Measurement Technology NW
LCI-90 Operator Manual
Page 35
5.8
Sensor Angle (two-axis input configurations)
To set the sensor angle for a two-axis load-pin application, press
CALB
to display the main
2.0 CALIBRATION
menu shown below. Select Item 4 and press
ENT
to activate the edit
keys. Use the
INCR
,
DECR
and
keys to change the value. Press
ENT
to save the new
value or
ESC
to cancel the changes. Note that Sensor Angle replaces Wrap Angle when
the input configuration is set to
2-AXIS
mode; neither angle is displayed in
SUM
mode.
2.0 CALIBRATION
1
TENSION (THREE METHODS)
2
TENSION TARE
OFF
3
SHUNT CAL
OFF
>
4
SENSOR ANGLE
0 DEG
5
PAYOUT SCALE
2.800 P/FT
6
PAYOUT PRESET
150 FT
5.8.1 Sensor Angle Correction for Dual-Axis Load Pins
Dual-axis load pins are used in applications where the wrap angle varies. A dual axis
load pin is constructed with two independent measurement bridges oriented 90
from
each other, one labeled ‘x’, the other ‘y’. The LCI-90 combines these signals to cal-
culate the actual line tension, which is independent of the wrap angle. However, the
calculation is only correct if the ‘y’ axis of the sensor is aligned exactly parallel to the
winch line. (See §4.1.2 for sensor hookup, and §§12-13 for geometrical definitions.)
Even small deviations from this orientation can lead to substantial errors, which can
be corrected by specifying a non-zero Sensor Angle.
An angle of ‘0’ corresponds to the ‘ideal geometry’ shown in §12. Positive angles
represent a rotation of the x-axis toward the load, while negative angles represent a
rotation of the x-axis away from the load. (The drawing in §13 shows a positive
sensor angle.) While two-axis load pins are usually mounted quite accurately, the
Sensor Angle adjustment allows the LCI-90 to work properly in non-standard instal-
lations. This adjustment can also be used to compensate for mis-aligned single-axis
load pins; contact the factory for additional information.
