SHAFT 4K6806 - Caterpillar

Three-Phase Voltage Connections
The Wye Configuration and the Delta Configuration are given in the following diagrams.The terminals must be connected securely. Insulate the terminals with good quality electrical tape.If a Delta Configuration is being used, the generator winding pitch must be two-thirds. If the generator winding pitch is not two-thirds, there will be circulating current within the Delta. This circulating current will cause additional heat in the generator stator. In such cases, the generator must be derated.Wye Configuration Diagrams
6 Lead Generators
Illustration 1 g00626053
Typical Wye Configuration (60 Hz Six Lead)
12 Lead Generators
Illustration 2 g00637319
Typical Series Wye Configuration (60 Hz Twelve Lead)
Only for 3406E, 3412C, and 3500 series generator sets
Typical high-voltage connection.
Illustration 3 g00637320
Typical Parallel Wye Configuration (60 Hz Twelve Lead)
Only for 3406E, 3412C, and 3500 series generator sets
Typical low-voltage connection.
Delta Configuration Diagrams
6 Lead Generators
Illustration 4 g00626129
Typical Delta Configuration (60 Hz Six Lead)
12 Lead Generators
Illustration 5 g00626130
Typical Delta Configuration (60 Hz Twelve Lead)
Single-Phase Current From a Three-Phase Generator
Three-phase current and single-phase current can be taken simultaneously from a generator that is connected for three-phase service. In the Wye Configuration, connect the load to the three-phase leads (any two of the three leads). In the Delta Configuration, connect the load to the three-phase leads (any two of the three leads). In both configurations, the connection will provide single-phase voltage at the same voltage as three-phase voltage.Connect the load to any phase lead and neutral lead of the Wye Configuration. This connection will produce voltage at 58% of three-phase voltage.In a Delta Configuration (240 Volts, 60 Hz, and three-phase power), the following voltages will be present: 208 Volts between the high phase and neutral and 240 Volts between either of the low phases and neutral.Refer to Operation Section, "Generator Operation" for allowable single-phase loading unbalance.Single-phase power that is taken from a three-phase source can be a problem. Ensure that the single-phase loading is equally distributed.Do not exceed the nameplate current rating for any one phase.Wye Configuration Diagrams
6 Lead Generators
Illustration 6 g00626132
Single-Phase Voltage Diagram with Six-Lead Wye Configuration
12 Lead Generators
Illustration 7 g00637321
Single-Phase Voltage Diagram with Twelve-Lead Wye Configuration
Only for 3406E, 3412C, and 3500 series generator sets
Delta Configuration Diagrams
6 Lead Generators
Illustration 8 g00626135
Single-Phase Voltage Diagram with Six-Lead Delta Configuration
12 Lead Generators
Illustration 9 g00626136
Single-Phase Voltage Diagram with Twelve-Lead Delta Configuration