GB/T 19670-2023Safety of machinery - Prevention of unexpected start-up (English PDF)

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,

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)

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