Application of CHV100 Inverter to Paper-making Machinery,China Application of CHV100 Inverter to Paper-making Machinery,Application of CHV100 Inverter to Paper-making Machinery Manufacturer.

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Address: No.4 Building, Gaofa Industrial Park, Longjing, Nanshan District, Shenzhen, 518055, China

ZipCode: 518055

Tel: +86-755-86312856 86318602 86318456 (direct line) Mobile: +86 133 169 613 20 /+86 135 100 656 90

Fax: +86-755-8602 8412

Email: wangjian@invt.com.cn

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Application of CHV100 Inverter to Paper-making Machinery

Product Categories: Solution

Company Profile Tel ：+86 755 86312834 86028065 (direct line) Mobile: +86 136 326 868 69 Fax：+86 755 8602 8412 Tel ：+86 755 86312845 86028065 (direct line) Mobile: +86 130 778 019 09 Fax：+86 755 8602 8412 Tel ：+86-755-86312856 86318602 86318456 (direct line) Mobile: +86 133 169 613 20 /+86 135 100 656 90 Fax：+86-755-8602 8412

Product Description:

n Introduction

Paper-making enterprises are enterprises with high power consumption. Each ton of paper may consume over 500 kwh, featuring extremely serious power consumption. The traditional paper-making machinery uses SCR DC speed regulation (high power) and slipping motor (low power) for driving. During the production, such factors as mechanical abrasion and slippage of the drive belt always causes speed mismatch, leading to such phenomena as paper breaking and uneven thickness. To reduce power consumption, optimize product quality and improve the labor productivity, modern paper-making equipment often adopts multiple motors for driving in different parts, that is, every drive part is installed with an AC motor and configured with the corresponding inverter. The individual parts are required to implement synchronization control, so that speed regulation can be conducted in certain range. In the following a paper-making plant in Tianjin is taken as an example to illustrate the application of INVT-CHV100 inverters to paper-making machinery.

n Paper-making Process

According to the paper forming order, the basic components of a piece of paper-making machinery include: fourdrinier part, pressing, pre-drying, post-pressing, post-drying, calendar, and paper rolling machine. The process is as follows: The paper pulp from the head box is dehydrated and formed in the fourdrinier part, compressed in the pressing part to bring even and uniform paper layer, dried in the pre-drying part, sized in the post-pressing part, dried in the post-drying part, smoothed by use of a calendar, and finally formed into paper rolls by means of the paper rolling machine. The paper-making flow chart is as follows:

Site of Paper-making Machinery

n Control Solution

A paper-making plant in Tianjin uses DC speed regulation for post-drying, calender and paper rolling machine in the paper-making production process. Presently, the INVT-CHV100 inverters are used for drive control of the multi-motor parts. The specific control requirements are as follows: (1) all the five inverters adopt closed loop vector control, to increase the variable frequency speed regulation control precision and the system start capability. (2) The first three dryers and the fourth calender should operate at the same linear speed. (3) The fourth calender should have the function of automatic conversion from torque to speed. When operating in torque control mode, the calender can perfectly balance the tension change of the paper after output from the post-drying roller, to effectively avoid damage to the paper surface due to slippage upon press polishing, and meanwhile, to provide perfect paper feeding conditions at the winding side. (4) The fifth one is used for paper winding control (paper rolling machine). It is required that the tension should be constant upon winding. This system does not have tension feedback; therefore, the tension-free feedback torque control mode is used for control at the paper winding side. The electric wiring diagram of the control system is shown as follows:

Electric Control Diagram of the Paper-making System with Five Drive Points

The first inverter in the system adopts the AI1 channel to set frequency. The second through the fourth inverters adopt the “A+B” mode to set the frequency. The main frequency “A” uses the inverter Analog output “A01” signal of the previous stage to make setting, and overlap frequency “B” uses AI2 channel to set, serving as the fine tuning of the drive speed, so as to implement synchronous operation of the system. The fifth inverter adopts the control solution of “CHV100 + PG card + tension card”. The tension control mode is: tension-free feedback speed control. The linear speed method is used to measure the winding diameter. The setting of the linear speed originates from the analog output “A01” of the fourth inverter. The relay output serves as fault indication.

n Parameter Settings

1) Inverter 1

P0.01 1 Vector control with PG

P0.01 1 Terminal command channel

P0.03 1 AI1 setting frequency

P0.11 5 Acceleration times 0

P0.12 2 Deceleration times 0

P2.01 50 Rated frequency of motor

P2.02 1460 Rated rotation speed of motor

P2.03 380 Rated voltage of motor

P2.04 23 Rated current of motor

P2.05 11 Rated power of motor

P3.10 1000 PG parameter

P3.11 1 PG direction selection

P5.02 1 Forward operation

P5.03 7 Fault reset

P5.04 6 Free stop

P6.04 3 Fault output

2) Inverter 2 through 4

P0.00 1 Vector control with PG

P0.01 1 Terminal command channel

P0.03 1 AI1 setting frequency

P0.04 0 AI2 setting frequency

P0.06 2 A+B frequency setting

P0.11 5 Acceleration times 0

P0.12 2 Deceleration times 0

P2.01 50 Rated frequency of motor

P2.02 1460 Rated rotation speed of motor

P2.03 380 Rated voltage of motor

P2.04 23 Rated current of motor

P2.05 11 Rated power of motor

P3.10 1000 PG parameter

P3.11 1 PG direction selection

P3.13 30% Keypad setting torque (Inverter 4 setting)

P5.02 1 Forward operation

P5.03 7 Fault reset

P5.04 6 Free stop

P5.05 3 Torque control disabled (inverter 4 setting)

P6.04 3 Fault output

3) Inverter 5

P0.01 1 Vector control with PG

P0.01 1 Terminal command channel

P0.11 5 Acceleration times 0

P0.12 2 Deceleration times 0

P2.01 50 Rated frequency of motor

P2.02 1440 Rated rotation speed of motor

P2.03 380 Rated voltage of motor

P2.04 8.9 Rated current of motor

P2.05 4 Rated power of motor

P3.10 1000 PG parameter

P3.11 1 PG direction selection

PF.00 1 Tension-free feedback torque control

PF.01 0 Winding mode

PF.04 120 Maximum tension

PF.06 63 Tension digital setting

PF.10 25 Tension taper coefficient

PF.11 1 Mechanical drive ratio

PF.12 1.52 Maximum winding diameter

PF.14 0.5 Winding diameter 0

PF.18 0 Linear speed method

PF.22 260 Maximum linear speed

PF.23 1 AI1 linear speed input

PF.24 0.5 Maximum linear speed

PF.33 5 System inertia compensation system

PF.34 800 Material density

PF.35 1.5 Material width

n Summary

Practice shows that, the INVT-CHV100 PG vector (closed loop vector) variable frequency speed regulation solution can perfectly meet such control requirements as speed setting, speed fine tuning, acceleration/deceleration control, speed/torque switchover, load allocation and winding during paper-making production. With the application of the CHV100 high-performance vector inverters, the system features large start torque, powerful overload capability, quick dynamic response, and high speed stabilizing precision. INVT-CHV100 inverters provide perfect solutions for paper-making machinery, which omits the PLC, reduces power consumption, improves the productivity, and saves more costs for users. Therefore, the INVT-CHV100 inverters have found wider and wider application in the low-speed and medium-speed paper-making industry.

n Reference

1. User Manual for CHV Vector Inverters Shenzhen INVT Electric Co., Ltd.

2. User Manual for CHV Vector Inverter Extension Card Shenzhen INVT Electric Co., Ltd.

3. Paper-making Processing and Technology Chemical Industry Press