ABB TPPB-02 Control I/O Unit
Nominal load (rated capacity) kN 0.5 1.0 0.5 1.0 2.0 5.0
lb. 112 225 112 225 450 1125
Extended load 1 kN 0.75 1.5 0.75 1.5 3.0 7.5
lb. 169 337 169 337 675 1687
Overload capacity 2 kN 2.5 5.0 2.5 5.0 10.0 25.0
Measurement direction lb. 562 1125 562 1125 2250 5625
Transverse to measurement kN 2.5 3.0 1.25 2.5 5.0 10.0
direction lb. 562 674 281 562 1125 2250
Axial kN 2.5 5.0 2.5 5.0 10.0 25.0
lb. 562 1125 562 1125 2250 5625
Spring constant kN 50 100 50 100 200 500
1000 lb./in. 286 572 286 572 1143 2858
Deflection 3 mm 0.01 0.01 0.01 0.01 0.01 0.01
1/1000 in. 0.4 0.4 0.4 0.4 0.4 0.4
All load cells
Operating principle Electromagnetic
Pressductor technology
Accuracy class 4 % ±0.5
Repeatability error % <±0.1
Operating range 30:1
Stainless steel SIS 2387 5
DIN X4CrNiMo165
Working temperature range –10 to 80 °C
14 to 176 °F
Zero point drift 6 %/°C <±0.015
%/°F <±0.008
Sensitivity drift 6 %/°C <±0.015
%/°F <±0.008

PRT load cells work well with both rotating (live)
and non-rotating (dead) shafts. For live shaft
applications, many different bearing types and
sizes can be used. The load cell and the shaft can be
integrated by first press-fitting the selected bearing
onto the shaft and then sliding the assembly into
the center hole of the PRT load cell. Or, alternatively,
the roll shaft may be machined to create a shoulder
that one side of the bearing rests against,
while the other side is restricted by a snap ring.
In live shaft assemblies, the roll is held securely
in place by snap rings installed in grooves on each
side of the bearing in the center hole of the load cell.
Thermal expansion of the roll is accommodated by
installing snap rings on both sides of the bearing
in just one load cell.
The table presents a sampling of bearing
specifications for PRT load cells for various shaft
diameters and bearing types. Other bearing types
and sizes can be accommodated, including both
conventional SKF bearings and many self-locking
Torrington-type bearings.
The table includes typical examples of bearings
for a variety of shaft diameters, based on specific
load cell capacities, center hole diameters, and
bearing widths (distance between snap rings).
Of course, bearing load and rotational speed are
also important specification criteria that must be
considered when selecting an appropriate bearing.
Only the bearings for the largest shaft diameters
that fit standard PRT load cells are shown;
many other options are available. ABB applications
engineers can provide assistance with bearing
selection.
Application hint
Thermal expansion of the roll is accommodated
by installing snap rings on both sides of the bearing
in just one load cell.