ISO 7176-21:2009
(Main)Wheelchairs — Part 21: Requirements and test methods for electromagnetic compatibility of electrically powered wheelchairs and scooters, and battery chargers
Wheelchairs — Part 21: Requirements and test methods for electromagnetic compatibility of electrically powered wheelchairs and scooters, and battery chargers
ISO 7176-21:2009 specifies requirements and test methods for electromagnetic emissions and for electromagnetic immunity of electrically powered wheelchairs and scooters with a maximum speed of not more than 15 km/h intended for indoor and/or outdoor use by people with disabilities. It is also applicable to manual wheelchairs with an add-on power kit. It is not applicable to vehicles designed to carry more than one person. ISO 7176-21:2009 also specifies requirements and test methods for the electromagnetic compatibility of battery chargers intended for use with electrically powered wheelchairs and scooters.
Fauteuils roulants — Partie 21: Exigences et méthodes d'essai pour la compatibilité des fauteuils roulants électriques et scooters motorisés
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 7176-21
Second edition
2009-04-01
Wheelchairs —
Part 21:
Requirements and test methods for
electromagnetic compatibility of
electrically powered wheelchairs and
scooters, and battery chargers
Fauteuils roulants —
Partie 21: Exigences et méthodes d'essai pour la compatibilité des
fauteuils roulants électriques et scooters motorisés
Reference number
©
ISO 2009
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ii © ISO 2009 – All rights reserved
Contents Page
Foreword. iv
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Classification of electrically powered wheelchairs. 4
5 Requirements . 4
5.1 General. 4
5.2 Wheelchair drives . 4
5.3 Wheelchairs with an on-board battery charger . 6
5.4 Off-board and carry-on battery chargers . 8
6 Test apparatus . 9
7 Preparation . 10
7.1 Wheelchairs – driving. 10
7.2 Wheelchairs – non-driving. 11
7.3 Wheelchairs with on-board battery chargers . 11
7.4 Off-board and carry-on battery chargers .11
8 Sequence of tests . 11
9 Test methods for emissions . 11
9.1 Mains terminal disturbances . 11
9.2 Radiated emissions . 12
9.3 Harmonic current emissions . 12
9.4 Voltage fluctuations and flicker . 12
10 Test methods for immunity. 13
10.1 Electrostatic discharge immunity . 13
10.2 Radiated r.f. field immunity. 14
10.3 Fast transient/burst immunity . 17
10.4 Surge immunity. 17
10.5 Conducted disturbance immunity. 18
10.6 Power frequency magnetic field immunity. 18
10.7 Voltage dips and short interruptions immunity. 18
11 Wheel speed change calculations . 19
12 Test report . 20
13 Disclosure. 20
14 User manual . 20
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 7176-21 was prepared by Technical Committee ISO/TC 173, Assistive products for persons with disability,
Subcommittee SC 1, Wheelchairs.
This second edition cancels and replaces the first edition (ISO 7176-21:2003), which has been technically
revised.
ISO 7176 consists of the following parts, under the general title Wheelchairs:
⎯ Part 1: Determination of static stability
⎯ Part 2: Determination of dynamic stability of electric wheelchairs
⎯ Part 3: Determination of effectiveness of brakes
⎯ Part 4: Energy consumption of electric wheelchairs and scooters for determination of theoretical distance
range
⎯ Part 5: Determination of dimensions, mass and manoeuvring space
⎯ Part 6: Determination of maximum speed, acceleration and deceleration of electric wheelchairs
⎯ Part 7: Measurement of seating and wheel dimensions
⎯ Part 8: Requirements and test methods for static, impact and fatigue strengths
⎯ Part 9: Climatic tests for electric wheelchairs
⎯ Part 10: Determination of obstacle-climbing ability of electrically powered wheelchairs
⎯ Part 11: Test dummies
⎯ Part 13: Determination of coefficient of friction of test surfaces
⎯ Part 14: Power and control systems for electrically powered wheelchairs and scooters — Requirements
and test methods
iv © ISO 2009 – All rights reserved
⎯ Part 15: Requirements for information disclosure, documentation and labelling
⎯ Part 16: Resistance to ignition of upholstered parts — Requirements and test methods
⎯ Part 19: Wheeled mobility devices for use as seats in motor vehicles
⎯ Part 21: Requirements and test methods for electromagnetic compatibility of electrically powered
wheelchairs and scooters, and battery chargers
⎯ Part 22: Set-up procedures
⎯ Part 23: Requirements and test methods for attendant-operated stair-climbing devices
⎯ Part 24: Requirements and test methods for user-operated stair-climbing devices
⎯ Part 26: Vocabulary
A Technical Report (ISO/TR 13570-1, Wheelchairs — Part 1: Guidelines for the application of the ISO 7176
series on wheelchairs) is also available, giving information on how to use the ISO 7176 standards when
selecting a wheelchair and helping readers to understand the purpose for, and content of, the International
Standards on wheelchairs.
Introduction
Electrically powered wheelchairs and their battery chargers are meant to operate without introducing
significant electromagnetic disturbances into the environment and without significant degradation of
operational performance in the presence of electromagnetic disturbances expected in normal use.
Wheelchairs are often used near roads and therefore should be immune to radio frequency fields from both
static and mobile communications equipment, as well as from other sources of electromagnetic disturbance.
Injury could occur in the event of unintentional movement or change in direction of movement of a wheelchair.
This part of ISO 7176 specifies requirements and test methods for wheelchairs and their battery chargers to
minimize the risks associated with their exposure to reasonably foreseeable electromagnetic interference and
electrostatic discharge and with their production of electromagnetic fields that could impair the operation of
other devices or equipment in their usual environment.
The upper frequency limit and test level for radiated r.f. immunity requirements are selected according to the
environment in which the wheelchair is used and the related risk. Hence the requirements for a wheelchair
while it is driving are consistent with its use as a medical device, but the requirements for charging are
consistent with use of the wheelchair and charger as domestic electrical equipment.
vi © ISO 2009 – All rights reserved
INTERNATIONAL STANDARD ISO 7176-21:2009(E)
Wheelchairs —
Part 21:
Requirements and test methods for electromagnetic
compatibility of electrically powered wheelchairs and scooters,
and battery chargers
WARNING — This part of ISO 7176 calls for the use of procedures that can be hazardous if adequate
precautions are not taken. It refers only to technical suitability and does not absolve the manufacturer
or test house from any legal obligations relating to health and safety.
1 Scope
This part of ISO 7176 specifies requirements and test methods for electromagnetic emissions and for
electromagnetic immunity of electrically powered wheelchairs and scooters with a maximum speed of not
more than 15 km/h intended for indoor and/or outdoor use by people with disabilities. It is also applicable to
manual wheelchairs with an add-on power kit. It is not applicable to vehicles designed to carry more than one
person.
This part of ISO 7176 also specifies requirements and test methods for the electromagnetic compatibility of
battery chargers intended for use with electrically powered wheelchairs and scooters.
A reference configuration is specified for adjustable wheelchairs and scooters in order to enable test results to
be used for comparison of performance.
NOTE The term “wheelchair” is used in this part of ISO 7176 to cover electrically powered wheelchairs, scooters and
manual wheelchairs with an add-on power kit.
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.
ISO 7176-5, Wheelchairs — Part 5: Determination of dimensions, mass and manoeuvring space
ISO 7176-9, Wheelchairs — Part 9: Climatic tests for electric wheelchairs
ISO 7176-15, Wheelchairs — Part 15: Requirements for information disclosure, documentation and labelling
ISO 7176-22, Wheelchairs — Part 22: Set-up procedures
IEC 61000-3-2, Electromagnetic compatibility (EMC) — Part 3-2: Limits — Limits for harmonic current
emissions (equipment input current u 16 A per phase)
IEC 61000-3-3, Electromagnetic compatibility (EMC) — Part 3-3: Limits — Limitation of voltage ch
...
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