Siemens SIWAREX R Betriebsanleitung - Seite 19
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4
Service
4.1
Care and Maintenance
Load cells are principally maintenance-free. However, regular inspections with
checking of the force applications, pendulum limits, lift off and overload protections
increase the reliability. The inspections should also be carried out after serious
events such as thunderstorms, floods or earthquakes.
If signs of corrosion appear, these can be counteracted by suitable protective
coatings.
Accumulation of dirt in the vicinity of a load cell should not be tolerated.
When cleaning with a high-pressure water jet, the jet may not be directed at the
cable gland or other sealing elements.
4.2
Troubleshooting
If errors or wrong measuring results occur which can be traced to the load cells,
the following points should be checked:
•
Are there parallel forces, e.g. due to cables, pipes or guides which exert force
in measuring direction?
•
Are there any other disturbances caused by soiling or thermal expansion?
•
Are all the load cells aligned correctly horizontally and at the same height?
•
Has moisture penetrated the junction box?
•
Are the cables connected correctly?
•
Are cables damaged?
A defective load cell of a weighing system can be localized by corner loading or
disconnection of the individual load cells. To check load cells for a defect, the
following measurements are necessary:
Zero signal:
•
Remove load completely from the load cell to be tested.
•
Disconnect all load cells.
•
Supply the load cell to be tested with approx. 10V DC (weighing module or
external power supply).
•
Measure voltage between SIG+ and SIG-.
•
Divide measured voltage by the feed voltage.
The result must match the value in the data sheet.
SIWAREX R Load Cells Operating Manual
A5E00159640
19