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AS/NZS 4024.1602:2014


Safety of machinery, Part 1602: Interlocking devices associated with guards — Principles for design and selection

Adopts ISO14119:2013, which specifies principles for the design and selection-independent of the nature of the energy source-of interlocking devices associated with guards.
Published: 30/06/2014
Pages: 68
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Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope
2 Normative references
3 Terms and definitions
4 Operating principles and typical forms of interlocking devices associated with guards
4.1 General
4.2 Principles of guard interlocking without guard locking
4.3 Principles of guard interlocking with guard locking
4.3.1 General
4.3.2 Interlocking device with mechanically operated guard locking
4.3.3 Interlocking device with electromagnetically operated guard locking
5 Requirements for the design and the installation of interlocking devices with and without guard locking
5.1 General
5.2 Arrangement and fastening of position switches
5.3 Arrangement and fastening of actuators
5.3.1 General
5.3.2 Cams
5.4 Actuation modes of interlocking devices
5.5 Interface to control systems
5.6 Mechanical stop
5.7 Additional requirements on guard locking devices
5.7.1 General
5.7.2 Mechanical guard locking device General Locking monitoring
5.7.3 Electromagnetic guard locking device General Locking monitoring Basic measures for minimizing defeat possibilities
5.7.4 Holding force
5.7.5 Supplementary release of guard locking General Escape release of guard locking Emergency release of guard locking Auxiliary release of guard locking
5.7.6 Requirements for fastenings
6 Selection of an interlocking device
6.1 General
6.2 Selection of a guard locking device
6.2.1 Overall system stopping performance and access time
6.2.2 Specific requirements for selection of guard locking devices
6.2.3 Selection of supplementary guard locking releases
6.3 Environmental conditions considerations
6.3.1 General
6.3.2 Influence of dust on Type 2 interlocking devices
7 Design to minimize defeat possibilities of interlocking devices
7.1 General
7.2 Additional measures to minimize defeat possibilities of interlocking devices
8 Control requirements
8.1 General
8.2 Assessment of faults
8.3 Prevention of common cause failures
8.3.1 General
8.3.2 Direct and non-direct mechanical action of the position switches of Type 1 interlocking devices
8.3.3 Power medium diversity
8.4 Release of guard locking device
8.5 Fault exclusion
8.6 Logical series connection of interlocking devices
8.7 Electrical and environmental conditions
8.7.1 General
8.7.2 Performance considerations
8.7.3 Immunity from disturbance
8.7.4 Electrical operating conditions
9 Information for use
9.1 General
9.2 Information for use given by the manufacturer of interlocking devices
9.2.1 Marking
9.2.2 Instructions
9.3 Information for use given by the manufacturer of the machine
9.3.1 Marking
9.3.2 Instructions
Annex A
A.1 Rotary cam
A.1.1 Description
A.1.2 Typical characteristics
A.1.3 Remarks
A.2 Linear cam
A.2.1 Description
A.2.2 Typical characteristics
A.2.3 Remarks
A.3 Hinge
A.3.1 Description
A.3.2 Typical characteristics
A.3.3 Remarks
A.4 Pneumatic/hydraulic interlocking devices
A.4.1 Examples
A.4.2 Remarks
Annex B
B.1 Tongue-actuated position switch
B.1.1 Description
B.1.2 Typical characteristics
B.1.3 Remarks
B.2 Trapped key
B.2.1 Description
B.2.2 Typical characteristics
B.2.3 Remarks
Annex C
C.1 Description
C.2 Typical characteristics
C.3 Remarks
Annex D
D.1 Coded magnetic operated interlocking device
D.1.1 Description
D.1.2 Typical characteristics
D.1.3 Remarks
D.2 Coded RFID-operated interlocking device
D.2.1 Description
D.2.2 Typical characteristics
D.2.3 Remarks
Annex E
E.1 Mechanical interlocking between a movable guard and movable element
E.1.1 Description
E.1.2 Remarks
Annex F
F.1 Example of interlocking device with separate detection of guard position and position of the locking means
F.1.1 Description
F.1.2 Typical characteristic
F.2 Interlocking function ensured by detecting separately guard position and position of the guard locking device
F.2.1 Description
F.2.2 Typical characteristic
F.3 Interlocking function ensured by detecting lock position only by detecting the position of the locking device
F.3.1 Description
F.3.2 Typical characteristic
F.4 Interlocking device with electromagnetic guard locking device
F.4.1 Description
F.4.2 Typical characteristics
F.5 Interlocking device with guard locking, with manually operated delay device
F.5.1 Description
F.5.2 Typical characteristics
F.5.3 Remarks
Annex G
G.1 General
G.2 Example 1 — Category 1
G.2.1 Safety function
G.2.2 Functional description
G.2.3 Design features
G.3 Example 2 — Category 3
G.3.1 Safety functions
G.3.2 Functional description
G.3.3 Design features
G.4 Example 3 — Category 4
G.4.1 Safety function
G.4.2 Functional description
G.4.3 Design features
Annex H
Annex I
Cited references in this standard
Low-voltage switchgear and controlgear — Part 5-8: Control circuit devices and switching elements — Three-position enabling switches
IEC 62061:2012
Safety of machinery — Functional safety of safety-related electrical, electronic and programmable electronic control systems
IEC 60204-1:2009
Safety of machinery — Electrical equipment of machines — Part 1: General requirements
Safety of machinery — Safety-related parts of control systems — Part 2: Validation
Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design
Content history
DR AS/NZS 4024.1602