STARTING MOTOR GP-ELECTRIC 2049742 - Caterpillar

Operation Of Generator
SRCR Generator Wiring Diagram
FOR GENERATORS 8L50 & 8L78 A1 REGULATOR ASSEMBLYA2, 3 SUPPRESSION ASSEMBLYC1 SURGE CAPACITORC2, 3, 7 SUPPRESSION CAPACITORC4, 5, 6 RF1 SUPPRESSION CAPACITORCR1 CONTROLLED RECTIFIERCR3, 4 POWER RECTIFIERCR5 FIELD RECTIFIERCR7, 8, 10 SURGE SUPPRESSION DIODECR9 BLOCKING DIODEE1 MAIN HEAT SINKE3 AUX. HEAT SINKE4 SCR HEAT SINKF1, 2, 3 FUSEK1 BUILD UP RELAYL1 FILTER REACTORL2 SENSING REACTORL3 REVOLVING FIELDL4 STATORL5 SUPPRESSION REACTORL6 SCR REACTORL8 DIODE REACTORR1 REGULATOR GAIN RESISTORR2 REGULATOR GAIN POTR3 VOLTAGE DROOP POTR4 VOLTAGE LEVEL POTR5 RESISTANCE WIRER6 SURGE RESISTORT1 ISOLATION TRANSFORMERT2 VOLTAGE DROOP TRANSFORMER TB1, 2 TERMINAL BLOCK
FOR GENERATORS 8L51, 8L52, 8L69, & 8L84 A1 REGULATOR ASSEMBLYA2 SUPPRESSION ASSEMBLYC1 SURGE CAPACITORC2, 7 SUPPRESSION CAPACITORC4, 5, 6 RF1 SUPPRESSION CAPACITORCR1 CONTROLLED RECTIFIERCR3, 4 POWER RECTIFIERCR5 FIELD RECTIFIERCR7, 8, 10 SURGE SUPPRESSION DIODECR9 BLOCKING DIODEE1 MAIN HEAT SINKE3 AUX. HEAT SINKE4 SCR HEAT SINKF1, 2, 3 FUSEK1 BUILD UP RELAYL1 FILTER REACTORL2 SENSING REACTORL3 REVOLVING FIELDL4 STATORL5 SUPPRESSION REACTORL6 SCR REACTORR1 REGULATOR GAIN RESISTORR2 REGULATOR GAIN POTR3 VOLTAGE DROOP POTR4 VOLTAGE LEVEL POTR5 RESISTANCE WIRER6 SURGE RESISTORT1 ISOLATION TRANSFORMERT2 VOLTAGE DROOP TRANSFORMERTB1, 2 TERMINAL BLOCK
FOR ALL OTHER GENERATORS A1 REGULATOR ASSEMBLYA2, 3 SUPPRESSION ASSEMBLYC1 SURGE CAPACITORC2, 3, 7 SUPPRESSION CAPACITORC4, 5 6 RF1 SUPPRESSION CAPACITORCR1 CONTROLLED RECTIFIERCR3, 4 POWER RECTIFIERCR5 FIELD RECTIFIERCR7, 8, 10 SURGE SUPPRESSION DIODECR9 BLOCKING DIODEE1 MAIN HEAT SINKE3 AUX. HEAT SINKE4 SCR HEAT SINKF1, 2, 3 FUSEK1 BUILD UP RELAYL1 FILTER REACTORL2 SENSING REACTORL3 REVOLVING FIELDL4 STATORL5 SUPPRESSION REACTORL6 SCR REACTORL8 DIODE REACTORR1 REGULATOR GAIN RESISTORR2 REGULATOR GAIN POTR3 VOLTAGE DROOP POTR4 VOLTAGE LEVEL POTR5 RESISTANCE WIRER6 SURGE RESISTORT1 ISOLATION TRANSFORMERT2 VOLTAGE DROOP TRANSFORMER TB1, 2 TERMINAL BLOCKIntroduction
The Statically Regulated Controlled Rectifier Generator gives improved performance and longer service life by applying a method of excitation controlled by an automatic voltage regulation system that contains no moving parts. The generator voltage build-up system uses only one moving part: a relay, which operates only when the generator is started or shut down.Generation Of Voltage
The generator is constructed with the armature coils wound on stator (L4) and the field coils wound on the rotor, designated in the wiring diagram as revolving field (L3). The field coils are wound on magnetic steel that will retain a small amount of residual magnetism. The revolving field is connected directly to the engine flywheel through the generator shaft and coupling.As the engine turns revolving field (L3), a small amount of alternating current voltage is generated in stator (L4) by the influence of residual magnetism in the revolving field. A portion of this alternating current (AC) is rectified to direct current (DC) and is directed back to the revolving field to increase its magnetism. The procedure of excitation can be traced on the SRCR Generator Wiring Diagram by following the path of AC power from stator (L4).The AC current from phases 1 and 2 flows through wires (22 and 24) to terminals (TB2-4 and TB2-3), through wires (35 and 36), fuses (F1 and F2), wires (11 and 12), suppression reactor (L5), wires (56 and 57), to