Tension Electronics PFEA113, User Manual
Appendix B PFCL 301E - Designing the Load Cell Installation
B-4
3BSE029382R0101 Rev C
B.5 Mounting Alternatives, Calculating Force and Calculating Wrap Gain
B.5.1 Horizontal Mounting
In most cases, horizontal mounting is the most obvious
and simplest solution. The load cell should thus be
mounted horizontally when possible.
However, should the machine design require inclined
mounting of the load cell or should the web path not give
a sufficient vertical force, see figure, the inclined
mounting is permitted and the calculations are somewhat
more complex, (see
The PFCL 301E load cell measures the vertical forces
applied to its top surface. The horizontal applied forces are
not measured and do not influence the vertical
measurement. There are two sources of vertical forces; the
forces from the web tension and the tare weight of the roll.
Divide the total vertical force F
Rtot
by two to get the
required capacity of each load cell.
Do not oversize an ABB load cell for overload purposes
as the load cell has sufficient overload capacity.
A PFCL 301E load cell can measure tension as well as
compression.
If the T (sin
+
sin
) is larger than the tare weight, the
load cell will be in tension.
To get the capacity of each load cell:
1. Divide (F
R
- Tare) by two
if F
R
is greater than or equal to (Tare × two).
2. Divide Tare by two
if F
R
is smaller than (Tare × two).
Tare
T
T
No vertical web tension force
applied to the load cell.
PFCL 301E
Tare
F
R
T
T
F
R
= T × (sin
+ sin
)
F
Rtot
= F
R
+ F
RT
= T × (sin
+ sin
) + Tare
F
RT
= Tare
Wrap gain
T
FR
--------
T
T
sin
sin
+
----------------------------------------
=
=
Wrap gain
1
sin
sin
+
-------------------------------
=
T (Tension)
Wrap gain
FR
=
Tare
F
R
T
T
F
Rtot
= F
RT
F
R
= Tare
T × (sin
+ sin
)
F
RT
= Tare
F
R
= T × (sin
+ sin
)
Wrap gain
T
FR
--------
T
T
sin
sin
+
----------------------------------------
=
=
Wrap gain
1
sin
sin
+
-------------------------------
=
T (Tension)
Wrap gain
FR
=
Summary of Contents for PFEA 113
Page 32: ...Tension Electronics PFEA113 User Manual Chapter 2 Installation 2 16 3BSE029382R0101 Rev C ...
Page 92: ...Tension Electronics PFEA113 User Manual Chapter 5 Maintenance 5 2 3BSE029382R0101 Rev C ...
Page 104: ...Tension Electronics PFEA113 User Manual Chapter 6 Fault tracing 6 12 3BSE029382R0101 Rev C ...
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