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MM-13- rev 01-EN

3

GENERAL SAFETY WARNINGS

Installation, operating and maintenance of electric generators can be potentially dangerous. All
precautions and measures must therefore be taken to prevent the occurrence of such dangerous
situations.

NOTICE

Electric generators are components with dangerous parts as they are live or have parts which
move while in operation.

Therefore:



incorrect use,



removal of protections without isolating the power supply,



disconnection of protection devices,



failure to perform inspections or maintenance,

may cause serious injuries to people.

In particular, maintenance interventions must be carried out exclusively by qualified staff i.e. persons
with specific knowledge, experience, appropriate professional training, knowledge of safety
regulations, standards, accident prevention provisions and working conditions. Safety managers
must authorise this staff to perform the necessary jobs and prevent any danger (also refer to IEC 364
Standard for the definition of qualified staff).
For jobs in plants with high electric currents, the access and work prohibition for unqualified staff is
ruled by the IEC 364 Standard as well.
This manual contains some of the symbols used to warn about any danger which could arise during
the various operations.
The symbols, together with relative wording “Danger”, “Caution” and “Warning” indicate the potential
risk from not complying with the prescriptions which they are coupled up with.
The following table gives the meaning of the symbols:

DANGER - RISK OF ELECTRIC SHOCK

Warning that there is a risk of electric shock if this notice is ignored

DANGER

Warning that there is a risk of serious injury if this notice is ignored

CAUTION

Warning that there is a risk of damage to persons and/or objects if this notice is
ignored

WARNING

Warning that there is a risk of damage to the generator or to the driving unit if
this notice is ignored

For reasons of general clarity, this manual does not contain all cases of operation, maintenance and
possible repairs. Therefore it mainly contains only the information required by qualified personnel
(see above) if the machines are used, as intended, as traction motors. In case of problems,
especially for more detailed information, we recommend you to always clearly indicate the machine
type and serial number.

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Содержание G Series

Страница 1: ...MM 12 rev 01 EN ASYNCHRONOUS THREE PHASE GENERATORS G LINE OPERATING INSTRUCTIONS ...

Страница 2: ... box 10 DOCUMENTATION 13 IDENTIFICATION OF THE GENERATOR 13 RECEIPT 14 GENERATOR HANDLING 14 STORAGE 14 INSTALLATION AND COMMISSIONING 15 Assembly and disassembly of the transmission component 15 Alignment 16 Vertical deviation 18 Axial displacement 18 Electric connections 20 OPERATION 22 OPERATING CONDITIONS 22 SAFETY NOTICE 22 CHECKS DURING OPERATION 22 Vibration check 23 MAINTENANCE 24 PREVENTI...

Страница 3: ...ents the access and work prohibition for unqualified staff is ruled by the IEC 364 Standard as well This manual contains some of the symbols used to warn about any danger which could arise during the various operations The symbols together with relative wording Danger Caution and Warning indicate the potential risk from not complying with the prescriptions which they are coupled up with The follow...

Страница 4: ...s made up of different executions both as protection degree and cooling type as described hereunder G C Line The G C Line generators are of the enclosed type provided with fins with external ventilation IC411 and IP54 protection degree This constructive solution allows to make a generator that can be installed also outdoors without any additional protection G W Line The G W Line generators are mad...

Страница 5: ...oise transmitted Reduce the vibrations transmitted to the foundation Avoid to raise dust in the room Reduce the dimensions of the machines G QN and G A Line The G A Line is made up by a self ventilated generator with IP23S protection degree The cooling air by means of a fan fixed directly on the generator shaft is normally sucked on the top and is ejected by proper grids placed on the bottom in co...

Страница 6: ...MM 13 rev 01 EN 6 All G Line generators are designed manufactured assembled and tested at our works in BEVERATE di BRIVIO Lecco ITALY ...

Страница 7: ...34 2 CLASSIFICATION OF DEGREES OF PROTECTION IP CODE IEC 60034 5 CEI EN 60034 5 METHODS OF COOLING IC CODE IEC 60034 6 CEI EN 60034 6 CLASSIFICATION OF TYPE OF CONSTRUCTION AND MOUNTING ARRANGEMENTS IM CODE IEC 60034 7 CEI EN 60034 7 TERMINAL MARKINGS AND DIRECTION OF ROTATION IEC 60034 8 CEI 2 8 BUILT IN THERMAL PROTECTIONS IEC 60034 11 MECHANICAL VIBRATIONS IEC 60034 14 CEI EN 60034 14 DIMENSION...

Страница 8: ...on Steel Shaft Steel C40 on request 39NiCRMd4 Terminal box Aluminium Steel Frame and stator The frame is the external envelope of the generator and besides the structural function it also conveys the cooling fluid and the cooling air In the W Line generators it also acts as a heat exchanger The stator core complete with the windings is placed inside the frame The stator lamination core consists of...

Страница 9: ...y means of copper rings These rings are welded to the bars using a welding process in an atmosphere of inert gas The realization of the rotor cage made as indicated above allows to reduce the rotor losses thanks to reduced resistivity and to obtain a higher efficiency and lower general heating of the machine Non drive end shield The non drive end shield is made in cast iron or steel and is fixed t...

Страница 10: ...me size 250 355 and in steel plate for bigger frame sizes has IP 55 or IP 56 protection degree provided that the connection of the supply cables is properly made Dimensions of terminal box and block for generators frame size 250 355 TIPO PRESSACAVO Type A B C D E F Cable Gland 160 180 188 86 82 52 M8 30 M40x1 5 200LT 188 86 95 60 M8 35 M40x1 5 200 225 225 103 95 60 M10 35 M50x1 5 250MT 225 103 115...

Страница 11: ...MM 13 rev 01 EN 11 Terminal block with 3 terminals Terminal block with 6 terminals provided with no 3 copper plates ...

Страница 12: ...encoder etc The auxiliary terminal boxes are of 3 types depending on the size of the generator and the number of electric connections required by the Customer and can be in aluminium up to frame size 355 or in steel generators frame size 400 560 Hereunder are mentioned the overall dimensions Aluminium auxiliary terminal box for generators frame size 250 315 Aluminium auxiliary terminal box for gen...

Страница 13: ...truments and position of accessories Upon customer request it is possible to issue an additional documentation containing items not included in this manual In case of conflict between this manual and the additional documentation of the machine the additional documentation will prevail IDENTIFICATION OF THE GENERATOR A plate containing rating data as well as electro mechanical data is fixed to the ...

Страница 14: ... possible the machine must be placed in a covered clean and dry place The temperature of the rooms where generators are stored should be included within 10 C and 50 C In case generators should be stored in heavier conditions it is necessary to consult Electro Adda SpA Technical Department when placing the order The storage place should possibly have a low humidity level Relative humidity below 75 ...

Страница 15: ...ly and disassembly of the transmission component The use of a flexible coupling is advisable for the mechanical connection of the generator This must be able to prevent the transmission of any axial or radial thrust to the bearings Normally the coupled machine must not transmit torsional vibrations to the generator shaft In the case of direct coupling it is necessary to pay particular attention to...

Страница 16: ...precise alignment it is necessary to use a metal ruler and a thickness gauge or alternatively one or two comparators After having mounted the two coupling halves onto the coupled machine and its generator and after having positioned the two machines having taken the precaution to leave the distance indicated on the overall dimensions drawing between the two coupling halves it is necessary to sligh...

Страница 17: ...ns can be applied between the machine and the rest surface Further refinement of alignment can be obtained using two comparators each joined to a coupling half which measure axial and radial oscillations in the different positions If the coupled machine works at temperatures higher than those of the generator in the alignment phase it is necessary to compensate the differences that can be determin...

Страница 18: ...length of the shaft and can be obtained from the following table Frame size Increase in mm 160 200 0 4 225 250 0 6 280 0 8 315 1 355 1 1 400 1 2 450 1 2 500 1 3 560 1 5 NOTE Make sure that between the coupling halves excluding rigid couplings the axial movement is free and continuous in order to permit expansion in case the runner is connected directly on the generator shaft it is necessary to ver...

Страница 19: ...osed water circuit with purified water Standard values for the cooling water to be used in the cooling system pH 6 0 8 0 Alkalinity CaCO3 1 mmol kg Chloride Cl 20 mg kg Sulphate 100 mg kg KMnO4 concentration 20 mg kg Al concentration 0 3 mg kg Mn concentration 0 05 mg kg The normal tap water fulfils the above values The cooling water must also be inhibited with an agent protecting the system again...

Страница 20: ...enerators in standard execution are made with 3 terminals only In some types with star connection an accessible star point is provided Direction of rotation is clockwise seen from the drive end when the phase sequence L1 L2 L3 is connected to the terminals U1 V1 V2 To reverse the direction of rotation exchange the connection of two of the terminals The dimension of the incoming cables must be suit...

Страница 21: ...s At the first commissioning of the generator apply at least the minimum grease quantity mentioned hereafter or until it comes out from the grease drain holes 1 Remove the drain plug and extract the old and used grease 2 With the generator running insert new grease into the lubricators and by means of the specially provided grease gun actuated by hand The grease quantity is shown in table 3 3 Let ...

Страница 22: ...normal operation anomalous current input high temperature or vibrations unusual noise or smell tripping of the protection devices are indicative for wrong operation In this case to avoid injuries to people or material damage immediately stop the generator perform the necessary checks and carry out maintenance If necessary contact ELECTRO ADDA SpA In order to operate correctly the electric generato...

Страница 23: ...d occur it is necessary to perform the programmed vibration measuring and to correct the rotor balancing Moreover before commissioning the unit it is always necessary to measure the vibration amplitude and speed at the generator supports in three different directions to verify if any harmful vibration takes place In case in whatever measuring direction vibration speeds higher than 7 mm s effective...

Страница 24: ...out periodical inspections to verify if any maintenance is necessary Generators have been designed and manufactured in a way to require little maintenance during normal operation To guarantee long life of the generator it is advisable to prepare an appropriate maintenance programme that takes into consideration the real operation and environmental conditions of the place where the generator is ins...

Страница 25: ...esence of solvents Before measuring the insulation resistance to evaluate the drying status sufficient for the application of voltage it is necessary to ensure that the winding is absolutely free from solvent The winding can also be cleaned using a light solution of water and detergent paying particular care and by specialised staff The pressure must be lower than 2 bar and temperature lower than ...

Страница 26: ...actory already complete with lubrication grease If the machine is stored for several months it is advisable to renew the bearing grease before starting the machine The lubrication interval is mentioned on the generator plate and on the data sheets concerning the generators If not otherwise specified these lubrication intervals refer to normal operation conditions in clean environments This period ...

Страница 27: ...tall the grease drain plug In case of automatic lubrication remove the grease drain plug permanently Cleaning the bearings The rolling bearing lubrication method tends to release the used grease from the collection chamber and therefore the grease does not require frequent total replacement However every time the generator is disassembled for general cleaning it is advisable to wash the bearings w...

Страница 28: ...n Heat the bearing in an oil bath at 70 80 C mount it onto the seat and hold it against the shaft shoulder until the bearing has cooled down SPARE PARTS Ordering spare parts On ordering spare parts it is necessary to supply a precise description of the requested component in addition to the features indicated on the generator rating plate and in particular the generator serial number The type of m...

Страница 29: ... quantitative measurement but only qualitative Generally for new generators in normal climatic conditions the insulation resistance value easily exceeds the value of 100 Mohm In the case of rewound generators or generators exposed to wet operating conditions the minimum insulation resistance value can be estimated around 20 Mohm at 15 30 C If the measurement is carried out at temperatures higher t...

Страница 30: ...ngs allows their correct live operation also with insulation resistance values equal to 1 10 of those prescribed previously it is advisable not to allow the insulation resistance to fall below the recommended values The variation through the time of the insulation resistance during application of the test voltage supplies an additional indication of the insulation conditions ...

Страница 31: ...MM 13 rev 01 EN 31 ELECTRO ADDA SpA VIA NAZIONALE 8 23883 BEVERATE di BRIVIO LC ITALY TELEFONO 39 039 53 20 621 TELEFAX 39 039 53 21 335 www electroadda com info electroadda com ...

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