With the continuous development of China's industrialization, wire drawing machines have played an indispensable role in wire processing, especially in industries such as steel wire, copper wire, plastics, bamboo chopsticks, wood, and wire and cable. Wire drawing machines can be classified according to their application into metal wire drawing machines, plastic wire drawing machines, and bamboo and wood wire drawing machines. Among them, the inline wire drawing machine is the main production equipment for metal processing. It can cold draw steel wire to the required specifications in one pass, has high working efficiency, and a small footprint . It is a common and relatively advanced type, but it places higher demands on the synchronization and dynamic response speed of the motor, making it the most difficult type of wire drawing machine to control. Below, we will introduce the application of the ENE EN700 series intelligent frequency converter CANopen bus networking on an inline wire drawing machine.
Photos from the scene
Process Introduction
Inline wire drawing machines are common metal wire processing equipment, mainly used for drawing and processing materials such as steel wire, copper wire, alloy wire, and welding wire. They consist of three sections: unwinding, drawing, and take-up. Detailed descriptions are as follows: Unwinding Section: The material to be processed is fed into the drawing section. At this stage, the wire can withstand significant tension, so a passive unwinding method is used. This requires the motor to have high torque during startup and low-speed operation, and a stable operating speed . Drawing Section: Here, the wire is drawn stage by stage ( 13 stages in total), with each stage driven by a variable frequency motor driven by a frequency converter. In this process, the frequency converter must be reliable, ensuring high motor speed accuracy, fast dynamic response, and constant wire tension to prevent wire breakage and loosening, thus guaranteeing the quality of the finished product. Take-up Section: The processed wire is wound onto a reel. Whether accelerating during startup, decelerating during shutdown, or operating at a constant speed, the winding speed must be synchronized with the motor speed in the drawing section to ensure a stable winding effect.
System Configuration
The field equipment system uses CANopen bus communication for operation. Each set of equipment is equipped with 17 ENERGY EN700 series intelligent frequency converters. In the wire drawing section, each stage is driven by one frequency converter to drive one frequency conversion motor. Each frequency converter is equipped with an expansion card and connected to the motor encoder to form a closed-loop vector control.
flow chart
Wiring diagram
Parameter settings
Application advantages
■ The use of EN700 series frequency converters makes the system more precise, ensuring synchronous operation of the equipment, with a speed stability accuracy within 0.1% of the rated synchronous speed.
■ Equipped with closed-loop vector control comparable to imported frequency converters, ensuring 180% rated torque output of the motor during low-speed operation.
■ The equipment adopts CANopen bus for multi-unit network communication, with a response time in the millisecond range, ensuring uninterrupted operation during equipment start-up and shutdown, and guaranteeing stable equipment operation.
■ Achieved high-speed production of 25m/s , improving equipment production efficiency.
