U Page 30
Digital controller RK 4004
.1.4. dual-rate width
:
50 %
.1.5. dual-rate level
:
70 %
Window width = 10.0 mm * 50 % / 100
=
5 mm
Reduced pos. velocity = 20 mm/s * 70 % / 100
=
14 mm/s
Within ±5 mm of the set web position a web error is corrected at a
maximum motion speed of 14 mm/s.
.1.6. velocity auto
The greater the set maximum positioning velocity is given a constant
proportional range (parameter ".1.3. prop range ±"), the greater the
amplification of the web guider will be in automatic mode.
Positioning velocity
.1.6. velocity auto
15 mm/s
20 mm/s
Proportional range
.1.3. prop range ±
2.0
Control deviation of
1.5 mm
Set position
(Sensor measuring range
center )
established correction
velocity depending on
the positioning velocity
Correction
velocity
Control deviation
15 mm/s
11 mm/s
By increasing the maximum positioning velocity the characteristic
curve becomes steeper (see fig.). The steeper the characteristic cur-
ve the greater the positioning velocity will be given a control deviation
and the more sensitive the system will become. The positioning
velocity with which the actuator tries to correct the error may be de-
duced from the characteristic curve.
