GB/T 19670-2023 PDF English
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Safety of machinery - Prevention of unexpected start-up
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.110
CCS J 09
GB/T 19670-2023 / ISO 14118:2017
Replacing GB/T 19670-2005
Safety of machinery - Prevention of unexpected start-up
(ISO 14118:2017, IDT)
ISSUED ON: SEPTEMBER 07, 2023
IMPLEMENTED ON: SEPTEMBER 07, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 8
4 General measures to prevent unexpected start-up ... 9
4.1 General requirements ... 9
4.2 Manual measures for isolation and energy dissipation ... 9
4.3 Other means to prevent unexpected (unintended) start-up ... 10
4.4 Signalling and warning (delayed start-up) ... 10
5 Isolation and energy dissipation ... 10
5.1 Prevention of unexpected start-up upon restoration of any power supplies ... 10
5.2 Devices for isolation from power supplies ... 11
5.3 Locking (securing) devices ... 12
5.4 Devices for stored-energy dissipation or restraint (containment) ... 12
6 Other measures to prevent unexpected start-up ... 13
6.1 Design strategy ... 13
6.2 Measures to prevent unintended generation of start commands ... 14
6.3 Measures to maintain stop commands ... 15
6.4 Automatic monitoring of the safe state (stopped condition) during a category 2 stop 17
7 Design requirements for verification ... 17
7.1 General requirements ... 17
7.2 Provisions for verifying isolation ... 17
7.3 Provisions for verifying energy dissipation or restraint (containment) ... 18
Annex A (informative) Examples of tasks which can require the presence of persons in
danger zones ... 19
Bibliography ... 20
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
“Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents”.
This document replaces GB/T 19670-2005 “Safety of machinery - Prevention of
unexpected start-up”. Compared with GB/T 19670-2005, in addition to structural
adjustments and editorial changes, the main technical changes are as follows:
- MODIFY the scope of the standard (see Clause 1 of this document, Clause 1 of the
2005 edition);
- ADD the general requirements for general measures to prevent unexpected start-
up (see 4.1 of this document);
- MODIFY other means to prevent unexpected start-up (see 4.3 of this document,
4.2 of the 2005 edition);
- ADD the requirements for preventing unexpected start-up by signalling and
warning (delayed start) (see 4.4 of this document);
- ADD the general requirements for prevention of unexpected start-up upon
restoration of any power supplies (see 5.1 of this document);
- MODIFY the requirements for locking (securing) devices (see 5.3 of this document,
5.2 of the 2005 edition);
- MODIFY the requirements for maintained stop command of level A, level B, and
level C (see 6.3.2 and 6.3.3 of this document, 6.3.2 and 6.3.3 of the 2005 edition).
This document is identical to ISO 14118:2017 “Safety of machinery - Prevention of
unexpected startup”.
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority of this document shall not be held
responsible for identifying any or all such patent rights.
This document was proposed by and shall be under the jurisdiction of National
Technical Committee on Safety of Machinery of Standardization Administration of
China (SAC/TC 208).
Drafting organizations of this document: Suzhou Rhine Precision Alloy Co., Ltd.,
Guangzhou Fengqiao Intelligent Equipment Co., Ltd., Hiecise Precision Equipment
(Kunshan) Co., Ltd., Xiamen Weihaotai Technology Co., Ltd., Yangzhou Runying
Machinery Co., Ltd., Huzhou Nanxun District Baitong Standardization Research
Institute, Beijing Aerospace Xinli Technology Co., Ltd., Zhejiang Boda Industry and
Safety of machinery - Prevention of unexpected start-up
1 Scope
This document 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).
This document 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.
This document 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.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 15706-2012 Safety of machinery - General principles for design - Risk
assessment and risk reduction (ISO 12100:2010, IDT)
ISO 12100 Safety of machinery - General principles for design - Risk assessment
and risk reduction
ISO 13849-1 Safety of machinery - Safety-related parts of control systems - Part 1:
General principles for design
NOTE: GB/T 16855.1-2018 Safety of machinery - Safety-related parts of control systems - Part
1: General principles for design (ISO 13849-1:2015, IDT)
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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