AS/NZS 4024.1603:2019
Safety of machinery - Part 1603: Design of controls, interlocks and guards - Prevention of unexpected start-up
Specifies requirements for designed-in means aimed at preventing unexpected machine start-up (see Clause 3.2) to allow safe human interventions in danger zones (see Annex A). This standard applies to unexpected start-up from all types of energy source, i.e.: (a) power supply, e.g. electrical, hydraulic, pneumatic; (b) stored energy due to, e.g. gravity, compressed springs; and (c) external influences, e.g. from wind. It 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. Identical to and reproduced from ISO 14118:2017.
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AS/NZS 4024.1603:2019 Safety of machinery Design of controls, interlocks and guards - Prevention of unexpected start-up
Preface
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
AMENDMENT CONTROL SHEET
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AS/NZS 4024.1603:2019 Safety of machinery Design of controls, interlocks and guards - Prevention of unexpected start-up
Preface
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
AMENDMENT CONTROL SHEET
AS/NZS 4024.1603:2019
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.