Guardian Technologies 005336-1, 005337-1 Generator AC Lead Connections, ‹ 3-PHASE Alternators

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Standby Generator Sets

General Information

GENERATOR AC LEAD CONNECTIONS

See “Voltage Codes”. This generator may be rated at any one of three voltages, either single-phase or three-phase. The electrical wires in the unit’s AC con- nection (lower) panel should be installed according to the number of leads and the voltage/phase required for the application. If there are any questions regard- ing lead connection, refer to the wiring diagrams at the back of this manual.

Voltage codes apply to the type of stator assembly installed on a particular generator.

‹FOUR-LEAD, SINGLE-PHASE STATOR

Four-lead generators (see Figure 7.1) are designed to supply electrical loads with voltage code “A” (240V, 1-phase, 60 Hz). Electrical power is produced in the stator power windings. These windings were con- nected at the factory to the main circuit breaker as shown in Figure 7.1.

The rated voltage between each circuit breaker ter- minal is 240V. The rated voltage between each circuit breaker terminal and the neutral point 00 is 120V.

Figure 7.1 — Four-lead, Single-phase Stator

ALTERNATOR POWER WINDING CONNECTIONS

‹3-PHASE ALTERNATORS

The generator is designed to supply 3-phase electri- cal loads. Electric power is produced in the alterna- tor power windings. These windings were connected at the factory to the main circuit breaker with a “Y” configuration as shown in Figures 7.2 and 7.3.

The rated voltage between circuit breaker terminals E1-E2, E1-E3 and E2-E3 is either 480V or 208V depending on the model.

The rated voltage between each circuit breaker termi- nal and the neutral point 00 is either 277V or 120V depending on the model.

Figure 7.2 — Stator Power Winding

Connections - 3-phase, 277/480V (6 Lead)

S1

E1

 

INTERNAL

 

 

 

CONNECTIONS

 

 

 

 

 

 

 

L-L

S6

S4

 

 

 

 

NEUTRAL

 

 

 

 

 

 

 

S5

 

E3 S3

 

S2

E2

 

 

 

L-N

Figure 7.3 — Stator Power Winding

Connections - 3-phase, 120/208V (6 Lead)

E1

S1 S1

 

S4

 

S4

 

L-L

 

 

00 (NEUTRAL)

 

S6

 

S5

 

 

 

 

S3

S6

S5

 

S2

 

 

 

 

E3

S3

 

 

E2

 

 

 

S2

L-N

7-1

08/05

0 .Rev ACConn001

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Contents 20kW Models 005336-1 Standby Generator Sets Table of Contents  Warning   Electrical Hazards  ‹ Operation and Maintenance ‹ HOW to Obtain ServiceAuthorized Service Dealer Location IntroductionIdentification Record ‹ Data LabelEquipment Description Engine OIL RecommendationsCoolant Recommendations Engine Protective Devices Fuel System ‹ Fuel Requirements‹ Natural GAS Fuel System ‹ LP Fuel SystemSpecifications ‹ Reconfiguring the Fuel System ‹ Cold Weather KITAlternator Power Winding Connections ‹ FOUR-LEAD, SINGLE-PHASE Stator‹ 3-PHASE Alternators Generator AC Lead ConnectionsInstallation Preparation Before START-UPInitial Inspection for QT Genset Startup START-UP Checklist ‹ Preparation for START-UP‹ START-UP Inspection Operating Unit with Manual Transfer Switch Generator Control Operation‹ Engine START-UP and Transfer ‹ Retransfer and ShutdownMaintenance Performed by Service Facilities Cooling SystemChecking Fluid Levels ‹ Battery Fluid ‹ Check Battery‹ Exercise System ‹ Inspect Cooling System‹ Changing the Engine AIR Cleaner ‹ Coolant Change ‹ Changing Engine OIL‹ Spark Plugs Miscellaneous Maintenance Service Schedule Service Maintenance Interval InformationLevel Maintenance Level Troubleshooting Guide Problem Cause CorrectionStandby Generator Sets Standby Generator Sets Standby Generator Sets Standby Generator Sets Page Breaker Tray BACK/BOTTOM Page Assy RTR 20KW 2PH for Units Built Before February Page Components Included in 0G3365E Page Support Radiator LH Side Page Battery Tray C1 CPL Page Mounting Base 1.6L Page ASM Motor Stepper Page Engine Generac 1.6L NG Page Elbow 90D 3/4 NPT Page Roof C1 CPL Page Muffler C1 Page Page Page Page Page Page Page Page Page Page Page Page Page Page Standby Generator Sets Warranty

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