2 dancer-position controller, 3 loop or dancer-position control for line drives, 4 grinding or cutting-off wheel drives – Lenze 8615E User 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.
105