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l Installation, operation and maintenance manual
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4.6.3Diode protection .......................................................................................................... 23
4.6.4Protections on the voltage regulator............................................................................. 23
4.6.4.1Protection against underfrequency ........................................................................... 23
4.7VOLTAGE REGULATOR ............................................................................................................. 23
4.8AUXILIARY EXCITER................................................................................................................... 23
4.9ELECTRICAL ASPECTS ............................................................................................................. 23
4.9.1Electrical connections .................................................................................................. 23
4.9.1.1Main connection....................................................................................................... 23
4.9.1.2Grounding ................................................................................................................ 23
4.9.1.3Electronic voltage regulator....................................................................................... 23
4.9.1.4Terminal identification ............................................................................................... 24
4.9.1.5Electrical connection of the voltage regulator ............................................................ 24
4.9.2Accessories ................................................................................................................. 24
4.9.2.1Excitation and sensing.............................................................................................. 24
4.9.2.2Parallel operation...................................................................................................... 24
4.9.2.3Differential protection................................................................................................ 24
4.10MECHANICAL ASPECTS ........................................................................................................... 24
4.10.1Bases and foundations ................................................................................................ 24
4.10.2Alignment and leveling ................................................................................................. 24
4.10.3Coupling ...................................................................................................................... 25
5START-UP .......................................................................................................26
5.1PRELIMINARY INSPECTION ...................................................................................................... 26
5.2INITIAL OPERATION................................................................................................................... 26
5.2.1Temperatures .............................................................................................................. 26
5.2.2Bearings ...................................................................................................................... 26
5.2.3Radiator ....................................................................................................................... 27
5.3SHUTDOWN............................................................................................................................... 27
5.4PARALLEL ALTERNATORS........................................................................................................ 27
5.4.1Parallel to each other and/or to the line........................................................................ 27
6MAINTENANCE................................................................................................28
6.1EMERGENCY GENERATOR GROUPS ....................................................................................... 28
6.2CLEANING ................................................................................................................................. 28
6.3NOISE......................................................................................................................................... 28
6.4VIBRATION................................................................................................................................. 28
6.5BEARINGS ................................................................................................................................. 28
6.5.1Lubrication................................................................................................................... 28
6.5.1.1Type and amount of grease...................................................................................... 28
6.5.1.2Instructions for lubrication......................................................................................... 28
6.5.1.3Relubrication of bearing with the alternator operating................................................ 29
6.5.2Bearing ........................................................................................................................ 29
6.5.2.1Bearing replacement ................................................................................................ 29
6.6MAINTENANCE OF THE EXCITER.............................................................................................. 29
6.6.1Exciter.......................................................................................................................... 29
6.6.2Diode test .................................................................................................................... 29
6.6.3Diode Replacement ..................................................................................................... 30
6.6.4Varistor test.................................................................................................................. 30
6.6.5Varistor replacement.................................................................................................... 30
6.7AIR FLOW................................................................................................................................... 30
6.8MAINTENANCE OF THE COOLING SYSTEM............................................................................. 30
6.8.1Maintenance of the radiators........................................................................................ 30
6.9ALTERNATOR OUT OF OPERATION.......................................................................................... 31
6.10SHAFT GROUNDING DEVICE .................................................................................................... 31
6.10.1Grounding with internal brush ...................................................................................... 31
6.10.2Grounding with external brush ..................................................................................... 31
6.11COMPLETE CHECKUP .............................................................................................................. 32
7DISASSEMBLY AND ASSEMBLY OF THE ALTERNATOR...................................33
7.1DISASSEMBLY........................................................................................................................... 33
7.2ASSEMBLY ................................................................................................................................ 33
7.3SPARE PARTS ........................................................................................................................... 33
