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Papermaking Factory Case in Romania - INVT Goodrive5000 MV Inverter
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Summary: In this paper,through introducing INVT Goodrive5000 medium voltage inverter applied to pulper in the papermaking factory in Romania, to illustrate VFD transformation of the feasibility and many advantages after using MV inverter.
Keyword: Goodrive5000MV inverter、pulper、soft start;


1.Introduction

The pulper is an important device at the beginning of the process of papermaking. The pulper is mixed the recyclable paper and water equably, after mixing and stirring they become pulp.
In traditional ways, the papermaking factory use grid power directly driving the pulper. There are lots of disadvantages by this way. Such as large impact current when starting the pulper, can’t automatic controlled by DCS or PC system, easily blocked by plastic and etc. These problems always perplex the papermaking factory.

As the development of inverter technology, many papermaking factory customers realize that using inverter to drive pulper is much better than original ways.


2.Project Analysis

ECOPAPER papermaking factory is very big factory in Romania. The average production of paper capacity is about 1000 tons/day.
Detailed motor parameters are list as follow:
Table 1 Motor Parameters

Motor Model

Power

Rated Voltage

Rated Current

Rated Speed

Power Factor

Load Type

Quantity

YKK-4505-4

710KW

6KV

81.6A

1488RPM

0.88

Pulper

1pcs


On-site pictures:

Figure 1, the pulper control system

Figure 2, the recyclable paper conveyor

Figure 3, the pulp tank (From bottom to top)

Figure 4, the paper production.

3.System Configuration
According to the customer requirement, we choose the Goodrive5000 series Medium-voltage inverter, produced by Shenzhen INVT Electric CO., LTD.
The MV inverter model is Goodrive5000-A1600-06-S with bypass cabinet. Below table is the details of MV inverter parameters:

Table 2 MV inverter Parameters

MV inverter Model

Rated Capacity

Rated Power

Rated Voltage

Rated Current

Goodrive5000-A1600-06-S

1600KVA

1250KW

6000V

154A


Below figure is about inverter system diagram:



Figure 5, System diagram of the inverter
On-site pictures:

Figure 6, the motor and pulper

Figure 7.Goodrive5000 MV inverter

Figure 8, the pulper running current curve

4.Application and Advantage
After using inverter, there are some advantages as follow,
1) Soft start; The speed of pulper can running from 0 to rated speed, the acceleration time adjustable as the customer need.
2) Easily control by DCS; With digital and analog connection, it is easy to control;
3) Low harmonic. Without harmonic pollution to the motor and efficiently drop the heat of the motor. Increase the input power factor.
4) Reduce the loss of shutdown maintenance and save plenty of maintenance costs.
5) Running direction flexibility. When the customer find the pulper is blocked, they can use reversal jog function, after running at reversal state for some seconds the pulper continue running at forward state.
 
5. Conclusion
After using INVT Goodrive5000 series MV inverters to drive pulper, the inverter can meet with the customer requirement, which can automatic control by DCS system and soft start. Good operation of the inverter, obtained the customer widely recognized.

Reference
[1] Goodrive5000 Series High-voltage Variable Frequency Speed Control System Manual.    Shenzhen Invt Electric CO., LTD.

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Email: overseas@invt.com.cn
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