DOL 535 • DOL 539
36
Technical Manual
Test of signal quality
Start by testing the signal quality. It takes 5 minutes.
The test provides the most accurate result, when the silo is not
affected by a running feed system or heavy winds.
Select the menu
Technical | Calibration | Production
|
Check silo signal quality
Check the test result in the menu. If the result is
Poor
or
Very
poor
, you cannot expect to receive correct data. Also, see the
In case of poor signal quality [
Start calibration
Start the calibration by selecting the menu
Technical | Calibra-
tion | Production
| Silo
and set
Calibrate/Set tare/Change
to
Calibrate.
Enter the current weight in the silo in
Calibration tare amount
.
Enter the weight available for the calibration (
Calibration load
amount
). The more weight that is available, the more precise
the calibration will be. Min. 100 kg.
Place the calibration weight on the silo.
Wait until it is stable.
The calibration state changes to:
Ready to end calibration.
Select
Calibrate/Set tare/Change
and select
Finish
.
If there is uncertainty about the silo content (
Calibration tare amount
), it can still be calibrated and the menus
continuously show how much of the feed is being used. However, the indication of the silo content may be incor-
rect.
It is possible to set the calibration tare amount at a different time when you know the exact contents of the silo.
You do not have to use calibration weights for calibration and subsequently correct the entry; instead you set
Calibrate/Set tare
to
Set tare
and the known silo weight is entered at .
4.4.1 In case of poor signal quality
The following conditions may contribute to poor signal quality:
• The cables from the load cells are too long.
• The cables are not adequately shielded.
• The cables are placed too close to power cables.
• Poor connection in terminal box.
• Load cells are not grounded.
• Poor mechanical mounting of silo.
• Poor load cell quality.
• Bad weather conditions (wind).
