Inovance MD330 Manuel utilisateur
Tension Control Inverter
MD330
User Manual
VER:0.0
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 ....................................................7
Chapter 4 Parameter Description .......................................................20
4.1 Selection of Control Mode ....................................................20
4.2 Tension setting ..................................................................... 23
4.3 Curling radius calculation .....................................................25
4.4 Line speed input ...................................................................30
4.5 Tension compensation.......................................................... 32
4.6 PID parameters ....................................................................35
4.7 Auto roll alternation parameter .............................................38
4.8 Additional parameters...........................................................39
Chapter 1 Overview
1
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.
Chapter 2 Tension Control Principles
2
Chapter 2 Tension Control Principles
2.1 Schematic diagram for typical curling tension control
Float
F
Carry-over pinch roll
Wind up
Fig.2 With float roll tension feedback
Wind up
F
Carry-over pinch roll
Fig.1 without tension feedback
Chapter 2 Tension Control Principles
3
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 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
inverter shall be equipped with PG card).
2. Function modules related to open loop torque mode
Chapter 2 Tension Control Principles
4
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 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 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
Chapter 2 Tension Control Principles
5
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 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.
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:
Chapter 2 Tension Control Principles
6
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 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 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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