Siemens SIWAREX WT241 Manual page 49

7.3.2.2 Determination of current belt speed (belt empty)
In menu item 1.1.2 set the "Speed detection" parameter to "Preset/Detect constant speed".
Subsequently move on to menu item 1.2.1.2 "Speed calibration - No sensor, Belt empty".
The belt must have a clearly visible marking, e.g. using chalk or adhesive tape.
Figure 7-7
Execute the "Start calibration" command when the belt marking passes a defined point. Stop
the calibration 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 belt speed is subsequently
displayed in the "New value" column. You can import the belt speed using the "Apply new
speed" button.
Activate the specified speed using one of the three options by means of the external "Set
"Belt is running"" command:
● Via a correspondingly parameterized digital input
● Via an external controller
● From the operator panel (menu 1.4.5)
You can reset the speed to zero again using the "Reset "Belt is running"" command.
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, and an exact trigger point is thus achieved.
Then move on to the "Zero calibration" using → Zero calibration (Page 52).
7.3.2.3 Determination of current belt speed (belt loaded)
In addition to the speed calculation with empty belt, a further calculation can be carried out
with the belt loaded. In this case the characteristic of the motor with load is recorded.
SIWAREX WT241
Manual, 05/2015, A5E36046748A
Speed calculation with empty belt
7.3 Commissioning via Quick Start routine
Commissioning
49