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Description
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).
ABB PFCL201 Pressductor Pillowblock Load
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 FR. 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 (FR) and one at right angles (FV).
The measuring force depends on the relationship between the tension (T) and the wrap angle
formed by the strip around the measuring roll.
General
The load cell is machined from a single piece of stainless steel. The sensors are machined directly
in the piece of steel and are positioned so that they are sensitive to force in the direction of meas urement and insensitive in other directions.
The load cell is mounted on a base with four screws, and the bearing housing is mounted on top
of the load cell with four screws.
Every load cell comes calibrated and temperature compensated.
The load cells PFCL 201C/201CE/201CD are available in four measurement ranges, all variants
have the same external dimensions.
The load cell PFCL 201C is equipped with a connector for the pluggable connection cable.
The load cell PFCL 201CE has a fiWed connection cable with protective hose.
The load cell PFCL 201CD is provided with an acid-proof cable gland with a fiWed PTFE- insulated
connection cable.
Technical Data
Table 1 Technical Data Load Cell PFCL 201
PFCL 201 Type Data Unit
Nominal Loads 1)
Nominal load in measuring direc tion, Fnom
C/CD/CE 5 10 20 50 kN
Permitted transverse force within
the accuracy, FVnom (for h = 300mm)
2,5 5 10 25
Permitted axial load within the
accuracy, FAnom (for h = 300 mm)
1,25 2,5 5 12.5
Extended load in measuring direc tion with accuracy class ±1%, Fext7,5 15 30 75
Max permitted load
In the direction of measurement
without permanent change of data,Fmax2)
C/CD/CE 50 100 200 5003) kN
In the transverse direction without
permanent change of data, FVmax2)
(for h = 300 mm)
12,5 25 50 125
Spring constant C/CD/CE 250 500 1000 2500 kN/mm
Mechanical data
Length C/CD/CE 450 mm
Width C 110
CD 138
CE 156
Height C/CD/CE 124,6
Weight 37 kg
Material C/CD/CE Stainless steel SIS 2387 DIN X4CrNiMo 165
Accuracy
Accuracy class C/CD/CE ± 0,5 %
Linearity deviation < ± 0,3
Repeatability error < ± 0,05
Hysteresis <0,2
Compensated temperature range +20 - +80 °C
Zero point drift 50 ppm/K
Sensitivity drift 100
Working temperature range -10 - +90 °C
Zero point drift 100 ppm/K
Sensitivity drift 200
Storage temperature range -40 - +90 °C
1) #efinHtHons of directions designations “V
”and “A” in FVand
FA are given in Section 2.5.1 Coordinate System.
Pressductor Systemh
2) Fmax and FVmax are allowed at the same time.
3) Max. permitted load for the load cell is 10 × Fnom. The
overload capacity for the total installation may be limited by
the screws.
Repeatability error
Repeatability error is defined as the maximum deviation between repeated readings under identical
conditions. It is expressed as a percentage of the sensitivity at nominal load.
Compensated temperature range
The temperature drifts of the load cell have been compensated for in certain temperature
ranges. That is the temperature range within which the specHfied permitted temperature drifts (i.e.
zero point and sensitivity drifts) of the load cell are maintained.
Working temperature range
Working temperature range is the temperature range within which the load cell can operate within
a specHfied accuracy. The maximum permitted temperature drifts (i.e. zero point and sensitivity
drifts) of the load cell are not necessarily maintained in the whole working temperature range.
Storage temperature range
Storage temperature range is the temperature range within which the load cell can be stored.
Zero point drift with temperature
Zero point drift is defined as the signal change with temperature, related to the sensitivity, when
there is zero load on the load cell.
Sensitivity drift with temperature
Sensitivity drift is defined as the signal change with temperature at nominal load, related to the sen sitivity, excluding the zero point drift.
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