Inovance MD330 User manual

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1
Tension Control Inverter
MD330
User Manual
V0.0

C.TY TNHH TỰ ĐỘNG HÓA VIỆT TRUNG 02413.281.181-0989.984.666
Website:
www.viet-trung.com.vn Đ/c: 194-Nguyễn Trãi-Võ Cường-TP.Bắc Ninh
2

C.TY TNHH TỰ ĐỘNG HÓA VIỆT TRUNG 02413.281.181-0989.984.666
Website: www.viet-trung.com.vn Đ/c: 194-Nguyễn Trãi-Võ Cường-TP.Bắc Ninh
3
Contents
Chapter 1 Overview ............................................................................ 1
Chapter 2 Tension Control Principles ............................................... 2
2.1 Schematic diagram for typical curling tension control............. 2
2.2 Tension control scheme .......................................................... 3
Chapter 3 Function Parameter Table ................................................ 8
Chapter 4 Parameter Description .................................................... 21
4.1 Selection of Control Mode .................................................... 21
4.2 Tension setting ..................................................................... 24
4.3 Curling radius calculation ..................................................... 26
4.4 Line speed input ................................................................... 30
4.5 Tension compensation .......................................................... 32
4.6 PID parameters .................................................................... 36
4.7 Auto roll alternation parameter ............................................. 38
4.8 Additional parameters........................................................... 39

C.TY TNHH TỰ ĐỘNG HÓA VIỆT TRUNG 02413.281.181-0989.984.666
Website:
www.viet-trung.com.vn Đ/c: 194-Nguyễn Trãi-Võ Cường-TP.Bắc Ninh
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C.TY TNHH TỰ ĐỘNG HÓA VIỆT TRUNG 02413.281.181-0989.984.666
Website: www.viet-trung.com.vn Đ/c: 194-Nguyễn Trãi-Võ Cường-TP.Bắc Ninh
5
Chapter 1 Overview
Chapter 1 Overview
This manual shall be used together with the MD320 User Manual.
This manual only describes the parts related to curling tension. Other
basic functions are described in MD320 User Manual.
When the tension control mode is set as inactive, the inverter has the
same functions are the MD320.
MD330 is used for curling control. It can automatically calculate the
curling radius and is able to realize constant tension when the curling
radius changes. To realize constant torque control in the applications
without curling radius change, MD320 inverter is recommended.
When the tension control mode is selected, the output frequency and
torque of the inverter will be automatically generated by the tension
control function, and the frequency source selection in group F0 will be
inactive.

C.TY TNHH TỰ ĐỘNG HÓA VIỆT TRUNG 02413.281.181-0989.984.666
Website: www.viet-trung.com.vn Đ/c: 194-Nguyễn Trãi-Võ Cường-TP.Bắc Ninh
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1

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Website: www.viet-trung.com.vn Đ/c: 194-Nguyễn Trãi-Võ Cường-TP.Bắc Ninh
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Chapter 2 Tension Control Principles
Chapter 2 Tension Control Principles
2.1 Schematic diagram for typical curling tension control
F
Carry-over pinch roll
Fig.1 without tension feedback
Wind up
F

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Carry-over pinch roll Float
Wind up
Fig.2 With float roll tension feedback
2

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Website: www.viet-trung.com.vn Đ/c: 194-Nguyễn Trãi-Võ Cường-TP.Bắc Ninh
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Chapter 2 Tension Control Principles
2.2 Tension control scheme
There are two ways for tension control: to control the output
torque of the motor and to control the rotation speed of the motor.
MD330 is designed with two tension control modes for the two
methods.
1. Open-loop torque control mode
Open loop means that there is no tension feedback signal, and the
inverter can realize the control through the output frequency or torque
only, which will not be affected if the inverter is in open loop vector
mode or close loop vector mode. The torque control mode means that
the inverter controls the motor’s torque rather than its frequency, and
the output frequency changes automatically following the speed of the
materials.
According to the formula F=T/R (where: F is the material tension, T
is the torque of the wind-up roll, R is the curling radius), if the torque of
the wind-up roll can be adjusted based on the change of the curling
radius, the tension of the materials can be controlled. This is the

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principle for tension control in open loop torque mode. The reason for
its feasibility is that the tension of the material is from the torque of the
wind-up roll only, and the torque of the wind-up roll is mainly imposed
on the materials.
The MD series inverter can correctly control the output torque of
the motor in closed loop vector mode (with speed sensor vector control).
However, to use this control mode, encoder must be installed (the
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