Dancer position control (linear drive)
15
Application examples
15.4
L
15.4-1
EDS82EV903-1.0-11/2002
15.4 Dancer position control (linear drive)
The dancer position controls the material tension while the machine is running.
The example describes the synchronisation of material web speed v
2
to line
speed v
1
. This application requires an application-I/O.
l Internal process controller as position controller.
l Selection of the line speed v
1
via X3/1U.
l Actual dancer position value of dancer potentiometer via X3/2U.
l Setting-up speed via X3/E3 as JOG value.
l Dancer position controller switch off via X3/E4 (external) or internally via
Q
min
(C0017) and C0415/1 = 6.
l Basic settings.
l Motor parameter identification. (¶ 10.9-1)
l
If necessary, calibration of setpoints and actual values to process variables.
(¶ 10.16-1)
Code Settings IMPORTANT
No. Name Value Meaning
C0410 Digital signals source
1 JOG1/3 3 X3/E3 Setpoint setting
4 QSP 2 X3/E2 Quick stop activation
19 PCTRL1-OFF 4 X3/E4 Dancer position controller switch off
C0412 Analog signal source
1 Setpoint 1 (NSET1-N1) 1 X3/1U Line speed v
1
5 Act. process controller
value (PCTRL1-ACT)
4 X3/2U Actual dancer position value
C0037 JOG1 20.00 Fixed set-up speed v
1
for material guidance,
individually adjust able.
C0070 Process controller gain 1.00
Adaptation to process
C0071 Process controller
readjust me nt time
100
More information: ^ 10.10-1
C0072 Differential component
of process controller
0.0
C0074 Process controller
influence
10.0 %
C0105 Deceleration time QSP approx. 1 s E.g. as emergency stop function. The settings
must ensure braking of the controller to
standstill within a very short time. Check
whether the application needs an external
brake resistor.
C0145 Process controller
setpoint source
1 C0181 (PCTRL1-SET2)
C0181 Process controller
setpoint 2
(PCTRL1-SET2)
Value of
C0051
Position the dancer a s re quired, C0051 = read actual dancer
position value.
C0181 should not be set to “0”, because t he
position setpoint would be generated from the
mains setpoint.
C0239 Lowest frequency limit 0.00 Hz Direction of rotation cannot be changed via the
process controller.
C0238 Frequency precontrol 1 Precontrol (total setpoint + process controller)
Total setpoint (PCTRL1-SET3) = Main setpoint + additional
setpoint
Process controller has limited influence.
Functions used
Application-specific
configuration
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