Function Application
‑633‑
3.6.7 Constant Linear Speed Control
Different from preceding modes, this mode is applicable to scenarios where no
specific traction is used to directly control the material tension; instead, the winding
or unwinding machine runs at a constant linear speed and serves as the traction
motor, and the material tension is controlled by the winding/unwinding operation.
Figure 3‑74 Application of constant linear speed control
In the preceding figure, the winding machine serves as the traction motor. To make
the system run at a constant linear speed, the roll diameter must be calculated in
either of the following two modes:
1. Assign the DI terminal with the revolution count signal function to calculate the roll
diameter in thickness overlying mode based on revolution count signals.
2. Install a speed measuring device to measure the material linear speed and
calculate the roll diameter based on the measured linear speed. Update the target
frequency based on the target linear speed and current roll diameter to make the
system run at a constant linear speed.
Note: the preceding typical applications are only given to describe the applicable
scenarios of the four tension control modes. Other modes may be selected based on
the actual conditions if the basic conditions are met.
3.6.8 Application Restrictions
Table 3–40 Required conditions for tension control modes
Function/Restriction
Roll Diameter
Note 1
Linear Speed
Control Feedback
1. Tension open‑loop torque
control
Required Not required
Note 2
Not required
2. Tension closed‑loop speed
control
Required Required Required
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