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Gas Explosion-proof Motor

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Company Profile
1MT0003 Flameproof Three-Phase Asynchronous Motor

Siemens Standard Motors Ltd. (SSML)

Siemens Standard Motors Ltd. (SSML) is a Siemens-owned company in China. SSML is located in Yizheng City, Jiangsu Province. The company focuses on developing and producing small and medium low-voltage motors. Currently, SSML mainly produce Siemens brand low voltage AC motors according to IEC standards, and Beide brand low voltage motors designed according to China local standards.

As one of Siemens main low-voltage motor production facilities worldwide, SSML uses the knowledge and experience of more than 100 years in motor design and manufacturing, owns the advanced manufacture equipment and process, adopts the SIEMENS modern management model , and implements comprehensive quality control according to ISO9001 2015. SSML will continuously serve customers with high quality products and good service.


1MT0003 Flameproof Three-Phase Asynchronous Motor


In many industrial and public industries, explosion hazards are ever- present, e.g. the chemicals industry, refineries, on drilling platforms, gas stations, feed manufacturing and 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.
To ensure 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.

Classification of zones
Areas subject to explosion hazard are divided into zones. Zoning is based on the presence time of explosive substances and probability of explosion. Information and specifications for classification of the zones are laid down in the following standards:
•GB 3836.14, IEC/EN 60079-10-1 for gas atmospheres
•GB 12476.3, IEC/EN 60079-10-2 for dust atmospheres
Furthermore, a distinction is made between various explosion groups as well as temperature classes and these are included in the hazard assessment.
1MT0003 Flameproof Three-Phase Asynchronous Motor

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 a surrounding explosive atmosphere from being ignited.

Zone

 


Assigned types of protection

Category according to 2014/34/EU

Equipment protection level acc. to GB3836.1 & IEC/EN 60079-0

 

 

Gas

1) 2)

Dust

1) 2)

Zone definition acc. to

GB3836.14 & IEC/EN 60079-10-1 for gas atmospheres GB 12476.3 & IEC/EN 60079-10-2 for dust atmospheres

 

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(GB) or Ex eb(IEC), Ex de, Ex d(GB) or Ex db(IEC)

 

2

 

Gb

 

2

 

–

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

 

Ex nA(GB) or Ex ec(IEC)

 

3

 

Gc

 

–

 

20

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

 

 

Ex tb

 

 

2

 

 

Db

 

 

 

–

 

 

 

22

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

 

 

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) Ex tc motors are not approved for operation in environments containing conductive du

Application
The explosion-proof motors are often used in the following industries to prevent explosion hazards that result in serious injury to persons and severe damage to property.
•Chemical and petrochemical industry
•Production of mineral oil and gas
•Gas works
•Gas supply companies
•Petrol stations
•Coking plants
•Mills (e.g. corn, solids)
•Sewage treatment plants
•Wood processing (e.g. sawdust, tree resin)
•Other industries subject to explosion hazardsst.


Flameproof class of gases and vapors

Location

Code of standard

GB3836.1 / GB3836.2 / IEC60079-0 / IEC60079-1

Flameproof class

For Mines

d Ⅰ

 

Explosive gas environment except mines

d Ⅱ A

d Ⅱ B

d Ⅱ C


Temperature classes

Temperature class of electrical equipment

lMaximum surface temperature of electrical equipment

Ignition temperature of gases or vapors

T1

450ºC

> 450ºC

T2

300ºC

> 300ºC

T3

200ºC

> 200ºC

T4

135ºC

> 135ºC

T5

100ºC

> 100ºC

T6

85ºC

> 85ºC

Classification of gases and vapors into explosion groups and temperature classes

explosion group

Temperature classes

T1（450）

T2（300）

T3（200）

T4（135）

T5（100）

T6（85）

Material designation

Material designation

Material designation

Material designation

Material designation

Material designation

IIA (MESG≥0.9mm)

Acetone

i-amyl acetate

Benzine

Acetaldehyde

 

 

Ethane

n-butane

Gasoline

Ethyl acetate

n-butyl alcohol

Special benzine

Ethyl chloride

Cyclohexanone

Diesel fuel

Ammonia

1.2- dichloroethane

Heating oils

Benzene


Acetic acid anhydride

n-hexane

Acetic acid

Carbon monoxide

Methane

Methanol

Methyl chloride

Naphthalene

Phenol

Propane

Toluene

IIB (0.5mm<MESG

<0.9mm)

Town gas (illuminating gas)

Ethyl alcohol

Hydrogen sulfide

Ethyl ether

 

 

Ethylene

Ethylene oxide

IIC (MESG≤0.5mm)

Hydrogen

Acetylene

 

 

 

Carbon disulfide

MESG, maximum experimental safe gap (for an explosive mixture). It's maximum gap of a joint of 25 mm in width which prevents any transmission of an explosion during 10 tests made under the conditions specified in GB 3836.11 and IEC 60079-20-1.
The smaller the MESG value, the higher the explosion-proof level of the equipment, and the more stringent requirements for the equipment. If the equipment can run under the IIC gas group, it also meets the requirements of IIA and IIB.


Noise levels for mains-fed operation
The noise levels are measured in accordance with DIN EN ISO 1680 in a anechoic room. It is specified as the A-valued measuring-surface sound pressure level Lpfa in dB (A). This is the spatial mean value of the sound pressure levels measured on the measuring surface. The measuring surface is a cube 1 m away from the motor surface. The sound power level is also specified as LWA in dB (A). Please find the noise value in technical data table, the specified values are only valid for totally enclosed fan cooling (cooling method: IC411) motor with no load at 50 Hz with no load, and the tolerance is +3 dB. While motor operating 60 Hz with no load, the values are approximately +4 dB (A) higher.
Vibration
1MT0003 rotors are dynamically balanced to severity grade A using a half key. Table below contains the effective vibration values for unloaded motors. Vibration grade B can be provided as option.

Vibration Grade

Frame size (mm)

56 ≤ FS ≤ 132

H>132


Mounting


Vibration displacement/um


Vibration velocity/(mm/s)


Vibration displacement/um


Vibration velocity/(mm/s)

 

A

Free suspension

45

2.8

45

2.8


Rigid mounting

-

-

37

2.3

2.81)

 

B

Free suspension

18

1.1

29

1.8

Rigid mounting

-

-

24

1.5

1.81)

Note:
1） The level are vibration velocity limit when the twice line frequency vibration level is dominant defined by GB/T 10068-2020, for 2p motors that frame size bigger than 132mm.


Bearing Assignment
1MT0003 series motor are supplied with ball bearing as standard, these bearings are either sealed or regreasable type. Bearing design meets
the requirements of explosion protection. Fixed bearing at NDE is as standard configuration for FS160 ~3 55 motors；For FS80 ~ 132 motors the bearings are floating, fixed bearing at DE can be ordered with option code L20.
If higher cantilever force on the shaft required, the increased cantilever bearing design (Option code: L22) should be considered.
As standard, FS80 ~ 250 motors are not with regreasing device, but re-greasing device (Option code: L23) can be configured in FS160~250. FS280 ~ 355 motors with regreasable bearing and regreasing device is configured as standard.
The following table lists the standard bearing configuration.


Bearing Assignment

 

Frame size

 

 

Number of poles


Standard design


Optional design


Horizontal / Vertical mounting


Increased cantilever force (option code L22)


DE bearing


NDE bearing


DE bearing


NDE bearing

80

2 ~ 6

6204-2RZ C3

6204-2RZ C3

-

-

90

2 ~ 6

6205-2RZ C3

6205-2RZ C3

-

-

100

2 ~ 6

6306-2RZ C3

6306-2RZ C3

-

-

112

2 ~ 6

6306-2RZ C3

6306-2RZ C3

-

-

132

2 ~ 8

6308-2RZ C3

6308-2RZ C3

-

-

160

2 ~ 8

6309-2RZ C3

6309-2RZ C3

NU309

6309 C3

180

2 ~ 8

6310-2RZ C3

6310-2RZ C3

NU310

6310 C3

200

2 ~ 8

6312 C3

6312 C3

NU312

6312 C3

225

2 ~ 8

6313 C3

6313 C3

NU313

6313 C3

250

2 ~ 8

6315 C3

6315 C3

NU315

6315 C3

 

280

2

6315 C3

6315 C3

NU315

6315 C3

4 ~ 8

6317 C3

6317 C3

NU317

6317 C3

 

315

2

6316 C3

6316 C3

NU316

6316 C3

4 ~ 8

6319 C3

6319 C3

NU319

6319 C3

 

355

2

6317 C3

6317 C3

NU317

6317 C3

4~ 8

6320 C3

6320 C3

NU320

6320 C3


Grease life and re-greasing interval
For permanent lubrication, the bearing grease lifetime is matched to the bearing lifetime.

Grease lifetime and re-grease interval (Horizontal installation)

Using permanent lubrication bearing

Frame size

Poles

Grease lifetime up to CT 40oC 1)

80 ~ 250

2-8

20000 （or）40000 2）

1) Maximum ambient temperature is 40oC under standard conditions. For permanent lubrication bearings, grease lifetime will be halved for each 10K ambient temperature rising.
2) The 40000h grease lifetime is suited for horizontal mounting motors without additional axial force.

 Using re-greasable bearing


Frame size


Poles


Bearing


Interval under standard ambient temperature(h)

 

160

2P

6309 C3 NU309

4000

4~8P

8000

 

180

2P

6310 C3 NU310

4000

4~8P

8000

 

200

2P

6312 C3 NU312

4000

4~8P

8000

 

225

2P

6313 C3 NU313

4000

4~8P

8000

 

250

2P

6315 C3 NU315

4000

4~8P

8000

 

 

280

2P

6315 C3 NU315

4000

4P

6317 C3 NU317

6000

6~8P

8000

 

 

315

2P

6316 C3 NU316

3000

4P

6319 C3 NU319

4000

6~8P

6000

 

 

355

2P

6317 C3 NU317

3000

4P

6320 C4 NU320

4000

6~8P

6000

When the motor runs outside of normal conditions, the bearing life will be reduced, such as the following conditions.
■When motor runs beyond the rated speed, the increase of motor vibration will result in the extra radial and axial force on bearing. This will reduce the life of bearing;
■When the motor vibration increase due to the environment or other equipment, the bearing also will endure more radial and axial force. This also will reduce the life of bearing;

Connection box
The connection box is located on the top of motor housing as standard, and can be rotated by 4×90º to allow for cable entry from each direction. When selecting the entrance to the motor drive end, please notice whether there is enough space in front of the installation for the cable line. For the standard connection box with hoop gland, the motor of FS 80~225 has one hoop gland, and the motor of FS250~355 has two.



Motor protection

Anti-condensation heater
Motors whose windings are at risk of condensation due to the climatic conditions, e.g. inactive motors in humid atmospheres or motors that are subjected to widely fluctuating temperatures can be equipped with anti-condensation heaters (Option code: Q04).
Anti-condensation heaters must be switched off during operation. When motor shut down, the heaters must be switched on.
The electrical parameters of anti-condensation heaters are shown in the following table.

Electrical data of Anti-condensation heater


Frame size

Power (W) & voltage (V)

Q04

80 ~ 90

20 W / 220 V

100 ~ 112

30 W / 220 V

132 ~ 160

40 W / 220 V

180 ~ 200

50 W / 220 V

225 ~ 280

60 W / 220 V

315

80 W / 220 V

355

100 W / 220 V

Motor thermal overload protection
Motor thermal protection means to use of thermal protectors and thermal detectors incorporated into the stator windings or placed in other suitable positions in motor in order to protect them against serious damage due to thermal overloads.
The order variants for motor protection are coded with letters in the 15th position of the Motor Order No., or ordered with Option code.

Rated Output
1MT0003 motors rated output powers means that the motor runs under continuous duty S1 (IEC 60034 - 1) operation when operated at ambient temperature from -20 ºC to 40 ºC and at altitudes of up to 1000 m over sea.
Voltage and Frequency
IEC 60034-1 differentiates between Category A (combination of voltage deviation ±5 % and frequency deviation ±2 %) and
Category B (combination of voltage deviation ±10 % and frequency
deviation +3 % / -5 %) for voltage and frequency fluctuations. The motors can supply their rated torque in both Category A and B. In Category A, the temperature rise is approximately 10 K higher than during normal operation.

Standard 60034 - 1

 Category A

Category B

Voltage deviation

±5 %

±10 %

Frequency deviation

±2 %

+3 % / -5 %

According to the standard, longer operation is not recommended for Category B.

Tolerance for electrical data
■Efficiencyηat
  Prated Prated
  ≤ 150 kW: - 0.15 x (1 – η)
  > 150 kW: - 0.10 x (1 – η)
  Prated  ≤ 150 kW: - 0.15 x (1 – η)
  Prated > 150 kW: - 0.10 x (1 – η) With η being a decimal number
■Power factor - (1 – cosφ) / 6 Minimum absolute value: 0.02 Maximum absolute value: 0.07
■Slip ±20 % (for motors < 1 kW ±30 % is admissible)
■Locked-rotor current +20 %
■Locked-rotor torque -15 % to +25 %
■Breakdown torque -10 %
■Moment of inertia ±10 %
Overload times
According to IEC60034, 1MT0003 series motors are designed to withstand overload capacity of 1.5 times rated current for 2 minutes at rated voltage and frequency.


Certificates

Flameproof series motor 1MT0003Flameproof series motor 1MT0003Flameproof series motor 1MT0003Flameproof series motor 1MT0003

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