Orbit OceanTRx7 Instructions for use
COMMUNICATION WITHOUT BOUNDARIES
Orbit Communication Systems Ltd. P.O.B. 42504, Israel, Tel: +(972) 9 892 2777, Fax: +(972) 9 885 5944 www.orbit-cs.com
OceanTRx7TM
Maritime Stabilized VSAT System
Technical Note
Inertial Measurement Unit (IMU)
Document: TEC32-1664-001, Revision A
January 2013
TEC32-1664-001 OceanTRx7™ IMU Technical Note ii
Copyright
© 2013 Orbit Communication Systems Ltd. All rights reserved.
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No part of this publication may be reproduced, transmitted, transcribed, stored in a
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Communication Systems Ltd.
Disclaimer of Warranty
Orbit Communication Systems Ltd. has made every effort to ensure the accuracy and
relevancy of the material in this document. It is expected that all sections of this
document will be read thoroughly and that all information and procedures should be
fully understood.
However, Orbit Communication Systems Ltd. assumes no responsibility for any errors
that may appear in this document, and reserves the right to make changes to the
document without notice.
Orbit Communication Systems Ltd. makes no warranty of any kind in regard to this
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assumes no responsibility for incidental or consequential damages arising due to
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TEC32-1664-001 OceanTRx7™ IMU Technical Note iii
Revision History and Control
Revision History
Rev #
Modified by
Date
Comments
Rev. A
Edox
TEC32-1664-001 OceanTRx7™ IMU Technical Note iv
About this Manual
This manual is designed to guide you through the procedures required for maintaining the
Inertial Measurement Unit (IMU) for the OceanTRx7™ Maritime Satellite Communication
System.
Text Conventions
Style
Indicates
Example
Text
Normal descriptive text
Contents
Text
Words or figures that appear on the
screen or that should be typed
The name of a file or directory
System Status
<Text>
A key to be pressed
<ESC>
TEXT
The name of a hardware
component
ANTENNA
Text
The name of a GUI element
Operation Screen
The description of a procedure
To configure…
Notations
Indicates important information that should be noted.
Indicates a potential hazard.
Indicates the safest method of installation or an operation that must be adhered
to.
TEC32-1664-001 OceanTRx7™ IMU Technical Note v
Effective Releases
This document is effective for Release 1 (R1) and Release 2 (R2) of the OceanTRx7™
Maritime Satellite Communication System.
For a description of the changes between R1 and R2, refer to the
OceanTRx7™Maritime
Satellite Communication System Release Notes
.
TEC32-1664-001 OceanTRx7™ IMU Technical Note vi
Table of Contents
1Introduction .......................................................................................................................1
1.1 Purpose......................................................................................................................1
1.2 Principles ...................................................................................................................1
1.2.1 Torque Table .........................................................................................................1
1.3 IMU Description .........................................................................................................2
1.4 Spare Kit Contents.....................................................................................................3
1.5 Required Tools and Parts ..........................................................................................3
2Preliminary Procedures.....................................................................................................4
3Replacing the IMU.............................................................................................................5
3.1 Removing the IMU .....................................................................................................5
3.2 Installing an IMU ........................................................................................................7
4Software............................................................................................................................9
4.1 Configuring the IMU Calibration File ..........................................................................9
4.2 Updating the system with General Software update module (GSU) ........................10
4.2.1 Verify actual software version of the system units...............................................12
4.3 Verifying System Function .......................................................................................13
5Appendix A: Replacing IMU’s cable (R1 with R2). .......................................................... 14
5.1 Removing IMU’s Cable (ANTENA R1). ....................................................................14
5.2 Installing IMU’s (R2) Cable. .....................................................................................15
TEC32-1664-001 OceanTRx7™ IMU Technical Note Page 1 of 15
1Introduction
1.1 Purpose
The purpose of this Technical Note is to provide detailed instructions on how to replace and
configure an IMU.
1.2 Principles
The following principles must be followed when performing the procedures in this Technical
Note.
1.2.1 Torque Table
The following table provides the torque that should be used when tightening screws of the
listed types, as relevant.
Table 1-1: Torque Values
Screw Type
Torque
M8
25N/m
M6
10.2N/m
M5
6N/m
M4
2.5N/m
M3
1.35N/m
TEC32-1664-001 OceanTRx7™ IMU Technical Note Page 2 of 15
1.3 IMU Description
A strap-down solid-state INERTIAL MEASUREMENT UNIT (IMU) is installed on the PEDESTAL
and provides extremely accurate dynamic readings of the platform’s sea movement to the
ACU. The ACU stabilizes the ANTENNA accordingly in real-time via the SERVO SUBSYSTEM.
The IMU reports the following data:
Pitch and roll –Short-term data measured by two RATE-GYRO SENSORS
dynamically integrated by the ACU with long-term data measured by two
INCLINOMETERS.
Yaw variations –Short-term data measured by a RATE-GYRO SENSOR,
dynamically integrated by the ACU with long-term yaw data received from the
ship’s gyrocompass.
Figure 1-1: Inertial Measurement Unit
TEC32-1664-001 OceanTRx7™ IMU Technical Note Page 3 of 15
1.4 Spare Kit Contents
The following table provides a list of the parts in the IMU spare kit.
Table 1-2: Spare Part Kit Contents
KIT32-1664-006-SP
P/N
Description
Quantity
30-0713-9-1
CABLE PEDESTAL TO IMU PANEL AL-7107
1
30-0713-9-4
CABLE POWER BOX R2 TO IMU R1 AL-7107-SYS2
1
H06016072001
SCKT CAP SCR M6X20 ST.ST.
4
H20216091072
FLAT RD WASHER M6 SS 316
4
H28216091072
HELIC SPR WASHER M6 SS 316
4
L01323001
INERTIAL MEASUREMENT UNIT (IMU)
1
PKG-049
PKG BOX 240X150X130mm RSC
1
1.5 Required Tools and Parts
The following table provides a list of tools and customer-supplied parts that are needed to
perform the procedures in this Technical Note.
Table 1-3: Required Tools and Parts
Tool/Part Name
Notes
Figure
Allen key, 5mm
TEC32-1664-001 OceanTRx7™ IMU Technical Note Page 4 of 15
2Preliminary Procedures
The preliminary procedure described below must be performed before replacing the IMU.
1. Perform System Shut-Down of the vessel’s main power AC Voltage terminal outside the
RADOME.
2. Open the RADOME hatch.
3. Switch off the ADE POWER BOX at the ANTENNA PEDESTAL base (located inside the
RADOME).
4. Manually rotate the PEDESTAL AXES to gain convenient access to the serviced unit.
In the following procedures, be very careful when tightening and loosening the
screws with which the parts are assembled and attached to the system. Some of
these screws are delicate and can be damaged by excess force. When using an
Allen key make sure to insert the key all the way into the screw head to avoid
thread stripping.
WARNING!
The Utility Outlet is connected directly to the vessel’s AC voltage input
terminals (125 VAC / 250 VAC). Therefore, there still exists live voltage at the
Utility Outlet after disconnecting the power supply to the ADE using the Mains
Power On/Off Switch.
Only qualified and authorized personnel are allowed to carry out system
service/maintenance procedures.
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