BRACKET AS 1949462 - Caterpillar

Winding Connections
The wiring connections that are used between the generator and the EMCP 4 depend upon the winding configurations of the generator. Refer to the following connection diagrams.
Illustration 1 g02286733
Three Phase Four Wire (Series or Parallel) Wye (Star)
Illustration 2 g02286773
Three Phase Four Wire Delta
Illustration 3 g02286775
Three Phase Three Wire Delta
Illustration 4 g02286776
Single Phase Three Wire (Double Delta)
Illustration 5 g02286854
Single Phase Two Wire (Double Delta)
Transformer Connections
In order to monitor the generator output voltages greater than 600V, potential transformers (PTs) must be used.Note: The EMCP 4 must be programmed when connecting external PTs. Reference: Systems Operation, "Setpoint Programming" and Testing and Adjusting, "Electronic Control Module (Generator Set) - Configure".Note: The wye configuration of external PTs is preferred for 4-wire wye generators because of the greater accuracy when loads are unbalanced. With the open delta configuration, some power parameters cannot be determined. These parameters are real power phase A, B, C, and power factor phase A, B, C. For maximum accuracy, the open delta configuration of external PTs should be used only for 3-wire delta generators.
Illustration 6 g02286873
Wye configuration of external potential transformers on the 4-wire Wye Generator
This configuration allows the accurate measurement of all power parameters by the EMCP 4 including when the loads are unbalanced and neutral current is present. All power parameters are shown on the display of the EMCP 4. The EMCP 4 configuration parameter " Generator Connection Configuration" should be set to WYE (or STAR).
Illustration 7 g02286876
Open Delta Configuration of external potential transformers on the 3-wire Delta Generator
This configuration allows the accurate measurement of power parameters by the EMCP 4 including when the loads are unbalanced and circulating current is present. The real power phase A, B, and C cannot be determined. The power factor phase A, B, and C cannot be determined. The phases are not shown on the EMCP 4 display. The EMCP 4 configuration parameter "Generator Connection Configuration" should be set to DELTA (3 WIRE).
Illustration 8 g02286877
Open Delta configuration of external potential transformers on the 4-wire Wye Generator
This configuration results in less accurate measurement of all power parameters by the EMCP 4 when the loads are unbalanced and neutral current is present. Real power phase A, B, C and power factor phase A, B, C cannot be determined and are not shown on the EMCP 4 display. The EMCP 4 configuration parameter "Generator Connection Configuration" should be set to DELTA (3 WIRE).
On 4-wire wye generators, three separate PTs are required for accurate power metering unless the loads are completely and continually balanced. Even if the loads are balanced, some power parameters cannot be determined. Real power phase A, B, C, and power factor phase A, B, C are not shown on the EMCP 4 display.On 3-wire delta generators, two PTs allow maximum accuracy for all load conditions. Real power phase A, B, C and power factor phase A, B, C cannot be determined and are not shown on the EMCP 4 display.
Table 1
Transformer Connections
Parameter Star 3-WIRE DELTA 4-WIRE DELTA 2-WIRE 1-PHASE 3-WIRE 1-PHASE
Gen Freq