Application Case - Delta Electronics

Application Case
Case Application of Delta’s AC Servo Drive Products in Extruder
Industrial Automation BU, Delta Electronics, Inc.
Issued by Solution Center Date February, 2010 Pages 2
Applicable to
DOP Series HMI, DTA Series Temperature Controller, VFD-B Series AC Motor Drive, VFD-E Series
AC Motor Drive, VFD-C2000 Series AC Motor Drive, DVP series PLC
The extrusion is a process used to create objects such as films, leather, plastic tubing and pipes. The process is that
the rubber materials are heated in cylinder and pushed by the screw ball. After forming to the desires shape, the
exudate is cooled and solidified through water or air. Therefore, during the operation, the extrusion equipment must
include extruder, tooling mechanism and take-off device. The system configuration which adopts Delta’s industrial
automation products is shown in the figure below:
When the heating rubber goes through the die head, it will generate back pressure. The absolute pressure value and
the changes of the pressure value can be measured. The users can adopt Delta’s DVP series high-resolution analog
module to control the pressure sensor on the die head and perform detection and calculation, and adjust motor speed,
and even change the pressure and back pressure of extruder so as to stable the running of the plastic materials in the die
head.
In order to solve the fluctuation problem, there are two control methods for controlling the speed of the take-off
device in the process of the extrusion. One is to measure the linear velocity of the product, and the other is to use a
contact wheel drive the encoder to contact with the product and generate a signal proportioned to linear velocity. After
inputting the PLC programs, it can control the speed to be more stable.
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Application Case
Industrial Automation BU, Delta Electronics, Inc.
When the open-collector type encoder is used, the converter is not needed. The channel of the high-speed counter
of Delta’s PLC can be connected directly for detecting the extrusion speed. When Delta’s PLC application instruction SPD
is used, the speed detection procedure can be easily recorded. In addition, Delta’s DVP-EH2 series or DVP-SV series
PLCs all provide built-in 200K high-speed counter which is able to detect up to 1200rpm speed.
The second controlling method uses the feedback measure system to measure the product size and the
compensation changes. Connecting the analog output signals of thickness gauge or diameter detector which is installed
near the take-off device to Delat’s PLC analog module, DVP04AD-S can feedback the output signals to take-off device and
extruder. Doing this is to compensate the speed of the take-off device and the output changes of extruder.
Regarding the winder equipment, Delta’s AC motor drive is used to control the closed-loop vector for constant tension
control and the encoder is used to feedback the signals to the AC motor drive. In the actual application, Delta’s AC motor
drive is applied to control the change of the winder diameter. To keep the constant tension, the motor drive will calculate
the winder diameter provided by the system and relevant parameters and and compensate the corresponding motor
torque according to the change of the actual winder diameter.
More information on Delta’s industrial automation products, visit our website at:
http://www.delta.com.tw/industrialautomation
品質至上 QUALITY
信賴第一 RELIABLITY
追求卓越 EXCELLENT