ABB PFEA 112 - Mounting the Load Cells

Tension Electronics PFEA111/112, User Manual
Appendix E PFTL 101 - Designing the Load Cell Installation
E-8 3BSE029380R0101 Rev C
E.7 Mounting the Load Cells
The instructions below apply to a typical mounting arrangement. Variations are allowed,
provided that the requirements of Section E.4, Installation Requirements are complied with.
If it is necessary to use tubular dowel pins to secure the position of the load cell,
see instructions in Figure E-3.
1. Clean the foundation and other mounting surfaces.
2. Fit the lower adapter plate to the load cell.
Tighten the screws to the torque stated in Table E-1.
3. Fit the load cell and the lower adapter plate to the foundation,
but do not fully tighten the screws.
4. Fit the upper adapter plate to the load cell.
Tighten the screws to the torque stated in Table E-1.
5. Fit the bearing housing and the roll to the upper adapter plate,
but do not fully tighten the screws.
CAUTION
During this operation it is possible to over load the load cells if the operation is
done not careful enough, especially if the roll is heavy. The most critical load
cells are naturally the PFTL 101A-0.5 kN and PFTL 101B-2 kN. Applications
with inclined mounting are most critical.
6. Adjust the load cells so that they are in parallel with each other and in line with the axial
direction of the roll. Tighten the foundation screws, see Table E-1.
7. Adjust the roll so that it is at right angles to the longitudinal direction of the load cells.
Tighten the screws in the upper adapter plate, see Table E-1.
Table E-1. Tightening Torques for Load Cell PFTL 101
Alternative Type of screws
Strength
class
Type of
lubrication
Dimension
Tightening
torque
[Nm] ± 5%
1
(Recommended)
Alloyed steel screws
Strength class according to ISO 898/1
M12 136 Nm
12.9 Oil M16 333 Nm
M20 649 Nm
2
(Recommended)
Alloyed steel screws
Strength class according to ISO 898/1
M12 117 Nm
12.9 MoS
2
M16 286 Nm
M20 558 Nm
3
Stainless steel (A2-80) A2-80 M12 76 Nm
or acid resistant steel (A4-80), or Wax M16 187 Nm
Strength class according to ISO 3506 A4-80 M20 364 Nm
4
Stainless steel (A2-80) A2-80 Oil M12 65 Nm
or acid resistant steel (A4-80), or or M16 161 Nm
Strength class according to ISO 3506 A4-80 emulsion M20 313 Nm