TM 9-6115-669-13&P1.14.7InteractionofComponentswithintheSystem.Operating the EPP III with the loads or with the commercial power converter involves transferringa variety of control and acknowledgment signals through the signal lines. The subparagraphs abovealso provide detailed descriptions of the signals.SynchronizationSynchronization involves measuring the R (L1) and S (L2) phase voltages on the bus bars (figure1-13). Identical synchronization circuits are present for this purpose in the generators and in theEPP III PDU, which are active simultaneously. During operation with the commercial powerconverter, both bus bars 1 and 2 are linked through the power contactors and power cable. Powercontactors K1 and K40 are activated when synchronization is assured.Control System for Parallel Generator OperationThe control lines required for parallel generator operation are looped from the two J9 connectors ofthe generator connection panels through the PDU. The signals involved are those on J9 connectorpins F, G, H, J, P, R, S, T, U, X, Y, 2 (table 1-4). These signals are not used in the PDU.Control System between EPP III, Commercial Power Converter, and ECS LoadThese control signals and signal lines act between the generator and PDU control systems throughconnector J9 (table 1-4), and then through connector J5 and the control cable to the ECS (table 1-5).Operating with the Commercial Power ConvetrterFor this operating mode, two additional cables must be connected to the PDU. Phase voltages R (L1)and S (L2) are switched through the cable to J6 for synchronization purposes. The cable to J20 isused to switch power contactor K40.1 - 3 2
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