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IMU User Guide revision 3.1 SMC Ship Motion Control www.shipmotion.eu
Mounting orientation
The Motion Sensor is calibrated from the factory for either Deck or Sideways orientation. Deck
orientation is when the Motion Sensor is mounted on a horizontal surface with the connector
pointing upwards. Deck mounting calibration is the default orientation. Sideways orientation is when
the motion sensor is calibrated to be mounted on a vertical surface.
A motion sensor that has been calibrated for Deck mounting cannot be used in a sideways mounting
and vice versa without recalibration of the motion sensor at the factory.
3.2
MOUNTING INSTRUCTIONS
The Motion sensor base plate has been specifically designed to enable ease of installation and
alignment.
The SMC Motion sensor is shipped without mounting screws or bolts. The base plate can be fixed
with M6 (max M8) screws or bolts with washers. The dimensions of the motion sensor for the
mounting locations can be found in
Chapter 3.6
After drilling any holes for mounting, be sure to de-burr the holes and clean the mounting location of
any debris that can induce mounting offsets.
Mount and screw the motion sensor in position, make sure to align the motion sensor as accurately
as possible with the vessels coordinate system.
A motion sensor calibrated for deck mounting/horizontal surface, must be mounted with the
connector pointing upwards. It is
not
designed to be mounted with the connector pointing
downwards.
In the SMC IMU Configuration Software there is a function to fine tune the motion sensor alignment
in the X, Y and Z axis. This setting will rotate the coordinate system inside the motion sensor. See
chapter 4.1
on IMU Configuration Software for further instructions.
When mounting the motion sensor sideways there are 4 mounting options in the SMC IMU
Configuration Software to rotate its coordinate system correctly. For more information, see
chapter
3.5
for sideways calibrated setup. If an incorrect mounting selection is chosen, the coordinate system
will be inverted. In this case, the roll motion will become the pitch motion or alternatively the
positive negative rotation of the angles will be inverted.
When the motion sensor is calibrated for sideways mounting, connector pointing horizontally, and is
mounted upside down, with the single notch pointing in the wrong direction, the output signal from
the motion sensor will display
–
180 degrees wrong angle for roll output. If the Motion Sensor is
mounted incorrectly it will not work within its calibrated range and will output inaccurate values.