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

Tension Electronics PFEA111/112, User Manual
Appendix F PFCL 201 - Designing the Load Cell Installation
F.5 Mounting Alternatives, Calculating Force and Calculating Wrap Gain
F.5.1 Horizontal Mounting
PFCL 201
No vertical web tension force
applied to the load cell.
= T × (sin + sin )
F
R
F
RT
F
Rtot
T (Tension)
Wrap gain
Wrap gain
T

= T × (sin + sin )
F
R
F
RT
F
Rtot
T (Tension)
Wrap gain
Wrap gain
F-4
Tare

Tare
T
F
R
= Tare
= T × (sin  + sin ) + Tare
= F + F
R RT

= Wrap gain F
R
T T
= ------- - = --------------------------------------- -
  
F T sin + sin
R
1
= ------------------------------ -
 
sin + sin
F
R
T
Tare
= Tare
 F = Tare  T × (sin  + sin )
= F
RT R

= Wrap gain F
R
T T
------- - --------------------------------------- -
= =
  
F T sin + sin
R
1
= ------------------------------ -
 
sin + sin
In most cases, horizontal mounting is the most obvious
T
and simplest solution. The load cell should thus be
mounted horizontally when possible.
However, should the machine design require inclined
T
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 load cell measures the vertical forces applied to its top
surface. The horizontal applied forces are not measured
T
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
required capacity of each load cell.
Do not oversize an ABB load cell for overload purposes
as the load cell has sufficient overload capacity.

The 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
if F
R
2. Divide Tare by two
if F
R

Section F.5.2).
Rtot
- Tare) by two
R
is greater than or equal to (Tare × two).
is smaller than (Tare × two).
3BSE029380R0101 Rev C
by two to get the