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Paper Mill in India - INVT GD35 Series Close Loop Vector Control Inverter
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Abstract:
This paper mainly presents INVT GD35 series close loop vector control inverter used for paper mill controlling multi motors through CANopen communication protocol.
Keywords: GD35, close loop control, CANopen communication.

I.Introduction
The major processes of paper industry are Pulping, modulation, manufacture and processing.
1) Pulping is the first step of paper making. Wood will be turned to pulping in this process.
2) Modulation is an important process. It determines the paper quality, like strength, color, printing, storage period.
3) Manufacture is making the raw paper to shipping roll. The major processes are filtering raw paper, pressing, winding, cutting, packing.

Schematic diagram of paper making process
II.Project information and Solution
1. Project information
This paper mill designed capacity is 40Ton annually. It requires 88 nos drive upto 132kW. The major applications name and motor ratings are as follows:

SN

Drive Name

INVT drive

Output reactor

Motor KW

Qty

1

Couch Roll

GD35-132G-4-C1

OCL2-132-4

110

1

2

Press 1

GD35-090G-4-C1

OCL2-090-4

55

1

3

Press 2

GD35-090G-4-C1

OCL2-090-4

55

1

4

Pre Dryer 1

GD35-037G-4-C1

OCL2-037-4

30

1

5

Pre Dryer 2

GD35-037G-4-C1

OCL2-037-4

30

1

6

Post Dryer

GD35-037G-4-C1

OCL2-037-4

30

1

7

Size Press Top & Bottom

GD35-018G-4-C1

OCL2-018-4

15

2

8

Post Dryer

GD35-037G-4-C1

OCL2-037-4

30

1

9

Pope Reel

GD35-030G-4-C1

OCL2-030-4

22

1

10

Fan Pump

GD35-110G-4-C1

OCL2-110-4

75

1

11

Head Roll

GD35-5R5G-4-C1

OCL2-5R5-4

2.2

1


Dryer section photos are as below:

2. INVT solution
In order to realize high accuracy and high response speed, GD35 is applied for this paper mill along with Canopen communication card, the system diagram is as below:

III. System commissioning
After the mechanical installation, power on and follow the below commissioning steps:
A, Restore the factory setting
B, Set the motor parameters and perform the motor autotune.
C, Set the encoder, communication, input terminals parameters
D, Coordinate with PLC, test the system

Control panel


GD35 inverters

IV. Advantages and benefits
•  Close loop vector control, high accuracy.
•  CANopen communication, fast and stable communication.

Speed ratio

11000

Speed control accuracy

±0.02%

Servo control

Pulse given set, you can positioned anywhere in control

Divider output Torque response

<10ms

Torque control accuracy

≤5%

Starting torque

0.00Hz/200%

Overload capacity

150% of rated current for 1 minute, 180% of rated current for 10 seconds, 200% rated current for 1 second

Divider output

Encoder pulse divider output (H1, D1-type terminals)

Speed / position mode switch

Support Terminal switch

Encoder

A1 inverter supports 200kHz, B1, C1 inverter supports 100kHz,
D1 inverter supports 500kHz, H1 inverter supports 300kHz

Positioning performance

Support Z pulse and photoelectric switch positioned, accurate positioning without overshoot


V. Conclusion
GD35 series close loop vector control inverter is successfully used in paper mill processes, and performance, accuracy and stability all meet the process requirement.

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Email: overseas@invt.com.cn
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