VEGA WEIGHTRAC 31 Profibus PA - Manual (Page 44)

44
7 Setup with PACTware
WEIGHTRAC 31 • Profibus PA
43837-EN-131119
Process speed
The speed of the conveyor belt is important for the measuring result
of the sensor.
This function is selected as a standard feature. Hence the input can
be used for an external tachometer or a speed value from the control
room.
In this window you can carry out the settings for the speed of the
conveyor belt or the spiral conveyor.
Fig. 27: Select process speed
Input
If you have neither a tachometer on the conveyor belt nor the actual
belt speed from the plant control system, you should deactivate the
input of the process speed by selecting "No belt/spiral stop signal". In
such case you have to enter a fixed conveyor belt speed.
You can transmit the conveyor belt speed via an "Analogue input
(4 … 20 mA)" or a "Digital input (frequency input)". Tachometers are
designed mainly for digital input.
Here you have the possibility to process only one "Belt stop signal". In
this case you have to enter a fixed belt speed.
Scaling min./max.
If you have selected one of the inputs for the process speed, you can
determine here the min. and max. values for the input. Specify mA for
analogue input and Hz for digital input.
Unit - Belt/screw speed
Here you can select the unit of the conveyor belt speed (e.g. m/s, ft/
min etc.)
Process speed (step 3)