Commissioning of Industrial Plants

Commissioning involves all measures necessary to transfer an industrial plant from the installation stage into safe and stable operation. This includes:

• Review of technical documentation such as wiring diagrams, manuals, and risk assessments.
• Mechanical and electrical inspections to verify proper installation, cabling, and protective devices.
• Cold commissioning (testing components and controls without product load).
• Hot commissioning (testing under real production conditions with adjustments and fine-tuning).
• Functional and safety tests according to international standards (e.g., EN 60204-1, EN ISO 13849-1, IEC 62061).
• Preparation of commissioning protocols and training of operating staff.
  The process ends with the official handover to the operator once all safety and performance criteria are met.

Commissioning may only be performed by qualified and authorised professionals. Typically, this includes:

• Electrical specialists who perform required inspections of wiring, grounding, and protective systems.
• Mechanical engineers and automation technicians who verify machine functions, safety systems, and control logic.
• External experts or notified bodies (e.g., TÜV, Dekra) when national regulations or the complexity of the plant require third-party validation.
  The operator remains responsible for ensuring that commissioning is carried out by competent persons in compliance with all safety regulations.

No – commissioning and acceptance are distinct steps:

• Commissioning is the technical process of starting up the plant and verifying that it functions safely and in accordance with the specifications.
• Acceptance is a contractual step where the client formally approves the supplier’s performance and confirms that contractual obligations have been met.
• Trial operation may occur before or during commissioning to simulate real production conditions without the plant being officially handed over.

Under the EU Machinery Directive 2006/42/EC (and its successor, the EU Machinery Regulation 2023/1230 applicable from 2027), commissioning is defined as the first intended use of a machine or plant. It may only take place when:

• The machine bears the CE marking.
• A Declaration of Conformity has been issued by the manufacturer.
• All protective devices and safety measures are fully functional.
• The technical documentation is available to authorities on request.
  This ensures that no plant may enter service without meeting EU safety and compliance standards.

At the end of commissioning, the operator must receive a full set of inspection and compliance documents. These typically include:

• CE Declaration of Conformity.
• Risk assessment in accordance with EN ISO 12100.
• Commissioning protocol with detailed test results and signatures of responsible specialists.
• Inspection reports from electrical safety tests (EN 60204-1, DGUV Regulation 3 in Germany).
• Operating, maintenance and service manuals.
• Software and parameter lists if applicable.
• Certificates of training and operator instructions.
  These documents serve both as legal proof of compliance and as practical guidance for safe operation and maintenance.

Virtual commissioning, often based on digital twin technology, offers significant advantages:

• Early error detection: Control logic and processes can be tested virtually before physical assembly, reducing costly rework.
• Reduced on-site commissioning time: Much of the debugging and optimisation is performed in advance.
• Cost efficiency: Downtime, travel, and rework costs are significantly reduced.
• Improved planning reliability: Different scenarios can be simulated to optimise plant performance.
• Enhanced safety: Potential hazards can be identified in the simulation phase without exposing personnel or equipment to risks.

Virtual commissioning has become a best practice in industries such as automotive and high-tech manufacturing, where complex automation requires precise synchronisation.

Commissioning is a critical phase and, if not properly managed, may involve several risks:

• Technical malfunctions due to wiring errors, misaligned components, or software bugs.
• Safety gaps, such as malfunctioning emergency stops, missing interlocks, or inadequate protective devices.
• Delays and project overruns caused by incomplete documentation, supply chain issues, or insufficiently trained staff.
• Unplanned downtime and production losses if issues are only detected after commissioning has started.
• Cybersecurity vulnerabilities, as many modern plants are connected to networks and require IT security measures (IEC 62443).

These risks can be minimised by relying on structured processes, detailed checklists, qualified specialists, and digital simulation methods.