Program features 131
Example
The drive runs a conveyor line. It is speed controlled but the line tension also needs
to be taken into account: If the measured tension exceeds the tension setpoint, the
speed will be slightly decreased, and vice versa.
To accomplish the desired speed correction, the user
• activates the trimming function and connects the tension setpoint and the
measured tension to it.
• tunes the trimming to a suitable level.
Add
Tension
measurement
Tension
setpoint
Trimmed speed
reference
PID
Speed controlled conveyor line
Simplified block diagram
Tension measurement
Drive rollers (pull)
Speed reference
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