Lenze i950 - Dancer Control

7.10 Dancer control
The feedforward control takes place via the line speed signal, which is mulplied
by the reciprocal value of the actual diameter.
In the case of the dancer control, the drive is operated in speed control mode. The dancer
posion is recorded and compared to the setpoint posion. If a deviaon is detected, the
dancer control corrects the speed setpoint.
The dancer control has a classic PI structure. The control is enabled by seng bit 18 of the
control word. 40x5050:010 Bit 18
As long as bit 18 = FALSE, the system deviaon remains 0 and the ramp generator for the
dancer posion setpoint is also loaded with the starng value 0.
In the case of a highly quansed actual dancer posion, PT1 ltering can have a posive eect
on the stability of the control loop. If high dynamic performance is required, dead mes in the
control loop must be avoided. The lter me can be opmised in the parameter PT1 lter
me dancer posion. 40x5052:188
The correcng variable of the PI controller is fed via a limiter, which makes it possible to set
limits via the parameters Dancer control upper output limit and Dancer control lower output
limit.
Parameters for the dancer control:
•
Dancer control upper output limit 40x5052:183
•
Dancer control lower output limit 40x5052:184
The
correcng variable has an addive eect on the main speed path setpoint. The inuence
of the parameter Eecve dancer control inuence has a mulplicave eect on the correct-
ing variable of the PI controller and denes the correcon value’s maximum permied eect.
40x5052:176
+
-
0
0x5052:188
0x5052:181
0x5052:182
0x5052:183
0x5052:184
0x5052:189
0x5052:180
0x5050:010, Bit 20
0x5050:010, Bit 20
0x5052:176 0:5051:012
0x5052:192
0x5050:110, Bit 17
+
+
0x5050:010, Bit 28
0x5051:009
0x5051:033
1
d ´p
Valid dancer set position
Dancer pos valueition: raw
Dancer: PT1 filter time
Dancer control: Gain
Dancer control: Reset time
DancerCtrl: Upper output limit
DancerCtrl: Lower output limit
Start value
Dacer act poistion. filtered
unwind
rewind
reset
Dancer control
Dancer set position ramp
Enable dancer control
Reset I-component
Valid dancer ctrl influence.
Reference line velocity
Status Bit, Unwind
operation
Material feeding from above
from below
from top
Actual line velocity
Resulting speed set value
DancerCtrl: Current output
0x5052:179
0x5052:190
Fig. 52: Dancer control signal ow
Parameter
Address Name / seng range / [default seng] Info
0x5050:012 Set velocity (control word 2)
0.0000 ... [0.0000] ... 214748.3647 mm/
s
The value of the external line speed setpoint value is specied in [mm/s].
It has 4 decimal posions.
Conguring the "Winder Dancer" TA
Dancer c
ontrol
129