PISTON AS 5433724 - Caterpillar

Illustration 1 g00584152
Wye Configuration Of External Potential Transformers (PT) On 4-Wire Wye GeneratorThis configuration enables accurate measurement of all the power parameters for the GSC+ including unbalanced loads and when neutral current is present. All power parameters are shown on the display of the GSC+.
Illustration 2 g00584153
Open Delta Configuration Of External Potential Transformers (PT) On The 3-Wire Delta GeneratorThis configuration allows the accurate measurement of power parameters by the GSC+ including when the loads are unbalanced and circulating current is present. The real power phase A, B and C can not be determined. The power factor phase A, B and C can not be determined. The phases are not shown on the GSC+ display.
Illustration 3 g00584154
Open Delta Configuration Of External Potential Transformers (PT) On The 4-Wire Wye GeneratorThis configuration results in less accurate measurement of all power parameters by the GSC+ when the loads are unbalanced and neutral current is present. Real power phase A, B, C and power factor phase A, B, C can not be determined and are not shown on the GSC+ display.Note: The wye configuration of external potential transformers (PT's) is preferred for 4-wire wye generators because of the greater accuracy when loads are unbalanced. With the open delta configuration, some power parameters can not 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 PT's should be used only for 3-wire delta generators.On 4-wire wye generators, three separate potential transformers (PT's) are required for accurate power metering unless the loads are completely and continually balanced. Even if the loads are balanced, some power parameters can not be determined. These parameters are not shown on the GSC+ display: real power phase A, B, C and power factor phase A, B, C. The ATB+ contains three potential transformers in order to accommodate 4-wire wye generators. The full capabilities of the ATB+ are not utilized when an open delta PT configuration is used for 4-wire wye generators.On 3-wire delta generators, two potential transformers allow maximum accuracy for all load conditions. However, again real power phase A, B, C and power factor phase A, B, C can not be determined and are not shown on the GSC+ display.The GSC+ must be programmed when connecting external PT's to the ATB+.Procedure For Programming When PT's Are Used
Program setpoint P032 in order to match the configuration of the external PT's. Setpoint P032 must always match the configuration of the external PT's regardless of whether the generator is a wye or delta. This is necessary because the ATB+ is connected only to the external PT's and cannot sense the generator connections.
For external PT's that are connected in a wye configuration, program setpoint P032 to 0 (wye). Setpoint P032 is also programmed to 0 when