Commissioning
7.3 Commissioning via Quick Start routine
SIWAREX WT241
Manual, 05/2015, A5E36046748A 47
7.3.1.3 Pulse constant calculation
To calculate the pulse constant, use submenu "1.2.1.1 Pulse constant calculation".
Figure 7-5 Pulse constant calibration
For this procedure you require an optical marking on the belt, e.g. using chalk or adhesive
tape.
Start the measurement when the marking has passed a defined point. Stop the
measurement as soon as the belt has carried out the defined number of revolutions and the
marking has passed the defined point for the last time.
The determined values are displayed in the right-hand column underneath "New value".
Import the values using the "Apply new constant" button. This procedure permits highly exact
determination of any unknown pulse constants on the condition that the total belt length is
specified exactly.
As an alternative to the belt marking and manual sending of commands, you can connect a
belt revolution sensor (e.g. a proximity switch) to digital input DI.1. When assigning the
parameters for the digital inputs, you must then assign the "Trigger belt revolution recording"
function to DI.1. Pulses are then counted at input DI.1 according to the parameterized
number of belt revolutions. The result of the measurement is output when the revolutions
have been completed. Import the result using the "Apply new constant" button.
If the values have been applied successfully, the "Pulse / length unit" parameter underneath
"New value" becomes zero.
Then move on to the "Zero calibration" using → Zero calibration (Page 52).
7.3.2 Commissioning without speed sensor
You can define a known, constant speed or calculate the current belt speed. In addition, a
speed can be defined externally using data record 19.
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