Step-By-Step Guide For Designing The Load Cell Installation - ABB PFEA 111 User Manual

Tension Electronics PFEA111/112, User Manual
Appendix D PFRL 101 - Designing the Load Cell Installation
D.3 Step-by-Step Guide for Designing the Load Cell Installation
D-2
The procedure below defines the main considerations involved in designing a load cell
installation.
1. Check load cell data so that environmental demands are met.
2. Calculate forces; vertical, horizontal and axial (cross directional).
3. Size and orient load cell so that the guidelines below are met:
a. Try to achieve a measured value no less than 10% of web tension, in the load cell
measurement direction!
b. Select load cell size so that it is loaded as close as possible to its nominal load! Do
not dimension Force component of Tension in measuring direction, F
10% of the load cell nominal load!
c. If the span between maximum and minimum tension in the process is large, select
load cell so that the maximum tension will be in the load cell extended range (when
applicable)!
d. The measured force component of web tension is recommended to be at least 30% of
tare force component (roll weight) acting in load cell measurement direction. The
reason for this recommendation is load cell signal stability, especially when the
system operates in a large temperature span.
This means that if F
For larger F , lowest F
RT
T
100%
e. Check load cell data so that limits for building height, transverse and axial forces are
not exceeded.
4. Design base frame and/or adapter plates.
< 1/3 of F , F should be at least 10% of F
RT nom R
is recommended to be at least 30% of F
R
T
Rule 1: If F
F
F
R
> 30%
Rule 2: If F
F
F
RT
F = Force component of web tension in measuring direction
R
F = Tare force in measurement direction
RT
R
nom
.
RT
< 1/3 of F
RT nom
should be at least 10% of F
R
> 1/3 of F
RT nom
is recommended to be at least 30% of F
R
3BSE029380R0101 Rev C
, for less than
.
nom
RT