The processing objects of printing machinery include paper, cardboard, and film of various thicknesses, as well as thinner metal materials and other substrates. Printing equipment adopts various printing methods (convex, flat, concave, hole, special printing) according to the requirements of different printed matter, and accurately prints various colors in proportion to the specified positions on the substrate, thereby forming text, images, etc. Colorful colorful prints inside.
A. Process Flow
Printing machinery is mainly divided into four main parts: paper feeding, printing, drying and stacking. During the processing, it is necessary not only to ensure that the printing material moves according to the specified requirements, but also to complete the printing of various colors or the processing of the printing material while the printing material is traveling, thus resulting in the paper transfer movement of the printing machinery (paper feeder). ) and printing movement (printing device) two kinematic chains. VB VFD is mainly used in paper feeders to drag paper and complete the feeding process.
B. Control Requirements
Braking method: When the printing work is completed or various printing failures occur, it needs to stop quickly.
Start-up mode: When the printing device is turned on, the speed is relatively low. The feeder can only be started after the printing press is running.
Fixed speed mode; during operation, change the transmission speed of the paper feeder through the acceleration and deceleration buttons.
Data upload; the parameters of the frequency converter need to be converted by PLC and then uploaded to the host computer.
| Parameter | Description | Set Value | Remarks |
| F0.01 | Start/Stop Order Source | 1 | DI Terminal |
| F0.03 | Frequency Source | 1 | Keypad & DI Terminal（Memorable when Powered Off） |
| F0.18 | Acceleration Time | 1 | 1s |
| F0.19 | Deceleration Time | 1 | 1s |
| F1.11 | Beginning Frequency of DC Braking when Stopping | 30.00 | 30Hz |
| F1.12 | DC Braking Delay | 0 | 0s |
| F1.13 | DC Braking Current | 30 | 30% of VFD Rated Current |
| F1.14 | DC Braking Period | 1 | 1s |
| F5.00 | DI1 Option | 1 | FWD Run |
| F5.01 | DI2 Option | 6 | Accelerate |
| F5.02 | DI3 Option | 7 | Decelerate |
VB VFD uses DC braking to decelerate and stop. When the running frequency is 30HZ, the VFD feeds DC (30%) into the stator winding of the asynchronous motor to stop the motor quickly.
VB VFD adopts terminal start and stop option. Using the sign that the printing device has started up as the start signal for the paper feeder can improve the finished product efficiency of the printing machinery.
The VB VFD is equipped with a standard RS485 port. Through the MODBUS communication protocol, data can be uploaded to the PLC. The data can be converted by the PLC to control the printing machinery, which can contribute to the linkage between the paper feeder and the printing machinery.