1 determining limit positions, 2 monitoring the dancer position, 3 circumferential speed of the reel – Lenze 8400 TopLine User Manual
Page 1434: 4 additional torque for damping the dancer control, Determining limit positions 4, Monitoring the dancer position 4, Circumferential speed of the reel 4, Additional torque for damping the dancer control 4, 19 function library
19
Function library
19.1
Function blocks
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Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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19.1.36.1 Determining limit positions
Option 1: Parameterising the limit positions
• Enter the actual value where the material stored in the dancer reaches its minimum length as
upper limit position in
• Enterh the actual value where the material stored in the dancer reaches its maximum length as
lower limit position in
.
• If the dancer detection provides an inverse signal, the lower limit position can be greater than
the upper limit position.
Option 2: Defining the limit positions using the "teach-in" function
Alternatively to the direct setting of the limit values in the two parameters mentioned above, it is
possible to bring the dancer into the respective limit position and then transfer the current value
into the corresponding parameter by setting bWriteMaxPos bzw. bWriteMinPos to TRUE ("teach-in"
function).
19.1.36.2 Monitoring the dancer position
When the actual position value nPosIn_a reaches the current position setpoint nSetPos_a, the
bInSetPosition output is set to TRUE.
• A tolerance zone can be set in
for reaching the setpoint. when the actual dancer value
leaves this tolerance zone, the bInSetPosition output will only be reset to FALSE after the delay
time set in
has elapsed (switch off delayed).
• In
and
, reference values for the limit position monitoring can be set. If the
actual dancer value reaches the set reference value towards the limit position, the
corresponding (bPosOverrange output or bNegOverrange) output is set to TRUE (switch-off
delayed) after the delay time set in
has elapsed.
19.1.36.3 Circumferential speed of the reel
If the storage of the dancer is set in
, the additional speed of the material resulting from
the motion of the dancer is provided at the nVAdditive_a output. When being added to the nVLine_a
material speed, it results in the current circumferential speed of the reel via the nVOut_a output.
• The storage results from e.g. twice the distance between the two limit positions multiplied by
the number of material wraps.
• The line speed is determined via wVMax and nVLine_a.
• In order to suppress the natural "noise" of the actual value signal with regard to the effect on
the additional speed, the additional speed passes through a filter. The time constant of the filter
can be set in
.
19.1.36.4 Additional torque for damping the dancer control
If the storage of the dancer is set in
, an additional feedforward control torque
nMAdditive_a can be generated for damping the dancer control.
• The feedforward control torque is derived from the negated additional speed (double dancer
speed) evaluated with the damping factor set in C01468/1.
• In order to suppress the natural "noise" of the actual value signal with regard to the effect on
the additional torque, the additional speed passes through a dead band component in addition
to the filter. The dead band area can be set in