• Nyzhnodniprovska Street, 8
    Ukraine, 69091 Zaporizhzhia
  • +38(061) 270-78-17
    info@etm.io
05
Jun 19
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Automated control system of the fish processing unit

Due to sterilization, canned food can be stored for a long period of time. There are lots of reasons in the canned food production, which may result storage period reduction. Some of the causes are: heterogeneity of heating of the jars in the autoclave, incomplete observance of technological process parameters – temperature, time intervals, in other words, sterilization formula and others.

Therefore, constant equipment condition and production process monitoring are integral part of a technological process and necessary condition for the high quality products production.

System development purpose: to provide modern means of process control, technical accounting of energy resources and ability to view and analyse archive process parameters

As a result of implementing automated process control system, administration and staff of the fish processing plant got convenient and versatile tool to control technological process, as well as ability to archive process parameters.

  • Client JSC "Zaporizhstal"
  • Skills Automation
  • Website https://www.zaporizhstal.com
  • Share
  • Project Starting Date

    12.12.2017

  • Project End

    20.12.2017

  • Category

    Metallurgy

Automated control system of the fish processing unit implements:

  • providing personnel with monitoring tools of current equipment condition and canned food production parameters(temperature in the furnaces and autoclaves, pressure in autoclaves, temperature and level of the sauce, etc.)
  • current status display of technological equipment on PC mnemonics, on the local graphic display of the operator terminal, located directly at the unit, as well as on digital indicators built into the autoclaves;
  • visualization of technological parameters time displaying on diagrams;
  • technical account of the expenses and energy parameters (flow rate and water pressure);
  • automatic control of the sauce vessel level;
  • pre-emergency and emergency alarm on the mnemonic for signalling about beyond norm process parameters and triggered protection;
  • recording of the pre-emergency and emergency situations, staff actions on elimination of technological process violations and facility management;
  • distinction of the access to the system capabilities by password ;
  • process parameters archiving (archive depth – more than 5 years)
  • overall conveyors control;
  • sauce pump control.
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Structure of automated control system of the :

Principle of automated control system construction is traditional. The basic functions of data control and collection are performed by controller installed in process automation cabinet. The controller is equipped with the necessary means for galvanic isolation and conversion of sensor signals into digital form as well as assigning control actions. Control cabinet is connected by information channels with a graphical operator terminal(installed directly on the cabinet door), digital indicators (installed in autoclaves), as well as top level computer located in a separate room.

Automated control system of fish processing unit includes:

  • personal computer;
  • cabinet of automated process control;
  • operator terminal (our own development). Has a graphic display and keypad;
  • digital indicators;
  • sensors installed on process equipment.

All signals from sensors connected to the cabinet of automated process control, which is located in the unit and is hinged. Signals of the automated process control cabinet are sent to normalization motherboard and galvanic isolation (our own production). Further analogue-to-digital conversion (PCL-818, Advantech) and discrete input boards(UNIO-95-5, Fastwel) are used, they are digitise. Obtained values are programmatically converted into real variables (PCA-6753, Advantech) and transmitted through information communication channels to PC, local operator terminal and digital indicators for displaying and archiving.

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Software of automated process control system

Software of process control automation system is based on SCADA/HMI system Trace Mode 5.

F or compatibility with Trace Mode 5 Built-in software of graphic operator terminal and digital indicators have been modified. Which resulted connection on the native for Trace Mode protocol M-Link (RS-485). Connectedness between automated process control cabinet Central control panel was implemented through the Ethernet channel.

Function funds control system distributed as follows:

  • PC: displays the mnemonic, data in diagrams, archiving, backup archive on the media;
  • Automated process control cabinet: data collection, analysis, formation and delivery of control actions, data transmission to other nodes of the system;
  • Graphic operator terminal: displays key information about the technological process at unit;
  • Digital indicator: displays current value of the camera temperature and pressure in the autoclave steam generator.

In the process of working with PC, monitor displays the mnemonic technological process. The mnemonic schematically shows the equipment and placement of sensors. Switched on equipment is distinguished by backlight or image of movement.

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The mnemonic displays following process parameters:

  • steam pressure in the steam generator and temperature in the autoclave cameras;
  • the temperature in solting baths;
  • level of the sauce in the pot;
  • number of cans coming down the conveyor;
  • flow of cold water;
  • oil temperature in the roasting furnace;
  • pressure of cold water in the line;
  • air pressure in the line;
  • steam pressure in steam generators.

During operation the system forms so-called report of alerts, which is recorded in form of various kind operational information messages:

 

  • system information;
  • messages about critical situations;
  • messages about alarms;
  • messages about changes in the system operation modes;
  • registration of operator actions.
05
Jun 19
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Fodder production line management system

Combined feed (fodder) is a homogeneous mixture of forage resources (grain, bran, fodder of animal origin, mineral supplements) high in protein, vitamins and minerals for farm animals and poultry nutrition. Depending on fodder feeding value it is divided into: full fodder, mixed fodder concentrates, balancing fodder supplement (protein-vitamin, protein-vitamin-mineral) and premixes.

Extrusion method is the most popular among all methods of animal feed production. It allows to improve the qualitative properties of the end product compared to traditional methods. During the production process the feed is effected by brief and very intense mechanical and barothermal impacts, which are followed by structural, mechanical and chemical feedstock changes. Due to the short duration of the process, vitamins and amino acids, which are contained in grains, are almost completely saved. And digestibility is increased to 90%. Extruded feedstock is practically not affected by bacteria when stored under normal warehouse conditions (for 3-4 months). This fact is of special value for the fattening of young animals (cattle, pigs, horses, rabbits, etc.). Feeding young animals with extruded feedstock 1,5-2 times reduces their gastrointestinal disease mortality. It should be noted that the quality of the finished product is not affected by humidity of the processed raw materials and possible small number of seeds of other crops.

Flowsheet and equipment are selected depending on formulation and the manufactured feed.

  • Client JSC "Zaporizhstal"
  • Skills Automation
  • Website https://www.zaporizhstal.com
  • Share
  • Project Starting Date

    12.12.2017

  • Project End

    20.12.2017

  • Category

    Metallurgy

Technology of production

One of the most simple and effective technological schemes of animal feed production is serial (in-line) scheme. The source components are pre-cleaned and each one is placed into separate bunker. After that the components are weighed metered depending on the form of manufactured feed. Prepared mixture goes into crusher, which simultaneously does component shredding and mixing. Then mixture is sieved goes into extruder. While extrusion milled mixture is treated by high mechanical pressure (30-50 atm), it heats up due to friction (120-150 ºC) and turns into crashed mass. At the exit of the extruder the mass swells , due to the large pressure drop. The starch contained in the end feedstock turns into dextrin, which is easily assimilated by the animal organism, and a large part of the micro flora (bacteria, fungi) is destroyed.

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Developed management system provides fodder production with:

  • continuous operation and equipment control of the unit;
  • manual and automatic control of transport (conveyors, bucket elevators, valves, changeover valves) and process (crusher, extruder) equipment of the unit;
  • control of the silos filling level(with the use of level sensors with analog & discrete signals);
  • crusher smooth start(200 kW);
  • regulating of feedstock supply to the crusher depending on crusher load level;
  • display of equipment operating modes status and emergency situations.

In development of the control system was performed integration into extruder automation system which is unique for Ukraine – ExtruTech, Bliss (USA) performance 6 t/h.

05
Jun 19
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Boiler automation for biofuel combustion (sunflower husks)

Boiler is designed to provide plant technological system with the steam (steam dryers, steam conditioning, filtration line , extraction unit). Sunflower husk is used as a fuel, which is the main waste product of the oil extraction plant.

Main technological equipment of the boiler is divided into several subsystems with separate control systems:
  • water treatment subsystem;
  • boiler control subsystem;
  • precipitator control subsystem.

By means of transport equipment sunflower husk enters through the intermediate hopper the solid fuel boiler, where it is burned. Prepared feed water enters the boiler, where it becomes steam, which is used for production needs. Cleaning of flue gases is carried out by electrostatic precipitator. Dust, which is caught by the precipitator and products of combustion move to the ash hopper.

Given process control systems is a top level automation system, which provides control, display, interchange and archiving of the whole boiler control process. It is shown on the boiler operator screen.

  • Client JSC "Zaporizhstal"
  • Skills Automation
  • Website https://www.zaporizhstal.com
  • Share
  • Project Starting Date

    12.12.2017

  • Project End

    20.12.2017

  • Category

    Metallurgy

Feedstock weighing and receiving unit

Water treatment subsystem

Preparation of feed water is an integral part of the process of any boiler. Source water is filtrated, deionized and degassed. Separate stages of this process can be done different technological ways. LLC “Agroprominvest 08” steam boiler has chemical water treatment line with the separate control system.

Boiler control subsystem

The main element of the steam boiler is a solid fuel boiler, designed for the biofuel combustion (sunflower husk). Particular features of burning this type of fuel require special boiler operating mode. Boiler supplying system is manufactured by JSC “Biysk boiler factory” and meets all necessary requirements.

Precipitator control sybsystem

As a result of fuel combustion flue gases are formed in the boiler furnace, which have to be pre-treated before discharging to the atmosphere. Boiler-houses and thermal power plants use electrostatic filters as the treatment facilities, which precipitate the dust under the action of electrostatic field. The electrostatic precipitator comes with its own electrical system and control system.

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Advantages of the implemented steam boiler control system:

  • full boiler workflow display of all subsystems;
  • sensors data collecting and processing, and transfer of key performance indicators to the operator display;
  • automated major boiler systems performance monitoring, including security systems;
  • alarm in case of emergency situations;
  • ability of quick reaction and control actions performance in automatic mode to prevent emergency situation diffusion;
  • recording, archiving and storing of the process data of abnormal situations and operator actions.
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Scope of work done:

  • Development of power supply project documentation;
  • Development of project documentation for power electrical equipment and process automation;
  • Manufacturing of electrical equipment, according to the project parts:
    • automation and input/output signal cabinets (on the basis of Siemens equipment);
    • cabinets of technological equipment and machinery control (on the basis of equipment of Siemens, Eaton);
    • cabinets and power input and distribution of electricity (on the basis of equipment of Siemens, Eaton, ABB);
  • Installation of cabinets for the system of automation, input and distribution of electricity;
  • Installation of cabling systems, wiring of power and data circuits;
  • Development and adjustment of software for complex control(TIA Portal STEP7 and HMI package(SCADA-system TRACE MODE 6);
  • Integration into the general system of technological equipment automation:
    • control system of chemical water treatment line;
    • control system of solid fuel boiler;
    • control system of electrostatic precipitator flue gas treatment;
  • Commissioning, training and maintenance of the facility.
04
Jun 19
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Grain reception, storage, processing and preparation complex automation

Automated grain reception, storage, preparation and processing complex consists of several branches:
  • Department of feedstock weighing and receiving from road transport (carrying capacity up to 30 t);
  • Feedstock storage silos(concrete – volume about 20 thousand m3, metal – volume about 50 m3);
  • Dryers unit (capacity – 15 t/h 40 t/h 50 t/h).

Main purpose of the complex is effective storage of the product, and provision of an oil extraction plant raw material for the manufacture of oil – sunflower seeds and soybeans. The versatility of the system allows to accept for storage and other bulk culture

  • Client JSC "Zaporizhstal"
  • Skills Automation
  • Website https://www.zaporizhstal.com
  • Share
  • Project Starting Date

    12.12.2017

  • Project End

    20.12.2017

  • Category

    Metallurgy

Feedstock weighing and receiving unit

Consists of truck scales (load capacity 30 tons), unloader, transport mechanisms (conveyors and bucket elevators) and aspiration systems. Unloading and reception process is performed in the local mode, in coordinartion with overall management system and is displayed on the screen of the operator automated workplace.

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Storage unit

Grain storage consists of few units:

  • silo type metal storage;
  • working elevator tower.

Both storages have transport equipment (conveyors, bucket elevators) and the mechanisms of the feedstock directed flow (rocker valves, gate valves). Technological routes and equipment control system is constructed the way that ensures uninterrupted plant feedstock supply in case of emergency on any production line. System of mechanism control allows to pump the feedstock from one storage to another. The storage is equipped with top-level and temperature sensors and ventilation.

Dryer unit

Dryer unit is designed for drying of high moisture content feedstock – if there is no way to dry it by means of storage ventilation. Feedstock supply and selection is done by the transport mechanisms (conveyors, norias). If it is impossible to reduce feedstock moisture content in one dryer pass, drying process can be looped until desired moisture content is reached with the help of reversible valve.

Control system is equipped with one operator workstation. It is flexible and can be performed remotely from the operator workstation or from local control mechanisms (in the case of production necessity or emergency situations).

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Advantages of the implemented control system of the grain reception, storage, prepararion and processing:

  • full operational process display;
  • optimization of the process control system;
  • control of storage feedstock filling;
  • feedstock temperature and moisture level control;
  • equipment process control;
  • alarm signals of equipment stopping/locking ;
  • simplification of abnormal situation causes search;
  • equipment and machinery flexibility – ability to work in manual mode in case of emergency – for the smooth operation of the complex.

Structure of the work done:

  • Project documentation for technological automation section, power equipment;
  • Design documentation for the automation system cabinets:
    • Technological automation cabinet (based on SIMATIC PLC S7-400);
    • Cabinets of remote input/output signals (stations of distributed input/output ET-200M, analog and digital modules of input/output);
    • motor control cabinets (automatic switches for motor protection, contactors, automatic and manual control schema);
    • local cabinets of control mechanisms (control cabinets of rocker valves and gates, fan control and stripping screws silos).
  • Introductory and power distribution cabinets design documentation;
  • Assembling and installation of cabinets for automation system, electricity input and distribution;
  • Installation of cabling and wiring of power and data circuits;
  • Development and adjustment of plant control software based on TIA Portal (STEP7 and SCADA system Win CC);
  • Adjustment works, staff training and commissioning of automation system.
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04
Jun 19
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Oil extraction plant automation

The plant is designed to operate on two types of feedstock – sunflower seeds and soybeans, in this regard, the technological process at certain stages forks.

       Technological process of sunflower oil production contains:

  • cleaning of seeds on huller machines;
  • dividing of processed mass into fractions (kernel, husk, not fully processed, over processed);
  • heat treatment of seeds with steam conditioning;
  • hot pressing of the treated seeds in a screw press;
  • filtering of the oil after first pressing;
  • cooling of oil cake and transfer to extraction unit;
  • oil extraction;
  • oil gathering and storage;
  • gathering, storage and shipment of oil cake after extraction.
  • Client JSC "Zaporizhstal"
  • Skills Automation
  • Website https://www.zaporizhstal.com
  • Share
  • Project Starting Date

    12.12.2017

  • Project End

    20.12.2017

  • Category

    Metallurgy

Automated process control system of the plant consists of three local subsystems:

  • weighing, reception and unloading of the feedstock from the road transport (150/30 tons); elevator (storage silos – total about 70 thsd m3);
  • oil-press shop, oil storage unit; oil meal storage and shipment unit, hulls and husks (oil pressing unit, production capacity 600 t/day)
  • extraction unit(capacity 600 t/day)

     Each subsystem has a separate operator workstation that allows monitoring and operational management of the production process. In the case of production necessity or emergency situations related to the failure of equipment, subsystems can operate in standalone mode, thereby ensuring the continuity and independence of certain stages of the process.     the Overall structure of the equipment of the plant contains about 250 units of technological equipment and machinery. Management of transport mechanisms (conveyors, bucket elevators, valves, changeover valves), Rosalina winnowing and aspiration equipment is performed from centralized control cabinets. The management of individual equipment (presses, air conditioners, oil cake coolers, oil pumps) is supplied from the local control cabinets. Oil extraction plant is a complex process object.

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Obvious advantages of the embedded control system:

  • full technological process operational display;
  • optimization of the plant control process;
  • display and record of the amount of raw materials and finished products;
  • technological equipment operation control;
  • alarm in case of stopping or locking of technological equipment by the product ;
  • emergency causes finding simplification;
  • flexibility and the ability of separate units, equipment and machinery to work in manual mode in case of emergency, to ensure smooth operation of the plant.

During the construction of an oil extraction plant our company has carried out:

  • Development of power supply project documentation;
  • Development of design documentation on electric power equipment and process automation;
  • Manufacturing of electrical equipment, according to sections of the project (Siemens , Eaton, Schneider Electric, ABB and other components);
  • Power supply equipment installation;
  • Installation of electrical equipment of oil-press unit, Elevator, boiler and process facilities automation systems;
  • Development and adjustment of software control of the plant based on TIA Portal STEP7 and SCADA system Win CC);
  • Integration into the overall technological equipment automation system of the following manufacturers:
  • Staff training and further support of the object.
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03
Jun 19

The system of the automatic control of the length of the strip between the pulling rollers and mill stand DUO in the loop pit of continuous pickling line NTA-1

Contemporary high-speed strip processing lines require additional devices, creating metal reserve to provide continuous operation of the line. In the cold reduction of the strip departments there are continuous pickling lines, galvanizing, electrolytic tinning, annealing and cutting.

During the continuous strip moving at a constant speed through the technological line arises the need of stopping head or tail part of the machine for welding the ends of rolls, the weld cutting, installing the roll on the uncoiler and removal of the roll from the winder after handling on the line.

Currently, at the head and tail parts of the machine are installed devices providing a stock the strip for the welding process, as well as installation and removal of the roll. Such devices are loop pits with freely sagging loop.

For the continuous work the continuous-pickling line between the welding machine and pickling bath band is laid as loops in a specially constructed pit in the floor of the shop. Loops in the pit are arranged horizontally, and the band is gradually stretches by pulling rolls in the pickling bath.

For the stable operation of pickling line NTA-1 was created a system of automatic control of the length of the the strip into a loop hole.

  • Client JSC "Zaporizhstal"
  • Skills Automation
  • Website https://www.zaporizhstal.com
  • Share
  • Project Starting Date

    12.12.2017

  • Project End

    20.12.2017

  • Category

    Metallurgy

The system carries out the tasks:

  • measuring the length of the the strip, entering and coming out of the loop pits; calculating the length of the strip (loop), located in a loop pit;
  • calculating the length of the strip (loop), located in a loop pit;
  • setting the limit loop length values in the loop pit;
  • loop length indication in digital form;
  • light signals and control commands (stopping the mill stand DUO) on reaching the loop length defined limits.
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03
Jun 19

Software and hardware complex of controlling «Quarto» measure cut machine

The complex is intended for day and nightautomatic control of mechanisms and electrical equipment of measure cut machine. Apart from cutting the strip it also provides counting sheets in a formed pack.

The existing old machine control system was replaced by a system based on modern industrial controllers for harsh environments, and advanced sensors.

  • Client JSC "Zaporizhstal"
  • Skills Automation
  • Website https://www.zaporizhstal.com
  • Share
  • Project Starting Date

    12.12.2017

  • Project End

    20.12.2017

  • Category

    Metallurgy

The system implementation allowed:

  • improve the reliability of the machine work by applying modern microprocessor-based means of automation and as a consequence, reduced downtime of production equipment and consumption of energy resources through the fault of failures in an outdated control system;
  • increase the productivity of the unit as a whole due to the optimization the cut algorithm;
  • the improved quality and competitiveness of produced goods by increasing the quality of the strip surface (at the stage of development of the system it was required to ensure the accuracy the cut 5 mm over the entire range of lengths of 1400-6000 mm, as a result of the implementation of systems we have the cut the maximum error of 2 mm long pieces and less than 1 mm for short ones);
  • to provide safe and reliable operation of the machine by ensuring the smooth operation of the system in a actually existing electrical fluctuations.
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03
Jun 19

Software and hardware device to set the pace of rolling NTLS-1680

The control system is based on industrial controller for harsh environments made by Schneider Electric (Series Momentum) and which is programmable via tool system Concept V.2.6 +. For all external signals, both incoming and outgoing electrical isolation is provided.

Operator panel by Schneider Electric (XBT series) is used as the indication panel.

Transmission of manufacturing process data in “Coilbox” automated control system is carried out via Modbus RTU protocol.

  • Client JSC "Zaporizhstal"
  • Skills Automation
  • Website https://www.zaporizhstal.com
  • Share
  • Project Starting Date

    12.12.2017

  • Project End

    20.12.2017

  • Category

    Metallurgy

Software and hardware device provides:

  • 24 hours automatic control of the set and the actual pause necessary to return the roll the strip to the original position;
  • periodic output of slabs in the stand DUO according to the work cycle, set by operator;
  • prevention of emergency situations related to the overlap of rolls and double rolls penetration into the stand;
  • reliable and safe operation of equipment.
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03
Jun 19

Hardware-software complex of measuring relative rolling mill 1700-1(2) strip compression

Temper rolling is carried out to improve the surface of the steel, and to produce surface hardening which is significant for sheets undergoing to further cold forming. It is a cold-rolled the strip with the magnitude a relative deformation of 1%.

The complex is intended for measuring relative compression on the temper mill 1700-1 (2) with the possibility of displaying the measured value to the operator and the registration on a paper chart recorder.

  • Client JSC "Zaporizhstal"
  • Skills Automation
  • Website https://www.zaporizhstal.com
  • Share
  • Project Starting Date

    12.12.2017

  • Project End

    20.12.2017

  • Category

    Metallurgy

The following effect was obtained as a result of implementation of the system:

  • improving the reliability of the machine work by applying modern microprocessor-based means of automation and as a consequence, reduced downtime of production equipment due to the failures in an outdated control system;
  • increasing the productivity of the machine by means of fast information providing about the current relative compression without the need to stop and measuring by other means (methods);
  • the improved quality and competitiveness of produced goods by increasing the quality of the strip surface;
  • more efficient use ejector and equipment by reducing the downtime of production equipment and consumption of energy resources through the fault of failures.
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03
Jun 19

The automated control system of the unit of the measuring cut of steel strip

The unit of the measuring cut is a part of the technological chain of the machine PGA 1-4×400-1500 includes leveling machine (LPM) and the lower cut scissors (NNR).

The roll-forming machine works on the process of shaping by piece. The material is rolled steel. The range of sizes of the mill includes bent channels of various configurations: equal channels, furring channels, C-channels, special channels, goffered sheet channels. The leveling machine is located in the line of the roll-forming machine behind the decoiler for rolls and is intended for ultimate straightening band coming from the unwinder. After a leveler the band is delivered to scissors with the lower cut for trimming the front end of the hot rolled strip, and cutting strips on dimensional (> 6 m) length.

As a result of implementing the system employees received convenient and multifunctional tool for the process control, automatic cutting the strip, as well as the ability to control and analyze the archive of technological process parameters.

  • Client JSC "Zaporizhstal"
  • Skills Automation
  • Website https://www.zaporizhstal.com
  • Share
  • Project Starting Date

    12.12.2017

  • Project End

    20.12.2017

  • Category

    Metallurgy

ASM TP has the following features:

  • visualization of the current state of equipment and running of the technological process;
  • automatic cutting of the strip into measured lengths;
  • hand control of mechanisms with full control by means of ASM TP;
  • the mode «Automatic without cut» (is used for particularly important order, where the maximum cut accuracy is required, and the operator visually monitors the cutting of each piece. This automation system measures the desired length, stops and waits for operator commands «Cut»);
  • archiving of the technological process parameters for subsequent analysis in clarifying causes of abnormal situations.
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The structure and composition of the ASM TP

The principle of the automatic control system is a traditional for the industry. The main functions of management and data collection are made by the controller installed in the cabinet process automation. The controller is equipped with the necessary means for electrical isolation and conversion to digital signals from the sensors, as well as for the control actions. According to information channel STA-2 is connected with an industrial workstation located on the mill control board.

Hardware tools as part of ASM TP:

  • the console, which is an industrial workstation with LCD display and functional keyboard (AWS-8120, Advantech);
  • a box for technological automation.

All output and signals are brought in the technological automation box STA-2, which is located in the engine room and has an attached design. In the box signals are sent to the board of normalization and galvanic isolation, than with the help of input boards (Grayhill modules, UNIO-95-5, Fastwel) they are digitized and the obtained values, given to real values (PCA-6144, Advantech), are transmitted by information communication channel to industrial station to displaying and archiving.

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Software

The software of ASM TP is based on the SCADA / HMI system Trace Mode 5. During the work the mnemonic diagram of the technological process of industrial station is displayed on the display. Equipment and its current state is shown schematically on mnemonic diagram. The enabled equipment during its operation is highlighted.

The following process parameters are displayed on the mnemonic diagram:

  • mode of operation APCS;
  • defined speed of the mill;
  • the actual speed of the mill;
  • defined length of the cut;
  • the actual length of the final cut piece;
  • the cut error (in the form of diagram with a color alarm when going beyond the norm);
  • the current length of a measured the strip (intended for the «Automatic without the cut» mode);
  • readiness NNP, magnetic tape transport mechanism;
  • the current position of the scissors.

In addition the software allows you to display industrial station statistical information (number of cut dimensional pieces per hour, shift, day, month), observe the current status of technological process parameters in the form of graphs and record them in a file for later analysis.

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