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Operating Instructions -MTR4.2-003

Three-phase induction motorType 1LA8

Supply Voltage is hazardous and cancause Electric Shock and burns.

Disconnect Power before proceedingwith any work on this equipment.

WARNING!

Table of content

1 Safety information ................................................................................................................................. 11.1 Definitions, warning information ........................................................................................................... 11.2 Safety and application information ........................................................................................................ 2

1.3 Operation in locations subject to explosion hazards ................................................................................ 2

1.4 Electromagnetic compatibility ................................................................................................................ 2

2 Description, technical data .................................................................................................................... 32.1 Scope of delivery ................................................................................................................................... 3

2.2 Siemens Service Center ......................................................................................................................... 3

2.3 Applications .......................................................................................................................................... 3

2.4 Design of the motor .............................................................................................................................. 3

2.5 Main Terminal Boxes ............................................................................................................................. 4

3 Transport, installation and assembly .................................................................................................... 73.1 Transport, storage ................................................................................................................................. 7

3.2 Installation ............................................................................................................................................ 8

3.3 Aligning ................................................................................................................................................ 9

3.4 Mounting ............................................................................................................................................ 103.5 Connecting the ground conductor ....................................................................................................... 10

3.6 Connection of the motor ..................................................................................................................... 11

3.7 Connection to the converter ................................................................................................................ 13

3.8 Converter operation on a grounded network ........................................................................................ 13

4 Commissioning .................................................................................................................................... 144.1 Preparations........................................................................................................................................ 14

4.2 Measures to be taken prior to commissioning ....................................................................................... 15

4.3 Monitoring the temperature of the stator winding................................................................................ 15

4.4 Energizing........................................................................................................................................... 15

4.5 De-energizing ..................................................................................................................................... 16

5 Operation ............................................................................................................................................. 175.1 Safety information .............................................................................................................................. 17

5.2 Stoppages ........................................................................................................................................... 175.3 Fault diagnosis table............................................................................................................................ 17

6 Maintenance ........................................................................................................................................ 206.1 Maintenance ....................................................................................................................................... 20

6.1.1 Preparations for maintenance .............................................................................................................. 20

6.1.2 Bearings ............................................................................................................................................. 20

6.1.3 Regreasing with sealing grease (option for increased degree of protection) ........................................... 21

6.2 Servicing ............................................................................................................................................. 21

6.2.1 Servicing instructions .......................................................................................................................... 21

6.2.2 First service after installation or repair ................................................................................................. 21

6.2.3 Main service ....................................................................................................................................... 22

6.3 Repair ................................................................................................................................................. 22

6.3.1 Preparations for overhauling / repairs ................................................................................................... 22

6.3.2 Dismantling ........................................................................................................................................ 226.3.3 Dismantling instructions ...................................................................................................................... 22

6.3.4 Re-assembly ........................................................................................................................................ 23

6.3.5 Notes on assembling the bearing seal .................................................................................................. 24

6.3.6 Assembling the fan ............................................................................................................................. 24

6.3.7 Bolt locking devices and tightening torques ......................................................................................... 24

6.3.8 Spare Parts .......................................................................................................................................... 24

6.3.9 Exploded View – 1LA8 Motor ............................................................................................................... 25

1 Safety information

1.1 Definitions, warning information

Warning

The data and recommendations specified in allthe instructions supplied, and in all other relatedinstructions, must always be observed in orderto avoid hazardous situations and the risk ofpossible injury or damage.

Furthermore, the pertinent national, local andplant-specific regulations and requirementsshould be kept in mind!

Special designs and other versions may vary intechnical details! If in doubt, be sure to contactthe manufacturer, quoting the type designationand serial number, or have maintenance workdone by one of Siemens Service Centers.

Qualified persons

Only qualified persons who have carefully read andunderstood the content of this documentation shouldbe entrusted with the commissioning and operation ofmachines, equipment or systems. Qualified persons asfar as the safety instructions given in thisdocumentation are concerned are those who have thenecessary authorization to commission, earth andidentify equipment, systems and circuits in accordancewith the relevant safety standards.

Safety guidelines

This documentation contains instructions, which mustbe followed closely in order to ensure personal safetyand avoid damage to the equipment and machines.

Personal safety instructions are highlighted in themanual by a warning triangle, while damageavoidance instructions are not. They are marked asfollows depending on the level of danger:

Danger

Danger means that death or grievous injury willoccur if the appropriate precautions are nottaken.

Warning

Warning means that death or grievous injurymay occur if the appropriate precautions are nottaken.

Caution

Caution with a warning triangle means thatminor personal injury may occur if theappropriate precautions are not taken.

CautionCaution without a warning triangle means thatdamage to property may occur if theappropriate precautions are not taken.

Notice

Notice means that an undesirable result or state mightoccur if the relevant instructions are not followed.

Note

Note draws particular attention to an important itemof information about the product, its use or thecorresponding section of the documentation, whichcould be useful to the user or operator.

Proper usage

Please pay close attention to the following:

Warning

The electrical equipment contains componentsthat are at a dangerous voltage. Before any workis carried out, therefore, it must be ensured thatthe equipment is isolated from the supply.

Only qualified persons may work with thisequipment.

These persons must be familiar with allinstructions and precautions to be taken /specified in this documentation that are relevantfor safety.

Safe and satisfactory operation of this motorpresumes satisfactory transport, proper storage,installation and assembly and carefulsubsequent operation and maintenance.

This motor may only be used for the applicationsspecified in the catalog and the technicaldescription, and only in conjunction with third-party devices and components recommendedand/or approved by Siemens.

Failing to adhere to these instructions mayresult in severe injury and/or damage toproperty.

National safety regulations must be closelyobserved.

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1.2 Safety and application information

The safe use of electrical machines

Danger

These electrical machines are designed for usein industrial power systems.

Rotating or live and uninsulated parts pose adanger.

There is consequently a risk of fatal or severepersonal injury or substantial damage toproperty if the necessary covers are removedwithout authorization or if the equipment ishandled improperly, operated incorrectly ormaintained inadequately.

If the motors are used outside industrial areas,the installation site must be safeguarded againstunauthorized access by means of suitableprotection facilities (e.g. fencing) andappropriate warning signs.

The persons responsible for the safety of the systemare under an obligation to ensure that:

• The basic planning work for the system and allwork relating to transportation, assembly,installation, commissioning, maintenance andrepairs are carried out by qualified persons andchecked by responsible, suitably skilled persons.

• These instructions and the motor documentationare made available at all times while work is inprogress.

• The technical data and specifications relating to thepermissible installation, connection, ambient andoperating conditions are taken into account at alltimes.

• The system-specific erection and safety regulationsare observed and personal protective gear is used.

• Work on these machines, or in the vicinity of thesemachines, by unqualified persons is prohibited.

These instructions therefore only contain theinformation, which is necessary for the motors to beused by qualified persons in accordance with theirintended purpose.

Note

We recommend engaging the support and services ofyour local Siemens service center for all planning,installation, commissioning and maintenance work.

1.3 Operation in locations subject toexplosion hazards

Note

1LA8 Motors are designed and manufactured foroperations in safe zones only

Danger

Binding clarification of the local risks and of anymeasures necessary is only possible by the userof the installation in agreement with thesupervisory authority responsible.

Installation-specific ignition hazards

The criteria for the respective zonal classification arenot harmonized and the assessment of the operationalrisks, the local operating conditions and the variousmonitoring methods is not uniform. Accordingly, theremedial measures recommended by the supervisoryauthorities also differ in some cases, depending on theauthority’s area of responsibility. It is not possible forthe machine manufacturer to issue generallyapplicable recommendations in this respect.

Note

Binding clarification of the local risks and of anymeasures that should be recommended is onlypossible by the user in agreement with the supervisoryauthority responsible for the respective installation.

1.4 Electromagnetic compatibility

Instructions relevant for safety

Notice

If the load torque is very irregular (e.g. when driving areciprocating compressor) a non-sinusoidal motorcurrent will be induced whose harmonics might bringabout an excessive reaction on the supply system andso cause excessive emitted interference on the powersupply connecting leads.

Notice

If operated through a frequency converter, the emittedinterference is varying in strength, depending on thedesign of converter (type, interference suppressionmeasures and manufacturer). In order to avoidexceeding the limit values on the drive system,consisting of motor and converter, the EMCinformation given by the converter manufacturer muststrictly be observed. On motors with integratedsensors (e.g. PTC thermistors) it is possible thatinterference voltages caused by the converter occur onthe sensor lead.

If using motors with integrated sensors, the operatorhimself must ensure sufficient interference immunityby selecting a suitable sensor signal lead and a suitableevaluation unit.

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2 Description, technical data

2.1 Scope of delivery

Checking the scope of delivery for completeness

When you take receipt of the delivery, please checkimmediately whether the scope of the delivery matchesup with the accompanying documents. Siemens will notaccept any warranty claims relating to items missingfrom the delivery that are submitted later.

Register a complaint about:

– Any transport damage detected immediately withthe delivery agent.

– Any defects/incomplete delivery detectedimmediately with the SIEMENS representativeresponsible.

These Operating Instructions belong to the scope ofdelivery and must be kept where they can be easilyaccessed.

2.2 Siemens Service Center

Contact for further information

Details about the design of the three-phase motorsupplied and about the permissible operating conditionsare described in these Operating Instructions.

If you have any questions or suggestions, or if yourequire further information, please contact theSiemens Service Center.

2.3 Applications

Overview

1LA8 three-phase AC machines have been designedfor a very wide range of drive applications and energyconversion applications. This series distinguishes itselfas a result of its ruggedness, high lifetime andreliability. Not only this, it is extremely versatile, whichallows it to be optimally adapted to the particularapplication and function.

A description of the motor and permissible operatingconditions are specified in this documentation.

2.4 Design of the motor

Standards

The motors are compliant with the followingstandards:

• IS: 325: Specification for three phase inductionmotors

• IS: 900: Code of practice for installation andmaintenance of induction motors.

• IS: 4691: Degree of protection provided byenclosure for rotating electrical machinery

• IS: 7816: Guide for testing insulation resistance ofrotating machines.

• IS: 12065: Permissible limits of noise level forrotating electrical machines.

• IS: 12075: Mechanical vibration of rotatingelectrical machines with shaft heights 56mm andhigher – Measurement, Evaluation and Limits ofVibration severity.

• IEC: 60034-1: Rotating electrical machines – Part 1:Rating and Performance.

• IEC: 60034-5: Degree of protection for rotatingelectrical machines.

Cooling and ventilation

The series 1LA8 motors are totally enclosed fan-cooledthree-phase squirrel cage motors with an internal air-cooling circuit for cooling.

Located at the non-drive end of the stator housing isan air intake cowl that guides the external air. Theexternal air is drawn in through an opening in the airintake cowl and flows axially across the outer coolingribs of the motor frame. The fan impellers for the innerand outer cooling airflow are mounted on the motorshaft. The cooling method is as per IC411 (or IC4A1A1)of IEC 60034-6.

CautionNormally, external fans for two-pole motors areunidirectional, and for machines with four ormore poles are bidirectional. Machines withunidirectional external fans are identified on theFan cowl with an additional label showing thedirection of rotation. The internal fans aregenerally bidirectional. In the event that the levelof cooling provided by the internal coolingsystem is not sufficient it is also possible to attacha separate fan. This type of fan provides asufficient level of cooling irrespective of thespeed of the main motor. Temperature sensorsare integrated in the stator winding to monitorthe winding temperature. Various supplementarydevices can be integrated or mounted,depending on the order. These include, forexample, anti-condensation heating, bearingtemperature monitoring or other devices.

Rotor and rotor winding

The rotor assembly is pressed onto the shaft togetherwith the squirrel cage winding. The drive end of theshaft usually has a cylindrical shaft end.

Storing

The motors are equipped with different types ofrolling-contact bearings depending on the version andthe operating conditions described in the order. Thedifferent types are listed on the lubrication plate of themotor. In converter operation an insulated bearing isusually installed on the non-drive end.

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CautionCompliance with the permissible loads for theforces at the end of the shaft must be ensuredin accordance with the catalog data, asotherwise bearing damage may occur.

2.5 Main Terminal boxes

The terminal box can be arranged either on the left orright of the machine. It is not possible to subsequentlyswap the position to the other side of the machine at alater date. Please consult Siemens if you subsequently

need to convert the machine to the next larger size ofterminal box. Depending on size, the followingterminal boxes are generally used for connecting thecables:

Motor Type Main Terminal Box

1LA8 31-2..8 1XB7 622

1LA8 353/355-2..8 1XB7 622

1LA8 357-6..8 1XB7 622

1LA8 357-2..4 1XB1 631

1LA8 40-4 1XB1 631

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Main Terminal Box - 1XB7 622

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Main Terminal Box - 1XB1 631

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3 Transport, installation andassembly

3.1 Transport, storage

Transport damage

The shipping company must be notified immediatelyof any damage detected after delivery of the machine.The machine must not be put into operation if anydamage is found.

Transportation

CautionThe supplied rotor-locking device must bemounted during transportation in order toprevent damage to the motor. Do not removethis device until before the power take-offelement is fitted. If the motor has to betransported after the power take-off element isfitted, other appropriate measures must betaken to fix the axial position of the rotor (seeillustration below).

Vertical-design motors must always betransported in the vertical position if the rotor isnot locked. If transport in a horizontal positionshould prove to be necessary in special cases,the rotor must be locked again before themachine is turned. Vertical motors with suitablebearings can be supplied in the horizontalposition from the manufacturing plant.

Rotor locking device without (1) and with (2) coupling

Key: 1 sleeve, 2 coupling, 3 clamping device,4 shaft bolt

Tightening torques for the shaft bolt of the rotorlocking device

Thread in the Tightening Preloadshaft end torque

M20 50 Nm 12 kN

M24 100 Nm 20 kN

M30 180 Nm 32 kN

Warning

The motors may only be transported and hoistedin a position corresponding to their type ofconstruction (i.e. horizontal construction types inhorizontal position and vertical constructiontypes in vertical position. The motors may only behoisted using the hoisting lugs provided on thestator housing. Use appropriate rope guidance orspreading equipment (for weight see rating plateor technical data).

Warning

Only the intended openings, eyebolts and liftingpin on the base plates may be used fortransporting motor sets. Always pay attention tothe carrying capacity of the lifting device. Motorsets must not be lifted by attachment to theindividual motors.

For lifting assembled machine sets (such asbuilt-on gearboxes, fan units), always use thelifting eyebolt(s) or lifting pegs provided onboth the units! Machine sets should not be liftedby suspending the individual machines! Checkthe lifting capacity of the hoist!

Note: The motors should not be lifted using the centreholes on the shaft DE and NDE, because the weight ofthe motor shall harm the bearing and reduce itsperformance and operational life.

Storage

Storing outdoors

If possible choose a dry storage location safe fromflooding and free from vibrations. Repair any damageto the packaging before putting the equipment instorage, in so far as this is necessary to ensure properstorage conditions. Position machines, devices andcrates on pallets, wooden beams or foundations thatguarantee protection against ground dampness.Prevent the equipment from sinking into the groundand the circulation of air underneath the equipmentfrom being impeded.

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Covers or tarpaulins used to protect the equipmentagainst the weather must not make contact with thesurfaces of the equipment. Ensure adequate aircirculation by positioning wooden spacer blocksbetween the equipment and such covers.

Storing indoors

The storage rooms must be dry, free from dust, frostand vibrations and well ventilated. They must alsoprovide protection against extreme weather conditions.

The motors must be protected against shock andhumidity. The rotor-locking device should be installedwhen the device is put into storage.

Notice

If a motor is not put into operation immediately, itshould be stored in a dry room free from dust, frostand vibrations. Aggressive gases should not be presentin the ambient air.

CautionIf storage conditions are inappropriate there is arisk of bearing seizure damage.

Preservation (mothballing)

If motors are to be put into storage for longer than 6months, then they must be checked every 6 months toensure they are in good working order and anynecessary maintenance work must also be carried out.Document all preservation measures taken, so thatthey can be reversed before the motors are put backinto service. Slightly heat the windings of motorsconstantly and ensure good air circulation.

CautionIf the motors were supplied with a shippingbrace, secure the rotor in accordance with theinstructions for the shipping brace in order toprevent vibration damage to the bearings.

If the motors are equipped with condensationdrain holes, remove the screw plugs at regularintervals, let the condensation water drain offand refit the plugs.

Caution(Environmental Protection)

Disposal of packing material: On unpacking themotors, the packing material shall be disposedas per the Local / Statutory requirements.Special attention should be given to Polythenebags, thermocole packing and nylon straps etc.,which are not biodegradable.

3.2 Installation

Instructions relevant for safety

• After installation, screwed-in lifting eyebolt(s)should either be removed or tightened down.

• Remove rotor locator (when provided) from shaftextension. Check the free running of the rotor byrotating the shaft by hand.

• The shaft extension of the motor is coated with ananticorrosion agent. To remove this coating usekerosene / thinner. Do not use sandpaper or scraper.

• Before mounting the motor, see that the motor feetare properly cleaned.

• As a standard practice, the transmission elementsto be fitted to the motor should be dynamicallybalanced. Please note that the rotors of the motorsare dynamically balanced with half key inserted inthe shaft extension of the motor.

• Transmission elements must be fitted and removedonly by means of suitable tool.

• Install the motor in such a manner that the coolingair has free access and can escape unobstructed.Discharged air or hot air from neighboringequipment, must not be sucked in again. Clean theentire path of air over the motor (between ribs andair inlet in fan cowl) at regular intervals to removeany foreign deposits, preferably by means ofcompressed air.

• Motors are provided with plugged drain-holes,located at lowermost point on both the end shieldsfor drainage of condensate water. Please ensurethat these holes are the lowest point of the motor.If necessary rotate the end shield.

• For foot mounted motors to be fixed on the wall asupport should be provided for the mounting feetfrom below.

• In the case of motors with shaft end facingupwards or downwards, measures must be taken(by the user) to ensure that no water or dust canpenetrate into the upper bearing.

• Initial lubrication of the bearings is carried out inworks. Bearings must be regreased when the motoris running.

• If the belt drive is used, install the machine in sucha manner that it can be shifted on its base (e.g. onslide rails) to obtain correct belt tension. Excessivebelt tension may result in damage to the bearingand/or shaft. For permissible radial loads on shaftextension and recommended pulley sizes refer theSiemens catalog or contact local Siemens office.

Caution

Excessive belt tension may result in damage tothe shaft bearings; for permissible values, seecatalog or enquire.

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Quiet running

Stable foundations or mounting conditions, exactalignment of the motors and a well-balancedtransmission element are essential for quiet vibration-free running. If necessary, shims should be insertedunder the motor feet to prevent strain.

CautionWhen routing cables or other parts or componentsclose to or next to the motor frame, it should betaken into account that the motor frame could beat a high temperature during operation.

Take careful note of the technical data specified in themotor documentation and on the plates on the motorframe! The following conditions must also beobserved:

Shipping brace

If any shipping braces are in place, remove thembefore installation.

Cooling

The cooling air must be able to be drawn-in anddischarged unimpeded; ensure that warm dischargedair is not drawn back in at the air intake. On the verticalmotor design with air intake from above, the air inletsmust be protected against the ingress of foreign bodiesand water, preferably by using a protective Canopy.

Balancing quality

The rotors are dynamically balanced. For shaft endswith keys, a half key is inserted into the motor shaft formaintaining balancing quality.

Please make sure that the power take-off element iscorrectly balanced e.g. half-coupling, pulley, etc.Power take-off element may only be fitted or removedusing suitable equipment.

Balancing, transmission elements

A suitable device should always be used for fitting andremoving the transmission elements (coupling halves,pulleys, pinions).

As standard, the rotors are dynamically balanced withthe half key inserted.

When fitting the transmission element, keep the typeof balance in mind! Balance with half key.

Warning

The usual measures should be taken to guardtransmission elements from touch. If a motor isstarted up without transmission elementattached, the key should be secured to preventit being thrown out.

Due attention should be given to the measuresnecessary to prevent accidental touching ofrotating parts (couplings, pulleys, etc.).

Caution

The keys are only secured against falling-outduring transport. If the motor has two shaftends, and a power take-off element is only fittedto one end, steps must be taken to prevent thekey at the other end from being slung out.

Noise emission

When assessing the noise that is emitted at aworkplace (if any), it should be taken into account thatthe A-weighted sound pressure level, (measured inaccordance with IS: 12065: “Permissible limits of noiselevel for rotating electrical machines”), may be higherwhen the three-phase AC motors are operated withthe rated output.

Water drain holes

In the bearing end shields on the drive end and non-drive end, water drain holes are situated in the footarea and opposite the regreasing devices. They aresealed with plastic plugs. If there is a risk ofcondensation forming in the motor (e.g. due to severefluctuations in ambient temperature or directsunlight), it may be useful to remove the plugs locatedat the bottom after installation.

Note

Nominally the degree of protection of the motor isreduced to IP44 by removal of the plug.

Rolling-contact bearings

The permissible values for axial and radial forces are tobe taken from the catalog, or inquiries should be madeas necessary.

Installation surfaces

Make sure that the surfaces for the foundations areleveled and that the installation surfaces for the motorare parallel to the surface of the foundations. Theundersides of the feet of the machine must be cleanedbefore installation.

3.3 Aligning

Instructions relevant for safety

Detailed specialist know-how is required about thenecessary measures in order to correctly align andsecurely mount the equipment, e.g. for

• Preparing the foundation,

• Selecting and mounting the coupling,

• Measuring the concentricity and axial eccentricitytolerances,

• Axial and horizontal positioning.

If personnel are not familiar with the necessarymeasures and working steps, we recommend that theservices of the local SIEMENS service center be used.

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Vertical and horizontal position

The following measures are required in order tocompensate any radial offset at the coupling and tohorizontally adjust the electric motor with respect tothe driven load:

Place shims under the motor feet to position itvertically and to avoid stressing/distorting themachines. The number of shims should be kept as lowas possible i.e. stack as few as possible.

To horizontally position the machine, push it laterallyon the foundation and ensure that the axial position ismaintained.

When positioning the motor, ensure that there is auniform axial gap around the coupling.

3.4 Mounting

Overview

In order to ensure smooth, vibration-free motoroperation, a stable foundation design is required, themotor must be precisely aligned, and the components,which are to be mounted on the shaft end, must becorrectly balanced.

Notice

Please refer IS: 12075: Mechanical vibration of rotatingelectrical machines with shaft heights 56mm andhigher – Measurement, Evaluation and Limits ofVibration severity.

Note

Motors that are attached by their mounting feet to thewall (IMV5 or IMV6 construction) must be supportedby a wall strip.

Where belt drive is used it is of advantage to usesliding rails to mount the motor so as to be able to setthe correct belt tension.

CautionThe bearings and shaft can be damaged if thebelt tension is too high. It is essential, therefore,that you adhere to the permissible values.

Use machine fixing bolts with the necessarystrength class to IS: 1367-Part 3 (ISO 898-1)(e.g. 10.9) for reliable mounting and safetransmission of forces resulting from torque.When selecting the bolts and the design of thefoundation you must take into account themaximum forces occurring in the case of a fault(e.g. short circuit or system transfers in phaseopposition).

3.5 Connecting the ground conductor

Connection to the motor

The motor earth conductor cross-section must becompliant with the installation and erectionregulations, for example in accordance with IS: 3043for cross-sections greater than 35 mm² of the phaseconductor, with a minimum of 50% of the cross-section of the phase conductor.

There is a hexagon bolt with flat and spring washer onthe stator frame at the designated connecting pointfor the earthing conductor. This is suitable to connectmulti-core conductors with cable lugs or straps withappropriate conductor ends.

When making connections, ensure that

• The contact surface is clean and bright, and isprotected with a suitable anticorrosion agent, e.g.Acid-free Vaseline.

• The flat and spring washers are located under thebolt head.

• The maximum permissible clamping thickness forthe cable lug or strap of 10mm is not exceeded.

• The minimum required screw-in depth and thetightening torque for the clamping bolts as given inthe following table are observed.

These differ depending on whether cable lugs or earthterminals are used:

Tightening torques of bolts (cable lug)

Bolt Screw-in depth Tightening torque

M12 x 25 > 16 mm 38 Nm

M16 x 35 > 20 mm 92 Nm

Tightening torques of bolts (earth terminals)

Bolt Screw-in depth Tightening torque

M6 > 9 mm 8 Nm

M8 > 12 mm 20 Nm

M10 > 15 mm 40 Nm

M16 > 20 mm 170 Nm

Connection in the terminal box

In the terminal box, the labeled connection terminalsfor the ground conductor should be used.

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3.6 Connection of the motor

Overview

Danger

All work on the motor must only be performedby qualified personnel, with the motor in astationary state. The supply should be securedso that it cannot be switched back on again.Check that no voltage is present beforecommencing work.

The type designation of the terminal box forconnecting the power cables can be found in thesection entitled “Technical data”; refer to the spareparts list entitled “Main terminal box” for a diagram ofthe terminal box. Connecting cables can be sealed andsecured at every entry point into the terminal box.Suitable entry plates can be rotated through 180°.

The necessary connection data regarding

• The direction of rotation,

• The number and arrangement of the terminalboxes,

• The circuit and connection of the motor windingare specified in the section entitled “Technicaldata”.

The permissible direction of rotation can also be seenon the motor rating plate.

Examine the rating plate data and ensure that itmatches with the power circuit to which the motor isto be connected. Check to see that system voltage andfrequency agree with the data given on the ratingplate. Select the size of supply cables as required forthe particular current rating. Connect the supplycables in accordance with the connection diagramshown inside the terminal box cover.

Connection and arrangement of the terminal linksmust agree with the diagram provided in the terminalbox.

Before closing the terminal box ensure that:

– Interior of the terminal box is clean and free ofcable residue.

– All terminal screws and bolts are firmly tightened.

– Minimum air-clearance (>10mm upto 500V.>14mm upto 1000V) is maintained.

– Unused cable entries are sealed off with theplugging elements firmly screwed in.

– All sealing surfaces have adequate contact.

When the motors are provided with anti-condensationheaters, ensure that the supply to heaters is switchedoff before switching on the motor.

Before starting and during operation, make sure thatall the relevant safety and statutory regulationspertaining to the area of operation are complied with.

Earthing

Connect the earthing conductor to the terminal withthe earth marking in the Terminal box as well as on theStator housing.

Clean the area underneath the earthing terminal andsmear it with petroleum jelly before making earthingconnections.

Checking the insulation resistance

The insulation resistance of the windings must bemeasured prior to initial startup of the machine, andafter long periods of storage or standstill(approximately 6 months).

Warning

While the measurement is being taken andimmediately afterwards, some of the terminalscarry dangerous voltages and must not betouched.

Measurement

The insulation resistance of the windings to ground ismeasured with 500V DC. The winding temperatureshould be 30ºC±15ºC.

Checking

Minimum insulation resistance value (at 40°C) asspecified in IS: 4722 is Rm =kV + 1, where kV is therated voltage of the machine. Thus, for 415V ratedvoltage the insulation resistance of the winding shouldnot be less than 1.42 MOhm.

If less the winding must be suitably dried as per IS: 900

Connecting

Note

Ensure that there is a safe and reliable PE groundconnection before starting any work.

The connection must be made in such a way that apermanent, safe electrical connection is maintained(no protruding wire ends). Use the matching cable endpieces. Depending on the parts fitted, the connectingparts may be suitable for connection with or withoutcable lugs.

In some cases a terminal strip is installed in the mainterminal box for the auxiliary circuit connections. Theconnecting terminals of the auxiliary circuits aresuitable for cable cross-sections of up to 1.5 mm2

(fine-wire) or 2.5 mm2 (single-wire). On conductors forauxiliary terminals, the length of insulation, whichneeds to be stripped, is approximately 6 to 9 mmdepending on the terminal type. When this length iscorrect the conductor reaches right into the terminalas far as it can go while the wire insulation reaches thecontact part of the terminal.

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Direction of rotation

Connection of the power cables in the phase sequenceL1, L2, L3 to U, V, W results in a clockwise rotation. Iftwo of the connections are swapped then the resultingdirection of rotation is counter-clockwise (e.g. L1, L2,L3 to V, U, W). On motors, which are only allowed torun in one direction, the rating plate shows an arrow,which indicates the permitted direction of rotation,and it also specifies the terminal connections for therequired phase sequence.

conductors should then be immediately greased usingneutral Vaseline in order to prevent reoxidation.

Notice

Aluminum flow is likely to occur after the conductorshave been connected due to the contact pressure. Thisshould be compensated for by re-tightening theclamping nuts after approximately 24 hours and thenagain after approximately 4 weeks.

Use of single-stranded cables

If high currents occur when using several single-stranded cables instead of multiple-stranded cables forthree-phase supply cables, high temperatures can begenerated at the materials around the entry points tothe terminal box as a result of eddy currents. Once thesystem has been taken into operation it is thereforenecessary to check that the temperature limits of theconnected power cables are not exceeded inoperation.

This temperature effect can be reduced by altering theconditions at the entry points or by using modifiedcable entry plates after consultation with themanufacturing plant.

Cable entry and routing

Connecting cables and in particular the PE groundconductor in the terminal box should be laid out in anopen arrangement, and they should preferably havespare length to prevent chafing of the cable insulation.

Auxiliary cables fed in externally must be routedseparately from the main cable and secured. Elementswith cable ties are located on the floor of the terminalbox next to the walls for this purpose.

Screw-type cable connections should normally be used(not included in the delivery scope). In special casesthe connecting cable is sealed at the cable entry pointusing a cutout seal insert and is fastened using a strainrelief device. The strain relief device can either belocated in the terminal box or externally.

We recommend the following procedure:

• Cut out the seal insert in such a way that itsopening is 1 to 3 mm smaller than the cablediameter. If the cable diameter is too small, thisshould be increased by applying a layer of suitablesealing tape around the conductor.

• After inserting the seal, make a termination tomatch the cable and connect an earthing cable toit. If the cable has external armoring, do not route itdirectly into the terminal box, but just up to thestrain relief device, which in this case should alsobe fitted externally. This prevents moisture frompenetrating into the terminal box.

• Unscrew the upper section of the tension reliefdevice and release the mounting screws for thelower section. Insert the cable with seal insert intothe gland opening. When the cable is positionedconcentrically inside the gland opening, screw thetension relief clamp together and appropriatelyretain it.

Direction of rotation of the motor when looking at the driveend

Note

These restrictions in terms of the direction of rotationrelate to the particular type of motor design and result,for example, from the use of unidirectional fans. Anyrestrictions in terms of the direction of rotationresulting from the installation itself are not shown inthe information on the rating plate and need to beconsidered separately when making the connections.

Connecting using cable lugs

When using cable lugs to make the connection, thechoice of cable lug size must match the requiredconductor cross-section and the bolt size. A sloped/angular arrangement is only permitted provided therequired air insulation gaps are met. Remove theinsulation from the conductor ends, so that theremaining insulation is almost long enough to reachthe cable lug.

Note

The current-carrying capacity of the connection isguaranteed using the CuZn contact nuts. These nutsmust not be replaced with parts manufactured fromdifferent materials.

Connection without cable lugs

The design of the terminals makes it possible toconnect fine-wire conductors without the use of wireend ferrules. Wire end ferrules may only be used, ifthese are attached, before connecting-up, using thecorrect, current-carrying compression technique.

Notice

If the terminal link is used, the current-carryingconnection is guaranteed using CuZn contact nuts.These nuts must not be replaced with partsmanufactured from different materials.

Aluminum conductors

If aluminum conductors are connected, werecommend removing the oxide coating layer using abrush or file prior to inserting them in the clamps. The

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Cable grip and sealing insert

Note

Tighten the strain relief clamp screws; so that therequired clamping effect is achieved without damagingthe cable insulation, a tightening torque of 5 Nm isrecommended (see Fig.).

Internal PE ground conductor connection

The PE ground conductor connection between thegrounding terminal in the box enclosure and the motorenclosure is made by means of the mounting screws ofthe terminal box. The standard terminal box covermounting screws are adequate as potential bondingbetween the terminal box cover and terminal boxitself.

The equipotential bonding between the terminal boxcover and the box enclosure is provided by means ofthe standard cover mounting screws. A specialexternal ground cable is only installed if, for example,flat seals are mounted without additional support.When performing any installation work you mustalways take care to ensure that all equipotentialbonding measures remain effective.

Final checks

Please check that:

• The electrical connections in the terminal box havebeen made in accordance with the specificationsabove and tightened to the required tighteningtorque.

• The air gaps between non-insulated parts aremaintained:

≥ 8 mm up to 500 V, ≥ 10 mm up to 660 V and ≥ 14mm up to 1000 V.

Be aware of protruding wire ends when checking this.

• The connecting cables are laid in an openarrangement, so that the cable insulation cannotbe damaged during operation.

• The motor is connected-up corresponding to thespecified direction of rotation.

• The inside of the terminal box is clean and free ofany cable pieces.

• All gaskets and seals are undamaged.

• Unused openings in the terminal boxes are properlyclosed off.

Then close the terminal box and tighten the terminalbox cover screws to 22 Nm.

3.7 Connection to the converter

Temperature sensor

Whenever motors are labeled for operation with aconverter, they are usually equipped with an upgradedset of temperature sensors. This is because of thereduced effectiveness of the fan at lower speed rangesand the low temperature limits.

3.8 Converter operation on a groundednetwork

Parallel PE conductors

In the case of current-limited converters withoutground fault monitoring, PE conductor currents of upto 1.7 times the external conductor current can ariseif there is a ground fault on the output side. Neitherthe PE conductors of normally rated multi-coreconnecting cables nor the PE connecting points ofnormal terminal boxes are suitable for this purpose.In these cases a sufficiently dimensioned parallel PEconductor needs to be installed. This can then beconnected to the ground terminal positioned on themotor enclosure.

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4 Commissioning

4.1 Preparations

Safety instruction

Warning

Only expert persons should be entrusted withwork on power installations. All covers whichare designed to prevent active or rotating partsfrom being touched, or which are necessary toensure correct air guidance and thus effectivecooling, must be installed prior tocommissioning.

Commissioning

Note

Where the torque is very uneven (the drive of areciprocating type compressor, for example), theinevitable result is a non-sinusoidal motor current,whose harmonics can lead to excessive systemperturbation or excessive electromagnetic interference.

In case of converter-fed motors, high-frequencycurrent or voltage harmonics in the motor cables cangive rise to electromagnetic interference. This is whythe use of shielded cables is recommended.

Checking the insulation resistance

CautionThe insulation resistance needs to be checkedprior to commissioning and again after anyextended periods of storage or periods duringwhich the equipment is not in operation. Beforeyou begin measuring the insulation resistance,please read the manual of the insulationresistance meter you are going to use. Anycables of the main circuit, which are alreadyconnected should be disconnected from theterminals in order to carry out the insulationmeasurements.

Warning

During the measurement and immediatelyafterwards, some of the terminals are athazardous voltage levels and must not betouched.

Preferably measure the insulation resistance ofthe winding with reference to the motorenclosure when the winding temperature isbetween 20 and 45°C. When making themeasurement, you must wait until the finalresistance value is reached (approx. 1 minute).

Limit values

The table below shows the measuring voltage and thethreshold values for minimum insulation resistanceand critical insulation resistance.

Insulation resistance

Rated voltageUN < 2 kV

Measuring-circuit voltage 500 V DC

Minimum insulation resistance with 5 MΩnew, cleaned or repaired windings

Critical specific insulation resistance 0.5 MΩ/kVafter a long operating time

(values apply at a winding temperature of 35°C)

Note the following points:

• If the measurements are performed when the coiltemperature is not at 35°C, the measured valuewill need to be converted to the referencetemperature of 35°C in order to be able tocompare the values with the table above. Theinsulation resistance is reduced by a factor of ahalf for every 10 K increase in temperature, and itis increased by a factor of two for every 10 Kdecrease in temperature.

• Dry, new windings have insulation resistances ofbetween 100 and 2000 MΩ, or possibly evenhigher values. If the insulation resistance is close tothe minimum value, then the cause could either behumidity and/or dirt accumulation.

• Over its operating lifetime, the motor windinginsulation resistance can drop due to ambient andoperational influences. The critical insulationresistance for a 35°C winding temperature can becalculated, depending on the rated voltage, bymultiplying the rated voltage (kV) by the specificcritical resistance value (0.5 MΩ/kV); e.g. criticalresistance for a rated voltage (UN) of 690 V:690 V x 0.5 MΩ/kV = 0.345 MΩ

Notice

If the critical insulation resistance is reached orundershot, the windings must be dried or, if the fan isremoved, cleaned thoroughly and dried. After dryinga cleaned winding, please note that the insulationresistance is lower for windings in the warmcondition. The insulation resistance can only beproperly assessed after conversion to the referencetemperature of 35°C.

Notice

If the measured value is close to the critical value, theinsulation resistance should be subsequently checkedat appropriately shorter intervals.

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4.2 Measures to be taken prior tocommissioning

Overview

After assembling the motor in line with technicalrequirements and before commissioning the system,check that:

• The motor has been assembled and alignedproperly.

• The motor is connected up corresponding to thespecified direction of rotation.

• The operating conditions are in accordance withthe data specified on the nameplate.

• The bearings have been regreased (depending onthe version). Rolling-contact bearing motors whichhave been in storage for more than 2 years must beregreased.

• Any supplementary motor monitoring devices andequipment have been correctly connected and arefunctioning.

• Appropriately configured control functions andspeed monitoring equipment ensure that speedshigher than the permissible speeds stated on therating plate do not arise.

• The power take-off elements have the correctparameters for their type (e.g. alignment andbalancing of couplings, belt tension of a belt drive,backlash and crest clearance of a gear PTO drive,radial clearance).

• The minimum insulation resistance values and theminimum air gap values are satisfied.

• The earthing and equipotential groundingconnections have been correctly made.

• Any bearing insulation, which may be present, hasnot been bridged.

• All retaining bolts, connecting elements andelectrical connections have been tightened to thespecified torque.

• The rotor can be spun without coming into contactwith the stator.

• All shock-protection and guard measures formoving and live parts have been taken.

• If the second end of the shaft is unused, its key hasbeen secured so that it cannot be thrown out andthe open shaft end is covered.

• All separately driven fans fitted are ready foroperation and have been connected such that theyrotate in the direction specified.

• The flow of cooling air is not impeded.

• Brakes (if fitted) function perfectly.

• The indicated speed limit nmax cannot be exceededduring operation with a converter.

Note

The maximum speed nmax is the highest operatingspeed permitted for short periods. It should be kept inmind that motor noise and vibration are worse at thisspeed, and bearing life is reduced. (For details refercatalogue or contact nearest Siemens office).

Caution

After motor installation, the brake, if fitted,should be checked for proper functioning.

If the design of the motor requires that the converter isassigned in a particular way, the rating plate willcontain corresponding additional information.

Warning

This list does not claim to be exhaustive. It maybe necessary to make additional checks andtests corresponding to the actual plant/systemsituation.

4.3 Monitoring the temperature of thestator winding

Measures

In addition to the current-dependent overloadprotection device located in the connecting leads, werecommend that you also monitor the temperaturerise in the motor with the aid of the temperaturesensors embedded in the stator winding.

4.4 Energizing

Measures during commissioning

The following measures are normally recommendedafter installation or inspection work for standardcommissioning of the motors:

• Start up the motor without a load; to do this, closethe power switch and preferably do not switch itoff prematurely. Switching the motor back off againwhile it is starting up and still running at slowspeed should be kept to a bare minimum, forexample for checking the direction of rotation or forchecking the operation of the motor. Allow themachine to run to a standstill before switching itback on again.

• Check the mechanical operation for noises andvibrations at the bearings and bearing end shields.

• If the motor does not run smoothly and/or there areany abnormal noises, switch it off and determinethe cause as it slows down.

15

• If the mechanical operation improves immediatelyafter switching the motor off, then the cause ismagnetic or electrical. If the mechanical operationdoes not improve immediately after switching themotor off, then the cause is mechanical: e.g. animbalance in the electrical machines or in thedriven machine, inadequate alignment of themachine set, operation of the machine with thesystem resonating (system = motor, base frame,foundation etc.).

• If the motor runs perfectly in terms of itsmechanical operation, switch on any presentcooling devices (separate fan, water cooler orsimilar) and continue to monitor the motor for awhile as it idles.

• If it runs perfectly connect a load. Check that it runssmoothly, and record the values for voltage, currentand power. As far as possible, record thecorresponding values for the working machine aswell.

Warning

The vibration values encountered duringoperation must be satisfied in accordance withIS: 12075: Mechanical vibration of rotatingelectrical machines with shaft heights 56mmand higher – Measurement, Evaluation andLimits of Vibration severity, as otherwise themotor could be damaged.

• Monitor and document the temperatures of thebearings, windings etc. until the system reaches asteady state, in as much as this is possible with theavailable measuring equipment.

4.5 De-energizing

Measures during de-energizing

Anti condensation heaters if present should beswitched on automatically when the motor is de-energized.

If the corresponding control action does not take placeautomatically, switch on the anti-condensationheating if present.

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5 Operation

5.1 Safety information

Energizing the motor with anti-condensationheating (optional)

Caution

Before energizing the motor, always make surethat the (optional) anti condensation heating isswitched off.

Operating machines

Warning

All covers which are designed to prevent activeor rotating parts from being touched, or whichare necessary to ensure correct air guidance andthus effective cooling, must not be openedduring operation.

All deviations from normal operation (higherpower consumption, temperature or vibrationlevel, unusual noises or odors, trippedmonitoring devices, etc.) are indications that themotor is no longer functioning correctly. In thiscase, the maintenance technician must beimmediately notified in order to preventdisturbances that could either directly orindirectly lead to severe personal injury orsubstantial material damage. If in doubt, power-down the motor immediately in conformancewith the system-specific safety requirements!

Caution

The surfaces of the machines can reach hightemperatures, which can lead to burns in case ofcontact. That is why appropriate measures toavoid accidental contact must be taken.

Cleaning

To ensure proper functioning of the machine coolingsystem, the air ducts (grills, ducts, ribs, pipes) must befree of pollution / blockages.

CautionDuring machine operation, humid air cancondense inside the machine. Depending on theenvironmental and operating conditions,therefore remove the condensation water plugto drain the water. Afterwards, reinsert the plug.

5.2 Stoppages

Overview

For longer periods where the motor is not being used(> 1 month), either energize the motor regularly,approximately once a month, or at least spin the rotor.Read the instructions given in the “Start-up,Energizing” section before restoring the machine toservice. If a rotor-locking device has been fitted to themotor, you must remove it before you spin the rotor.

CautionIf the motor is not to be used for a period inexcess of 12 months, suitable anticorrosion,preservation, packaging and drying measuresmust be taken.

Switching on the anti-condensation heating

If an anti-condensation heating is provided, switch iton during the machine stoppages.

Placing the machine out of service

For details of required measures see “Transport,Storage” section.

Lubrication prior to recommissioning

CautionIf the motor has not been used for longer than12 months, it must be regreased before beingrestarted. The shaft must rotate so that the newgrease can be distributed throughout thebearings.

Pay attention to the instructions on thelubrication plate.

5.3 Fault diagnosis table

Overview

Note

In the event that electrical faults occur during theoperation of the motor with a converter, please alsorefer to the operating instructions of the frequencyconverter.

The tables below list general faults caused bymechanical and electrical influences.

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Fault table, electrical causes

Overview - Electrical faults

Electrical fault characteristics

↓ Motor will not start up

↓ Motor starts up slowly

↓ Drumming noise during startup

↓ Drumming noise during operation

↓ Drumming noise in time with twice the slip frequency

↓ High temperature rise during idling

↓ High temperature rise under load

↓ High temperature rise of individual winding sections

Possible causes of fault Remedial measures1)

x x x x Overload Reduce load

x Interruption of a phase in the supply Check switches and supply lines

x x x x Interruption of a phase in the Check switches and supply linessupply after switching on

x Mains voltage too low, frequency too high Check mains conditions

x Mains voltage too high, frequency too low Check mains conditions

x x x x x Stator winding incorrectly connected Check winding connections

x x x x Winding short circuit or phase Measure winding resistances andshort circuit in stator winding insulation resistances, repair after

consultation with manufacturer

x Defective soldered connection in Repair after consultation withshort circuit cage manufacturing plant

x Incorrect direction of rotation Check connections

(1) Apart from eliminating the cause of the fault (as described under “Remedial measures”), you must also rectify any damagethe motor may have suffered.

Electrical faults

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Mechanical faults

Fault table, mechanical causes

Overview - Mechanical faults

Mechanical fault characteristics

↓ rubbing/grinding noise

↓ high temperature rise

↓ radial vibrations

↓ axial vibrations

Possible causes of fault Remedial measures1)

x Rotating parts rubbing/grinding Determine cause and adjust parts

x Reduced air supply, fan possible running Check airways, clean motorin the incorrect direction of rotation

x Rotor not balanced Decouple rotor and rebalance

x Rotor out of true, shaft bent Consult Siemens

x x Poor alignment Align motor unit, check coupling2)

x Coupled motor not balanced Rebalance motor coupled up

x Shocks from coupled motor Check motor coupled up

x x Imbalance originating from gearing Adjust/repair gearing

x x Resonance of the overall system comprising After consultation, reinforce foundationmotor and foundation

x x Changes in foundation Determine cause of changes andeliminate; realign motor

(1) Apart from elimination the cause of the fault (as described under ”Remedial measures”), you must also rectify any damagethe motor may have suffered.

(2) Take any possible changes due to a rise in temperature into account.

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6 Maintenance

6.1 Maintenance

6.1.1 Preparations for maintenance

Instructions relevant for safety

Warning

Before starting any work on the motor or otherequipment, particularly before opening coversover live or moving parts, the motor must beproperly isolated from the power supply. Besidesthe main circuits, any additional or auxiliarycircuits that may be present must also be isolatedespecially the anti-condensation heating.

The “5 Safety rules” to be followed are:

– Isolate the equipment

– Take effective measures to preventreconnection

– Verify equipment is dead

– Ensure proper earthing connections

– Cover or fence off adjacent live parts

The precautions listed above should remain inforce until all maintenance work is finished andthe motor has been fully assembled.

Certain parts of the motor may reachtemperatures above 50°C.

When cleaning the motor with compressed air,ensure that suitable exhaustion measures areused and you use personal protective gear(goggles, face mask/filter or similar)!

If chemical cleaning agents are used, observethe instructions and any warnings.

Chemical agents must be compatible with themotor’s components/parts, especially when itinvolves plastics.

Caution(Environmental Protection)

The disposal of waste generated during operation& maintenance of the motor should be done as perthe applicable local environmental legislations.

Caution(Environmental Protection)

Waste Copper windings during repair andmaintenance - to be collected as segregatedwaste and sent to registered recyclers approvedby the respective State Pollution Control Board.

Note

Operating conditions and characteristics can varywidely. For this reason, only general maintenanceintervals can be specified here.

Note

Where motors are fitted with plugged drain holes,these should be opened from time to time to allow anyaccumulated condense water to be drained away.

Condense water openings should always be at thelowest point of the motor!

General

Periodic overhauling of the motor is recommended toensure long trouble free service.

Before starting the maintenance work, make sure thatthe supply is disconnected. These motors are providedclosely pitched ribs for effective cooling of the motor.These ribs should be cleaned at regular intervals eitherby oil free compressed air, or by scraping, dependingon the level of contamination.

The inside of the motor should be cleaned using drycompressed air during normal overhauling of themotor. Special care should be taken while cleaning thewindings to remove loose dust, moisture etc.

6.1.2 Bearings

Bearing and lubrication

All motors, as a standard feature, are provided withfloating bearing at Non-drive end and fixed bearing atDrive end. All motors are provided with regreasingarrangement (grease nipples).

Grease types

The regreasing intervals and the grease types arestated on the lubrication instruction plate of themotor. The motor must be regreased at least onceevery 12 months. The greasing instructions can befound on the lubrication instruction plate.

For standard applications, the initial greasing of thebearings is usually done with a grease suitable fortemperature range from –20°C to 130°C. If the motorshave been ordered for the extended operatingtemperature range below -20°C or above 130°C, thepermissible grease type is specified on the lubricationdata plate.

Unirex N3 of Exxon Mobil is the grease used inSiemens motors. This grease has Lithium soap asthickening agent and mineral oil as the basic oil.

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CautionGreases with different thickening agents andbasic oils must not be mixed.

Only in special cases should deviations be madefrom the usual greasing data. The regreasingintervals should be shortened for instance, if themotors are operated at ambient airtemperatures higher than originally allowed for,or if corrosive vapours occur or extremely heavycontamination is present.

To relubricate, clean the grease nipple and injectsuitable grease stipulated on the lubricationdata plate using a grease gun. The shaft mustrotate so that the new grease can be distributedthroughout the bearing. The bearingtemperature rises sharply at first, and thendrops to the normal value again when theexcess grease is displaced out of the bearing.The spent grease collects outside the bearingand must be removed after the bearing hasbeen lubricated several times, depending on thespecified regreasing intervals. The outer bearingcover must be removed in order to do so.Escaping oil at the bearing or oil escaping duringregreasing is an indicator that the space for thespent grease has been over-filled.

Remove the old grease while overhauling themachine.

Caution(Environmental Protection)

Waste grease & Greased cloth - to be collectedas hazardous waste and sent to hazardous wastedisposal facility for incineration.

Note

Motors provided with cylindrical roller bearings on thedrive end sides have very high dynamic capacity. Asper bearing manufacturers, the roller bearing performssatisfactorily only when it is radially loaded toapproximately 1-2% of its dynamic capacity. In view ofthis, the roller bearing may not run smooth when themotor is run uncoupled or with low radial load (e.g. Indirect flexible couplings).

6.1.3 Regreasing with sealing grease (option forincreased degree of protection)

Relubricating with sealing grease

In order to achieve optimum sealing and to reliablyseal the labyrinth joints with grease, the chamber mustbe relubricated at regular intervals. The procedure isthe same as that for lubricating grease. The necessaryrelubrication intervals depend essentially on the level

of dirt in the environment and on the ON time of themotor.

For this reason, they can only be defined taking intoaccount the respective operating conditions.

The sealing effect during operation is optimum as longas a small amount of relatively clean grease is forcedout. At the very latest, the chamber must berelubricated when no more grease escapes throughthe joints. The relubrication intervals during stoppagescan be extended accordingly as long as the sealinggrease forced out during relubrication is relatively freeof dirt.

6.2 Servicing

6.2.1 Servicing instructions

Faults

An inspection should be performed immediately in theevent of faults or exceptional operating conditionswhich represent an excessive load (either electrically ormechanically) for the motor (e.g. overload, shortcircuit).

Instructions for inspecting rolling-contact bearings

When servicing a motor, it is generally not necessary todismantle it. The first time a motor needs to bedismantled is when the bearings are to be replaced.

CautionThe required regreasing intervals for rolling-contact bearings are not the same as theservicing intervals. It is essential to adhere tothem.

CautionThe spent-grease chambers of the rolling-contact bearings only have enough room to takeup a limited amount of spent grease. When thegrease chamber is full, you must remove thespent grease before relubricating, because it willotherwise escape into the inside of the motor.Escaping oil at the bearing or oil escaping duringregreasing is an indicator that the space for thespent grease is full.

6.2.2 First service after installation or repair

Service criteria

After approximately 500 operating hours, at the latestafter 1 year

• Check, while the motor is running, that:

– The equipment conforms to the stated electricalcharacteristics.

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– The permissible bearing temperatures are notexceeded.

– The smooth running characteristics and motornoise in operation have not deteriorated.

• Check, while the motor is at standstill, that:

– The motor foundation has no indentations orcracks.

Further checks may be required in addition as a resultof additional operating instructions or in accordancewith the plant-specific conditions. Any impermissiblediscrepancies or changes found during the checksmust be rectified immediately.

6.2.3 Main service

Service criteria

After approximately 16 000 operating hours, at thelatest after 2 years

• Check, while the motor is running, that:

– The equipment conforms to the stated electricalcharacteristics.

– The permissible bearing temperatures are notexceeded.

– The smooth running characteristics and motornoise in operation have not deteriorated.

• Check, while the motor is at standstill, that:

– The motor foundation has no indentations orcracks.

– The motor is aligned within the permissibletolerance ranges.

– All of the mounting bolts for the mechanical andelectrical connections are tight.

– The winding insulation resistances aresufficiently high.

– If the bearings are insulated, the insulation hasnot been bridged.

– Cables and insulating parts and components arein a good condition and are not discolored.

6.3 Repair

6.3.1 Preparations for overhauling / repairs

Instruction relevant for safety

Note

If the motor has to be transported, please observe theinformation and instructions in the section entitled“Transport, storage”.

Caution(Environmental Protection)

Waste Copper windings during repair andmaintenance - to be collected as segregatedwaste and sent to registered recyclers approvedby the respective State Pollution Control Board.

Waste insulation material is a hazardous wasteand it should only be incinerated at anauthorized agency and not disposed by anyother means.

6.3.2 Dismantling

Overview

The drawings and part lists do not include any detaileddata about the type and dimensions of the fixingelements, etc.; thus, when you dismantle the motor,you should make a note of where the parts belong andmark them so that they can be easily re-assembled.

Use pullers or suitable devices to disassemble partsand components attached to the motor shaft. Beforeyou pull-off screwed parts and components, replacetwo of the fixing screws in the top of the parts to beremoved by long bolts or stud bolts, so that the partsare still supported after they have been removed.

6.3.3 Dismantling instructions

Pressing on and pulling off drive elements

Use the tapped hole provided in the end of the shaftfor fitting drive components such as couplings,gearwheels, belt pulleys etc. and, if possible, heat thecomponents as necessary. Use a suitable puller tool forremoving the components. Do not strike thecomponents, e.g. with a hammer or similar tool, whenfitting or removing them and do not exert more thanthe maximum value of radial or axial force – accordingto the catalog – transmitted to the motor bearingsthrough the shaft extension.

Fans

Radial fan impellers of plastic have two integrallymolded tongues, which engage with thecircumferential groove of the shaft to provide axialfixing. Before pulling the impeller these tongues mustbe disengaged and provisionally arrested in the raisedposition, e.g. by means of inserted shim plates. Thefan discs each have two openings for the insertion ofa pull-off device, which should be applied so as to acton the hub. Always use the appropriate tool forpulling fan impellers. The use of a hammer is notpermissible.

Cast iron fans are axial locked with separate circlip.Cast iron fans are best removed by engaging thepuller arms on the outer rim of the fan. In case oflarger fans, the puller holes provided on the hub canbe used.

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Rolling-contact bearing unit

It is recommended that the components that comprisethe active part of the bearing be marked to ensurecorrect assembly.

Removal of Bearings

For removing bearings use proper pullers. Reusablebearings, which are non-separable (e.g. Deep grooveball bearing), should be withdrawn by attaching pullerarms to the inner ring of the bearing. If it is a must toapply puller arms on the outer ring of the bearing, thebearing should be rotated during withdrawal to avoiddamage to the bearing.

Removal of bearings or inner rings which are not to be-used is facilitated by heating them with gas or weldingtorch.

Outer bearing seal

• V-ring with adjacent protecting ring

A bearing must be replaced if it is damaged. Damageto bearing is often difficult to recognize; in doubtfulcases, replace the bearing. Bearings, which have beenremoved, should be reused only if they show no traceof damage and provided they are thoroughly cleanedbeforehand.

For cleaning bearings use proper cleaning agent e.g.White spirit. Wear gloves.

Caution

The cleaned bearing must be free of foreignbodies (fibers from cleaning rags, hair frombrushes, etc.)

Caution(Environmental Protection)

The bearing to be discarded must be thoroughlycleaned from grease and should be intentionallydamaged (using weld marks or cutters etc) toavoid reuse.

The removed grease is a hazardous waste and isharmful to environment causing soil pollutionand water pollution. It should only beincinerated at an authorized agency and notdisposed by any other means.

Sealing

Clean and coat the bare joints between the parts andcomponents (e. g. between frames, end shields andbearing units) with a non-hardening, permanentlyflexible sealing compound, e.g. Hylomar MQ32 (followthe manufacturer’s application and safetyinstructions!).

Joint sealing

When reassembling machines with degree ofprotection IP56 (see rating plate), the joint betweenthe motor frame and the end shields are sealed withrubber ‘O’ rings. It should be ensured that these arenot damaged.

Installation of the rolling-contact bearings

Before installing the bearings, ensure that the partsand components, which are located on the shaft insidethe bearing, are put in place first. Take great care andpay attention to cleanliness when fitting andassembling the bearings. To fit the rolling-contactbearings, heat them up to about 80°C in oil or air andthen press them onto the shaft. Avoid any heavy blowsthat might damage the bearings. After cooling, greaseis to be filled in the bearing spaces completely, in-between the gaps of the rolling elements and in one-third open space, near the bearing, inside the innerbearing cover.

Dismantling the V-ring and adjacent protecting ring

Do not remove the press-fitted guard ring whendismantling!

Pull off the V-ring and bearing cover / bearing shieldfrom the shaft.

Afterwards press out the adhesively bonded protectingring using a suitable tool, taking care not to distort it.

6.3.4 Re-assembly

The motor must be assembled in a dust free, dry andclean location.

As the motor conforms to the type of protection IP55,all machined mating surfaces are provided with a thineven coat of bearing grease. Provide a fresh coat ofthis grease at the time of re-assembly.

Unmatched surfaces are provided with rubber gaskets.At the time of re-assembly, ensure that the gaskets arein good condition. Place the gaskets carefully toachieve the correct sealing. Replace the gaskets withthe new ones if the same are damaged.

All fasteners that are used on the exterior of the motorare provided with a coat of bearing grease to preventingress of water and dust through tapped holes.Ensure that the same is provided at the time of re-assembly.

Do not interchange location (DE & NDE) of bearingcovers, as the spigot dimensions may be different.

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Disc used as fitting tool

ungreased

3.10

greased

Pack two third of the bearing cavities with grease! Theouter bearing cover is kept free of grease to preventover greasing. The cavities in the outer bearing cover ismeant to collect spilled over / excess grease from thebearing assembly.

In case of regreaseable bearings, also fill the greaseducts in the end shield and the inner bearing cover.

6.3.5 Notes on assembling the bearing seal

V-ring with adjacent protecting ring

When assembling ensure that the seating on thebearing cover for the V-ring is not greased, but that thesealing surface is greased.

Threads, which are secured with liquid plastic, must betreated accordingly when they are tightened, e.g.using Loctite 243. Fixing bolts with a clamping lengthgreater than 25 mm must be reinstalled using suitableretaining elements or soluble locking compound (e.g.Loctite). The clamping length is taken as the distancebetween the head of the bolt and the point at whichthe bolt is screwed in.

Tightening torques

The bolted connections with metal contact surfaces(end shields, bearing cartridge parts, terminal box partsbolted onto the stator frame) should be tightened to thefollowing torques, depending on the thread size.

Tightening torques (tolerance ± 10%)

M4 M5 M6 M8 M10 M12 M16 M20 M24

A 1,2 2,5 4 8 13 20 40 – – Nm

B 1,3 2,6 4,5 10 20 34 83 160 280 Nm

C 3 5 8 20 40 70 170 340 600 Nm

The tightening torques in the different rows apply tothe following cases:

• Case A applies to electrical connections in whichthe permissible tightening torque is normallylimited by the bolt materials and/or the load-bearing capacity of the insulators (with theexception of the bus bar connections in case B).

• Case B applies to bolts/screws of property class 5.6(acc. to IS: 1367-Part 3 (ISO 898-1)) or to

bolts in components of lower strength (e.g.aluminum).

• Case C applies to bolts/screws of property class 8.8or A4-70 (acc. to IS: 1367-Part 3 (ISO 898-1)), butonly in screwed connections of higher strengthcomponents (e.g. gray cast iron, steel or cast steel).

Please refer to the relevant sections and drawings forall other tightening torques (electrical connections andbolted connections for parts with flat gaskets).

6.3.8 Spare Parts

When ordering spare parts, please indicate the correctMotor Type, Serial Number (as shown on the ratingplate) and also the correct part description. This willensure speedy and correct delivery of spare parts.Please refer to the exploded view of the motor.

Caution(Environmental Protection)

Disposal of the product at the end of its life:When it is decided that the product cannot berepaired and is to be disposed off, care shouldbe taken to adhere to Local / Statutoryenvironmental requirements. It should be notedthat the product contains grease, copperwindings, insulation materials that are notbiodegradable and are hazardous to theenvironment.

Re-assembly of the V-ring and adjacent protecting ring

The correct axial position of the V-ring has been reachedwhen the front of the bearing cap and the outer cornerof the V-ring are flush. The use of a suitable auxiliarydisc for assembly purposes is recommended.

To protect the V-ring against mechanical effects inspecial cases there may be a sheet metal protectingring fitted in the outer bearing cap. During installation,the protecting ring should be inserted in the centeringbore in such a way that one of its two slots coincideswith the water drainage slot provided at the low pointof its seat in the bearing cap or bearing shield.

6.3.6 Assembling the fan

Fans

Before mounting plastic radial fans on the shaft, makesure that the two integrally molded tongues, whichprovide axial location in the annular groove, areundamaged.

Fan cowls

The fan cowl is made of sheet steel and weldedtogether. When installing the sheet steel fan cowls,make sure that the retaining components are correctlyinstalled. In the case of unidirectional axial fans alsocheck the radial gap between the fan impeller and theair guide nozzle (≥ 2mm).

6.3.7 Bolt locking devices and tightening torques

Bolt locking devices

Nuts or bolts that are mounted together with locking,resilient and/or force distributing elements must berefitted together with identical, fully functionalelements. Always renew positive-action lockingelements.

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6.3.9 Exploded View – 1LA8 Motor

1PQ8 Page1/2 MTR 4.2-007

Additional Operating Instructions for Motors cooled by separately Driven Fans Note: To be read in conjunction with the 1LA8 Motor manual. Description

• Application Electrical machines are fitted with a separate fan unit, when the cooling provided by the fan, mounted on the rotor NDE extension, is insufficient, particularly at lower speeds. This happens to machines operating at wide-speed range. In such cases, this fan is driven through a separate motor called blower motor. The fan fits on an adaptor, which is fixed on the blower motor extension. The blower unit assures effective cooling irrespective of the speed of the main machine. This blower fan unit is fixed to the fan cowl through a fixing plate offering low air resistance.

• General , Connecting Up

Connect up the blower motor, and optional encoder, as shown in the connection diagram in the terminal box, with due regard to the associated instructions and rating plate data.

• Dismantling, Assembly 1. Fan Cowl with Fan unit Before the fan cowl is dismantled, the grease nipple should be removed. The fan unit needs to be removed only for repairs.

2. Fan Cowl with Fan unit + Encoder Before the fan cowl is removed, the connections from the auxiliary box of fan unit, encoder & the grease nipple should be removed. The fan unit needs to be first removed and the hex. nut fixing the torque arm to the fan cowl should be removed. The fan cowl can now be taken out. During reassembly it should be ensured that the fan rotates freely inside the cowl. Connect up the blower motor, and optional encoder, as given above.

17 Torque arm-optional 16 Encoder- optional 15 Coupling -optional 14 Washer 13 Hex screw 12 Terminal box- for 16 11 Terminal Box- for 2 10 Fan cowl

9 Washer 8 Hex screw 7 Fixing plate 6 Washer 5 Hex screw 4 Fan (plastic/steel) 3 Fan adaptor 2 Blower motor 1 Protection Cover

Siemens Ltd.MOT-02-120-041

Order No. 4I-0099-0118134 001

Product development is a continuous process. Consequentlythe data indicated in this booklet is subject to change withoutprior notice.

Siemens Ltd.

Automation & Drives - MotorsThane Belapur RoadThane 400601Fax: +91 22 27600076E-mail: motors.in@siemens.com

Time Prints030504