ISO 14118:2017
Safety of machinery — Prevention of unexpected start-up
ISO 14118:2017 specifies requirements for designed-in means aimed at preventing unexpected machine start-up (see 3.2) to allow safe human interventions in danger zones (see Annex A).
ISO 14118:2017 applies to unexpected start-up from all types of energy source, i.e.:
- power supply, e.g. electrical, hydraulic, pneumatic;
- stored energy due to, e.g. gravity, compressed springs;
- external influences, e.g. from wind.
ISO 14118:2017 does not specify performance levels or safety integrity levels for safety-related parts of control systems. While available means to prevent unexpected start-up are identified, this document does not specify the means for the prevention of unexpected machine start-up for specific machines.
NOTE A type-C standard can define the required means for the prevention of harm arising from unexpected start-up. Otherwise, the requirements for a specific machine need to be determined by risk assessment outside the scope of this document.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General measures to prevent unexpected start-up
4.1 General
4.2 Manual measures for isolation and energy dissipation
4.3 Other means to prevent unexpected (unintended) start-up
4.4 Signalling and warning (delayed start)
5 Isolation and energy dissipation
5.1 Prevention of unexpected start-up upon restoration of any power supplies
5.2 Devices for isolation from power supplies
5.3 Locking (securing) devices
5.4 Devices for stored-energy dissipation or restraint (containment)
5.4.1 General
5.4.2 Mechanical elements
5.4.3 Locking or securing facilities for the restraint (containment) devices
6 Other measures to prevent unexpected start-up
6.1 Design strategy
6.2 Measures to prevent unintended generation of start commands
6.2.1 Measures to prevent unintended actuation of manual start controls
6.2.2 Design of safety-related parts of the control system
6.2.3 Selection and location of power control elements
6.3 Measures to maintain stop commands
6.3.1 Principle
6.3.2 Maintained stop command generated by a stop control device (level A)
6.3.3 Maintained stop command generated by machine control (level B/C)
6.3.4 Mechanical disconnection (level D; see Figure 1)
6.3.5 Moving-part immobilization (level E; see Figure 1)
6.4 Automatic monitoring of the safe state (stopped condition) during a category 2 stop
7 Design requirements for verification
7.1 General
7.2 Provisions for verifying isolation
7.3 Provisions for verifying energy dissipation or restraint (containment)
Annex A (informative) Examples of tasks which can require the presence of persons in danger zones
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General measures to prevent unexpected start-up
4.1 General
4.2 Manual measures for isolation and energy dissipation
4.3 Other means to prevent unexpected (unintended) start-up
4.4 Signalling and warning (delayed start)
5 Isolation and energy dissipation
5.1 Prevention of unexpected start-up upon restoration of any power supplies
5.2 Devices for isolation from power supplies
5.3 Locking (securing) devices
5.4 Devices for stored-energy dissipation or restraint (containment)
5.4.1 General
5.4.2 Mechanical elements
5.4.3 Locking or securing facilities for the restraint (containment) devices
6 Other measures to prevent unexpected start-up
6.1 Design strategy
6.2 Measures to prevent unintended generation of start commands
6.2.1 Measures to prevent unintended actuation of manual start controls
6.2.2 Design of safety-related parts of the control system
6.2.3 Selection and location of power control elements
6.3 Measures to maintain stop commands
6.3.1 Principle
6.3.2 Maintained stop command generated by a stop control device (level A)
6.3.3 Maintained stop command generated by machine control (level B/C)
6.3.4 Mechanical disconnection (level D; see Figure 1)
6.3.5 Moving-part immobilization (level E; see Figure 1)
6.4 Automatic monitoring of the safe state (stopped condition) during a category 2 stop
7 Design requirements for verification
7.1 General
7.2 Provisions for verifying isolation
7.3 Provisions for verifying energy dissipation or restraint (containment)
Annex A (informative) Examples of tasks which can require the presence of persons in danger zones
Bibliography