PI Manufacturing AC generators - Manual (Page 5)

CONTENTS
SECTION 6
ACCESSORIES 17
6.1 REMOTE VOLTAGE ADJUST (ALL AVR TYPES) 17
6.2 PARALLEL OPERATION 17
6.2.1 DROOP 17
6.2.1.1 SETTING PROCEDURE 18
6.2.2 ASTATIC CONTROL 18
6.3 MANUAL VOLTAGE REGULATOR (MVR) -
MX341 and MX321 AVR 18
6.4 OVERVOLTAGE DE-EXCITATION BREAKER
SX421 and MX321 AVR 18
6.4.1 RESETTING THE BREAKER 19
6.5 CURRENT LIMIT - MX321 AVR 19
6.5.1 SETTING PROCEDURE 19
6.6 POWER FACTOR CONTROLLER (PFC3) 20
SECTION 7 SERVICE AND MAINTENANCE 21
7.1 WINDING CONDITION 21
7.1.1 WINDING CONDITION ASSESSMENT 21
7.1.2 METHODS OF DRYING OUT GENERATORS 21
7.2 BEARINGS 23
7.3 AIR FILTERS 23
7.3.1 CLEANING PROCEDURE 23
7.4 FAULT FINDING 23
7.4.1 SX460 AVR - FAULT FINDING 23
7.4.2 SX440 AVR - FAULT FINDING 24
7.4.3 SX421 AVR - FAULT FINDING 24
7.4.4 TRANSFORMER CONTROL - FAULT FINDING 24
7.4.5 MX341 AVR - FAULT FINDING 25
7.4.6 MX321 AVR - FAULT FINDING 25
7.4.7 RESIDUAL VOLTAGE CHECK 26
7.5 SEPARATE EXCITATION TEST PROCEDURE 26
7.5.1 GENERATOR WINDINGS, ROTATING DIODES and
PERMANENT MAGNET GENERATOR (PMG) 26
7.5.1.1 BALANCED MAIN TERMINAL VOLTAGES 26
7.5.1.2 UNBALANCED MAIN TERMINAL VOLTAGES 27
7.5.2 EXCITATION CONTROL TEST 27
7.5.2.1 AVR FUNCTION TEST 27
7.5.2.2 RANSFORMER CONTROL 28
7.5.3 REMOVAL AND REPLACEMENT OF COMPONENT
ASSEMBLIES 28
7.5.3.1 REMOVAL OF PERMANENT MAGNET GENERATOR (PMG) 28
7.5.3.2 REMOVAL OF BEARINGS 28
7.5.3.3 REMOVAL OF ENDBRACKET AND EXCITER STATOR 28
7.5.3.4 REMOVAL OF THE ROTOR ASSEMBLY 29
7.6 RETURNING TO SERVICE 29
SECTION 8 SPARES AND AFTER SALES SERVICE 30
8.1 RECOMMENDED SPARES 30
8.2 AFTER SALES SERVICE 30
SECTION 9 PARTS IDENTIFICATION 32
TYPICAL SINGLE BEARING GENERATOR (Fig. 11) 33
TYPICAL TWO BEARING GENERATOR (Fig. 12) 35
TYPICAL TWO BEARING (SERIES 5) GENERATOR (Fig. 13) 37
ROTATING RECTIFIER ASSEMBLY (Fig. 14) 38