Veichi AC90 Manual page 3

Foreword
Thanks for using AC90 tension control frequency inverter produced by Shenzhen Veichi Electric Co.,Ltd..
AC90 tension control frequency inverter is is a special high-performance vector tension control inverter developed by
our company recently. It adopts advanced torque mode open loop tension control technology. It is not only an
international leader in motor control performance, it also combines tension control industry characteristics, which further
strengthened the product reliability, stability and ease of debugging, can to better meet the demand in the field of
tension control.
This product is to keep constant tension by the output torque control and automatic roll diameter calculation. The
system does not need to install a tension sensor, no need to feedback of the external signal of the current position, or
the tension. It is able to complete the tension control even without need to install speed feedback rotary encoder in most
applications.
To meet the needs of different customers, the product provides two basic control modes. Control modes including:
1: Speed control mode
Inverter controls the speed of the motor by controlling the output frequency. The output torque of the motor is decided
by the load side, but will be limited in the maximum output torque. It is applicable to all types of speed purposes.
2: Torque control mode
The target of the inverter is to control the motor output torque. The motor speed is decided by the load side, but will be
limited in the setting frequency. In this mode, the user can set the tension value, and make tension open-loop control
coming true through the inverter diameter calculation function.
In tension open-loop control, roll diameter calculation is a very important part. Inverter has three roll diameter
calculation methods:
A: Linear speed method.


r

v
k

k
v
means linear speed of traction side; means The angular velocity of the rotation of the motor; means
r
mechanical reduction ratio; means winding roll diameter.
B: Thickness calculation method.
Accumulate the diameter according to the material thickness and cycles of the roll rotation to gain the roll diameter.
C: Time calculation method
Time integral method needs the time from empty roll to full roll, torque for empty roll and torque for full roll. Inverter will
increase torque giving value according to the change of the roll diameter and time.
AC90 tension control inverter can completely replace the torque motors, DC motors, tension controller and be
independent tension control system, which makes the control system more concise, easier to maintain and with better
tension control performance. It is suitable for application to paper, paper processing, printing and dyeing, packaging,
wire and cable, optical fiber cable, adhesive tapes, textile, leather, metal foil processing, fibers, rubber and other
industries.