SUMMATION A+B
INDIVIDUELL A
DIFFERENS A-B
INDIVIDUELL B
A
Sum A+B
Differential A-B
B
Load cells
Adapter plates
Junction box
Load cell cabling
Control unit
Output signals
Figure 1. Complete Measuring System
1.3.2
Load Cells PFCL 201
The load cells are installed under the roll bearings, where they measure forces at right angles to the
mounting surface.
The reactive force from the strip, which is proportional to the strip tension, is transferred to the load
cells via the roll and the bearings.
The load cells are connected to the control unit via a junction box. The control unit converts the
load cell signals to DC voltages that are proportional to the reaction force. Depending on which
control unit is chosen, it is possible to have the analog signals for the two individual load cells (A
and B), the sum of the load cell signals (A+B), and/or the difference between the load cell signals
(A-B).
1.3.3
Principle of Measurement
The load cell only measures force in the direction F
R
. The measurement force may be positive or
negative. The load cell is normally installed under the roll bearings. When there is a strip in tension
over the roll, the tension (T) gives rise to two force components, one in the direction of measure-
ment of the load cell (F
R
) and one at right angles (F
V
).
The measuring force depends on the relationship between the tension (T) and the wrap angle
formed by the strip around the measuring roll.
Pressductor PillowBlock Load Cells, Vertical Measuring PFCL 201, User Manual
1 Introduction
3BSE023881R0101 en Rev H
7
Summary of Contents for PFCL 201
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