
Ring
Sensitive Element (mounted inside Vertical
Ring and Horizontal Ring)
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11
8.
Orient the Phantom ring so that the North part of the ring
is to your left side. North is identified as follows:
North indicated on compass card ring
Larger diameter Horizontal axis bearing housing
No wires or PCB attached to the phantom ring on the
North side
WARNING!
9.
Remove the retaining screws that secure the bearing

housing for the North side horizontal axis bearing housing
on the phantom ring. Set the screws aside for re-assembly.
10.
Carefully press out the North horizontal axis bearing

housing using only your fingers to remove the housing.
DO NOT USE any tools and be careful not to scratch the
outer surfaces of the bearing housing after it is removed,
otherwise you may have difficulty re-installing the
housing later in the assembly process. If there are any
shim washers used between the bearing and the phantom
ring, retain the shim washers for re-assembly.
11.
Remove the retaining screws that secure the bearing

housings for the South side horizontal axis bearing
housing on the phantom ring. Set the screws aside for
re-assembly.
12.
Carefully press out the South horizontal axis bearing

housing using only your fingers to remove the housing.
DO NOT USE any tools and be careful not to scratch the
outer surfaces of the bearing housing after it is removed,
otherwise you may have difficulty reinstalling the housing
later in the assembly process.
13.
Rotate the phantom ring until 270 on the compass card is

pointing towards the control panel.
Use extreme caution when handling the Sensitive

element! Only lift by holding on each side on top of
the vertical ring.
14.
Note!
Remove the Sensitive element from the carton box. Note

that the bottom of the sensitive element is the only one of
the six edges that has a flat surface.
Store the carton box for later shipment of element for future
overhaul.
15.
Remove the two tie wraps securing the Horizontal ring. Be

sure that the correct tie wraps are removed.
Do not turn the sensitive element upside down.
12
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Do not touch the shims that are marked with tape at this
time. These shims will be removed only after the RGC50
is installed on the vessel and must be available any time
the RGC is transported!
16.
Remove the two mounting screws from the South

horizontal axis, and set aside for later re-assembly.
17.
Carefully remove the South horizontal axis from the

sensitive element, and place the axis on a clean surface.
The South horizontal axis has a light coating of lubricant
on it. This is normal. Do not wipe the lubricant off this
axis. It is required for easy re-assembly.
18.
Rotate the sensitive element so that the North side

(marked by a large N on the lower face of the sensitive
element) is facing in the same direction as the compass
card. This should put the five green flexible wires to your
right and facing towards you.
270
WIRE
CONNECTION
TILTING
VERTICAL RING
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19.
Lift the sensitive element by holding on the east and west

side of the horizontal ring.
20.
Tilt the vertical ring as long as possible to one of the sides,

and insert the north horizontal axis pin into the opening of
the north side of the phantom ring. Then insert the south
part of the horizontal ring into the phantom ring, and allow
the element to rest on the base of the phantom ring.
21.
Verify that the five green flexible wires are located

directly next to the vertical terminal strip that is attached
to the South side of the phantom ring. (If it is not, then you
have installed the sensitive element backwards! Refer to
13
steps 18, 19 and 20 to correctly orient the sensitive

element.)
14
22.
Reinstall the South side horizontal axis pin carefully into

the horizontal ring.
23.
Locate the North Horizontal axis bearing (removed in step

10). The North horizontal bearing is the larger of the two
bearings. It will be inserted in step 26. Place the bearing
on the table surface near the North side of the gyro, within
easy reach during the next assembly steps.
24.
Locate the South horizontal axis bearing. (The smaller of

the two bearings.) Place in on the table surface near the
South side of the gyro, within easy reach during the next
assembly steps.
25.
With your left hand, carefully grasp the sensitive element

at the east side of the Horizontal ring, and lift it slightly
(approximately 5mm).
26.
With your right hand, carefully insert the North Horizontal

axis bearing into the opening in the phantom ring with the
screw holes in the axis bearing oriented vertically. (This
will also insure that the slot will clear the Allen screw that
is installed into the horizontal axis pin). Slide the bearing
into the opening while simultaneously inserting the
horizontal axis pin into the axis bearing. When the bearing
is seated fully into the phantom ring, the axis pin should
also be inserted fully into the bearing. Carefully transfer
hands so that your left hand is supporting the sensitive
element.
27.
Using your right hand, insert the South horizontal axis

bearing into the phantom ring opening. Carefully position
the sensitive element so the south horizontal pin is inserted
into the axis bearing, as you press the axis bearing into the
phantom ring opening. It may be necessary to slide the
sensitive element assembly over towards the South axis in
order to seat the axis into the axis bearing. Be careful to
align the screw holes for the axis bearing with the screw
holes in the phantom ring.
28.
At this point, the sensitive element should pivot freely in

both axis directions. If your feel any binding, it means that
one of the bearings is not installed correctly, or the axis
pins are not seated into the axis bearings. If necessary,
repeat step 26 and 27 until the sensitive element pivots in
both axis directions without any binding.
29.
Rotate the North horizontal axis bearing until the screw

holes are aligned with the screw holes in the phantom ring.
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30.
Reinsert the retaining screws in North axis bearing and

tighten screws securely. It may be necessary to rotate the
bearing slightly to get both screws to tighten without
sticking.
31.
Reinsert the retaining screws in the South axis bearing,

and tighten the screws securely. It may be necessary to
rotate the bearing slightly to get both screws to tighten
without sticking.
32.
Verify that the sensitive element is free to pivot in both

axis directions.
RED
White
Blue
Green
Orange
Figure 4-1 Flexible wire placement
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33.
Carefully insert the correct wires into the appropriate color

terminals as shown in Figure 4-1. Note that it may be
necessary to use a small pliers to grab the white plastic
part of the flexible wire connector for inserting the pin
into the receptacle. (Be careful not to mix up the white and
the orange color bands!)
34.
At this point, all the screws should be back in place except

for the 4 large flat head screws used to secure the cover on
the RGC50 compass.
35.
Carefully rotate the compass card slowly by hand through

at least one complete rotation, and verify that the entire
phantom ring will rotate without making any contact with
15
any of the mechanical or electrical components of the

RG50 binnacle assembly. Be especially aware of the PCB
that is supported on the South side of the phantom ring.
Also, verify that the 2 white wires that is connected to the
white compass card ring are routed in a way that they will
not get caught on any part of the binnacle, especially the
pointer support bracket.
Install the RGC50 in accordance with section 4.2.
4.2
Mechanical mounting
Recommended mounting locations
The following criteria should be taken into account when
mounting an RGC50 gyro:
The best location for a gyrocompass is at the center of the
ship's roll and pitch axis.
Given two locations, the one closer to the water line is the
better location.
Mounting a gyrocompass up on a fly bridge is not the best
location, and may cause the gyro to "tumble" during operation
(requiring the gyro to re-settle). It may even result in damage to
the sensitive element in extremely rough sea conditions.
Refer recommended mounting locations shown in the figures
below.
Different types of heading repeaters (Simrad Digital repeaters

and Analog repeaters, all running from NMEA signal) are
available to display heading information in remote locations.
Since the RGC50 is used as both a heading sensor and a heading
display, it is recommended that a location is selected that will
provide the most accurate heading information, and provide the
least amount of movement, vibration, or shock to the RGC50.
Note!
16
The RGC50 may be placed near magnetic objects without

concern, since the RGC50 is not affected by magnetic forces like
traditional magnetic or fluxgate compasses.
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Precautions
The following precautions must be observed when selecting a
mounting location for the RGC50 Master compass unit:
Ambient operating temperature where the Master compass
is located must be between 20C and +50C. This means
that the RGC50 master compass must not be installed in
an engine room!
The Master compass unit must be mounted on a flat
horizontal surface
The Master compass unit must not be mounted on an
angle.
The housing of the gyrocompass is not weather proof. The
Master compass must not be mounted in a location that is
exposed to the weather.
RGC50 Mounting Orientation and placement
The RGC50 must be mounted on a flat surface.
Provide ample space around the RGC50 for servicing.
Note that the wiring panel is accessed from the back of the
RGC50, so leave sufficient space behind the RGC50 to access
the wiring panel.
Note!
4.3
The Reference line on the binnacle of the master compass must

be aligned with the fore - aft centerline of the vessel. If the
RGC50 is mounted off the centerline, the heading readout will
be inaccurate, and you will need to re-position the RGC50
master compass during the test phase of the RGC50 checkout.
Running test
Connect 24 VDC input power lines on the terminal board
attached to the Inverter unit. This board will be found after
removing the protective cover. Refer to page 94: Main terminal
connection. Connect +24V DC to D+ and D. Note that this
terminal board has two sides and D+ and D are normally
located on the underside when the cover is closed.
Apply power and check for power lamp operation. Check the
voltage and frequency between terminals R1 and R2 of the
terminal board attached to the Inverter unit. Adjust them with
R75 (voltage) and R8 (frequency) of the Inverter board, if
necessary. (110V AC 3V 400Hz 2Hz).
Check the follow-up motion and the settling condition of the
Master compass (including the location of the level).
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17
4.4
Checking and correction of errors

When the compass has settled (normally 4 hours), check the
settled heading by a sun azimuth or the known bearing of an
object, or the dock heading.
Correct the error by turning the binnacle of the master compass
(if mounted separately) or by turning the Inverter base if
mounted together.
Large errors will require service adjustment by qualified service
technicians. The suspension twist wire on the sensitive element
needs to be adjusted. Refer Figure 6-2 Azimuth adjustment.
Reinstall the Master compass cover.
4.5
18
Checking the timer

1.
Turn outer knob to match the present time with the

reference line.
2.
Turn inner knob to match its reference line with the ETD
(estimated time of departure).
3.
Set the Master Switch to "TIMER". The timer setting

indicator lamp (red) lights.
4.
Three hours before departure time the gyro starts running

automatically. The running indicator lamp (green) lights.
5.
Within three hours, set the Master Switch to "RUN", the

gyro continues to run under the settled condition and the
timer setting indicator lamp (red) goes out. If the Master
Switch is not set to RUN position the RGC50 will be
shut down 3 hours after the set ETD.
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4.6
General information about RGC50 signal

output and connected equipment
The RGC50 master compass provides a single 1:1 synchro
electrical output signal intended to provide heading information to
external equipment. The optional signal interface unit converts the
1:1 synchro heading information into signal formats recognized
by a variety of other equipment. A typical installation of an
RGC50 may include connection of the RGC50 and signal
interface unit to an autopilot, Radar, a digital repeater, and an
analog steering repeater. The "intelligent" capabilities of the
signal interface unit also provide a capability to use an alternate
heading sensor to supply heading information to all of the
connected equipment, in the event of a gyro failure.
Note!
For connection to external equipment, refer to the relevant

instruction manual for the signal interface unit.
AUTOPILOT
GYRO
REPEATER
24V DC MAINS
NMEA or Step
RGC50
Syncro signal
SIGNAL
INTERFACE
UNIT
NMEA
FURUNO / ANRITSU
RADAR
NMEA or Step
ECDIS
Figure 4-2 Typical installation
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19

LEFT BLANK
20
20220356 / D
Principle of operation
5 PRINCIPLE OF OPERATION
5.1
Master Compass
The Master compass is made up of a gyro rotor located at the
center, vertical axes, a suspension wire and a vertical ring which
holds the gyro rotor vertically by means of ball bearings. On the
outside of these, there are horizontal axes and horizontal ring
which supports the gyro rotor horizontally with ball bearings.
The outermost component is a phantom ring, which is attached
to the binnacle of the Master compass. The Compass card is
attached to the upper part of the phantom ring and can be seen
through the glass from above the case.
The other components are:
a liquid ballistic, which gives a north seeking action to the
gyro
a damping weight as a damping device
a follow-up transformer which detects azimuthal changes
a servo amplifier which amplifies electrical signals from
the follow-up transformer and a servo motor which rotates
the card in response to the output from the servo amplifier.
As stated above, the Master compass consists of the gyro section
with freedom of three axes, the north-seeking and damping
section and the follow-up section.
These sections are arranged on the binnacle via springs to
damper vibrations and shocks.
Sensitive element
The Sensitive element consists of the gyro rotor, damping
weight, vertical ring, suspension wire, level, follow up
transformer, liquid ballistic and horizontal ring.
Gyro rotor and Damping weight
The gyro rotor is the cardinal component of the gyrocompass in
which the 81 mm dia. 41 mm thick rotor rotates at a
synchronous speed of 12,000 rpm. The gyro rotor is driven
about 120 out of phase with the output (110V AC, 400 Hz, 3phase, square wave) from the Inverter unit. It rotates clockwise
as seen from the north side (stamped N.) The rotating gyro rotor
should be checked for vibrations or sound that occur at the
initial stage of starting. The rotating direction can be checked by
looking into the glass window on the north side.
20220356 / D
21
A damping weight is mounted on the west side (in the direction,

the case is taken out) of the gyro rotor. The damping weight
applies a torque to rotate the vertical axis in proportion to the
inclination of the gyro spin axis. This torque causes the gyro to
make a damping motion and to stay pointing to the north.
Vertical Ring, Suspension wire and Level
The gyro rotor is suspended by a suspension wire from the top
of the vertical ring and is supported horizontally with ultra high
precision bearings at the top and bottom of the vertical ring.
These bearings serve only as guide bearings. Special care must
be taken in handling the bearings. If even a small amount of dust
enters, friction between the bearings and axes will increase and
result in errors. Although the gyro rotor is structured for dust not
to enter, it should be handled carefully. Definitely avoid
touching it or blowing smoke on it.
The suspension wire consists of 6 stainless steel wires that are
completely free of torsion. If torsion remains, the torsional
torque of the wire acts on the vertical axis to cause errors. In
order to completely eliminate torsional torque, the suspension
wire can be adjusted minutely with the tangent screw at the top
of the vertical ring. Regarding the relation between the rotation
of the screw and the azimuth, see the relevant figure in chapter
6, ADJUSTMENT.
Vertical
direction
Torque for rotation of
the vertical axis
A precise level is provided on the east side of the vertical ring

and it indicates the inclination of the gyro spin axis. It is
graduated in units of minutes (angle) and is used for balance
adjustment described in detail in Chapter 6 Adjustment.
22
20220356 / D
Principle of operation
Follow up transformer
Primary and secondary follow up transformers are provided on
the south side of the frame attached to the gyro rotor and vertical
ring. The gyro rotor points to one point in the space by the
characteristics of the gyro. The vertical ring performs the same
motion with the hull via the horizontal and phantom rings. If the
positional relation of the gyro rotor and vertical ring changes
due to the change in the ship's course or the rotation of the earth,
this causes a change in the follow up transformer, thereby
inducing a voltage in the secondary coil. This voltage operates
the servo amplifier and the servo motor to rotate the phantom
ring, thus bringing the two follow up transformers back to the
correct positional relation as before zero electric output. This
causes the correct azimuth to be followed and is indicated
through the compass card.
By dividing with a capacitor, an exciting voltage of 110V AC
400Hz single phases is supplied to the primary follow up
transformer.
0.22uF
AC110V 400Hz 1
2.2uF
Primary side
To the servo amplifier

Secondary side
Liquid ballistic
The liquid ballistic consists of a plastic container attached from
the north to south of the frame of the vertical ring, a connecting
pipe and a special liquid (Galden HS) with a large specific
gravity.
The liquid ballistic applies a torque proportional to the
inclination of the gyro spin axis to the horizontal axis. This is
done by utilizing the amount of liquid not balanced in the liquid
ballistic, which is caused by the inclination of the gyro spin axis
(rotor driving axis). This torque gives rise to the north seeking
action which causes precession to make the gyro point to the
north.
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23
Horizontal ring
With the help of ultra high precision bearings, the horizontal
ring holds the vertical ring and gives the east west freedom to
rotate.
Special care must also be taken in handling these bearings. Play,
if there is any, in the bearings produces a change in the center of
gravity of the gyro, causing an error in the azimuth. Even minute
dust particles will increase friction in the bearings, causing an
irregular torque of the horizontal axis rotation, which finally
causes an error in the azimuth.
Follow-Up mechanism
The follow-up mechanism consists of the phantom ring, servo
amplifier, servo motor and gear mechanism.
Phantom ring, Servo motor and Gear
mechanism
The phantom ring, which holds the horizontal ring with
bearings, gives the north south axis freedom of rotation. The
bearing on the south side is provided with a damping function
for oscillation, such as rolling. A 100,000CS (viscosity) silicon
oil of 0.7 cc is contained for the damping function. The 202 mm
diameter compass card and an illumination plate are on top of
the phantom ring to light up the whole card with four electric
bulbs.
An illumination controller is mounted to the right of the switch
panel of the power unit. The azimuth gear at the bottom of the
phantom ring engages with the gear mechanism of the servo
motor, driven by the output of the servo amplifier, thus forming
the follow up servo mechanism, which is unified with the
support by means of the bearings at the bottom of the phantom
ring.
5.2
Inverter unit
The inverter unit consists of a switch panel and an Inverter
board. The start switch, time setter, indicator lamps, a fuse, and
illumination controller of the master compass are arranged on
the switch panel.
Operations are performed entirely on the surface. PCB is
incorporated and can be replaced by disconnecting the
connector. Its consist of timer, inverter and 1 ~ 3 phase
converter circuit. A filter to eliminate noise is built in the
Inverter unit.
24
20220356 / D
Adjustment
6 ADJUSTMENT
6.1
Master compass
Adjusting the torsion of the suspension
wire
1.
Remove the square damping weights on the west side of

the rotor case. Attach the round weights and put back the
nuts and washers.
2.
Mount a level on the level mounting base of the horizontal

ring.
3.
Apply a wood block between the bottom of the sensitive

element and the phantom ring and adjust it so that air
bubbles in the levels of the horizontal and vertical rings
come to the middle.
4.
Turn the rotor case to the left and right until it reaches the
stoppers and leave it as it is. If there is no torsion in the
suspension wire, the marked-off lines of the rotor case and
vertical ring agree with each other. If there is a large
torsion, loosen the two flat head screws on the suspension
wire and turn the support fitting on the suspension wire to
make the marked-off line coincident. Then, tighten the flat
head screws and minutely adjust the marked-off lines with
the tangent screw. After tightening, check again.
Balance adjustment
Vertical balance (east-west direction)
1.
Manually hold the bottom of the sensitive element and

bring the air bubbles to the middle of the horizontal ring
level and rotor case.
2.
Bring the marked-off line of the rotor case to be roughly

coincident with that of the vertical ring
3.
Tilt the vertical ring toward the south side. At this time,
the marked-off lines of the rotor case and the vertical ring
must remain coincident.
a.
20220356 / D
If the west side is heavy (the marked-off line of the rotor

case gets displaced to the right), reduce the adjusting
weights (round) on the west side of the rotor case by
equal amounts. Or add two equal weights to the adjusting
weights (round) on the east side.
25
b.
If the east side is heavy (the marked off line of the rotor
case gets displaced to the left), perform the reverse of a).
General balance
1.
Mount the damping weight.
2.
Bring the air bubble of the level mounted on the horizontal

ring to the middle.
If it is not in the middle, add or remove weights to or from
the horizontal ring to bring the air bubble to the middle.
Push down the west side of the horizontal ring, then push
down the east side and the air bubble must be at 30
minutes or less. Adjust it by applying liners to the
horizontal ring and ball bearing housing.
3.
Two to three hours after the operation, repeat step 2.
4.
Remove the level.
Checking position of the pick-up transformer
26
1.
Put the master compass on the meridian after operating for

30 minutes; match the gyro compass azimuth with the
meridian. (The damping weight must be mounted.).
2.
Check if the rotor case and vertical ring are aligned by

looking at the on-line marks. If they are not, adjust by
moving the pickup on the secondary side.
3.
Set the center of the air bubble of the level to 50'; let it
stand and watch changes in the azimuth and the position
of the air bubble. Five minutes later the azimuth should be
within 0.3 and the level within 2'.
a.
To adjust the heading indication, add an equal amount of

weights to the left and right on the south or north side on
the liquid ballistic frame. When weights are added to the
south side, the heading indication increases (westerly
error). When weights are added to the north side, the
heading indication decreases (easterly error). For the
corrective amounts, see Figure 6-1.
b.
To adjust the level, use the tangent screw of the

suspension wire. For the direction and corrective
amount, see Figure 6-2.
20220356 / D
Adjustment
Heading adjustment procedure

Heading error less than 2 degrees
When the gyro is settled (after approx. 4 hours) and the heading
error is less than 2 degrees, loosen the master compass fixing
bolts and turn the gyro to correct the error.
Heading error greater than 2 degrees
Provided that the gyro is settled and functioning correctly, the
heading error should not be more than appr. 5 degrees.
Correction is made as follows: Observe the compass card from
above and orient your mind such that the lubber line, fine adj.
screws and suspension twist wire shaft is lined up as shown.
When the heading is too high, imagine that the lubber line has to
be moved CCW to show the correct lower heading. Hence the
adjustment is made by turning the fine adjustment screws such
that the suspension twist arm moves in the same direction
(CCW). Turn the left fine adjustment screw CCW (out) and
tighten (CW) the right adjustment screw.
Lubber line
Fine adjust
screws
Suspension
twist arm
Suspension
twist wire shaft
Compass card
20220356 / D
Be aware of that one

turn of the fine
adjustment screw
may give as much as
10 degrees course
change.
When doing the
adjustment, the
element will be
displaced and has to
align again. This
takes some time,
depending on the
displacement (1-3
hours).
27
Figure 6-1 Level adjustment
Figure 6-2 Azimuth adjustment
28
20220356 / D
Adjustment
Damping adjustment
1.
Make sure that the master compass becomes still.
2.
Let the heading indication be 30 (westerly error) from the

settling point. After raising the level air bubble about 10',
leave it standing and measure changes in the heading
indication as time goes by.
3.
Obtain the damping factor and cycle by the following

formula.
Damping factor:
F1=b/a x 100
F2= c/b x 100
F1 + F 2
Fa=
2
Reference value:
a
c
b
Fa= 25 to 35%
T = 65 to 80 min. (for high latitude)
80 to 95 min. (for low latitudes)
4.
The damping adjustment is done by increasing or

decreasing the damping weights. For the damping weights,
see Figure 6-3.
Figure 6-3 Damping ratio adjustment
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29
Figure 6-4 Latitude Error Curve
Servo amplifier
1.
Ascertain that the Master Compass almost settles at the

specified voltage and current.
2.
Fully turn resistor VR1 in the servo amplifier clockwise.
3.
Forcibly rotate by hand a little the gears of the servo motor

gear train which is engaged with the azimuth gear.
4.
The Master Compass is likely to hunt. If it hunts, stop it

by turning VR1 counter clockwise. Set VR1 to a value
smaller than the resistance value at which hunting is
stopped.
Make sure that hunting does not occur.
30
20220356 / D
Adjustment
6.2
Inverter board
Voltage adjustment
1.
Set the main switch on the control panel to RUN position.
2.
Wait at least 3 minutes after the light in DS1 is turned off.

Measure the voltage level at the output taps (0-110V) of
the transformer. The value shall be 110V3V rms. Use a
true RMS multimeter.
3.
Adjust the value with R75 if required.
Frequency adjustment
20220356 / D
1.
Set the main switch on the control panel to RUN position.
2.
Wait at least 3 minutes after the light in DS1 is turned off.

Measure the frequency at the output taps (0-110V) of the
transformer. The value shall be 4002Hz.
3.
Adjust the frequency with R8 if required.
31

LEFT BLANK
32
20220356 / D
Maintenance
7 MAINTENANCE
Gyrocompass seldom requires checks and maintenance. Inform
the crew of the following items:
1.
Do not touch any part of the Case unnecessarily.
2.
If there is any trouble, stop the Gyrocompass and notify

the service station of the noise, abnormal rotation of the
compass card, compass error, etc.
Main Bearing List

Place of use
Rotor
Part No.
44177418
(102216991)
Brand
Lubrication oil
Special design
bearing
Oil: DTE oil light.
NSK
Oil: DTE oil light

mixed with TCP
liquid
6 x 19 x 6
Ver. & Hor.
axes
44137495
(10210326)
6 x 19 x 6
Same as ES-11A
Special design
bearing
Follow-up axis
(north side)
(102201370)
28 x 38 x 5
Origin CR2838 (open type)
Follow-up axis
(west side)
(007206061)
6 x 17 x 6
JIS medium
class (both
shield type)
Filling amount:
4cc/pc
Silicon oil KF96

(100,000cs)
Main Parts List

Part name
20220356 / D
Part No.
Quantity
Remarks
Flexible wire
(vertical)
44137545
(102295800)
3 pcs
Flexible wire
(horizontal)
44137552
(102295970)
5 pcs
Liquid for
ballistic
44138360
4.6cc
GALDEN HS
Liquid for
damper
44138378
0.7cc
Viscosity:
100,000cs
Silicon Oil KF96
0.03/5 pcs.
(straight) l = 25mm
0.03/5 pcs.
(straight)
33
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34
20220356 / D
Overhauling
8 OVERHAULING
8.1
Precautions
The Master Compass should be overhauled in a clean room or
on a clean bench. If not available, disassemble, clean, lubricate
and assemble the compass in a clean place with no ventilation
taking care not to expose it to dust.
Do not use grease and oil stocked for more than a year.
Use white gasoline for cleaning. (Alcohol or benzine is not
desirable because of the powdering.)
Use filtered dry air for cleaning. When the bearing is air blasted,
do not turn the bearing. Never touch the cleaned bearing with
hand directly.
A service kit is available (part no. 13108196). This kit includes
special tools/oil and adjustment weights.
8.2
Special tools/units for adjustment

Special tools
1.
Assembling jig for upper portion of the vertical axis (Jig

A). Part no. 27103142.
59.0 mm
24.0 mm
6.0 mm 7.9 mm
3.1 mm
20.0 mm
20220356 / D
35.9 mm
35
2.
Assembling jig for lower portion of the vertical axis (Jig

B). Part no. 27103159.
25.0 mm
24.0 mm
8.0 mm
12.0 mm
4.0 mm
6.0 mm
15.0 mm
3.
Jig for removing the vertical flexible ass'y (suspension

wire section) (Jig C).
21.5 mm
Connector plug
11.0 mm
P/N 100386550 x 2 pcs

P/N 100386560 x 4 pcs
4.
Retainer remover (two kinds for expanding and

narrowing).
5.
Gap gauge made of bakelite or acrylic plate (for

measurement of 2 mm thick).
6.
Metal fitting for rotor suspension (for measurement of

rotor swinging).
7.
Connector assembly for rotor.

Connector housing P/N 100386550 = 1 pc
Receptacle
36
P/N 100386560 = 5 pcs
20220356 / D
Overhauling
8.3
Disassembly
Sensitive Element
Removing sensitive element
20220356 / D
8.
Insert the wood or rubber block (5.5mm thick) between

the vertical ring lower portion and phantom ring to fix the
sensitive element.
9.
Pull out five flexible wire pins on the south side of the
phantom ring from the connector.
10.
Remove the mounting screws of the housing case on the

north and south side of the phantom ring and pull the
housing case out. At this time, pay attention on the
number of clearance adjusting shim.
11.
Remove the mounting screws of the horizontal ring north

and south gimbal axes, and pull the axes out.
12.
Take out the sensitive element from the master compass

while keeping the element horizontal.
37
Cleaning and lubricating method for the

gimbal ring bearing
38
1.
North-side bearing
This bearing is united with the damper housing. After
cleaning, fill the bearing with 0.7cc of the damper oil (KF96, 100,000CS).
The damper is effective if the sensitive element stops after
five times swinging or so when it is assembled and swung.
2.
South-side bearing
Remove the retainer and pull the bearing out. This bearing
is of shield type and replace with new one when wrong
friction condition.
20220356 / D
Overhauling
Disassembling horizontal ring
20220356 / D
3.
Remove the acryl cover of the west side flexible wire.
4.
Carefully pull out five flexible wire pin on the horizontal

ring from the connector.
5.
Remove one of the mounting screws of the flexible wire

support fitting and fix it aslant with another screw. Then
remove two lead wires (orange/green) connected to the
liquid ballistic, from the back side.
6.
Remove the round lock nut of the east-side horizontal

axis.
7.
Remove the mounting screws of the east and west side

bearing housings and pull them out.
8.
Remove the mounting screws of the east side

horizontal axis and pull it out. (Remain the west
side axis.)
9.
Pull the horizontal ring out while keeping the

vertical ring aslant.
39
Disassembling liquid ballistic
1.
Take out the air tube of the liquid ballistic from the liquid
ballistic container.
2.
Loosen the screws of the liquid ballistic frame on the east

and west sides and take the liquid ballistic out downward
together with the mounting block. Care should be taken
not to damage the follow up coil in such a way as covering
it with a vinyl pouch.
3.
Do not remove the liquid ballistic container, the pipe and

the follow up coil from the mounting block.
When these positions are moved, the time has to be wasted
for the cross alignment adjustment.
4.
The liquid of the ballistic is Galden HS, and 4.6cc is used.
5.
Clean the inside of the liquid ballistic pipe with air below
and not to wash with benzine, etc.
(The liquid does not need to be exchanged when the flow

condition, the volume and the color are normal.)
Disassembling vertical ring
40
1.
Measure the clearance between the inner ring of the

vertical ring lower axis and the rotor. (0.35 mm ~ 0.4mm)
2.
Pull out both the upper and lower connectors on top of the
vertical ring.
3.
Remove the vertical flexible ass'y, and mount JIG C (refer

page 36) on the connector place.
20220356 / D
Overhauling
20220356 / D
4.
Remove the lower mounting screws of the flexible wire

mounting plate and then remove the L shape fitting.
Pay attention not to cut the flexible wire.
5.
Insert the shim about 0.6 mm thick to the clearance

between the rotor case lower side and the vertical rotor
case lower side and the vertical ring to give bending to the
suspension wire. This should protect the suspension wire
when removing it.
6.
Remove the mounting screws of the clamp disk plate on

the top of the suspension wire, and loosen the tangent
screw to remove the clamp disk and the adjustment arm.
7.
Remove the mounting screws at the bottom of the

suspension wire. Hold the rotor with one hand to avoid
twisting the suspension wire.
8.
Pull the top of the suspension wire with hand (pull it up

with fingers) to take out the suspension wire axis. Then
take out the suspension wire through the slot in the
vertical ring north side.
9.
Insert Jig A (refer page 35) for upper vertical axis.
10.
Remove the fitting plate. Length of the fitting plate

mounting screw is 10mm. Be sure to use the same screw
when reassembling.
11.
Bring the vertical ring down with its north side below, and
loosen the housing case mounting screws of the lower
bearing to take out the housing case. Pay attention at this
time on the numbers of the adjusting shim.
41
42
12.
Loosen the mounting screws of the vertical lower axis to

pull the axis out. Pay attention not to give damage on the
bearing fitting surface of the axis.
13.
Remove Jig A that was inserted in point 9.
14.
Take the rotor case out of the vertical ring from south side.
15.
Remove the fixing retainer of the upper bearing housing

on the vertical ring to remove the housing case.
20220356 / D
Overhauling
Cleaning and lubricating bearing of horizontal

and vertical axes
Horizontal bearing
1. Remove the housing cover mounting

screws to take the bearing out. Pay
attention on the numbers of the shim.
2. Clean the bearing according to the
precautions described in page 35.
Vertical bearing
1. Remove each retainer of the upper

and lower housings to take out the
collar and bearing.
2. Clean the bearings according to the
precautions described in page 35.
Lubrication for bearing
The bearing should be housed in the housing case with the side
of better rotation upward when the bearing is inserted to the
erected pincette upside down and turned slightly by hand.
Replace the bearing of poor rotation with a new one.
It is desirable to use the bearing of the best rotation for the
vertical axis.
The best lubrication for the horizontal and vertical bearings is as
follows:
Put 3-4 drops of DTE oil into the bearing and gently turn
the bearing.
20220356 / D
43
Disassembling rotor
44
1.
It is desirable to confirm the vibration state of the rotor

running before disassembling.
2.
With the north side up, loosen the cover mounting screws
to take the cover off. As there is a spring inside the cover,
do that while pushing the cover by hand.
3.
There are three kinds of the oil wick. Confirm their

condition and color changing. Reuse them after cleaning
with white gasoline and drying if the color changing and
wear conditions are normal.
20220356 / D
Overhauling
20220356 / D
4.
Take out the oil wicks taking care not to damage them and
pull the guide ring out.
5.
Remove the fixing screws of the north side bearing.
6.
With the south side up, loosen the cover mounting screws
to take off the cover.
7.
There are three kinds of oil wick. Confirm their condition

and color changing. Reuse them after cleaning with white
gasoline and drying if the color changing and wear
condition are normal.
8.
Take out the coil wicks taking care not to damage them,
and pull out the guide ring.
9.
Remove the bearing fixing screw. (Be careful this is a

right-hand screw.
10.
With the north side up, loosen the six fixing screws of the
north side case to remove the case. Be careful not to
damage the follow-up coil on the south side.
11.
Take the rotor out of the south side case.
12.
Remain the inner race of the rotor axis on the axis and
clean it with gauze, etc. Do not take it out, and apply a
drop of DTE oil if visual inspection finds no defect and
blur.
Be careful that when the inner race is removed, machining
the rotor for balance may become necessary.
Clean the outer ring and ball. Put 2 drops of oil after
reassembled the outer bearing into the bearing. Then
assemble them in the rotor after placing them on the tissue
paper for about three minutes.
45
13.
Take the bush and bearing out of the south and north side
cases.
14.
When replacing the rotor bearing with a new one, be

careful that the machining rotor for balance may become
necessary.
15.
Always replace the complete bearing consisting of both

the outer and inner ring.
Master Compass
1.
Remove the slip ring brushes to clean the slip ring surface
and the brush end surface. Use technical spirit to clean and
aply CRC-5-56 on the slip ring surface afterwards.
2.
Confirm the wear condition of the plate springs of the

shock absorber and their effectiveness. (When necessary,
replace them.)
3.
As for disassembling the follow up servomotor and its

assembly, and the syncro transmitter motor and its
assembly, refer to the exchanging interval in table 3.
Confirmation of the condition of the items within the

exchanging interval should be surely made too.
8.4
Assembling
Sensitive element
Assembling Rotor
1.
Install the bearings into the south and north side case with
the surface having a stamp on the outer race outward.
Tighten the fixing screws of the south and north side of
the inner bearing.
2.
Install the rotor into the south side case.
3.
Install the north side case and tighten the six mounting
screws. Ensure that you mount the case in the correct
direction.
The followings are common to the north and south without
the special notice.
46
4.
Install the bearing fixing bush (with the notch downward).
5.
Install the guide ring into the housing case (with the notch
outward and upward).
6.
Install the oil wicks (three kinds).
20220356 / D
Overhauling
Remove the powder on the new oil wicks by air blow.

Install the oil wicks carefully because the life of the rotor
bearing is affected by their installed condition.
a) Place the oil wick - 1 (P/N 102216090) with its tip at the
top.
110 mm
6 mm
t = 5 mm
b) Install the oil wick - 2 (P/N 102216090) so that its tip is

inserted to the notch of the guide ring and lie along the
axis. (Remember the condition when disassembling.)
110 mm
6 mm
t = 2 mm
c) Insert the oil wick - 3 (P/N 102216100) to the gap at the

bottom of the busk case.
11 mm
5 mm
t = 1 mm
d) Pour 4 cc of DTE oil light at the one side of the wick.

Pour the oil over the wick uniformly using an injector,
etc.
20220356 / D
7.
Install the south side cover.
8.
Place the spring in the north side and install the cover. Be
careful not to damage the follow-up coil on the south side.
47
Notes !
a) After assembling, make sure the rotor has a spring action

with swinging the rotor rather strongly in the direction of
north and south while keeping the rotor horizontal by hand.
b) Make sure the vibration of the rotor when the power is
supplied to the rotor only. (It is acceptable to have the same
order vibration as before disassembling.)
The vibration less than 0.5 micron is desirable at the top of
the N/S side rotor axis when measuring with the vibration
meter.
c) Stop the rotor with the opposite phase connection of the
power supply.
Assembling the vertical ring
48
1.
Install the housing case at the top of the vertical ring and
fix with the retainer.
2.
Place the rotor with the north side upward.
3.
Insert the vertical ring and fix the upper portion (Jig-A)
and the lower portion (Jig-B) using the vertical ring
assembling jigs.
4.
Mount the fixing plate for the rotor and the vertical ring.
(The mounting screws are two of 3 mm - 12mm length,
and one of 3 mm - 10 mm length.)
5.
Mount the balance weight on the north side of the rotor.
6.
Pull out the lower jig and mount the lower axis. Then
mount the housing case of the lower bearing. (Be careful
of the clearance adjusting shim.)
7.
Erect the vertical ring assembly.
8.
Pull out the upper jig and mount the suspension wire
assembly. Tighten the mounting screws of the suspension
wire while pushing the rotor slightly with hand.
Tightening the screws with pushing the vertical ring
strongly may cause damage of the suspension wire.
9.
Mount the clamp disk and the arm at the top of the
suspension and tighten the tangent screw slightly.
10.
Measure the clearance of the lower axis to be 0.35mm

(hardly) and 0.40 mm (softly). Be sure the rotor moves
slightly up and down with this clearance.
11.
Mount the flexible wire assembly of the suspension wire

section with (Jig C). Be careful not to damage the flexible
wire.
20220356 / D
Overhauling
12.
Arrange the flexible wire in a good shape. Arrange in

roundness as far as possible.
13.
Mount the upper and lower connector on top of the

vertical ring supporting the three 100V three phase. Be
careful not to damage the wire.
14.
Adjust the twist of the suspension wire. Align to the mark

line.
15.
Make sure the suspension wire swings about seven times

to and from.
16.
Adjust the north-south/east-west balance.
Assembling the liquid ballistic assembly
1.
Cover the pick up coil with a vinyl pouch. Bring the lead
wire outside through the gap between the balance weight
supporting pole and the projection of the liquid ballistic.
2.
Mount the liquid ballistic frame on the vertical ring so that

the frame center is set at the center of the vertical ring. Be
careful to not damage the coils.
3.
Insert a 2 mm thick gap gauge (made of bakelite or acrylic

plate) between the secondary and the primary coil. This to
ensure correct distance between the coils when tightening
the mounting screws on the liquid ballistic frame.
4.
Mount the upper air pipe of the liquid ballistic on the

liquid ballistic container. Pay attention to the O ring.
Assembling the horizontal ring
20220356 / D
1.
Insert the vertical ring into the horizontal ring while

keeping the vertical ring aslant and mount the east side
horizontal axis.
2.
Mount the east/west bearing housing cases.
3.
Tighten the locknut of the east side horizontal axis

(round). Make sure the clearance in the east-west direction
of the horizontal ring.
4.
Put the two lead wires from the liquid ballistic

(orange/green) on from back side of the connector.
5.
Mount the support plate of the flexible wire. The clearance

between the pin connector and the horizontal ring is about
1 mm.)
6.
Put the five flexible wire pins in the connector.
7.
Mount the west side acrylic cover.
49
Mounting sensitive element
8.5
1.
Place the rubber or wood block (6 mm thick) on the

phantom ring.
2.
Mount the sensitive element on the phantom ring while

keeping the sensitive element horizontal.
3.
Mount the south/north axes of the horizontal ring.
4.
Mount the south/north housing cases of the phantom ring

and make sure the clearance in the north-south direction.
(Pay attention to the clearance adjusting shim.)
5.
Put the flexible wires (five) in the south side connector of

the phantom ring.
6.
Remove the rubber or wood block.
Adjustment
1.
Make adjustment after 2 ~ 3 hours running.
2.
Adjust level of the horizontal ring within 2 minutes arc.
3.
Refer to:
Figure 6-1 page 28 for Level adjustment
Figure 6-2 page 28 for Azimuth adjustment
Figure 6-3 page 29 for Damping ratio adjustment
Adjustment of the pick up coil position for perpendicularity of

the gyro spinning axis/horizontal axis.
50
1.
Make sure the master compass is stopped.
2.
Give a large swing to the horizontal ring about 100 times

(to and from) by hand. Make sure not to touch the stopper.
20220356 / D
Overhauling
When the movement is more than five minutes observed on the

boble level, do as followes:
Note!
8.6
3.
When the N side of the spinning axis tilts up, loosen the
mounting screws of the 2ry pick up coil to move it in the
east direction by beating slightly with a screwdriver, and
tighten the screw.
4.
When the S side tilts up, move the 2ry coil in the west
direction.
5.
Perform the test again (2) to check the level movement.
Large aberration of the pick up coil to the above each axis may
cause error of the gyro when the ship is rolling.
Final confirmation
Necessary items should be recorded referring to the check sheet
in the separated table.
20220356 / D
51
8.7
CHECK SHEET FOR RGC50

Ship name
Owner
Service Engineer
Ser. No.
Rotor no.
Date of Service
Mechanical Inspection
Sensitive element
1.
Tightening all screws.
2.
Gap between phantom ring and horizontal ring (10/100)
3.
Gap between horizontal ring and horizontal ring axis (10'

~ 20')
4.
Gap of vertical ring lower axis (0.35 ~ 0.40 mm)
5.
Gap between follow up coils (2.0 0.2 mm)
6.
Free swinging of suspension wire (7 swings)
7.
Oil leakage from liquid ballistic
8.
Arrangement of harness/flexible lead wires.
9.
Soldering points.
Master compass
52
1.
Tightening all screws.
2.
Check shock absorber.
3.
Fixing of slip rings and brush.
4.
Engagement of transmitter gear and azimuth gear.
5.
Engagement of servomotor gear and azimuth gear.
6.
Fixing of connector, arrangement of harness.
7.
Soldering at transformer and phantom element.
8.
Damper oil leakage from phantom element.
20220356 / D
Overhauling
9.
Non contact between turning phantom ring and others

(clearance should be more than 2 mm.)
Phantom ring harness:
Rubber line mounting plate
Buffer amplifier:
Shock absorber/Power supply

line harness/Servomotor harness
Horizontal ring weight
mounting/Vertical ring upper
portion.
Horizontal ring flexible lead: Outside cover/Inside bearing

portion.
Horizontal ring inside:
Liquid ballistic pipe/Frame

weight mounting/Phantom
ring lower portion.
Vertical ring upper portion: Card lamp.
General inspection
Inverter Output (400 Hz)
8-10
AC 110V 5V
1.
Zero adjustment of 1X, 90X synchro.
2.
Lighting of card illumination.
3.
GAIN adjustment
4.
Perpendicularly test of pick up coil.
5.
Damping test
6.
Fa = 0.30 0.07
Fa =
T = 72.4' 7'
T =
Settling test
The meridian 2
50' 5
Swinging amplitude
P-P = 3 or less
* Perform the following when necessary.
7.
Repeatability
3 or less
8.
Swinging test
1
9.
Inclination
P-P = 3 or less
20220356 / D
53
10.
Turning
15
11.
Vibration
1.5
12.
Others
Damping weight (one side)
gr
Swinging weight (one side)
gr
Mounting of liquid ballistic weight

13.
Package
Protection of suspension wire (Insertion of shim at upper
and lower portion)
Fixing of rotor case (with sponges two positions)
Fixing of horizontal ring (with insular rocks two positions)
Fixing of vertical ring (rubber washer)
Fixing of phantom ring/vertical ring
Fixing of shock absorber (with packing four positions)
54
20220356 / D
Troubleshooting
9 TROUBLESHOOTING
It is essential that the operator fully understand the operations of
the gyrocompass so that he can find out such problems as
excessive noise, heat and vibration, as early as possible.
Troubleshooting charts:
20220356 / D
Chart 1
Green POWER light does not light.
Chart 2
Red TIMER indicator of power supply does not

light.
Chart 3
Defective master compass - Gyro rotor does not

rotate.
Chart 4
Defective master compass - Compass card rotates in

one direction only.
Chart 5
Defective master compass - Compass card hunts.
Chart 6
Defective master compass - Rotor case does not

stand up (or no synchronization).
Chart 7
Defective master compass - Excessive noise or

vibration from rotor case.
Chart 8
Improper voltage from the power supply.
Chart 9
Defective timer circuit.
Chart 10
Compass error.
55
Chart 1
Green POWER light
does not light.
Is OPERATION/STOP
switch ON?
No
Select ON
Yes
Is voltage between external

terminals D+ and D- of power
supply junction 24VDC +30% -20%
No
No
Inspect ship's
power supply.
Yes
Yes
Is fuse F1 blown?
Replace indicator CR15

or check related open
circuits.
Replace F1
Chart 2
Red TIMER indicator
of power supply does
not light
No
Select TIMER
Is OPERATION/STOP
switch at TIMER?
Yes

terminals D+ and D- of power
supply junction 24VDC +30% -20%
No
No
Inspect ship's
power supply.
No
Is TIMER lamp
defective?
Yes
Is fuse F1 blown?
Yes
Replace F1
Yes
Replace the
lamp.
Check timer
circuit.
Chart 3
Defective Master Compass Gyro Rotor does not rotate.
No
See Chart 1
Does green POWER indicator

of power supply light?
No
See Chart 8
56
Yes

terminals R1 and R2 of power
supply junction 110VAC3Vrms
Yes
Inspect the circuit

between power supply
and gyro compass.
20220356 / D
Troubleshooting
Chart 4
Defective Master Compass Compass Card rotates in one
direction only.
No
Yes
Is Gyro Rotor operations

normal?
See Chart 3
No
Rotate GAIN control RV1 (located in

servo amp) counterclockwise to
provide the lowest gain.
Did the Compass Card stop rotating?
Yes
No
Is voltage between TP1 and

TP2 (in servo amp PCB)
+15VDC?
Also, is voltage between
TP1 and TP3 -15VDC?
Replace
servo amp.
See Chart 6.
Yes
Chart 5
Defective Master Compass Compass Card hunts.
No
Is rotor voltage between

external terminals R1 and R2
of power supply junction
110VAC3Vrms.
See Chart 8
No
Problem
20220356 / D
Yes
Slowly rotate GAIN control VR1

(located in servo amp) counterclockwise.
Did the Compass Card stop hunting?
Remedy
Excessive hunting may occur

due to the short-circuited
follow-up transformer.
Call for service
When the ship turns, hunting

may occur due to improper
contact of slip ring of master
compass.
Polish the slip ring.
57
Chart 6
Defective Master Compass Rotor Case does not stand up
(No synchronization).
No
See Chart 3
No
Improper wiring inside

the rotor case.
No
Replace the defective

coil.
Does rotor rotate?
No
Is voltage between
rotor case terminals
A and B (located at
the slip ring assy)
approx. 9VAC?
Yes
Is resistance as
below?
Approx. 140 ohm for
primary, approx160
ohm for secondary.
Yes
Rotate VR1 (located in the Servo amp)

CCW and set primary and secondary
circuits of follow-up transformer to their
maximum. Does VOM show the output
voltage at secondary approx. 0.5VAC?
No
Replace servo amp.
Yes
Reset VR1 and try to rotate

servo motor gears.
Is control voltage of servo
motor between terminal 2
and 4 110VAC3Vrms?
Yes
No
See Chart 8.
No
Is voltage between terminal

1 and 3 of servo motor
110VAC3Vrms?
Yes
Is resistance as follows?
Appr. 3.5 ohm betw. 2 and 4,
appr. 130 ohm betw. 1 and 3.
Replace servo motor.

Yes
No
* Can servo motor output

shaft rotate smoothly?
Replace servo motor.
* Caution: Turn off the power before seviceing.
58
Yes
Check engagement.
20220356 / D
Troubleshooting
Chart 7
Defective Master Compass Excessive noise or vibration
from Rotor Case.
No
Is rotor power voltage

between slip ring terminals
8 and 10 110VAC3Vrms?
Yes
See Chart 8
Problem
1
Remedy
Only an abnormal noise.
No service is required. The

vibration should be closely
monitored.
2 Abnormal noise and vibration

are generated during start and
stop.
No service is required now.

The vibration should be
closely monitored.
3 Abnormal noise and vibration.
Call for service, although

operations can be continued
for a while.
4 Bubble in the rotor case leveler Stop the system and call
cannot be read due to the
for service.
vibration.
(Also, an excessive noise).
Chart 8
Improper voltage from
the power supply.
No
Check ship's
power supply.
Is input voltage between

terminals D+ and D24VDC +30% -20%?
No
Replace PCB
20220356 / D
Yes
Can V control R75 of inverter

PCB be rotated for adjustment?
Yes
Adjust.
59
Chart 9
Defective Timer Circuit
No power is applied
when the preset time
has passed
The output is not turned off

3 hours after the preset time.
Errors often
occur when
timer is set.
No
Can R55 be
adjusted?
Replace PCB
No power is
applied.
Yes
Replace PCB
Note: If short-circuited J101 and J102 wires are

open, the time can be reduced to 1/600.
They must be reset after servicing.
Adjust.
Chart 10
Compass Error.
Constant error
Variable error
This can occur due to deviation of power

voltage. Check ship's power supply first,
then take the followingmeasures.
Problem
Remedy
Errors within
5 degrees occur.
Excessively large
Adjust carefully in
error may occur due
either case.
to flexible leads
contacting adjacent
components, or due
to twisted suspension
wires (due to loose
upper screws).
60
Inspect the sensitive

element and repair if
necessary. Adjustment
should be made by
the service personnel.
Problem
Remedy
Errors within
5 degrees
occur.
Check for loose connections,

contact of flexible wires of vertical
and horizontal axes, poor contact
of slip ring, excessively thight
engagement between servomotor
and gears, and malfunction in
follow-up circuit.
Note: Adjustment should be
made by service personnel.
Large errors
occur.
Check for open contacts, poor

contact of slip ring, damaget
servomotor bearings, oil leakage
from Liquid Ballistics, and failed
follow-up circuit.
Note: Adjustment should be
made by service personnel at
the field or in the factory.
20220356 / D
Parts list
10 PARTS LIST
10.1 General
This section contains the parts list and assembly drawings for
the RGC50. The assembly drawings consist of a list for all
mechanical parts that go into manufacturing the assembly, with
physical identification and location of each part by part callout
(PC) numbers. In addition, the quantity of each part required per
assembly is given, and the part number that each part is
composed of.
Note!
Part numbers shown in brackets are Tokimec part numbers.
10.2 Spare parts

The following items are the only replacement parts that are
recommended to be kept as spares for the RGC50 and the
accessory equipment. If any parts other than the ones listed here
require replacement, refer the service to a qualified RGC50
service dealer.
P/N 44137610
LAMP 24V 2W BA-9S/13 Timer ON:
P/N 44137743
LAMP 12V/60mA Compass card
P/N 44138436
FUSE: 5A, 6x30
10.3 Parts List

Syb. mark
20220356 / D
PC No.
Nomenclature
Description
Part no.
Master Compass
(102296340)
Static Inverter
27101427
(102296090)
61
10.4 RGC50 Master Compass
Symb. No.
Nomenclature
Description
Part no.
Master Compass
(102296340)
Sensitive element
44137313
(102296350)
Phantom Ring Assy
(102295980)
Binnacle assy
(102296030)
Cover assy
(102296520)
B2
Servo motor
15SM
44176964
(102290861)
B3
Synchro Transmitter
15C x 4
(102290850)
B4
Synchro Transmitter
15C x 6
(100380100)
Lamp
12V T-1, 32
(100370130)
A3
IC
SI-1020G
(102129040)
T1
Transformer
(100377151)
Servo Amp. PCB
(102296380)
L1-L4
62
PC No.
Coil Assy Primary
Pick-up
(102295840)
Coil Assy Secondary
Pick-up
(102295850)
R90
Buffer Amp. PCB
R90
Resistor
(102296400)
1.5K, 10W
(100310900)
20220356 / D
Parts list
Sensitive Element
Syb. mark
20220356 / D
PC No.
Nomenclature
Description
Part no.
Sensitive element assy
44137313
(102296350)
Gyro assy
(102296220)
Follow-up transformer
Level assy
(102290690)
Damping weight
44137958
(102200921)
Damping weight
44137966
(102200931)
Suspension wire assy
Vertical ring assy
Liquid ballistic
44137412
(102295880)
10
Horizontal ring assy
(102295890)
Primary side
Six wire type
44137354
(102295841)
44137396
(102297140)
(102295760)
Secondary side
(102295851)
63
Gyro Assembly
Syb. mark
PC No.
Nomenclature
Description
Gyro assy
64
Part no.
(102296220)
Rotor assy
#4,5,6,7 and 8
Stator assy
(102296241)
Rotor assy
(102296251)
Slinger
(102215690)
Screw (N)
(102215700)
Screw (S)
(102215710)
Bearing
Case
(102216120)
10
Case
(102216130)
11
Screw set
(000840082)
12
Screw, flat
(000630202)
13
Nut
(002630002)
14
Screw, pan
(000503082)
15
Glass
(102102090)
16
Shaft
(102216021)
17
Screw flat
(000630062)
18
Washer spring
(003830002)
19
Plate
(102216031)
20
Screw, pan
(000503102)
21
Color (N)
(102215630)
22
Spring pin
(004916062)
6 x 19 x 6
(102296230)
44177418
(102216991)
20220356 / D
Parts list
Syb. mark
PC No.
Nomenclature
Description
Part no.
23
Cover (N)
(102216040)
24
Spring
25
O ring
74137800
(007902817)
26
Color (S)
(102216060)
27
Cover (S)
(102216070)
28
Damping weight
74137958
(102200921)
29
Damping weight
44137966
(102200931)
30
Wick
FELT 110 x 6/4 x 2
74137974
(102216080)
31
Wick
FELT 110 x 6 x 5
44137982)
(102216090)
32
Wick
FELT 11 x 5 x 1
44137990
(102216100)
33
Packing
(102216110)
34
Connector housing
(100386550)
35
Receptacle
(100386560)
36
Holder, wire
(102216140)
37
Screw, pan
(000503062)
38
39
Primary coil
(102215180)
40
Plate
(102215200)
41
Printed circuit board
(102215211)
42
Capacitor
2.2F 100V
(100326650)
43
Capacitor
0.22F 400V
(100326660)
44
Screw, pan
(000502082)
45
Screw, flat
(000620084)
46
Washer
(003720004)
47
Washer spring
(003820002)
48
Nut
(002520004)
49
Shim
(102215230)
SUS304-WPB
Primary side
(102216050)
44137354
(102295841)
Vertical Ring Assembly
20220356 / D
65
Syb. mark
66
PC No.
Nomenclature
Description
Part no.
Vertical ring assy
(102295760)
Vertical ring
(102216151)
Housing A assy
Housing A
Bearing ball
Spacer
(102215080)
Retainer
(006901372)
Retainer
(006902452)
Screw, plain M3x8
(000630082)
10
Housing B assy
11
Housing B
(102216800)
12
Screw, plain M3 x 8
(000603082)
13
Shaft
14
Screw, pan M3 x 8
15
Shaft
16
Level assy
(102290690)
17
Level
(102191210)
Up side
(102295770)
(102216791)
6 x 19 x 6
Down side
E side
44137495
(102103260)
(102295780)
(102215100)
(000503082)
W side
(102215110)
20220356 / D
Parts list
Syb. mark
20220356 / D
PC No.
Nomenclature
Description
Part no.
18
Nut, hexagon M3
(002630002)
19
Plate
(102201141)
20
Screw, pan M3 x 8
(000503082)
21
Arm
(102215120)
22
Plate
(102202921)
23
Screw M3 x 8
(000630082)
24
Screw
(102103221)
25
Flame assy
(102295790)
26
Flame
(102215133)
27
Screw M3 x 20
(000503202)
28
Nut M3
(002630002)
29
Nutsert
(010401360)
30
Screw plain M3 x 8
(000503082)
31
Washer spring
(003830002)
32
Stopper
(102103120)
33
Screw pan M4 x 20
(000504142)
34
Washer
(003540002)
35
Screw plain M3 x 8
(000630082)
36
Weight t2
(102216341)
37
Holder (1) wire
(102203001)
38
Bush
(102203010)
39
Holder (2) wire
(102203020)
40
Holder (3) wire
(102203030)
41
Holder (4) wire
(102203040)
42
Stopper
(102202991)
43
Ring rubber
(102205720)
44
Flexible wire assy
44137545
(102295800)
45
PCB A assy
(102295810)
46
PCB B assy
(102295820)
47
Flexible wire
48
Liquid ballistic assy
74137412
(102295880)
49
Pipe air
(102201220)
0.03/5 Cu l25
67
Syb. mark
68
PC No.
Nomenclature
Description
Part no.
50
O ring
44137818
(007900817)
51
Galden MS
For ballistic liquid 4.6cc
52
Secondary side
(102295851)
53
Shim
For gap adj. 0.1
44137925
53
Shim
For gap adj. 0.05
44137933
54
Suspension wire assy
Six wire type
55
Screw pan M3 x 6
56
Shim
For down shaft
(102215640)
57
Shim
For down housing t0.1
(102215670)
58
Shim
For down housing t0.05
(102216510)
44138360
44137396
(102297140)
(000503062)
20220356 / D
Parts list
Horizontal Ring Axis
Syb. mark
20220356 / D
PC No.
Nomenclature
Description
Part no.
Horizontal ring assy
(102295890)
Horizontal ring
(102215292)
Housing A assy
Housing
Bearing ball
O ring
Cover
Screw, plain M3 x 5
(000630052)
Screw, pan M3 x 10
(000503102)
10
Housing assy
11
Housing
12
Cover
13
Screw
14
Shaft
E side
(102295900)
(102215300)
6 x 19 x 6
44137495
(102103260)
44137826
(007902017)
E side
W side
(102215321)
(102295910)
(102215300)
W side
(102215330)
(102215310)
N side
44177012
(102201331)
69
Syb. mark
70
PC No.
Nomenclature
Description
Part no.
15
Screw, plain M3 x 8
(000630082)
16
Screw
(000830052)
17
Shaft
18
Holder, wire
(102214081)
19
Plate assy
(102295940)
20
Screw
(000503082)
21
Plate assy
(102295950)
22
Screw
(000503082)
23
Plate assy
(102295960)
24
Cover
44137727
(102215371)
25
Screw, pan M2 x 5
(000502052)
26
Harness
(102295922)
27
Wire, flexible
44137552
(102295970)
28
Shim (t:0.1)
For horizontal axis
44137909
(102215680)
29
Shim (t:0.05)
For horizontal axis
44137919
(102216530)
S side
44177020
(102201341)
20220356 / D
Parts list
Phantom Ring Assembly
Syb. mark
20220356 / D
PC No.
Nomenclature
Description
Part no.
Phantom ring assy
(102295980)
Phantom ring
(102203430
Housing A assy
N side
(102295990
Housing
(102215380
Bearing
44137511
(102201370)
Collar
(102215390)
Cover
(102201391)
O ring
(007902917)
Screw, pan M3 x 12
(000503122)
10
Screw, plain M3 x 6
(000630062)
11
Damper, oil
Silicone oil, 100000cs 0.7cc
44138378
(102215300)
12
Housing assy
S side
(102291081)
13
Housing
(102201403)
14
Bearing
(007206061)
15
Retainer
(006901352)
16
Screw, pan M3 x 10
(000503102)
17
Shim
(102202150)
18
Card assy
(102292141)
19
Card
(102203453)
71
Syb. mark
72
PC No.
Nomenclature
Description
Part no.
20
Screw, pan M3 x 8
(000503082)
21
Pin, straight
(004720052)
22
Illumination panel assy
(102292150)
23
Terminal
(102205651)
24
Lamp
(100370130)
25
Screw, pan M3 x 6
(000503062)
26
Slip ring assy
(102296012)
27
Screw, plain M3 x 8
(000630082)
28
Bearing, ball
29
Retainer
(006901442)
30
Gear, spur
(102201424)
31
Screw, plain M3 x 8
(000630082)
32
Plate assy
(102296000)
33
Screw, pan M3 x 8
(000503082)
34
Resistor
35
Pin
(083314111)
36
Stopper
(102103120)
37
Screw, pan M4 x 25
(000540252)
38
Washer, plain M4
(003740002)
39
Washer, spring M4
(003840002)
40
Nut, hexagon M4
(002540004)
41
Harness
(102292101)
42
Holder, wire
(102203052)
43
Screw, pan M3 x 6
(000503062)
44
Buffer Amp. Assy
(102296460)
45
Buffer Amp.
44141463
(102296400)
12 x 28 x 8
1.5k, 10W
(007260011)
(100310900)
20220356 / D
Parts list
Binnacle
Syb. mark
PC No.
Nomenclature
Part no.
Binnacle
(102296030)
Azimuth motor assy
(102290802)
Servo motor
20220356 / D
Description
44176964
Screw, pan M3 x 12
(000503122)
Transmitter PCB
44176774
(102290831)
Screw, pan M3 x 14
(000503142)
Follow-up amplifier assy
(102291760)
Support
(084222211)
Screw, pan M3 x 8
(000503082)
Transformer
(100377151)
10
IC
(102129040)
11
Screw, pan M3 x 10
(000503102)
12
Brush assy
44137578
(102296510)
13
Shaft
(102201671)
14
Screw, plain M3 x 8
(000630082)
15
Retainer
(006902352)
16
Base
(102203514)
73
Syb. mark
74
PC No.
Nomenclature
Description
Part no.
17
Pointer assy
(102291652)
18
Screw, pan M3 x 6
(000503062)
19
Bridge
(102203462)
20
Screw, pan M4 x 10
(000504102)
21
Stand
22
Plate
(102203521)
23
Screw, pan M3 x 6
(000530062)
24
Washer, spring M3
(003830002)
25
Screw, plain M5 x 8
(000650082)
26
Shaft
(102203541)
27
Screw, set M3 x
(000830052)
28
Stopper assy
(102290931)
29
Spring, coil
(102201812)
30
Plate
(102201820)
31
Cushion
(102213210)
32
Spring, coil
(102201803)
33
Cup
(102208034)
34
O ring
(007902117)
35
Spring, coil
(102208051)
36
Shock absorber
(102208170)
37
Shaft
(102201775)
38
Washer, spring M6
(003860002)
39
Nut, hexagon M6
(002560004)
40
Retainer
(102202060)
41
Spring, plate
(102201751)
42
Screw, pan M2x 3
(000520032)
43
Washer, plain M2
(003720002)
44
Washer, spring
(003820002)
45
Plate
(102213200)
46
Stopper
(102208181)
47
Shock absorber assy
(102290945)
48
Stand
(102201863)
49
Screw, pan M3 x 10
(000503102)
For connector
(102202902)
20220356 / D
Parts list
Syb. mark
20220356 / D
PC No.
Nomenclature
Description
Part no.
50
Shock absorber assy
(102290895)
51
Stand
(102202942)
52
Shock absorber assy
(102290926)
53
Stand
(102201854)
54
Seal
(102203532)
55
Cable assy
(102296080)
56
Connector
(084121014)
57
Clamp
(100305710)
58
Screw
(100305690)
59
Harbess
(102296360)
60
Clamp
(009907120)
61
Clamp
(009907110)
62
Retainer
(102207050)
63
Screw, pan M3 x 10
(000503102)
64
Transmitter assy
90x option
44141695
(102295441)
65
Screw, pan M3 x 12
90x option
(000503122)
75
Azimuth Motor Assy
Syb. mark
76
PC No.
Nomenclature
Description
Part no.
Azimuth motor assy
(102290802)
Housing
(102201452)
Servo motor
44176964
(102290861)
Plate, retainer
(102201470)
Screw, PAN M3 x 8
Gear
(102212010)
Bearing
(102201490)
Gear
(102290811)
Pin, roll
(004916127)
10
Gear
(102290822)
11
Collar
(102201550)
12
Retainer
(006902292)
4 x 13 x 5
(000503082)
20220356 / D
Parts list
Transmitter assy
Syb. mark
20220356 / D
PC No.
Nomenclature
Description
Part no.
Transmitter assy
(102290831)
Housing
(102201572)
Transmitter
Plate, retainer
(102201611)
Screw, PAN M3 x 10
(000503102)
Gear
(102290840)
Screw, SET M3 x 4
(000830041)
Housing
(102201621)
Screw, PAN M3 x 8
(000503082)
10
Bearing, ball
(102213190)
11
Gear
(102201642)
12
Gear
(102201651)
13
Pin, roll
(004912122)
15c x 4
(102290850)
77
Follow-up amplifier PCB
Syb. mark
PC No.
Nomenclature
Follow-up amplifier assy
78
Description
Part no.
44176733
20220356 / D
Parts list
Cover Assy
Syb. mark
20220356 / D
PC No.
Nomenclature
Description
Part no.
Cover assy
(102296520
Glass
44137776
(102295211)
Name plate
Cover
(102203558)
Panel
(102203563)
Seal
(102203583)
Plate
(102203592)
Screw, PAN M3 x 6
(000503062)
O ring
(007901217)
10
Screw
(102203600)
11
Name plate
79
Buffer Amplifier PCB
Syb. mark
PC No.
Nomenclature
Buffer amplifier assy
80
Description
Part no.
44141463
20220356 / D
Parts list
10.5 Static Inverter
Syb. mark
T1
NS1
20220356 / D
PC No.
Nomenclature
Description
Part no.
Static Inverter
27101427
(102296090)
Switch panel assy
(102292340)
Screw, PAN M5 x 12
(000504102)
Chassis assy
(102296100)
Screw, PAN M4 x 10
(000504102)
Cover
Hinge
(102214261)
Cover
(102203645)
Screw, M5 x 15
(102203661)
10
Blind plug
(102203651)
11
Gasket
(102203670)
12
Case
(102214640)
13
Screw
Rear
Wing
(102214250)
(200212030)
Transformer
(100377680)
Filter
(100377031)
81
Switch Panel Assy
Switch Panel Assy, previous version.

Valid for Master Compass with ser. no. M7173 and below
82
20220356 / D
Parts list
Symb. No.
PC No.
Nomenclature
Description
Part no.
Switch panel assy
(102292348)
Screw, PAN M5 x 12
(000505122)
Panel
(102203866)
Name Plate
(102208542)
XF1
Holder, fuse
(082315111)
F1
Fuse element
5A
(082315018)
CR15
LED
SDB205B
(100370050)
XPL1
Holder, Lamp
PL1
Lamp
10
Setting dial
(102292350)
11
Knob
(102205600)
12
Dial plate
(102205580)
13
Base
(102205590)
R42
14
Resistor, variable
500Kohm
S1
15
Switch
16
Knob
Parts no longer available. Complete

Switch Panel Assy to be replaced with
new version.
17
Resistor, variable
18
Knob
(100307240)
19
Support
(200220120)
20
Screw, plain M3 x 8
(000630084)
21
Screw, PAN M3 x 8
(000503082)
22
Plate
(102203882)
R41
(114500640)
24V, 2W
1Kohm, 10W
(081000010)
(042145504)
RVF10SE15R1K-KK
Switch Panel Parts, previous version
20220356 / D
83
Switch Panel Assy, new version.

Valid for Master Compass ser. no. M7174 onwards
84
20220356 / D
Parts list
Symb. No.
PC No.
Nomenclature
Description
Part no.
Switch panel assy
(102292348)
Screw, PAN M5 x 12
(000505122)
Panel
(102203866)
Name Plate
(102208542)
XF1
Holder, fuse
(082315111)
F1
Fuse element
5A
(082315018)
CR15
LED
SDB205B
(100370050)
XPL1
Holder, Lamp
PL1
Lamp
10
Setting dial
(102292350)
11
Knob
(102205600)
12
Dial plate
(102205580)
13
Base
(102205590)
R42
14
Resistor, variable
S1
15
Switch
MRX-204
16
Knob
AT-4104
17
Resistor, variable
18
Knob
(100307240)
19
Support
(200220120)
20
Screw, plain M3 x 8
(000630084)
21
Screw, PAN M3 x 8
(000503082)
22
Plate
(102203882)
23
Plate
(10222106-)
24
Screw, Flat M3X6
25
Support Plate
26
Screw, Flat M3X6
27
SWRY pwb
28
Screw, Pan M3X8
R41
(114500640)
24V, 2W
500Kohm
100Kohm
(081000010)
(042145504)
(042114104)
(2-000630062)
(10222105-)
(2-000630062)
(10229911-)
(4-000503082)
Switch Panel Parts, new version
20220356 / D
85
Chassis Assembly
Syb. mark
PC No.
Nomenclature
Description
Part no.
Chassis assy
(102296100)
Chassis
(102215481)
Inverter assy
27101559
(102295745)
Screw, PAN M3 x 10
(000503102)
10
Support
(102220190)
11
Transformer
(100377680)
12
Screw, PAN M4 x 8
(000504082)
15
Cable assy
(102296110)
16
Harness
17
Harness
Main
(102296210)
(102295430)
Chassis Assembly
86
20220356 / D
Parts list
Inverter board PCB
Syb. mark
PC No.
1
20220356 / D
Nomenclature
Inverter board
Description
Part no.
44178184
(1022957407)
87
11 DRAWINGS
11.1 General
This section contains dimensional drawing and schematic
diagrams for the RGC50 gyrocompass.
88
20220356 / D
321 (12.6)
200
(7.9)
184
(7.2)
228 (9)
170
(6.7)
80
(3.1)
228
(9)
300
377
(14.8)
63 (2.5)
3.5 (0.1)
SCREW HOLE X4
A
B
C
D
E
ITEM
UNIT
DIMENSIONS IN mm (inches)
MASTER COMPASS
STATIC INVERTER
SCREEN
SIGNAL INTERFACE UNIT
INTERCONNECTION CABLE
CABLE
ENTRANCE
42
(1.7)
199
(11.8)
253
(10)
124
(4.9)
N3-710153
8.0 Kg
7.5 Kg
0.1 Kg
0.9 Kg
WEIGHT
(7.8)
20220356 / D
SCREW HOLE
X4
SERVICE AREA
SERVICE AREA
Drawings
11.2 RGC50 dimensions
89
11.3 Master compass schematic diagram
90
20220356 / D
Drawings
11.4 RGC50 Block diagram

MASTER COMPASS
MOTOR / ROTOR
COMPASS CARD
P.U. TRAFO
110V AC
FLEX
WIRE (3)
VERT. RING
FLEX
WIRE (3)
HOR. RING
ILLUMINATION
FLEX
WIRE (3)
FLEX
WIRE (2)
PHANTOM RING
1:1 GEAR
BUFFER
AMP.
FU
MOTOR
R1-R2
X-MIT
15CX4
SLIP
RINGS (6)
110V 400Hz
TRAFO
FU
AMP.
T1
POWER AMP.
PLUG (15 PIN)
From dim. potm.
INTERFACE / AUTOPILOT
SWITCH PANEL
FILTER
1:1 110V 400Hz
24VDC
STATIC
INVERTER
PCB
TERMINAL
110V 400Hz
TRAFO
15V
TIMER
T1
STATIC INVERTER
RGC50 GYROCOMPASS
20220356 / D
91
11.5 Static Inverter
Static Inverter Wiring Diagram
92
20220356 / D
Drawings
Switch Panel Wiring Diagram.

Valid for Master Compass ser. no. M7385 onwards.
SWRY PWB Circuit Diagram.

Valid for Master Compass ser. no. M7174 onwards
20220356 / D
93
Main terminal connections
Main
terminal
board
94
20220356 / D

RGC50 Instruction Manual

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RGC50 Instruction Manual

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INSTRUCTION MANUAL

Simrad RGC50 Gyro compass

New layout. Modified text.

Schematic for Static Inverter updated (page 92).

New Inverter PCB. New potentiometer in dimmer circuit.

To assist us in making improvements to the product and to this manual, we would

How to use this manual ..................................................................................1

Equipment supplied ........................................................................................1

Operating method with timer..........................................................................3

Operating method without timer.....................................................................4

Turn Off ..........................................................................................................4

Connecting an NMEA repeater ......................................................................4

NMEA repeater syncronization ......................................................................4

Speed error correction ....................................................................................4

TECHNICAL SPECIFICATIONS ...........................................7

ASSEMBLY AND INSTALLATION ........................................9

Preparation for installation .............................................................................9

Electrical warnings ....................................................................................9

Standard equipment supplied...................................................................10

Mechanical mounting ...................................................................................16

Checking and correction of errors ................................................................18

Checking the timer........................................................................................18

General information about RGC50 signal output and connected equipment19

PRINCIPLE OF OPERATION .............................................21

Master Compass ...........................................................................................21

Simrad RGC50 Gyro compass

Sensitive element .................................................................................................... 21

Gyro rotor and Damping weight ..............................................................21

Phantom ring, Servo motor and Gear mechanism ...................................24

Inverter unit ..................................................................................................24

Master compass ............................................................................................25

Vertical balance (east-west direction) .....................................................25

Heading error less than 2 degrees..........................................................27

Inverter board ...............................................................................................31

Special tools/units for adjustment.................................................................35

Removing sensitive element ....................................................................37

Disassembling liquid ballistic..................................................................40

Assembling Rotor ....................................................................................46

Final confirmation ........................................................................................51

CHECK SHEET FOR RGC50 .....................................................................52

Sensitive element .....................................................................................52

10 PARTS LIST .....................................................................61

Gyro Assembly ........................................................................................64

Azimuth Motor Assy ..............................................................................76

Simrad RGC50 Gyro compass

Cover Assy ............................................................................................................ 79

10.5 Static Inverter ...............................................................................................81

Inverter board PCB ..................................................................................87

How to use this manual

RGC50 Master compass unit

Inverter unit, including power converter and control panel

Viewing screen (plastic piece that fits on top of master

Simrad RGC50 Gyro compass

Figure 2-1 Gyrocompass control panel

Operating method with timer

Set the master switch (1) to the TIMER position.

Set the PRESENT TIME setting scale plate (2) to the

Set the ETD setting knob (3) to the scheduled ETD

By the above operations, the gyrocompass will be operative at