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Edition 06/2009
As long as the assembly work on the scales has not been completed, the load cells
should be replaced by dummies to protect them against impact or welding currents.
CAUTION
If welding should be necessary after load cells have been installed, make
absolutely sure that the welding current is not conducted through the load cell.
The ground clamp of the welding gear should be attached directly next to the
welding point with a safe contact. The load cells must be bridged with the
grounding cable. The individual load cells must be disconnected.
Load cells may not be overloaded. The load carrier should be set down slowly. IN
load cells with low rated loads in particular there is a danger that the load cell body
could be distorted by application of force, e.g. tightening lock nuts.
WARNING
The bearing is statically indefinite in the case of more than three load cells or
application points. The force application points should be at the same height. The
output signals of all load cells should be approximately the same at even load or
correspond to the load distribution in the case of uneven load. Proceed as follows
to measure the load on the load cells:
•
Disconnect load cell cables SIG+ and SIG-.
•
Supply load cells with the feed voltage (e.g. 10.2V).
•
Measure the output voltages between SIG+ and SIG- of the individual load
cells.
The measured voltage corresponds in proportion to the product of
characteristic value times supply voltage to the weight percentage at the
rated load which is applied to the load cell.
Example:
Calculation: 4mV / (10,2V x 2mV/V) = 0.196
Result:
Spacer plates should be placed beneath the load cell with the lowest value until the
output voltages are adjusted equally.
The load cell seat must be horizontal, completely level and, like the load cell base,
absolutely clean.
The contact surfaces of the force applications must be lubricated with high-
performance grease.
SIWAREX R Load Cells Operating Manual
A5E00159640
Suitable lifting gear must be used for lifting the load carrier. The
appropriate safety regulations must be observed.
feed voltage
characteristic value
rated load
output voltage
0.196 x 5t = 0.98t
The load cell is loaded with 0.98t
Installation/Assembly
U
10.2V
s
C
2mV/V
n
E
5t
max
U
4mV
a
14
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