Siemens
СРЕДСТВА ПРОМЫШЛЕННОЙ АВТОМАТИЗАЦИИ
официальный партнер Сименс
Каталог СА01 2016
архивный
(4872) 700-366
skenergo@mail.ru

Technical information

In many industrial and public sectors, explosion protection or explosion hazards are ever-present, e.g. in the chemicals industry, in refineries, on drilling platforms, at petrol stations, in feed manufacturing and in sewage treatment plants.

The risk of explosion is always present when gases, fumes, mist or dust are mixed with oxygen in the air in an explosive ratio close to sources of ignition that are able to release the so-called minimum ignition energy.

In the chemical and petrochemical industries in particular, when crude oil and natural gas are transported, or in mining, milling (e.g. grain and granular solids), this can result in serious injury to persons and damage to equipment.

To ensure maximum safety in these areas, legislators in most countries have implemented appropriate stipulations in the form of laws and regulations based on national and international standards.

Explosion-protected equipment is designed such that an explosion can be prevented when it is used properly.

The explosion-protected equipment can be designed in accordance with various types of protection.

The local conditions must be subdivided into specified zones by the user with the assistance of the responsible authorities in accordance with the frequency of occurrence of an explosion hazard. Device (equipment) categories are assigned to these zones. The zones are then subdivided into possible types of protection and therefore into possible equipment (product) types.

Classification of zones

Areas subject to explosion hazard are divided into zones. Division into zones depends on the chronological and geographical probability of the presence of a hazardous, potentially explosive atmosphere. Information and specifications for classification of the zones are laid down in the following standards:

  • IEC/EN 60079?10?1 for gas atmospheres
  • IEC/EN 60079?10?2 for dust atmospheres

Further, a distinction is made between various explosion groups as well as temperature classes and these are included in the hazard assessment.

Depending on the particular zone and therefore the associated hazard, operating equipment must comply with defined minimum requirements regarding the type of protection. The different types of protection require corresponding measures to prevent ignition that should be implemented at the motor in order to prevent that a surrounding explosive atmosphere is ignited.

Zone

Zone definition acc. to

Gas 1)

Dust 1)

IEC/EN 60079?10?1 for gas atmospheres
IEC/EN 60079?10?2 for dust atmospheres

Assigned types of protection

Category acc.

to 94/9/EC

2

An area in which in normal operation it is expected that an explosive gas atmosphere will occur only rarely and then only briefly.

Ex nA

3G

22

An area in which in normal operation it is expected that an explosive gas atmosphere in the form of a cloud of dust in air will occur only rarely and then only briefly.

Ex tc 2)

3D



1) Motors, which are certified for gas or dust protection, must not be used in hybrid mixtures! Hybrid mixtures: When explosive gas and dust atmospheres occur simultaneously.

2) Motors are not approved for operation in environments containing conductive dust.

Types of protection

Type of protection "Non-sparking" Ex nA acc. to IEC/EN 60079-15

The type of protection Ex nA ensures that a motor in normal operation as well as when operated under deviating conditions as specified in the standard is not in a position to ignite a surrounding explosive gas atmosphere.

Type of protection "Dust explosion protection" Ex tc acc. to IEC/EN 60079-31

This type of protection applies for electrical equipment protected using an enclosure and with limited surface temperature for use in areas in which combustible dust can occur in concentration levels that could cause a fire or an explosion.

Explosion-proof motors for converter-fed operation

Principally, explosion-proof motors can be fed from converters. Particular attention must be paid to the interaction between the motor and converter system, especially with regard to the following aspects:

  • The harmonic content of the supply voltage raises the motor temperature, so the motor output must be reduced (see derating)
  • Less cooling of the motor at speeds below the rated speed
  • Voltage stress on the motor winding
  • Bearing currents
Certification

IEC motors for use in hazardous zones are certified according to the IEC/EN 60079-0, IEC/EN 60079-15 or IEC/EN 60079-31 standards and EC Directive 94/9/EC (ATEX) and are marked according to the following schematic.

Example "explosion-proof enclosure":

CE

0158

Ex

II

2

G

Ex

de

IIC

T4

X

CE marking

?

Number of the certifying "notified" body (e.g. 0158 = EXAM)
(not Zones 2, 22)

?

Explosion protection marking (symbol)

?

Device group:

I  = Underground
II = All other areas

?

Category Part 1 (zone):

1 (Zone 0/20),
2 (Zone 1/21),
3 (Zone 2/22)

?

Category Part 2 (Ex atmosphere)

G = Gas
D = Dust

?

Explosion protected equipment

 

?

Type of protection (e.g. nA or tc)

 

?

Explosion group and explosion subgroup

II = Gas (IIA, IIB or IIC)
III = Dust (IIIA, IIIB or IIIC)

?

Temperature class or max. surface temperature

T1 = 450 °C
T2 = 300 °C
T3 = 200 °C
T1 = 25 °C

?

Special conditions according to the operating instructions or EC type examination certificate

?



Additional information on the subject of explosion protection, types of protection and zones is provided in the Siemens brochure "Explosion Protection".

Overview of SIMOTICS FD 1MM, 1MH, 1MQ, 1MN explosion-proof motors

SIMOTICS FD explosion-proof motors (1MM, 1MH, 1MQ, 1MN) correspond to the SIMOTICS FD non-explosion-proof motors (1LM, 1LH, 1LQ, 1LN). All technical specifications can be found in the selection and ordering data for the non-Ex motors 1LM, 1LH, 1LQ, 1LN (sections 4 to 7 of the catalog), whereby the rated output is subjected to derating in accordance with defined factors. For derating factors, see "Technical specifications" section "Derating".

To order explosion-proof motors, the letter "L" in position 2 of the Article No. for non-Ex motors must be replaced with the letter "M".

The table below contains a complete overview of our explosion-proof motors, their types of protection and their assignment to categories. It is important to note that depending on whether the motor is used for converter-fed operation or mains-fed operation, different order codes are required for unique selection of the required motor.

Sector

Cate­
gory

Zone

Frequency of occurrence of the Ex atmosphere

Type of

protection

Temperature class, max. surface temperature

Degree of protection

Motor type (pos. 1-4 of Article No.)

Operation

Order code

Utilization according to thermal class

Standard

Gases and vapors (G)

3G

2

rarely or briefly

Ex nA IIC
(Non?Sparking)

T1 – T3

IP55

1MM1
1MH1
1MQ1
1MN1


Mains(1MH1)

M72

130 (B)
155 (B)

IEC/EN 60079?0

IEC/EN 60079?15

Converter

M73

  

Dust (D)

3D

22

rarely or briefly

Ex tc IIIB
(non-conductive dust)

T125°C

IP55

1MM1
1MH1
1MQ1
1MN1


Mains(1MH1)

M35

130 (B)
155 (B)

IEC/EN 60079?0
IEC/EN 60079?31

Converter

M39



















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Арматура DENDOR

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Датчики и измерители

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Регуляторы и регистраторы

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Пневматическое оборудование

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Краны и Клапаны

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Измерительные приборы

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Системы беспроводного управления «умный дом»

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Бесконтактные выключатели Конечные выключатели Оптические датчики Энкодеры

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SKW-FS - Установка умягчения

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SKW-FK - Установка обезжелезивания
Каталог оборудования 2016
Каталог продуктов Siemens Industry Приводная техника Преобразователи Двигатели переменного тока Низковольтные электродвигатели (стандартные промышленные двигатели) Введение Стандартные электродвигатели IEC Нестандартные электродвигатели, размера 315 и выше Ex электродвигатели Двигатели для определенных секторов промышленности Приложения IEC двигатели Рекомендованные и экспресс двигатели SIMOTICS GP двигатели общего назначения SIMOTICS SD Двигатели для тяжелых условий работы SIMOTICS DP Двигатели специального применения SIMOTICS FD Введение Technical Information System Components Self-ventilated motors – enclosed version Forced-air cooled motors – enclosed version Water-cooled motors with water-jacket cooling Water-cooled motors with air-to-water heat exchanger Self-ventilated motors – open version Forced-air cooled motors – open version Explosion-proof motors Technical information 1MM1 motors for converter-fed operation 1MQ1 motors for converter-fed operation 1MH1 motors for converter-fed operation 1MH1 motors for mains-fed operation 1MN1 motors for converter-fed operation Dimensions Article No. supplements and special versions Application-specific motors Нестандартные двигатели SIMOTICS HT Двигатели с большим крутящим моментом SIMOTICS XP Взрывозащищенные двигатели Серводвигатели и двигатели главного движения Высоковольтные двигатели Двигатели постоянного тока Система измерения SIMODRIVE sensor Системы измерения Мотор-редукторы Flender Gear Units Couplings Инструментальное программное обеспечение Дополнительные компоненты Техника автоматизации Автоматизация и безопасность зданий Низковольтная коммутационная техника Технология безопасности Системные решения и продукты для отраслей Сервис ... и все, что Вам еще необходимо




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