Mounting Alternatives, Calculating Force And Calculating Wrap Gain; Horizontal Mounting - ABB PFEA 111 User Manual

D.6 Mounting Alternatives, Calculating Force and Calculating Wrap Gain
D.6.1 Horizontal Mounting
No horizontal web tension force
applied to the load cell.
F
R
F
RT
F
Rtot
F
Rtot
T (Tension)
Wrap gain
Wrap gain
3BSE029380R0101 Rev C
Section D.6 Mounting Alternatives, Calculating Force and Calculating Wrap Gain
Tare
T
T
Horizontal plane
+
+
T
F
R
T
Tare
= T × (cos   cos )
= 0 (Tare force is not measured)
= T × (cos   cos )
= F + F
R RT
/ load cell = F / 2
Rtot

= Wrap gain F
R
T T
------- - ------------------------------------------
= =
 
F T cos cos
–
R
1
= ---------------------------------
 
cos – cos
Tension Electronics PFEA111/112, User Manual
The PFRL 101 load cells can be mounted at any incline
angle, 0 - 360°. However, it is recommended to minimize
the influence of forces other than the tension to be
measured. In most cases this means an orientation where
the tare force (vertical) is perpendicular to the measured
force (horizontal).
However, should the machine design require inclined
mounting of the load cell or should the web path not give
a sufficient horizontal force, see figure, the inclined
mounting is permitted and the calculations are somewhat
more complex, (see
The load cell measures the horizontal forces. The load
cell can measure in both directions. The vertical applied
forces are not measured and do not influence the
horizontal measurement. There is one source of
horizontal forces, the force from the web tension (the tare
weight has no force component in measuring direction).
See force calculations in figure.
Divide the total vertical force F
required capacity of each load cell.
Do not oversize an ABB load cell for overload purposes
as the load cell has sufficient overload capacity.
 
Section D.6.2, Inclined Mounting).
by two to get the
Rtot
D-5