Minebea Intec PR 6207, Installation Manual

Page: 8 / 46

3 Recommendations for installation
3.1 Load cell and constrainer arrangement
Examples:
- The supporting construction of the scale (and thus the load cells) and the vessel must
be stable enough to withstand the speciied loads, horizontal (check with spirit level!)
and lat.
- Vessels should preferably be suspended by 3 load cells (see igure).
This minimizes the interference between pendulum movement and rotation and
ensures uniform load distribution.
- Suspensions in weighing installations with more than 3 load cells are statically
indeterminate and should be avoided!
- The center of gravity of the weighing object must be lower than the suspension
points.
- Suspensions on the long cable (or similar) reduce the potential diagonal pull.
- The suspension points must be on the same level to ensure uniform load distribution.
- The output signal of the load cells (with dead load) must be equal.
- The load cell base must be horizontal, lat, and clean.
- Transverse and/or horizontal forces and torques exceeding the permissible limits are
disturbances which can generate measuring errors and, in the worst case, may
damage the load cell.
- If the object to be measured is constrained properly, damage and measuring errors
can be prevented without afecting the required space for movement in the direction
of the measurement.
Consideration should be given to the fact that thermal expansion and contractions
may constrict the required space for movement of the object to be weighed and
could thereby lead to signiicant falsiication of the measuring results.
Therefore, special attention should be paid to the design, arrangement, and
condition of the constrainers.
- A suspension on 3 or 4 load cells with a relatively short pendulum length can do
without constraining and merely have a horizontal boundary.
This is particularly true when hardly any transverse forces occur, the center of gravity
of the object is lower than the suspension point, and/or when horizontally routed
Beam Type Load Cell PR 6207 3 Recommendations for installation
EN-6 Minebea Intec