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AS/NZS 4024.1603:2019
[Current]Safety of machinery, Part 1603: Design of controls, interlocks and guards — Prevention of unexpected start-up
The objective of this Standard is to specify requirements for designed-in means aimed at preventing unexpected machine start-up to allow safe human interventions in danger zones.
Published: 26/07/2019
Pages: 11
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
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
5.2.1
5.2.2
5.2.3
5.3 Locking (securing) devices
5.4 Devices for stored-energy dissipation or restraint (containment)
5.4.1 General
5.4.1.1
5.4.1.2
5.4.1.3
5.4.1.4
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)
7.3.1
7.3.2
7.3.3
Annex A
Amendment control sheet
AS/NZS 4024.1603:2019
Amendment No. 1 (2020)
Correction
Bibliography
Cited references in this standard
[Current]
Safety of machinery - Functional safety of safety-related control systems
[Current]
Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design
[Current]
Safety of machinery — General principles for design — Risk assessment and risk reduction
Content history
[Current]
[Current]
[Superseded]
[Superseded]
DR AS/NZS 4024.1603:2019
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