Coordinate System - ABB PFEA 111 User Manual

T = Web tension.
Tare = Force of tare (weight of roll and bearing arrangement
mounted on the load cells)
F = Measured force (force component of the web tension
R
in the measuring direction of the load cell).
F = Applied force component of tare in the measuring
RT
direction of the load cell.
F = Total applied force in the measuring direction of the
Rtot
load cell.
Wrap Gain = The ratio between web tension, T, and
measured force, F
A.2.1 Coordinate System
Figure A-1. Coordinate System Defining Directions used in Force Calculations
3BSE029380R0101 Rev C
.
R
A coordinate system is defined for the load cell. This is used in force calculations to derive force
components in the load cell principal directions.
Where direction designations R, V and A are recognized as suffixes for force components, F,
this represents the force component in the respective direction. The suffix R may be omitted,
when measuring direction is implied by the context.
R
V
A A
V
R
Tension Electronics PFEA111/112, User Manual
Table A-1. Definitions
Example:
R = Measuring direction
V = Transverse direction
A = Axial direction
Section A.2.1 Coordinate System
Wrap angle
T
F
R
F = T
R
T
Wrap gain =
F
R
T
Wrap gain
= = 1.00
T
Wrap gain = 1.00
V
R
A
R
V
T
A
A-3