Tension Control with a Load Cell
Tension control with a load cell component for R2R systems
Description
Connections
Parameters
The Tension Control with a Load Cell component is a tension controller which calculates a local web speed to control the tension. Internally a LimPID component is used.
Usage
The Tension Control with a Load Cell component needs a reference tension signal and a measured tension signal which must be controlled. The measured tension can be gotten from the tension output port of a Span component as well as from a Load Cell component. The output of the controller is an offset for the defined speed of the web line,
vlocal=vweb+vPID
Parameterization
The user has access to all parameters from the LimPID component. Additionally, it is important to define the working direction of the Tension Control with a Load Cell component. For this it is important to define the order of the drive and the sensor position in machine direction.
Name
Modelica ID
TRef
Real input; reference tension
T_ref
TMeas
Real input; measured tension
T_meas
vweb
Real input; master speed
v_web
vlocal
Real output; local reference web speed
v_local
Settings
Default
Units
Order
Sensor-Drive
Order of machine direction
BDir
Controller
Controller Type
PI
Type of controller: P, PI, PD, PID
controllerType
k
0.001
Gain of controller
Ti
0.5
s
Time constant of integrator block [1]
Ni
0.9
Ni⁢Ti is the time constant of anti-windup compensation [1]
Td
0.1
Time constant of derivative block [2]
Nd
10
The higher Nd, the more ideal the derivative block [2]
wp
1
Weight for proportional block
wd
0
Weight for derivative block [2]
vmax
ms
Upper limit of output velocity
v_max
vmin
−0.1
Lower limit of output velocity
v_min
[1] Accessible when controllerType∈PI,PID
[2] Accessible when controllerType∈PD,PID
Initialization
Initial Values
NoInit
Type of initialization: NoInit, SteadyState, InitialState, InitialOutput
initType
xi start
Initial value for integrator state
xi_start
xd start
Initial value for state of differentiator
xd_start
I/O Units
Value
TUnit
N
Unit selection for the TRef and TMeas inputs
forceUnits
vUnit
Unit selection for the vweb and vlocal inputs
velocityUnits
See Also
Controls
Web Handling Library
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