5.5
Electronic corner correction
5.5.1
General information
Load cells from Minebea Intec are manufactured according to high quality standards and
have very precisely balanced output values.
Nevertheless, mechanical imbalances may cause impermissibly large corner load errors,
which must be compensated for by soldering in resistors.
Note:
The soldering studs for the resistors are short-circuited at the factory.
The load cells must be correctly installed and precisely aligned in order to achieve good
measuring results and good results with corner loads. For this reason, if you notice a
corner load error, always check the installation and alignment of the load cell first.
If necessary, mechanically adjust the height (see load cell installation manual).
NOTICE
Loss of verification accuracy
Contact problems cause unstable signals. The consequences are wandering zero points
that lead to loss of verification accuracy.
Do not use a potentiometer.
Only use resistance values of 0
5.62
Ω
(1 %, P70 = 0.6 W) of size MBB0207
(approx. 2.5 × 6.5 mm) or CECC B.
5.5.2
Procedure
The corner load error can be minimized by selecting reference cell to be load cell with the
lowest displayed load.
The other load cells are adjusted to value displayed on the reference cell by additional
resistors at the input of the load cells.
The electronic corner correction makes it possible to reduce the sensitivity of each
separate load cell individually.
The following formula is used:
R
Resistivity added to the input circuit of the load cell
(the resistivity is normally <7
Ω
)
Weight
nom
Weight value in the display
Weight
target
Weight of applied load
R
LC
Input impedance of the load cell
Example:
Loaded piece
12,000 kg
Cable Junction Box PR 6130/68S
5 Cable connections
Minebea Intec
EN-18
