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STG91 Ltd. Automation company

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About Us

STG91 Ltd is an engineering company specializing in the development of industrial and managed software solutions, PLC and SCADA programming, as well as in the design and construction of electrical panels and monitoring and control stations.
Our mission is to provide reliable and efficient automation systems, support businesses in their digital transformation, optimize production, and provide security and safety.By combining engineering expertise, innovation and extensive experience, we provide all technological solutions tailored to the specific needs of each client.

Learn more

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Technological and innovative tone

We combine precision engineering, advanced technologies and extensive experience to provide solutions for automation, increased efficiency, reliability and sustainability at every level of production.

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Our Projects

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Automation in the production of boutique flours

Control systems in pellet production

SCADA system for asphalt plant control

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Automatic system for the production of liquid fertilizers

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Development of electronic production logs for various industries

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Dosing system for Big Bag

Our services

Professional installation of instrumentation and control equipment.

Siemens automation systems

Дългогодишният опит в автоматизацията на Siemens създава интелигентни и надеждни решения за индустриални и търговски обекти. Работим с контролери, HMI панели, SCADA системи и честотни преобразуватели на Siemens, за да осигурим оптимална производителност, стабилна интеграция и безпроблемна работа на вашето оборудване. Нашият екип от специалисти проектира, настройва и поддържа системи, съобразени изцяло с нуждите на вашия бизнес, като повишена ефективност, безопасност и дългосрочна устойчивост на процеса.

Configuration of frequency converters

Programming, adjustment, and optimization of VFD devices for precise control of electric motors in industrial and commercial applications. We configure both basic and advanced parameters, including operating frequency, acceleration and deceleration, torque, PID controllers, protective functions, and communication protocols (Modbus, Profibus, Profinet, etc.). We perform load testing, energy efficiency verification, adaptation to the specifics of the technological process, and final fine-tuning to achieve maximum performance and reliable, trouble-free operation. Our professional approach ensures optimal equipment operation, reduced energy consumption, and extended system lifespan.

Service and maintenance of automation systems

We provide diagnostics, preventive maintenance, repair, and optimization of automated solutions for industrial and commercial facilities. With a fast response approach, professional service, and tailored support, we ensure long-term reliability and maximum efficiency of your automated processes.

Design and implementation of automation systems

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Our company specializes in the design, implementation, and full integration of automation systems to enhance the efficiency and safety of your processes. We deliver modern solutions tailored to the needs of industrial, commercial, and manufacturing facilities, optimizing operations, reducing costs, and ensuring reliability at every stage.

Design and construction of electrical control panels

Professional design and construction of electrical control panels for industrial facilities.
We provide complete solutions—from preparing the technical design to full wiring, installation, and commissioning.

Industrial Analysis and Consultation

We offer comprehensive industrial analysis focused on identifying failures, breakdowns, and their root causes to enhance the reliability of production systems. We assess energy efficiency and optimize costs through the analysis of processes, equipment, and operational modes. Based on the collected data, we develop specific technical and software solutions to improve productivity and automation. Our approach helps reduce downtime, increase quality, and support sustainable development in manufacturing.