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ISO 22201-2 1st Edition, March 15, 2013 Lifts (elevators), escalators and moving walks - Programmable electronic systems in safety related applications - Part 2: Escalators and moving walks (PESSRAE)
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Description / Abstract:
This International Standard is applicable to the product family
of escalators and moving walks used in residential buildings,
offices, hospitals, hotels, industrial plants, etc. It covers those
aspects that need to be addressed when programmable electronic
systems are used to carry out electric safety functions for
escalators and moving walks (PESSRAE). This International Standard
is applicable for escalator and moving walk safety funcitons that
are identified in escalator and moving codes, standards, or laws
that reference This International Standard, or laws that reference
this This International Standard for PESSRAE application. The
safety integrity levels (SILs) specified in ISO 22201-2:2013 are
understood to be valid for PESSRAE application in the context of
the referenced escalator and moving walk codes, standards, and laws
in Annex B.
This International Standard is also applicable for the
application of PESSRAE that are new or deviate from those described
in this International Standard
The requirements of this International Standard regarding
electrical safety/protective devices are such that the possibility
of a failure of an electric safety/protective device complying with
all the requirements of the standard needs not to be taken into
consideration.
In particular, this International Standard
a) uses safety integrity levels (SIL) for specifying the target
failure rate for the safety functions to be implemented by the
PESSRAE;
b) specifies the requirements for achieving safety integrity for
a function but does not specify who is responsible for implementing
and maintaining the requirements (for example, designers,
suppliers, owner/operating company, contractor); this
responsibility is assigned to different parties according to safety
planning and national regulations;
c) applies to PES used in escalator and moving walk applications
that meet the minimum requirements of a recognized escalator and
moving walk standards such as EN 115, ASME A17.1/CSA B44, or
escalator and moving walk laws such as The Japan Building Standard
Law Enforcement Order For Elevator and Escalator;
d) defines the relationship between this International Standard
and IEC 61508 and defines the relationship between this
International Standard and the EMC Standard for Escalators and
moving walks on immunity, ISO 22200;
e) outlines the relationship between escalator and moving walk
safety functions and their safe-state conditions;
f) applies to phases and activities that are specific to design
of hardware and software but not those phases and activities which
occur post design, for example sourcing and manufacturing;
g) requires the manufacturer of the PESSRAE to provide
instructions that specify what is necessary to maintain the
integrity of the PESSRAE (instruction manual) for organization
carrying out the assembly, connections, adjustment and maintenance
of the escalators and moving walks;
h) provides requirements relating to the hardware and software
safety validation;
i) establishes the safety integrity levels for specific
escalator and moving walk safety functions;
j) specifies techniques/measures required for achieving the
specified safety integrity levels;
k) defines a maximum level of performance (SIL 3) which can be
achieved for a PESSRAE according to this International Standard and
defines a minimum level of performance (SIL 1).
This International Standard does not cover:
a) hazards arising from the PES equipment itself such as
electric shock etc.;
b) the concept of fail-safe that may be of value when the
failure modes are well defined and the level of complexity is
relatively low. The concept of fail-safe was considered
inappropriate because of the full range of complexity of PESSRAE
that are within the scope of this International Standard;
c) other relevant requirements necessary for the complete
application of a PESSRAE in a escalator and moving walk safety
function such as system integration specifications, temperature and
humidity, the mechanical construction, mounting and labelling of
switches, actuators, or sensors that contain PESSRAE. These
requirements are to be carried out in accordance with the national
escalator and moving walk norm that references this International
Standard.