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SIMOTICS XP 1MA/1MJ/1LA/1LG Взрывозащищенные двигатели

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 are designed such that an explosion can be prevented when they are 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 Gas ^1) 2)	Dust ^1) 2)	Zone definition acc. to 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/EG
0	–	An area in which there is an explosive gas atmosphere constantly, over a long period or frequently.	Low-voltage motors not permitted	1
1	–	An area in which it is expected that an explosive gas atmosphere will occur occasionally during normal operation.	Ex e Ex d	2
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
–	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
–	21	An area in which it is expected that an explosive atmosphere comprising a dust-air mixture will occur occasionally during normal operation.	Ex tD A21	2
–	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 tD A22	3

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.

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".

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.

Motors of the 1MJ6 and 1MJ7 series are designed with "Explosion-proof enclosure".

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 1LA and 1LG series are optionally available in Ex nA design.

Type of protection "Dust explosion protection" Ex tD acc. to IEC/EN 61241

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 1LA and 1LG series are optionally available in Ex tD design.

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/EG (ATEX) and are marked according to the following schematic:

Example for explosion-proof enclosure:	CE	0158	Ex	II	2	G	Ex	De	IIC	T4	X
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, e or tD (de = Ex d motor enclosure with Ex e connection box)	–	–	–	–	–	–	–	✓	–	–	–
Explosion group	–	–	–	–	–	–	–	–	✓	–	–
Temperature class with max. surface temperature T1 = 450 °C T2 = 300 °C T3 = 200 °C T4 = 135 °C T5 = 100 °C T6 = 85 °C	–	–	–	–	–	–	–	–	–	✓	–
Special conditions according to the Operating Instructions or type test 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 XP 1MA/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	Degree of protection	Motor type (Pos. 1-4 of Order No.)	Operation	Order code	Utilization according to temperature class	Standard
Gases and vapors	1G	0	Constantly or long-term	Not admissible with low-voltage motors
	2G	1	Occasionally	Ex de IIC¹⁾ (explosion-proof enclosure)	T1 – T4	IP55	1MJ6 1MJ7	Mains	–	130 (B)	IEC/EN 60079-0 IEC/EN 60079-1
				Ex de IIC¹⁾ (explosion-proof enclosure)	T1 – T4	IP55	1MJ6 1MJ7	Converter	A15 A16	155 (F)	IEC/EN 60079-0 IEC/EN 60079-1
				Ex e II (increased safety)	T1 – T3	IP55	1MA6 1MA7	Mains	–	130 (B)/ 155 (F) ³⁾	IEC/EN 60079-0 IEC/EN 60079-7
	3G	2	Rarely or briefly	Ex nA II (non-sparking)	T1 – T3	IP55	1LA6 1LA7 1LA8, 1PQ8 ²⁾ 1LA9 1LG4/6	Mains	M72	130 (B)	IEC/EN 60079-15
	3G	2	Rarely or briefly	Ex nA II (non-sparking)	T1 – T3	IP55	1LA6 1LA7 1LA8, 1PQ8 ²⁾ 1LA9 1LG4/6	Converter	M73
Dust (D)	1D	20	Constantly or long-term	Not admissible with low-voltage motors
	2D	21	Occasionally	Ex tD A21: Conductive and non-conductive dust	Max. enclosure temperature T 125 °C	IP65	1LA5 1LA6 1LA7 1LA8 ⁴⁾, 1PQ8 ²⁾ 1LA9 1LG4/6	Mains	M34	130 (B)	IEC/EN 61241
	2D	21	Occasionally	Ex tD A21: Conductive and non-conductive dust	Max. enclosure temperature T 125 °C	IP65		Converter	M38
	3D	22	Rarely or briefly	Ex tD A22: Non-conductive dust		IP55		Mains	M35
	3D	22	Rarely or briefly	Ex tD A22: Non-conductive dust		IP55		Converter	M39
Gases and vapors (G) and dust (D) ⁵⁾	2G/D	1/21	Occasionally	Ex de IIC¹⁾ enclosure)/ Ex tD A21: Conductive and non-conductive dust	T1 – T4/ Max. enclosure temperature T 135 °C	IP65	1MJ6/7	Mains	M76	130 (B)	IEC/EN 60079-0 IEC/EN 60079-1 IEC/EN 61241
	2G/D	1/21	Occasionally		T1 – T4/ Max. enclosure temperature T 135 °C	IP65	1MJ6/7	Converter	M77	155 (F)	IEC/EN 60079-0 IEC/EN 60079-1 IEC/EN 61241
	3G/D	2/22	Rarely or briefly	Ex nA II (non-sparking)/ Ex tD A22: Non- conductive dust	T1 – T3/ Max. enclosure temperature T 125 °C	IP55	1LA6 1LA7 1LA9 1LG4/6	Mains	M74	130 (B)	IEC/EN 60079-15
	3G/D	2/22	Rarely or briefly	Ex nA II (non-sparking)/ Ex tD A22: Non- conductive dust	T1 – T3/ Max. enclosure temperature T 125 °C	IP55	1LA6 1LA7 1LA9 1LG4/6	Converter	M75	130 (B)	IEC/EN 60079-15

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 explosion-proof motor is not admissible in an explosive atmosphere of gas and dust (hybrid). A standard is not currently available that describes the product requirements for a hybrid mixture.

Spectrum of 1LA/1MA 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)
Motor version	Motor type (cast-iron)	71	80	90	100	112	132	160	180	200	225
Zone 1 Ex e II	1MA7	1MA7 0.12 … 16 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)
Motor version	Motor type (cast-iron)	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.