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Keywords: centrifuge, chemical industry, frequency converter, V560;
I. Introduction of Industrial Centrifuge Technology 1.1 Introduction of Industrial Centrifuge The industrial centrifuge mainly separates solid and liquid by centrifugal force, and generally consists of feed, washing, dehydration, knife, and unloading, including feeding, washing, and sealing. Knife, unloading and other parts through the solenoid valve, pneumatic valve control, centrifugal kettle is the main component to achieve the separation of solid and liquid, by a three-phase AC motor through the belt drive. According to the characteristics of the process, the material is mainly a solid-liquid mixture at the beginning, and the load is relatively large when it is started. When a certain rotation speed is reached, the liquid flows out from the outside of the centrifuge under the action of centrifugal force, so that part of the liquid is first separated out with the speed of the motor. With further improvement, the load is also reduced accordingly. According to the process requirements, generally divided into several different speeds to achieve the separation effect.
1.2 Industrial centrifuge process requirements Centrifuge feed, washing, dehydration, scraper four (multi) section speed control, feed speed 120r/min, washing to run 200r/min, dehydration speed 960r/min, scraper Running speed 500r/min;
In order to increase production efficiency, start and stop times are shorter;
The motor can decelerate by itself during parking without any additional resistance.
Second, the electrical configuration program 2.1 Traditional frequency plan Anhui chemical plant transformation project of the industrial centrifuge is a rated current of 45KW, speed 960r/min 6-pole motor, using Y-â–³ start-up mode, the motor driven by the belt drive the rotating body Operation, the pulley on the motor is equipped with a friction type centrifugal clutch, and the relay and the hydraulic coupler control the speed.
2.2 frequency conversion reform program Centrifuge for constant torque load, starting torque and mechanical inertia is relatively large, the inverter's selection is generally used to amplify a file, so we choose a square V560 series 55KW vector inverter. Change the original motor side friction type centrifugal clutch type pulley to the direct drive ordinary pulley. The multi-speed function of the frequency converter is used to accurately control the rotation speeds of the centrifuge's feeding, washing, dewatering and scraping tools in four working phases. The working status of the centrifuge adopts the original PLC control system to provide the inverter with the working status signal of the centrifuge. The inverter's rotation speed is set in the multi-speed function of the inverter.
Third, the industrial centrifuge frequency conversion system 3.1 system main configuration:
The electrical diagram of V560-4T0550 vector inverter, DBKU-4T0900 brake unit and 18KW/8Ω braking resistor is as follows: 
In the figure above, DI1/CM is set as the start/stop control terminal of the inverter. When DI1 and CM are closed, the inverter starts. If DI1 and CM are disconnected, the inverter is stopped.
DI2 ~ DI6 terminals for the digital signal port, the common end of the CM, that is closed with the CM effective. Among them, DI2, DI4, and DI5 terminals are set as the multi-speed control of the inverter. DI2 is the feeding speed, DI3 is the washing speed, DI4 is the dehydrating speed, and DI5 is the squeegee speed. DI6 is set as the fault reset.
L1, L2, and L3 are three-phase inputs, and U, V, and W are three-phase inverter outputs.
TA/TB/TC is the relay output terminal of the frequency converter, among them TA/TB is the normally closed port, TA/TC is the normally open port. According to the actual electrical design and its control requirements, the customer can very conveniently select the normally closed or normally open port as the alarm output.
P+ and P- are the external braking unit ports of the inverter. The POW terminal of the braking unit is connected to the 24V power supply of the inverter. The ENA terminal is connected to the CM grounding terminal of the inverter. P+ and PB are the external braking resistor ports.
3.2 debugging parameters:
IV. Precautions for Commissioning Centrifugal machines have large starting torque and are difficult to start. Therefore, the starting torque of the inverter should be as high as possible. If overcurrent and overload alarms occur during acceleration, the acceleration time of the inverter should be appropriately extended.
The mechanical inertia of the centrifuge is large, and the motor is in the state of power generation during deceleration. Therefore, the braking unit and braking resistor must be installed in the system. If deceleration overcurrent, overvoltage alarm or heat generation of the braking resistor is serious during operation, the braking resistor power may be amplified and the deceleration time may be prolonged.
Fifth, after the transformation of the effect of long-term use of the frequency system:
Large starting current: The motor Y-â–³ starting current is 2 to 3 times of the rated current. Frequent starting of large current can easily cause the motor temperature to rise, and the insulation aging will damage the motor.
Large mechanical vibration: large starting and stopping of mechanical vibration, high maintenance and repair costs;
Long start and stop time: The centrifuge has large mechanical inertia and small friction. The traditional friction block brakes and the stopping time reaches 200S. It needs to be slowly accelerated during start-up. Each start requires 180s, and the start and stop time is long and the work efficiency is low.
The advantages of frequency conversion system:
The soft start of the motor is realized. The inverter starts from 0HZ and the current is only one-third of the full-voltage start-up, which effectively reduces the impact on the power grid.
Smooth start, eliminate mechanical impact, protect machinery and equipment to extend equipment life;
Effectively shorten the start and stop time, start time 100S, stop time 100S, improve production efficiency;
The multi-speed function of the frequency converter accurately controls the rotation speeds of the centrifuge's feeding, washing, dewatering, and scraping tools in four working stages, eliminating the need for hydraulic couplers and other components in the industrial frequency system;
The system adopts variable frequency speed regulation to effectively achieve energy saving and consumption reduction and improve the use efficiency.
Sixth, concluding remarks This text has introduced the systematic scheme that the Quartet V560 vector frequency converter applies in the industrial centrifuge, through the frequency conversion velocity modulation, may choose according to different craft request multistage speed movement, the frequency conversion control realizes the soft start of the electrical machinery may effectively reduce the impact to the electrical network , Strong starting torque and DC braking, energy consumption braking and other functions, effectively reducing the start and stop time of the centrifuge. The program has achieved very good results at the scene.
references:
1. "V560 Series High Performance Vector Inverter Manual" Shenzhen Sifang Electric Technology Co., Ltd. 2. Li Fangyuan. Inverter Industry Application Practice, 2006 (1)
Application of Quartet V560 Frequency Converter in Centrifuge
Abstract: An industrial centrifuge, also known as a separator, accomplishes the separation of a solid or liquid from a mixture by the action of centrifugal force. The old industrial frequency centrifuge motor has large starting current, large mechanical vibration, long on-off time, and low work efficiency. The use of frequency converter to control the centrifuge can effectively reduce the impact of the start-up current, acceleration and deceleration time can be arbitrarily set according to the load and process requirements, improve work efficiency. This article describes a Anhui chemical plant using Quartet V560 series inverter to transform the original centrifuge and achieved good results.
Function code
name
Factory default
Setting value
F0.0.09
Motor type and control mode selection
0000
0000
F0.2.29
Frequency setting 1 panel digital setting (feed speed)
0.0
10.00
F0.3.33
Control command 1
0
1
F0.4.44
DC brake control
0
1
F0.4.45
DC hold/control start frequency/speed
2.00
1.00
F0.4.46
DC braking time
0.0
20.0
F0.4.47
DC brake/brake injection current
50.0
10.0
F1.0.03
Acceleration time 1
5.0
100.0
F1.0.04
Deceleration time 1
5.0
100.0
F1.1.13
Carrier frequency
6
4
F1.1.14
Carrier characteristics
0111
2111
F1.4.39
Acceleration/deceleration current limit level
160
200
F2.0.00~ F2.0.04
Rated motor parameters
According to the actual motor parameter settings
F2.2.52
Vector mode start excitation time
0.5
1
F2.2.53
Motor parameter measurement (vector self-learning)
0
1
F3.0.00
Multi-function input terminal DI1 (start)
0
7
F3.0.01
Multi-function input terminal DI2 (feed)
0
1
F3.0.02
Multi-function input terminal DI3 (washing)
7
2
F3.0.03
Multi-function input terminal DI4 (dehydration)
8
3
F3.0.04
Multi-function input terminal DI5 (scraper)
13
4
F3.0.05
Multi-function input terminal DI5 (reset)
0
13
F6.0.00
First operating frequency (wash speed)
5.00
20.00
F6.0.01
Second operating frequency (dehydration speed)
10.00
50.00
F6.0.02
3rd operating frequency (scraper speed)
15.00
30.00