Technical information Siemens

Область применения



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

Обзор



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



Особенности



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

  • The motors are designed to IEC/EN 60079-0 and IEC/EN 60079-15 or IEC/EN 60079-31 and EC Directive 94/9/EC (ATEX). 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. The plant operating company is responsible for correct selection and proper use 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 order codes.
  • Further special versions are possible on request.
  • The Operating Instructions (Compact) are available in all the official EU languages as well as Russian and Chinese.

Технические данные



General information

Ex motors in vertical type of construction with shaft extension pointing down must have a protective cover (position 14 of Article No.: G).

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 (order code D31) and CSA (order code D40) are not possible.

Motor connection

For 1MM1, 1MH1, 1MQ1 and 1MN1 motors in the explosion-proof design, the cable entry plate is supplied undrilled as standard.

This enables you to adapt the number and size of the boreholes to the rated conditions. The cable entry can be rotated by 180°.

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.

When metal armored cables are routed into the auxiliary terminal boxes, the metal shield must only be grounded once: either in the auxiliary terminal box or in the control room of the operator.

In the case of SIMOTICS FD motors 1MM1, 1MH1, 1MQ1 and 1MN1, monitoring of the bearing temperature is only mandatory for Zone 22 (order code A72).

Type of protection Ex nA for use in Zone 2

  • Design for Zone 2 for mains-fed operation (order code M72)
  • Design for Zone 2 for converter-fed operation (order code M73)

1MM1, 1MH1, 1MQ1 and 1MN1 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 is below the limit temperature of the respective temperature class. The ventilation system complies with IEC/EN 60079-0/-15/-31. The motors are equipped with an external grounding terminal. The terminal box is designed for Ex e type of protection.

Ambient temperature -0 °C 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

Type of protection Ex tc for use in Zone 22

Ex tc in accordance with IEC/EN 60079-31 for Zone 22 with non-conductive dust (IP55)

  • Design for Zone 22 for mains-fed operation (order code M35)
  • Design for Zone 22 for converter-fed operation (order code M39)

1MM1, 1MH1, 1MQ1 and 1MN1 motors are modified for thispurpose for use in zones subject to dust and explosion hazards.The surface temperature is ≤ 125 °C at rated duty.An external grounding terminal and a metal external fan arefitted to the motors.

Certification:

  • Zone 22: EC Declaration of Conformity, IEC Ex Certificate of Conformity

Identification on the rating plate (extra rating plate for SIMOTICS FD motors):

  • Zone 22: Ex II 3D Ex tc IIIB T125 °C

Ambient temperature -0 °C to +60 °C, whereby derating applies from 40 °C upwards. Other temperatures are available on request.

This version can be ordered with the note "Operation in Zone 2 or Zone 22".

Converter-fed (1MM1, 1MH1, 1MQ1, 1MN1) or mains-fed operation (1LH1)

With converter-fed operation, the torque reduction factors for drives for fans, pumps and compressors must be configured according to the table in the section "Derating". The torque reduction factors for constant torque drives will be configured, on request, on specification of the speed control range and the required torque.

For converter-fed operation, Ex motors must always be monitored using PTC thermistors. Certified tripping units are required for this purpose, see Catalog IC 10.

Explosion-proof motors 1MM1, 1MH1, 1MQ1 and 1MN1

The motors of the 1MM1, 1MH1, 1MQ1 and 1MN1 series are available in Ex nA (Zone 2) or Ex tc (Zone 22) types of protection. The motors have PTC thermistors for alarm and tripping in accordance with thermal class 155(F). Ambient temperatures in the range from -20 to +60 °C are possible, whereby additional derating applies from +40 °C upwards. Please inquire in such cases.

For 1MM1 motors, order code K35 (metal external fan) must be specified in the order. The 1MM1...-3BB..-1… motors are an exceptional case, however, because they are equipped with a unidirectional external fan. When ordering these motors, order code K37 must be specified for clockwise rotation or order code K38 for anticlockwise rotation.
An EC Declaration of Conformity is enclosed with every motor. In the case of motors for converter-fed operation, the following information must be supplied in the order or inquiry in plain text:

  • For a constant torque drive (order code B61: T = const.) ordrives for fans, pumps and compressors (order code B60: M ~ n2)
  • Maximum load torque
  • Speed control range
  • Utilized thermal class that the motor should or must comply with

Note:
Motors of the 1L.1 series (non-Ex motors) are utilized in accordance with thermal class 180 (H)/155 (F) (or 155 (H)/130 (B) – order code C10). Derating of motors of the 1M.1 series (Ex motors) results in a corresponding reduction in thermal utilization. These specifications regarding operation are labelled on an extra rating plate on the motor. The rating data on the rating plateis specified for the load torque at maximum speed.

Type of protection Ex nA for use in Zone 2

The motors are modified for operation in Zone 2 and designed for compliance with temperature class T3 (maximum surface temperature of 200 °C inside the motor).

  • Design for Zone 2 for mains-fed operation – order code M72:
    Standard utilization in accordance with thermal class 130 (B). Utilization in accordance with thermal class 155 (F) with service factor (order code C14) possible on request.
  • Design for Zone 2 for converter-fed operation – order code M73:
    Standard utilization in accordance with thermal class 155 (F) in drives for fans, pumps and compressors (order code B60: M ~ n2) *). For utilization in accordance with thermal class 130 (B) the output must be reduced by 14 % from the rated output of a comparable 1L.1 (non-Ex) motor. In constant torque drives (order code B61: T = const) the thermal utilization depends on the value of the load torque and the speed control range (→ 130 (B) and/or 155 (F)). The maximum possible constant torque is dependent on the speed control range and the cooling method of the motor → thermal torque limit characteristic.
    IEC/EN 60079-15 specifies that the motor and converter must be tested as a unit. As an alternative, however, it is also admissible for the thermal response to be determined by a calculation. The thermal response of the motors for operation on Siemens converters is known, so a system test is not generally required for drives for fans, pumps and compressors. Please inquire as to whether a system test is necessary or not in thecase of a constant torque drive → constant torque drives on request only.

The following identification is included on an extra rating plate on the motor:

II 3G Ex nA IIC T3 Gc, IEC/EN 60079

Type of protection Ex tc for use in Zone 22 for non-conductive dust

The motors are modified for operation in Zone 22 and designed such that an external motor surface temperature of 125 °C is not exceeded. For the 1MM1, 1MH1, 1MQ1 and 1MN1 motor series, monitoring of the bearing temperature is required for operation in Zone 22. These motors are therefore equipped with bearing temperature sensors as standard.

  • Design for Zone 22 for mains-fed operation –
    order code M35:
    Standard utilization in accordance with thermal class 130 (B).Utilization in accordance with thermal class 155 (F) with service factor (order code C14) possible on request.
  • Design for Zone 22 for converter-fed operation –
    order code M39:
    Standard utilization approximately in accordance with thermal class 155 (F) in drives for fans, pumps and compressors (order code B60: M ~ n2) *). For utilization in accordance with thermal class 130 (B) the output must be reduced by 14 % from the rated output of a comparable 1L.1 (non-Ex) motor. In constant torque drives (order code B61: T = const) the thermal utilization depends on the value of the load torque andthe speed control range (→ 130 (B) and/or 155 (F)). The maximum possible constant torque is dependent on the speed control range and the cooling method of the motor → thermal torque limit characteristic. When configuring these motors, therefore, it is important to note that the maximum admissible torque, as a function of speed, is not exceeded. Please inquire as to whether a system test is necessary or not in the case of a constant torque drive → constant torque drives on request only.

The following identification is included on an extra rating plate on the motor:

II 3D Ex tc IIIB T125°C Dc, IEC/EN 60079

Operation on non-Siemens converter

It is normally necessary to inquire regarding operation of the motors on a non-Siemens converter, regardless of the type of protection and torque characteristic of the driven machine. A test must be performed to ensure that the temperature limits are complied with. This should take place at the customer''s premises (not possible in the factory).

Derating

In comparison to non-Ex motors, the rated output of Ex motors is reduced. Derating is performed in accordance with defined factors. The reference output here is the rated output of the non-Ex motor.

Derating factors for motors of the 1M.1 series

Motor type

Zone (order code)

Zone 2 (M72)

Zone 2 (M73)

 

Zone 22 (M35)

Zone 22 (M39)

 

Torque (order code) *)

M ~ n2 (B60)

M ~ n2 (B60)

T = const (B61)

M ~ n2 (B60)

M ~ n2 (B60)

T= const (B61)

1MM1

–

0.9

a. A.

–

0.8

O. R.

1MQ1

–

0.9

a. A.

–

0.8

O. R.

1MH1

–

0.9

a. A.

1

0.9

O. R.

1MN1

–

0.9

a. A.

–

1

O. R.



Rating plate labeling for Ex motors of the SIMOTICS FD series

Rating plate

In contrast to the non-Ex motor, the rating plate specifies that the voltage tolerance is compliant with IEC/EN 60034-1, Zone A.

Valid for:
Order code M72: Zone 2 for mains-fed motors
Order code M73: Zone 2 for converter-fed motors
Order code M35: Zone 22 for mains-fed motors
Order code M39: Zone 22 for converter-fed motors

If, in addition to order code M72 or M73, order code D36 (conformity statement) and/or D37 (IEC Ex certificate) is also specified in the order, the corresponding certificate numbers will be stamped on the rating plate (only applicable to order codes M72 and M73).

Extra rating plate

On the extra rating plate, the torque characteristic, speed or frequency control range and the torque are specified as a minimum.

Valid for:
Order code M73: Zone 2 for converter-fed motors
Order code M39: Zone 22 for converter-fed motors
Order code M60: M ~ n2

Ex plate

Zone 2:

Note:
The letter(s) between "Ex nA" and "II T3 Gc" vary according to the additional components of the motor (e.g. temperature sensor, anti-condensation heating, etc.).

Valid for:
Order code M72: Zone 2 for mains-fed motors
Order code M73: Zone 2 for converter-fed motors

Valid for:
Order code M35: Zone 22 for mains-fed motors
Order code M39: Zone 22 for converter-fed motors

VIK version

  • VIK standard version – Order code K30
    "VIK" identification on rating plate.
  • VIK Ex n version – Order codes K30 + C27
    Kennzeichnung „VIK" und „Ex nA IIC T3“ auf dem Leistungsschild nach Richtlinie 94/9/EG (ATEX)
    "VIK" and "Ex nA IIC T3" identification on the rating plate according to Directive 94/9/EC (ATEX)" Ex nA IIC T3" identification will only be included on the rating plate on request as recommended by VIK.
    Note:
    Order coder C27 can only be ordered in combination with order code K30.

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

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.", the Association of the Industrial Energy and Power Industry).

Coolant temperature

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

For all 1MM1, 1MH1, 1MQ1 and 1MN1 motors in explosion protection types Ex nA or Ex tc (Zone 2/22), the operating ambient temperature range can be optionally increased to – 40 °C. Extensive technical measures are necessary in this case (e.g.: metal external fan).
Order code D19

Special technology

"Special technology" comprises mounted technology that is compatible with explosion-proof motors.

Explosion-proof motors can be implemented in a broader range of applications when explosion-proof rotary pulse encoders or explosion-proof separately driven fans are mounted.

The use of a separately driven fan is recommended to increase motor utilization at low speeds and to limit noise generation at speeds significantly higher than the synchronous speed.

For motors of the 1MQ1 series with forced ventilation, only radially mounted separately driven fans are available (position 16 of Article No. = 2, 3, 4).

Explosion-proof rotary pulse encoder

The rotary pulse encoder can only be mounted on a standard non-drive end (NDE), i.e. a second shaft extension or protective cover cannot be supplied. In the case of a vertical mounting position for motors of the 1MM1 series, therefore, a suitable cover must be implemented by the customer to prevent small parts from falling into the fan cover (see also standard IEC/EN 60079-0).

The type of protection of the rotary pulse encoder must be observed. The relevant data are stamped on the rating plate of the rotary pulse encoder.

When an explosion-proof rotary pulse encoder is mounted, the length of the motor increases by dimension l. For an explanation of the additional dimensions and weights, see "Dimensions and weights of explosion-proof rotary pulse encoders" on the website of the encoder manufacturer.

HOG 10 and HOG 11 rotary pulse encoders

The HOG 10 and HOG 11 rotary pulse encoders have an extremely rugged design and are therefore ideally suited to difficult operating conditions.

The following order codes are available for explosion-proof rotary pulse encoders (ATEX):

  • H73: HOG 10 D 1024 I
  • H83: HOG 10 DN 2048
  • H88: HOG 11 DN 1024 I (16 mm) special corrosion protection

Encoder mounting for use below –20 °C and above +40 °C is available on request.

Please consult the manufacturer''s website for further information and technical specifications of the encoders.

Manufacturers of rotary pulse encoders

Types: HOG 10, HOG11:
Baumer Hübner GmbH
Max‑Dohrn‑Str. 2+4
10589 Berlin
Germany
Tel. +49 (0)30‑6 90 03‑0
Fax +49 (0)30‑6 90 03‑1 04

http://www.baumerhuebner.com
E‑Mail: info@baumerhuebner.com