U Page 5
Digital controller RK 4004
1.5 Control structure with
constant controlling for
support beams
Control structure legend
1 Operating mode
2 Sensor
3 Counter
4 Web offset
5 Edge sensor position controller
6 Support beam speed controller
7 Power output stage
8 Sensor zero point detector
9 Memory for edge position
10 Park position
11 Support beam position controller
12 Actual speed value recording
13 Incremental encoder
14 Max. variable actuating speed in search for edge mode
15 Variable current controller
16 Current controller
17 Variable actuating speed during positioning
18 Oscillation generator
In a control structure for a support beam a set speed value is deter-
mined on the basis of the sensor signal via the P position controller
that is transmitted to the speed controller. The resulting set speed va-
lue is compared to the actual speed value and transmitted to the PI
speed controller. The latter emits a pulse width-modulated signal at
the output stage. In "search for edge" or "hybrid" modes the sensor is
driven to follow-up the web edge.
Available as proportional actuator:
Support beam VSS
