COVER AS 3785922 - Caterpillar

Three-Phase Voltage Connections
The Wye configuration for a 480 volt generator and the Delta configuration for a 240 volt generator are given in the following diagrams.The terminals must be connected securely. The terminals must also be insulated with a good quality electrical tape.If a Delta Configuration is used, a two-thirds winding pitch is required with 590 frame size generators and above. If the winding pitch of the generator is not two-thirds, third harmonics will cause a high circulating current. The generator will need to be derated. This current can exceed the current rating for the winding, causing the generator to overheat and damage which may pose a fire hazard. A Wye connected generator may require a two-thirds pitch winding if the neutral is solidly grounded. Refer to the Specifications, LEBX6693, "Generator Set Installation Drawings" for more information. A floating neutral does not require a two-thirds pitch winding.Wye Configuration Diagrams
6 Lead Generators
Illustration 1 g00626053
Typical Wye Configuration (60 Hz, 6 Lead)
12 Lead Generators
Illustration 2 g00637319
Typical Series Wye Configuration (60 Hz, 12 Lead)
This is a typical high voltage connection.
Illustration 3 g00637320
Typical Parallel Wye (Star) Configuration (60 Hz, 12 Lead)
This is a typical low voltage connection.
Delta Configuration Diagrams
6 Lead Generators
Illustration 4 g00626129
Typical Delta Configuration (60 Hz, 6 Lead)
12 Lead Generators
Illustration 5 g00626130
Typical Delta Configuration (60 Hz, 12 Lead)