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8 l Installation, Operation and Maintenance Manual – Synchronous Motors – S Line – Brushless – Horizontal 11866576
4.6.1.1 Radiators for application with sea water .............................................................................. 24
4.6.2 Independent ventilation cooling .......................................................................................................... 25
4.7 ELECTRICAL ASPECTS ................................................................................................................. 25
4.7.1 Electrical connections......................................................................................................................... 25
4.7.1.1 Main electrical connections ................................................................................................. 25
4.7.1.2 Grounding .......................................................................................................................... 25
4.7.1.3 Field power supply and control ........................................................................................... 25
4.7.2 Connection diagram ........................................................................................................................... 26
4.8 MECHANICAL ASPECTS ............................................................................................................... 26
4.8.1 Foundations ....................................................................................................................................... 26
4.8.2 Foundation loads ............................................................................................................................... 26
4.8.3 Base types ......................................................................................................................................... 26
4.8.3.1 Concrete base .................................................................................................................... 26
4.8.3.2 Metal base.......................................................................................................................... 26
4.8.4 Natural frequency of the base ............................................................................................................. 26
4.8.5 Mounting ........................................................................................................................................... 26
4.8.6 Anchor plate set ................................................................................................................................. 27
4.8.7 Leveling ............................................................................................................................................. 27
4.8.7.1 Support .............................................................................................................................. 27
4.8.8 Alignment ........................................................................................................................................... 27
4.8.9 Inspection of pedestal bearings .......................................................................................................... 28
4.8.10 Couplings........................................................................................................................................... 29
4.8.10.1 Direct coupling ................................................................................................................... 29
4.8.10.2 Gear coupling ..................................................................................................................... 29
4.8.10.3 Coupling of motors equipped with sleeve bearings ............................................................. 30
4.9 BRAKE ........................................................................................................................................... 30
4.10 HYDRAULIC UNIT .......................................................................................................................... 30
5 STARTING ......................................................................................................... 31
5.1 DIRECT ON-LINE STARTING ......................................................................................................... 31
5.1.1 Direct start with discharge resistor ...................................................................................................... 31
5.1.2 Direct start without discharge resistor ................................................................................................. 31
5.1.3 Direct online start frequency ............................................................................................................... 31
5.1.4 Locked rotor current (Ip/In) ................................................................................................................. 31
5.2 STARTING WITH REDUCED CURRENT ......................................................................................... 32
5.2.1 Starting with reactor ........................................................................................................................... 32
5.2.2 Starting with autotransformer ............................................................................................................. 32
5.2.3 Starting with frequency inverter .......................................................................................................... 32
5.2.4 Starting with soft-starter ..................................................................................................................... 32
5.3 EXCITATION CIRCUITS .................................................................................................................. 33
5.3.1 Excitation circuit with voltage control (Random) .................................................................................. 33
5.3.3 Excitation circuit with frequency control .............................................................................................. 34
5.3.4 Excitation circuit for AC exciter ........................................................................................................... 35
6 COMMISSIONING .............................................................................................. 36
6.1 PRELIMINARY INSPECTION .......................................................................................................... 36
6.2 FIRST START ................................................................................................................................. 36
6.2.1 Initial starting procedure ..................................................................................................................... 36
6.3 OPERATION ................................................................................................................................... 37
6.3.1 Operation procedures ........................................................................................................................ 37
6.3.2 Resynchronization .............................................................................................................................. 37
6.3.3 Data recording ................................................................................................................................... 37
6.3.4 Temperatures ..................................................................................................................................... 37
6.3.5 Bearings ............................................................................................................................................ 37
6.3.5.1 High-pressure oil injection system ....................................................................................... 38
6.3.6 Radiators ........................................................................................................................................... 38
6.3.7 Vibration ............................................................................................................................................ 38
6.3.8 Vibration causes ................................................................................................................................. 38
6.4 SHUTDOWN ................................................................................................................................... 38
7 MAINTENANCE .................................................................................................. 39
7.1 GENERAL ....................................................................................................................................... 39
7.2 GENERAL CLEANING .................................................................................................................... 39
7.3 WINDING INSPECTIONS ................................................................................................................ 39
7.4 WINDING CLEANING ..................................................................................................................... 39
7.4.1 Inspections ........................................................................................................................................ 39
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