Lenze 8615E - Manual (Page 107)

The controller divides the by the actual winding
diameter. The either be provided by a JOG
value, an analog input terminal X8, or by the digital frequency input
X5. When
the operating mode, also the operating unit or
one of the LECOM are available.
This procedure allows a of the circumferential
of the bale to the line That means that the field
frequency is high for diameters and low for large diameters.
9.2.2 Dancer-Position controller
The dancer has the following tasks:
l
Generation of the tensile stress of the material by means of a
weight or
cylinder.
l
of eccentricities in the bale by the
rnobility of the dancer.
l
actual is detected via a (Potentiometer or
non-contact System).
The dancer-Position controller is a closed-loop control of the line
lt compensates all deviations of the control channel
and the motor depend on the load.
9.3 Loop or dancer-Position control for line drives
An example of loop or dancer-Position control is the drive of two
conveyor belts
transport material. The material forms a loop
between the two conveyor belts or a dancer cylinder.
The dancer or the loop is in that way that the of
the is kept and thus the of the two conveyor
belts are synchronized
For this purpose, the corrected dancer is multiplied by the
value of the digital frequency. The of this is
added to the value of the digital frequency. For information
see 9.14.
9.4 Grinding or cutting-off wheel drives
If of the wheel has to remain in spite
of the motor has to be adjusted reciprocally to the
wheel diameter. Therefore, the actual wheel has to be
detected by a Sensor. The generated value is transmitted
to the controller adjusts the drive to a For
this purpose, the dancer-Position control has to be switched off
internally.
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