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Constant tension center winder
For absolutely jerk-free winding
Drive application: Constant tension center winder
In many industrial sectors, such as the paper, plastics,
textile or sheet metal industries, materials in continuous,
flexible strip form (web) must be unwound or rewound before
and after processing. To prevent the material from tearing,
winding must be absolutely jerk-free and the tension must be
kept constant.
This constant tension central winder has an unwinder with
two drives: one for the take-up roller and one for the
pull-off roller. Usually, the pull-off roller operates with
speed control, in which case the material is unwound at a
constant web speed. The winder determines the tensile force,
while the speed signal from the pull-off roller functions as
a control signal. In many applications, a drive is not
required for the pull-off roller. It can be replaced by a
master encoder that delivers the master signal for the
winder.
The solution with MOVIDRIVE®
Set parameters instead of programming
SEW offers the “Central Winder” application module as
the comfortable solution for your drive task. This
application module is a component of the MOVIDRIVE®
application software MOVITOOLS® MotionStudio.
The user-friendly interface guides you through the process
of setting the parameters. Only those parameters required
for the specific application, such as fixed diameter and
tension, must be entered. The application module uses this
information to create the control program and loads it into
the inverter. MOVIDRIVE® then takes over the
entire motion control.
This saves a substantial amount of time in the startup
process, and as everyone knows: Time is money.
Extensive range of functions
The functions of the "Central Winder" application
module are divided into four areas:
- Calculation of the roller diameter
- Calculation of the tensile force
- Adjustable winding curve
- Either terminal or fieldbus control
Calculation of the tensile force
The tensile force must be adjusted very accurately for
flawless operation of the winding machine. To achieve this,
the following parameters must be taken into account:
Calculation of the roller diameter
Many winding machines measure winding diameter to determine
and set the correct winding speed. In this case, the
diameter does not need to be measured. The diameter is
calculated by the IPOSplus® program in MOVIDRIVE®.
Wide range of functions
No matter how large the variety of applications for constant
tension central winders, the wide range of functions
provided by the application module offers the right solution
for every task.
- Choice of fieldbus or terminal control
- Web speed and current diameter displayed
- Counter for material length
- Monitoring material tearing
Diagnostics included
During operation, all of the important data is displayed on
the central winder monitor.
Adjustable winding curve
With many materials, it is necessary to reduce the tensile
stress as the winding diameter increases. This can be
regulated using the central winder application module. You
can set the winding characteristics to your requirements
using a user-friendly editor. This is done either in a
freely defined fashion with a table or using a hyperbolic
function.
The advantages at a glance
- User-friendly user interface.
- Only the parameters needed for the application must be
entered.
- Guided parameter setting process instead of
complicated programming.
- The winding diameter is calculated independently in
MOVIDRIVE®. No additional measuring
equipment is required.
- All movement control is carried out by the IPOSplus®
program in MOVIDRIVE®.
- Material tearing is recognized automatically and the
threading help started.
- Simple integration into higher-level control systems
via fieldbus.
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