Inovance MD330 User manual

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1
Tension Control Inverter
MD330
User Manual
V0.0

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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

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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.

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1

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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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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
3

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Chapter 2 Tension Control Principles
inverter shall be equipped with PG card).
2. Function modules related to open loop torque mode
1) Tension setting part: It is used to the set the tension. In practice,
the set value of the tension shall correspond to the actual situations,
such as the materials used and the curling requirements. The
relevant value shall be set by the user. The tension taper can
control the tension to decrease with the increase of the curling
radius, so as to improve the curling effect.
2) Curling radius calculation part: It is used to calculate or acquire the
curling radius information. If line speed is used to calculate the
curling radius, the line speed input function part is needed. If
thickness accumulation is used to calculate the curling radius, the
relevant function part for calculating curling radius with thickness
accumulation shall be used.
3) Torque compensation part: Part of the output torque of the motor
will be used to overcome the rotation inertia of the
wind-up/roll-down roll during the acceleration/deceleration. The
inertia compensation part of the inverter can be automatically
compensated automatically according to the

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acceleration/deceleration rate through proper parameter setting, so
that the system can still have stable tension during the
acceleration/deceleration. The friction compensation can eliminate
the influence of the system resisting force over the tension.
3. Close-loop speed control mode
Close loop means that the tension (position) detection feedback
4

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Chapter 2 Tension Control Principles
signal forms a close loop for adjustment. Speed control mode means
that the inverter realizes the control by adjusting the output frequency
according to the feedback signal. The inverter under speed mode can
operate in any of the following three modes: speed sensorless vector
control, speed sensor vector control, and V/F control.
The principle for the control mode is as follows: calculate a set
value for the matching frequency, f1, according to the material line
speed and the actual curling radius, conduct PID operation through the
tension (position) detection signal to generate a frequency adjustment
value f2, and then output the final frequency f=f1+f2. f1 can basically
match the line speed of the wind-up/roll-down roll with the material line
speed, and then the control requirement can be met with the slight
adjustment of f2. In this way, the problem between the response
quickness and the control stability in close-loop control can be well
solved.
In this mode, the tension setting part is inactive, and the target
value of the system control is set in the FA-00PID reference source.
The control result is that the tension (position) feedback signal will be
the reference value of the PID. It should be noted that when using the

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position signal (e.g. tension swing, float roll) as the feedback, the actual
tension may not be changed by changing the set value (PID reference
value). The mechanical configuration, such as the counterweight of the
tension swing or float roll, shall be changed to change the tension.
5

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Chapter 2 Tension Control Principles
4. Function modules related to close loop speed mode
1) PID part: It is mainly used for setting of group FA. It can also
provide auxiliary function for the second group of PID parameters
in group FH. After all the other parts are correctly set, the PID
parameters shall be adjusted for the final control result.
2) Line speed input part: This part is very important. It has two
functions: to calculate the matching frequency according to the
line speed (as described above) and to calculate the curling radius
through the line speed.
3) Curling radius calculation part: It is used to calculate the actual
curling radius. The inverter can acquire the matching frequency
after obtaining the line speed and the actual curling radius. When
using the line speed to calculate the curling radius, if the curling
radius calculated by the inverter is different from the actual curling
radius, it indicates that there is deviation in the line speed input.
The line speed input can be corrected through the curling radius
calculation result. It should be noted that the matching frequency
calculated with the line speed and the curling radius is not the
actual output frequency of the inverter, while operating frequency

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used in calculating the curling radius with the line speed and
operating frequency is the actual output frequency of the inverter.
There is no contradiction in logic.
4） The second group PID parameter part: Only one group of PID
parameters is not sufficient for the whole process control. At this
time, the second group of PID parameters can be used. For
6

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Chapter 2 Tension Control Principles
example, during partial wind-up, the first group of PID parameters
can be used to achieve good control result; during full wind-up, the
second group of PID parameters can be used to achieve good
control result. In this way, good control result can be achieved in
the whole process.

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Chapter 3 Function Parameter Table
Chapter 3 Function Parameter Table
Function
code
Name Set range
Mini
mum
unit
Leave
factory
set value
Cha-
nge
Control mode selection
0: inactive
1: Open-loop
torque control
mode
2: Close-loop
speed control
FH-00 Tension
control mode
mode
3: Close-loop
torque control
mode
4: Constant line
speed control
mode
0: wind-up
1 0 ×
FH-01 Curling mode
1: roll-down 1 0 ○

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