I. Electric transmission control

•  Public DC bus-bar control characteristics

1)  Shared DC bus-bar and shared brake units can significantly reduce the reconfiguration of rectifiers and brake units. The structure is simple and reasonable, and it is economical and reliable.

2)  Constant median DC voltage of shared DC bus-bar, and large parallel capacitor storage capacity.

3)  Complimentary energy feedback under different statuses of operating motors optimises the dynamic characteristics of the system.

4)  Improves system power factors and reduces grid harmonic currents, raising the system’s energy usage efficiency.

5)  Widely used in the energy feedback breaks for PWM exchange transmission with highly efficient energy conservation.

6)   Does not generate any abnormal high-level harmonic current constituents, making it green and environment-friendly. Power factor ≈1

7)   In the multi-motor transmission system, every single motor is able to adequately utilise renewable energy.

8)   Energy-saving investment which facilitates the control of grid harmonic and reactive components.

Basic functions of paper machine transmission control

1)  Speed reference

2)  Logic control

3)  Load distribution speed / torque control

4)  Speed chain control

5)  Speed change rate control

6)  Tension control power

7)  Torque control

8)  Transmission control and auxiliary electricity link

9)   Auto diagnosis alarm

10) Remote messaging

II. Winder transmission control functions

Electric structure of winder

The electric control cabinetsand pneumatic control cabinetsare controlled and programmed together by the DCS and communicate with the whole machine as an integrated unit. The components include the control platform, motor photoelectric encoder, tension sensor, safety switch, limit switch, paper breaking signal switch, alarm device, and the pneumatic pipeline. Winder transmission electric control method: Main transmission by Dual-loop digital DC or AC, and auxiliary transmission by AC frequency control.

III. Super calender transmission control function

Unwinding roll

1)  Uses magnetic powder brakes or four-quadrant converter

2)  Electronically operated while threading

3)  Breaking mode while operating, ensuring stable tension

4)  If there is no tension sensor, it will be necessary to calculate the radius of the unwinding roll

•  Main roll: Main speed

•  Paper roll: Linear proportionality of line speed with the main roll

•  DC busbar (or brake unit + brake resistor)

•  Freewheel stop

IV. Machine coater transmission flying connection control function

•  Unwinding section

1)  Rollover motor control, initial positioning, and photoelectric automatic positioning

2)  Paper roll acceleration wheel, and speed-measuring arm

3)  Paper-receiving mode selection

4)  Paper-receiving arm-lifting, paper-receiving pressure rolling action, and paper cutting knife action

5)  1 and 2 brake inputs for unwinding axle and brake tension settings, #1 tension sensor feedback and actual tension display

6)  Machine speed display and pending display of speed differential of paper-receiving roller

7)  Emergency stop, downtime, threading, crawling, operating, and speed change buttons

•  Scraper coating head

1) Sprinkler lifting

2) Scraper frame long/short schedule control and instructions

3) Scraper frame angle change control and angle instructions

4) Scraper angle change control and angle instructions

5) Coating pump start/stop, flow regulation, and pump speed instructions

6) Emergency stop, downtime, threading, crawling, operating, speed change buttons, and machine speed display

•  Dry box

1)  Control of opening and closing of dry boxes

2)  Emergency stop, opening, and closing of dry box top and bottom

•  Back coating sizing

1)  Lifting of feed pa

2)  Back roll long/short schedule opening and closing

3)  1 start/stop on feeder roll, operating instructions, speed regulation and display

4)  2 start/stop feeder roll, operating instructions, speed regulation, and display

5)  Tension setting, and #2 tension sensor feedback and display

6)  Emergency stop, downtime, threading, crawling, operating, speed change buttons, and machine speed display

•  Dryer and calender

1)  Online dryer, separate jog mode selection, and jog control

2)  Hot water pump, cold water pump start/stop, and operating instruction

3)  Calender setting and online mode selection

4)  Calender without-load opening / closing and instructions, and calender with-load opening / closing and instructions

5)  Calender roll, steel roller jog control and operation instructions in setting mode

6)  Airbag pressure detection and instruction for both sides of the calender roll

7)  Emergency stop, downtime, threading, crawling, operating, speed change buttons, and machine speed display

•  Winding segment

1)  Rollover motor control, initial positioning, and photoelectric automatic positioning

2)  Manual and auto paper receiving mode selection, paper receiving button and instructions

3)  Paper-receiving arm-lifting, paper-receiving pressure rolling action, and paper cutting knife action

4)  Winding axis 1, 2 torque setting, slope setting, diameter setting, and actual torque display

5)  Emergency stop, downtime, threading, crawling, operating, speed change buttons, and machine speed display

•  Main operating platform

1)  QCS human-machine interface

2)  Selection of "blowing" and "blowing and heating" mode for circulation fans, and on-off switch and instructions for circulation fans

3)  Required light and sound alert before machine operations and during machine failures

4)  Emergency stop, downtime, threading, crawling, operating, speed change buttons