Simotics XP Explosion Proof Motors
Simotics XP Ex n, Ex t(D) ( 1MB1, 1LA, 1LG)
Simotics XP Ex n, Ex t(D) ( 1MB1, 1LA, 1LG)

 

Simotics XP Ex n, Ex t(D) ( 1MB1, 1LA, 1LG)

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Description

1MB1, 1LA, 1LG4, 1LG6
NON-SPARKING Ex nA II for zone 2, dust Zone 21/22
Ex t, Ex tD
SIEMENS EXPLOSION PROOF
SIMOTICS XP
ATEX MOTOR
ALUMINIUM - 1LA7, 1LA5, 1LA9 ( with High efficiency IE2, American Market, NEMA EPACT )
CAST IRON - 1LA6, 1LG4, 1LG6 ( with High efficiency IE2, American Market, NEMA  EPACT )
0.37KW TO 300KW
2 POLE, 4 POLE, 6 POLE, 8 POLE
B3, B5, B14, B35, B34, V1
IE1
IE2
IE3
Heater
thermistor

Application

The explosion -proof motors are used in the following sectors, pls select the correct motor accoding to Zone, Category & degree of protection:


Overview

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 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) 2)

Dust 1) 2)

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

Assigned 
types of protection

Category 
according to 94/9/EC

Equipment protection level 
acc. to IEC/EN 60079-0

0

–

An area in which there is an explosive gas atmosphere constantly, over a long period or frequently.

Low-voltage motors 
not permitted

1

Ga

1

–

An area in which it is expected that an explosive gas atmosphere will occur occasionally during normal operation.

Ex e
Ex de
Ex d

2

Gb

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

3

Gc

–

20

An area in which there is an explosive atmosphere comprising a dust-air mixture constantly, over a long period or frequently.

Low-voltage motors 
not permitted

1

Da

–

21

An area in which it is expected that an explosive atmosphere comprising a dust-air mixture will occur occasionally during normal operation.

Ex tb

2

Db

–

22

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

Ex tc 3)

3

Dc

1) Motors of- Zone 1 can also be used in Zone 2- Zone 21 can also be used in Zone 22

2) 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.

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

Types of protection

Type of protection "Increased safety" Ex e acc. to IEC/EN 60079-7

Additional measures are taken to prevent the possibility of high temperatures and to prevent sparks or arcs from occurring on the inside and on external components of the motor.

Motors of the 1MA6 and 1MA7 series are designed with "Increased safety" – see Catalog D 81.1 · January 2012.

Type of protection "Explosion-proof enclosure" Ex d acc. to IEC/EN 60079-1

The components that can ignite an explosive atmosphere are located in an enclosure that is not damaged by an internal explosion and flameproof joints prevent flames from escaping to the explosive atmosphere on the outside.

The following motor series are designed with "Explosion-proofenclosure" Ex d:

  • 1MJ6/7 frame sizes 71 to 315 – see Catalog D 81.1 · January 2012
  • 1MD5 (IE2)

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.

Motors of the 1MB103 series are available in Ex nA design. For motors of the 1LA7/9, 1LA6 and 1LG series, see Catalog D 81.1 · January 2012.

Type of protection "Dust explosion protection" Ex t 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.

Motors of the 1MB101 and 1MB102 series are available in Ex t design. For motors of the 1LA7/9, 1LA6 and 1LG series, see Catalog D 81.1 · January 2012.

Explosion-proof motors for converter-fed operation

Principally, explosion-proof motors (except for Ex e) 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
  • 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 EU Directive 94/9/EC (ATEX) and are marked according to the following schematic:

Example "Non-sparking":

CE

0158

Ex

II

3

G

Ex

nA

IIC

T3

Gc

CE marking

✓

–

–

–

–

–

–

–

–

–

–

Number of the certifying "notified" body (0158 = EXAM)

–

✓

–

–

–

–

–

–

–

–

–

Explosion protection marking

–

–

✓

–

–

–

–

–

–

–

–

Device group:

I = Underground
II = All other areas

–

–

–

✓

–

–

–

–

–

–

–

Category:

2 (Zone 1/21)
3 (Zone 2/22)

–

–

–

–

✓

–

–

–

–

–

–

Explosive atmosphere

G = Gas
D = Dust

–

–

–

–

–

✓

–

–

–

–

–

Explosion protected equipment

–

–

–

–

–

–

✓

–

–

–

–

Type of protection nA, d, de, e, tb or tc 
(de = Ex d motor enclosure with Ex e connection box)

–

–

–

–

–

–

–

✓

–

–

–

Explosion group and explosion subgroup:

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

–

–

–

–

–

–

–

–

✓

–

–

Temperature class with max. surface temperature:

–

–

–

–

–

–

–

–

–

✓

–

T1 = 450 °C
T2 = 300 °C
T3 = 200 °C

T4 = 135 °C
T5 = 100 °C
T6 = 85 °C

Equipment protection level (G = Gas; D = Dust):

–

–

–

–

–

–

–

–

–

–

✓

Ga = Very high protection,
Gb = High protection,
Gc = Increased protection,

Da = Very high protection,
Db = High protection,
Dc = Increased protection

                      

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

Overview of SIMOTICS XP 1MA/1MB1/1MJ/1LA/1LG explosion-proof motors

The table below contains a complete overview of our products, their types of protection and the assignment of motor types 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 product.

Sector

Category

Zone

Frequency of occurrence of the Ex atmosphere

Type of protection

Temperature class

Equipment protection level

Degree of protection

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

Operation

Order code

Utilization according to temperature class

Standard

Gases and

vapors (G)

1G

0

Constantly or long-term

Not admissible with low-voltage motors

2G

1

Occasionally

Ex de IIC 1)
(explosion-proof enclosure)

T1 – T4

Gb

IP55

1MJ6
1MJ7

Mains

–

130 (B)

IEC/EN 60079-0
IEC/EN 60079-1

Converter

A15
A16

155 (F)

Ex e IIC 1)(increased safety)

T1 – T3

Gb

IP55

1MA6
1MA7

Mains

–

130 (B)/
155 (F) 3)

IEC/EN 60079-0
IEC/EN 60079-7

3G

2

Rarely or briefly

Ex nA  IIC 1)(non-sparking)

T1 – T3

Gc

IP55

1LA6, 1LA7,
1LA8, 1PQ8 2),
1LA9, 1LG4/6

Mains

M72

130 (B)

IEC/EN 60079-0
IEC/EN 60079-15

Converter

M73

1MB103

Mains

  

Dust (D)

1D

20

Constantly or long-term

Not admissible with low-voltage motors

2D

21

Occasionally

Ex tb IIIC 1):
conductive and non-conductive dust

Max. enclosure temperature
T 125 °C 6)

Db

IP65

1LA5, 1LA6,
1LA7, LA8 4),
1PQ8 2), 1LA9,
1LG4/6

Mains

M34

130 (B)

IEC/EN 60079-0
IEC/EN 60079-31

Converter

M38

3D

22

Rarely or briefly

Ex tc IIIB 1):
non-conductive dust

Dc

IP55

Mains

M35

Converter

M39

1MB101/2

Mains

  

Gases and vapors (G) and dust (D) 5)

2G
2D

1/21

Occasionally

Ex de IIC 1)
(explosion-proof
enclosure)/
Ex tb IIIC 1):
conductive and
non-conductive
dust

T1 – T4/
Max. enclosure temperature
T 135 °C

Gb
Db

IP65

1MJ6
1MJ/7

Mains

M76

130 (B)

IEC/EN 60079-0
IEC/EN 60079-1
IEC/EN 60079-31

Converter

M77

155 (F)

3G
3D

2 or 22

Rarely or briefly

Ex nA IIC 1)
(non-sparking)/
Ex tc IIIB:
non- conductive dust

T1 – T3/
Max. enclosure temperature
T 125 °C 6)

Gc
Dc

IP55

1LA6,
1LA7,
1LA9,
1LG4/6

Mains

M74

130 (B)

IEC/EN 60079-0
IEC/EN 60079-15
IEC/EN 60079-31

Converter

M75

1MB103 +B30

Mains

  

1) Highest explosion group IIC includes IIB and IIA. Optionally with Ex d connection box (order code K53).

2) 1PQ8 is not possible for Zone 21. Zone 2 and 22 for 1PQ8 available on request. Utilization according to temperature class 155 (F).

3) See EC type test certificate.

4) 1LA8 only available for Zone 22 (order codes M35, M39). Converter: utilization as standard according to temperature class 155 (F).

5) The Ex motor is not admissible in an explosive atmosphere of dust and air (hybrid). A standard is not currently available that describes the product requirements for a hybrid mixture.

6) 1MB1.1/2:
IE1: T140 °C
IE2: T120 °C (exceptions: 1MB1.11-1AD5; 1MB1.21-1AD5) T130 °C
IE3: T120 °C

Spectrum of 1LA/1MA/1MB Explosion-Proof Motors

Motor version

Motor type 
(alum.)

Motor type – Frame size– Rated output at 50 Hz (values in kW) or 60 Hz (values in hp)
   

71

80

90

100

112

132

160

180

200

225

Zone 1 Ex e II

1MA7

1MA7 0.12 … 16 kW

–

–

–

Zone 2 Ex n,
Zone 21/22 Ex t
IE1 Standard Efficiency

1MB1

–

–

–

1MB1 0.75 ... 18.5 kW

–

–

–

Zone 2 Ex n,
Zone 21/22 Ex t
IE2 High Efficiency

1MB1

–

–

–

1MB1 0.75 ... 18.5 kW

–

–

–

Zone 2 Ex n,
Zone 21/22 Ex t
IE3 Premium Efficiency

1MB1

–

–

–

1MB1 2.2 ... 18.5 kW

–

–

–

Zone 2 Ex nA II,
Zone 21/22 Ex tD
IE1 Standard Efficiency

1LA7

1LA7 0.09 … 18.5 kW

1LA5 1) 11 … 45 kW

Zone 2 Ex nA II,
Zone 21/22 Ex tD
IE2 High Efficiency

1LA9

1LA9 2) 0.12 … 37 kW

–

Zone 2 Ex nA II,
Zone 21/22 Ex tD
NEMA Energy Efficient

1LA9

1LA9 2) 0.12 … 37 kW
0.16 … 50 hp

–

1) Zone 2 Ex nA II is not possible for 1LA5 motors; for Zone 2 Ex nA II, 1LG4 motors are available.

2) Zone 2 Ex nA II is not possible for 1LA9 motors in frame sizes 180 and 200.

Spectrum of 1LA/1LG/1MA/1MJ Explosion-Proof Motors

Motor version

Motor type 
(cast-iron)

Motor type – Frame size– Rated output at 50 Hz (values in kW) or 60 Hz (values in hp)
   

71

80

90

100

112

132

160

180

200

225

250

280

315 S/M/L

315 L
1LG6 318-.M,
1LG6 312-.M

315

355

400

450

Zone 1 Ex e II

1MA6

–

–

–

1MA6 1.3 … 165 kW

–

–

–

–

–

Zone 1 Ex de IIC

1MJ6/1MJ7

1MJ6 0.25 … 15 kW

1MJ7 18.5 … 132 kW

–

–

–

–

–

Zone 2 Ex nA II,
Zone 21/22 Ex tD 
IE1 Standard Efficiency

1LA6/1LG4

–

–

–

1LA6 1) 0.75 … 18.5 kW

1LG4 11 … 200 kW

–

–

–

–

–

Zone 2 Ex nA II,
Zone 21/22 Ex tD
IE2 High Efficiency

1LG6

–

–

–

–

–

–

–

1LG6 2) 11 … 250 kW

–

–

–

–

–

Zone 2 Ex nA II,
Zone 21/22 Ex tD 
NEMA Energy Efficient

1LG6

–

–

–

–

–

–

–

1LG6 2) 15 … 250 kW
20 … 300 hp

–

–

–

–

–

1) Zone 21 Ex tD is not possible for 1LA6 motors.

2) Order identically priced predecessor type for 1LG6...2AA../ 1LG6...2AB.. 2-pole motors or 1LG6...4AA.. 4-pole motors using the options for country certificates, marine certificates, explosion-proof version and IE3 version. For 1LG6318-.M.. and 1LG6312-.M.. motors, it is not possible to use the options for country certificates, marine certificates, explosion-proof version, brakes, low-noise version and separately driven fan.

 

Benefits

The explosion-proof motors from Siemens offer the user numerous advantages:

  • The motors are designed in accordance with Directive 94/9/EC (ATEX 95 previously ATEX 100a). As product supplier, Siemens accepts responsibility for compliance with the applicable product standards for the selected equipment.
  • By using this product, the plant operating company satisfies Directive 1999/92/EC in accordance with Appendix II B (ATEX 137 previously ATEX 118a). The plant manufacturer or plant operating company is responsible for correct selection and proper usage of the equipment.
  • Comprehensive series of Ex motors for protection against gas and dust.
  • Individual versions of motors are possible thanks to the numerous catalog options.
  • Further special versions are possible on request.
  • Factory certificates 2.1 are available for a defined spectrum of Siemens motors/converters.
  • The Operating Instructions (Compact) are available in all the official EU languages as well as Russian and Chinese.
 

Application

The explosion-proof motors are used in the following sectors to prevent explosion hazards that result in serious injury to persons and severe damage to equipment:

  • Chemical and petrochemical industry
  • Production of mineral oil and gas
  • Gas works
  • Gas supply companies
  • Petrol stations
  • Coking plants
  • Mills (e.g. grain, solids)
  • Sewage treatment plants
  • Wood processing (e.g. sawdust, tree resin)
  • Other industries subject to explosion hazards
 

Technical specifications

General information

Ex motors in vertical type of construction with shaft extension pointing down must have a protective cover.

Extensive Operating Instructions (compact) are supplied as standard with explosion-proof motors in English and German. Translations are also available in all the other official EU languages as well as in Russian and Chinese.

For all explosion-proof motors, designs according to UL and CSA are not possible.

Motor connection

Certified metric cable glands/sealing plugs are included in the scope of supply of 1MB1 motors.

The certificates for the motors for hazardous areas are stored with the documentation in the selection tool DT Configurator.

Certified motor protection switches/tripping units must always be used for motor protection, see Catalog IC 10.

Zone 1 with Ex e II type of protection increased safety "e"

See Catalog D 81.1 · January 2012.

Zone 1 with Ex de IIC type of protection explosion-proof enclosure "d"

See Catalog D 81.1 · January 2012.

Type of protection Ex nA for use in Zone 2
  • Design for Zone 2 for mains-fed operation
  • For design for Zone 2 for converter-fed operation1), see Catalog D 81.1 · January 2012.

1MB1, 1LA or 1LG motors are modified for this purpose in the "Non-sparking" design and are suitable for use in hazardous areas of Zone 2 for temperature classes T1 to T3. The maximum surface temperature that can occur during operation must lie below the limit temperature of the respective temperature class. The ventilation system must be in accordance with IEC/EN 60079-0. The motors are equipped with an external grounding terminal. The connection box is similar to the Ex e design.

Please inquire in the case of:

  • Utilization according to temperature class 155 (F)
  • For pole-changing versions

For motors in the "Non-sparking" version, a conformity declaration is available from a recognized testing authority.

Ambient temperature -20 to +60 °C, whereby derating applies from 40 °C upwards. Other temperatures are available on request.

The rating plate or the extra rating plate contains the text:

Ex II 3G Ex nA IIC T3 Gc

Number of the "Conformity statement"

1) Not possible for 1MB1.

Type of protection Ex tb IIIC and Ex tc IIIB for use in Zones 21 and 22

The distinction between Zone 21 and 22 is as follows:

  • Ex tb IIIC acc. to IEC/EN 60079-311) for Zone 211)
    • Design for Zone 212), as well as Zone 22 for conductive dust (IP65) for mains-fed operation (1MB101)
  • Ex tc IIIB acc. to IEC/EN 60079-311) for Zone 22
    • Design for Zone 22 for non-conductive dust (IP55) for mains-fed operation (1MB102)
  • For design for Zone 21/22 for converter-fed operation, see Catalog D 81.1 · January 2012

The 1MB10 motors are modified for this purpose for use in zones subject to dust explosion hazards. The surface temperature is ≤ 120 °C3) at rated duty.

An external grounding terminal and a metal external fan are fitted to the motors.

Pole-changing versions are not possible for Zone 21 – they are possible for Zone 22 on request.

Certification:

  • Zone 21: EC type-examination certificate (ATEX) and EC Declaration of Conformity
  • Zone 22: conformity declaration and EC Declaration of Conformity

Identification on the rating plate (extra rating plate for SIMOTICS N-compact motors):

  • Zone 21: Ex II 2D Ex tb IIIC T125 °C Db
  • Zone 22: Ex II 3D Ex tc IIIB T125 °C Dc

Ambient temperature -20 to +60 °C, whereby derating applies from 40 °C upwards. Other temperatures are available on request.

1) Zone 21 only up to frame size 315 L.

2) Zone 21 includes conductive and non-conductive dust.

3) IE1: T140 °C
IE2: 1MB1.1-1AD5 and 1MB1.21-1AD5 T130 °C
IE3: T120 °C

Type of protection Ex nA/Ex tc for use in Zone 2/22

The motors must be ordered with:

  • Design for Zone 2 and 22 for non-conductive dust (IP55) for mains-fed operation – 
    Order code B30

Zone 2/22: Ex II 3D Ex nA IIC T3 Gc
Ex II 3D Ex tc IIIB IP55 T120 °C Dc1)

1) IE1: T140 °C
IE2: 1MB1.1-1AD5 and 1MB1.21-1AD5 T130 °C
IE3: T120 °C

Converter-fed operation

See Catalog D 81.1 · January 2012.

VIK version
  • VIK standard version – 1LE10 + order code C02
    "VIK" identification on rating plate.
  • VIK Ex n version – 1MB103 + order code C02
    "VIK" and "Ex nA IIC T3 Gc" identification on the rating plate according to Directive 94/9/EC (ATEX)
    "Ex nA II T3" identification will only be included on the rating plate on request as recommended by VIK.

Both versions include technology for Zone 2 to type of protection Ex nA IIC T3 Gc.

Motors up to frame size 355 can be supplied in accordance with the technical requirements of the VIK (Verband der Industriellen Energie- und Kraftwirtschaft e. V.).

Not possible for 1LE1002 (IE1) and 1MB1032 (IE1) motors, because the VIK "standard version" must be designed to efficiency class IE2 as a minimum and "Ex n" should have efficiency class IE2 as a minimum in accordance with the VIK recommendation published in March 2011.

Note:

8-pole motors or motors < 0.75 kW in the 1MB1/1LE1 series are still possible, because these motors are outside the output range specified for IE stamping.

Please inquire about converter-fed operation in all cases.

Motors in VIK design with mounted technology (brake, rotary pulse encoder and separately driven fan) are not compatible with Zone 2. Designs for Zone 21/22 are not possible.

For 1LA/1LG VIK motors, see Catalog D 81.1 January 2012 Edition.

Coolant temperature

Coolant temperature -40 to +40 °C for explosion-proof motor.

For all 1MB10 motors, frame sizes 100 to 160, in explosion protection types Ex nA or Ex t (Zone 21/22), the operating ambient temperature range can be optionally increased to -40 °C. Extensive technical measures are necessary in this case.

Order code D03

Order code D03 is not possible in combination with order code H02 "Vibration-proof version".

 
 

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