AS 4024.1602-2006

1 - AS 4024.1602-2006 SAFETY OF MACHINERY - INTERLOCKING DEVICES ASSOCIATED WITH GUARDS-PRINCIPLES FOR DESIGN AND SELECTION
4 - PREFACE
5 - CONTENTS
6 - 1 SCOPE
6 - 2 OBJECTIVE
6 - 3 REFERENCED DOCUMENTS
7 - 4 DEFINITIONS
7 - 4.1 Access time; time for access to a danger zone
7 - 4.2 Automatic monitoring
7 - 4.3 Guard locking device
7 - 4.4 Interlocking device; interlock
7 - 4.5 Interlocking guard
7 - 4.6 Interlocking guard with guard locking
8 - 4.7 Positive mode actuation
8 - 4.8 Positive opening operation of a contact element
8 - 4.9 Stopping time; time for hazard elimination
8 - 5 OPERATING PRINCIPLES AND TYPICAL FORMS OF INTERLOCKING DEVICES ASSOCIATED WITH GUARDS
8 - 5.1 Interlocking principles
8 - 5.1.1 Control interlocking
8 - 5.1.2 Power interlocking
9 - 5.2 Typical forms of interlocking devices
9 - 5.2.1 Interlocking device (without guard locking) (see Figure 3(a) and Figure 4)
10 - 5.2.2 Interlocking device with guard locking (see Figure 3(b) and Figure 4)
12 - 5.3 Technological forms of interlocking device
13 - 6 PROVISIONS FOR THE DESIGN OF INTERLOCKING DEVICES (INDEPENDENT OF THE NATURE OF THE ENERGY SOURCE)
13 - 6.1 Actuation modes of mechanically actuated position detectors
14 - 6.2 Arrangement and fastening of position detectors
15 - 6.3 Arrangement and fastening of cams
15 - 6.4 Reducing the possibility of common-cause failures
15 - 6.4.1 General
15 - 6.4.2 Positive and non-positive mode association of mechanically actuated position detectors (see Clause 6.1)
15 - 6.4.3 Power medium diversity
16 - 6.5 Guard locking device (see Clauses 4.3 and 5.2.2)
16 - 6.6 Delay devices
16 - 6.7 Design to minimize defeat possibilities
16 - 6.7.1 General
16 - 6.7.2 Design to minimize defeat of mechanically actuated position detectors
17 - 6.7.3 Design to minimize defeat of proximity switches and magnetic switches
18 - 6.7.4 Design to minimize defeat of plug and socket interlocking devices
18 - 6.8 Environmental considerations
18 - 7 ADDITIONAL TECHNOLOGICAL REQUIREMENTS FOR ELECTRICAL INTERLOCKING DEVICES
18 - 7.1 Compliance with AS 60204.1
18 - 7.2 Interlocking devices incorporating mechanically actuated position switches
18 - 7.2.1 Interlocking devices incorporating one single mechanically actuated position switch
18 - 7.2.2 Interlocking devices incorporating two mechanically actuated position switches
19 - 7.3 Interlocking devices incorporating non-mechanically actuated position switches (proximity switches and magnetic...
19 - 7.3.1 General
19 - 7.3.2 Equivalence with mechanically actuated position switches
19 - 7.3.3 Immunity from disturbance
19 - 7.3.4 Mutual influencing
19 - 7.3.5 Electrical operating conditions
19 - 7.3.6 Specific provisions for magnetic switches
19 - 8 SELECTION OF AN INTERLOCKING DEVICE
19 - 8.1 General
20 - 8.2 Conditions of use and intended use
20 - 8.3 Risk assessment
20 - 8.4 Stopping time and access time
20 - 8.5 Frequency of access (frequency of opening the guard for access to the danger zone)
20 - 8.5.1 Selection of interlocking device
20 - 8.5.2 Interlocking devices with automatic monitoring
21 - 8.6 Performance considerations
22 - APPENDIX A - GUARD-OPERATED INTERLOCKING DEVICE WITH ONE CAM-OPERATED POSITION DETECTOR
22 - A1 PRINCIPLE
23 - A2 ADVANTAGES
23 - A3 DISADVANTAGE
23 - A4 REMARKS
24 - APPENDIX B - GUARD-OPERATED INTERLOCKING DEVICE WITH TONGUE-OPERATED SWITCH
24 - B1 PRINCIPLE
24 - B2 ADVANTAGES
24 - B3 DISADVANTAGE
24 - B4 REMARK
26 - APPENDIX C - PLUG AND SOCKET INTERLOCKING DEVICE (PLUG/SOCKET COMBINATION)
26 - C1 PRINCIPLE
26 - C2 ADVANTAGE
26 - C3 DISADVANTAGES
28 - APPENDIX D - GUARD-OPERATED INTERLOCKING DEVICE INCORPORATING TWO CAM-OPERATED POSITION DETECTORS
28 - D1 PRINCIPLE
28 - D2 ADVANTAGES
28 - D3 REMARK
30 - APPENDIX E - ELECTRICAL INTERLOCKING DEVICE INCORPORATING MAGNETICALLY ACTUATED (MAGNETIC) SWITCHES
30 - E1 PRINCIPLE
30 - E2 ADVANTAGES
30 - E3 DISADVANTAGES
30 - E4 REMARKS
31 - APPENDIX F - ELECTRICAL INTERLOCKING DEVICE INCORPORATING TWO PROXIMITY DETECTORS
31 - F1 PRINCIPLE
31 - F2 ADVANTAGES
31 - F3 DISADVANTAGES
32 - F4 REMARKS
33 - APPENDIX G - PNEUMATIC/HYDRAULIC INTERLOCKING DEVICES
33 - G1 INTRODUCTION
34 - G2 REMARK
35 - APPENDIX H - INTERLOCKING DEVICE WITH GUARD LOCKING, WITH MANUALLY OPERATED DELAY DEVICE
35 - H1 PRINCIPLE
35 - H2 ADVANTAGE
36 - APPENDIX I - DIRECT (MECHANICAL) INTERLOCKING BETWEEN GUARD AND START/STOP MANUAL CONTROL
36 - I1 PRINCIPLE (see Figure I1)
36 - I2 ADVANTAGE
36 - I3 REMARK
38 - APPENDIX J - CAPTIVE-KEY INTERLOCKING DEVICE
38 - J1 DESCRIPTION
38 - J2 PRINCIPLE
38 - J3 ADVANTAGES
39 - J4 REMARKS
40 - APPENDIX K - TRAPPED-KEY INTERLOCKING DEVICE
40 - K1 PRINCIPLE
40 - K2 ADVANTAGES
41 - K3 DISADVANTAGES
41 - K4 REMARK
42 - APPENDIX L - MECHANICAL INTERLOCKING BETWEEN A GUARD AND A MOVABLE ELEMENT
42 - L1 PRINCIPLE
42 - L2 REMARKS
43 - APPENDIX M - INTERLOCKING DEVICE WITH SPRING-APPLIED/POWER-RELEASED GUARD LOCKING DEVICE
43 - M1 VARIANT A: INTERLOCKING FUNCTION ENSURED BY DETECTING SEPARATELY GUARD POSITION AND LOCK POSITION
43 - M2 VARIANT B: INTERLOCKING FUNCTION ENSURED BY DETECTING LOCK POSITION ONLY
44 - M3 REMARK (VALID FOR BOTH VARIANTS)

Specifies principles for the design and selection of interlocking devices associated with guards. The principles are independent of the energy sources used on the machine.

This Standard specifies principles for the design and selection, independent of the nature of the energy source, of interlocking devices associated with guards (as defined in AS 4024.1201).It also provides requirements specifically intended for electrical interlocking devices (see Clause 7).This Standard covers the parts of guards which actuate interlocking devices.Requirements for guards are given in AS 4024.1601. The processing of the signal from the interlocking device to stop and immobilize the machine is dealt with in AS 4024.1501.

Originated as part of AS 4024.1(Int)-1992.
Previous edition part of AS 4024.1-1996.
Revised in part and redesignated as AS 4024.1602-2006.