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8 l Installation, operation and maintenance manual – Squirrel cage motor – W Line - Horizontal and vertical 11239449
4.6.1 Cooling system characteristics ........................................................................................................... 25
4.6.2 Cooling water characteristics.............................................................................................................. 25
4.6.2.1 Cooling water temperature ................................................................................................. 25
4.6.3 Protection devices .............................................................................................................................. 25
4.7 ELECTRICAL ASPECTS ................................................................................................................. 26
4.7.1 Electrical connections......................................................................................................................... 26
4.7.1.1 Main electrical connections ................................................................................................. 26
4.7.1.2 Grounding .......................................................................................................................... 26
4.7.2 Connection diagrams ......................................................................................................................... 27
4.7.2.1 Connection diagrams according to IEC60034-8 .................................................................. 27
4.7.2.1.1 Stator connection diagrams ........................................................................... 27
4.7.2.2 Connection diagrams according to NEMA MG1 .................................................................. 28
4.7.2.2.1 Stator connection diagrams ........................................................................... 28
4.7.2.3 Rotation direction ............................................................................................................... 28
4.7.2.4 Accessory connection diagrams ......................................................................................... 28
4.8 MECHANICAL ASPECTS ............................................................................................................... 29
4.8.1 Foundations ....................................................................................................................................... 29
4.8.2 Foundation loads ............................................................................................................................... 29
4.8.3 Base types ......................................................................................................................................... 29
4.8.3.1 Concrete base .................................................................................................................... 29
4.8.3.2 Sliding base ........................................................................................................................ 29
4.8.3.3 Metal base.......................................................................................................................... 30
4.8.3.4 Anchor bolts ....................................................................................................................... 30
4.8.4 Natural frequency of the base ............................................................................................................. 30
4.8.5 Leveling…. ......................................................................................................................................... 30
4.8.6 Alignment.. ......................................................................................................................................... 30
4.8.7 Doweling… ........................................................................................................................................ 31
4.8.8 Couplings........................................................................................................................................... 31
4.8.8.1 Direct coupling ................................................................................................................... 32
4.8.8.2 Gear coupling ..................................................................................................................... 32
4.8.8.3 Belt drive ............................................................................................................................ 32
5 STARTING ......................................................................................................... 33
5.1 DIRECT ON-LINE STARTING ......................................................................................................... 33
5.2 DIRECT ONLINE STARTING FREQUENCY ..................................................................................... 33
5.3 LOCKED ROTOR CURRENT .......................................................................................................... 33
5.4 STARTING WITH REDUCED CURRENT ......................................................................................... 33
6 COMMISSIONING .............................................................................................. 34
6.1 PRELIMINARY INSPECTION .......................................................................................................... 34
6.2 FIRST STARTING ........................................................................................................................... 34
6.3 OPERATION ................................................................................................................................... 34
6.3.1 General…. ......................................................................................................................................... 35
6.3.2 Temperatures ..................................................................................................................................... 35
6.3.3 Bearings… ......................................................................................................................................... 35
6.3.4 Cooling system .................................................................................................................................. 35
6.3.5 Vibration…. ........................................................................................................................................ 35
6.3.6 Shutdown .......................................................................................................................................... 35
6.4 OPERATION AS ASYNCHRONOUS GENERATOR ......................................................................... 36
6.4.1 Operation.. ......................................................................................................................................... 36
6.4.2 Slip……… .......................................................................................................................................... 36
6.4.3 Precautions ........................................................................................................................................ 36
7 MAINTENANCE .................................................................................................. 37
7.1 GENERAL ....................................................................................................................................... 37
7.2 GENERAL CLEANING .................................................................................................................... 37
7.3 WINDING INSPECTIONS ................................................................................................................ 37
7.4 WINDING CLEANING ..................................................................................................................... 37
7.4.1 Inspections ........................................................................................................................................ 37
7.4.2 Reimpregnation .................................................................................................................................. 38
7.4.3 Insulation Resistance .......................................................................................................................... 38
7.5 COOLING SYSTEM MAINTENANCE .............................................................................................. 38
7.6 VIBRATION ..................................................................................................................................... 38
7.7 MOTOR OUT OF OPERATION ....................................................................................................... 38
7.8 SHAFT GROUNDING DEVICE ........................................................................................................ 38
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