Figure 2-10. Parallel Operation (Load Sharing and Load Transfer) (Sheet 2 of 5)

Figure 2-10. Parallel Operation (Load Sharing and Load Transfer) (Sheet 1 of 5 )

Figure 2-10. Parallel Operation (Load Sharing and Load Transfer) (Sheet 3 of 5)

TM-5-6115-545-12 Power Unit Utility Pack Gas Turbine Engine Driven (Air Research Model PPU85-5) Non-Winterized and (Air Research Model PPU85-4) Winterized Manual
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A - PARALLEL OPERATION (LOAD SHARING) STEP 1. THE FIRST SET STARTED SHALL BE DESIGNATED AS “ON-LINE” AND THE SETS IN PAR- ALLEL OPERATION SHALL BE DESIGNATED “ON-COMING.” WITH ALL SETS SHUT DOWN INSTALL THE PARALLELING CABLE AND CONNECT THE LOAD TERMINAL BOARDS AS DESCRIBED IN FIGURE 2-3A. CHECK THAT THE VOLTAGE RECONNECTION BOARDS (FIGURE 2-4) OF THE SETS TICALLY POSITIONED. CAUTION DO NOT PLACE THE CIRCUIT BREAKER SWITCH ON ANY OF THE GEN- ERATOR SETS IN THE CLOSE POSITION UNTIL SPECIFICALLY DI- RECTED TO DO SO. CLOSING THE CIRCUIT BREAKER SWITCH AT ANY OTHER TIME MAY SEVERELY DAMAGE ONE OR MORE OF THE GEN- ERATOR SETS. CAUTION CHECK THAT THE MAIN POWER SWITCH (FIGURE 2-3.2) AT THE LOAD IS OPEN BEFORE ATTEMPTING TO PLACE A GENERATOR SET ON LINE. STEP 2. START THE GENERATOR SETS AS DESCRIBED IN FIGURES 2-6 AND 2-7. DO FORM STEP 8 OF FIGURE 2-7. ARE IDEN- NOT PER- STEP 3. HOLD THE CKT BRK SWITCH (FIGURE 2-5) OF THE “ON-LINE” SET IN THE CLOSE PO- SITION UNTIL THE CKT BRK INDICATOR LIGHT ILLUMINATES. PLACE THE OPERATION SWITCH IN THE PARALLEL POSITION. STEP 4. ADJUST THE VOLTAGE ON BOTH SETS TO THE REQUIRED VALUE. ADJUST THE FREQUEN- CY OF THE “ON-LINE” SET TO THE REQUIRED VALUE. PLACE THE OPERATION SWITCH OF THE “ON-COMING” SET IN THE PARALLEL POSITION. NOTE OBSERVE THE SYNCHRONIZING LIGHTS OF THE “ON-COMING” SET. THE LIGHTS SHOULD GO ON AND OFF SIMULTANEOUSLY. IF THE LIGHTS GO ON AND OFF ALTERNATELY, SETS ARE OUT OF PHASE. STOP BOTH SETS AND CORRECT INTERCONNECTION CABLES AS DE- SCRIBED IN (FIGuRE 2-3.1). IF THE PROBLEM PERSISTS, RE- FER TO NEXT HIGHER LEVEL OF MAINTENANCE. STEP 5. ADJUST THE FREQUENCY OF THE “ON-COMING” SET A LITTLE HIGHER THAN THE “ON- LINE” SET. THEN REDUCE THE FREQUENCY SLOWLY WITH THE FREQUENCY ADJUST RHEOSTAT UN- TIL THE SYNCHRONIZING LIGHTS REMAIN ON OR OFF AT 2 TO 3 SECOND INTERVALS. STEP 6. CAREFULLY OBSERVE THE SYNCHRONIZING LIGHTS OF THE “ON-COMING” SET AND, AT THE INSTANT BOTH LIGHTS GO DARK, PLACE THE CKT BRK SWITCH OF THE “ON-COMING” SET TO THE CLOSE POSITION. WHEN THE CKT BRK INDICATOR LIGHT ILLUMINATES, THE SETS ARE OP- ERATING IN PARALLEL. Figure 2-10. Parallel Operation (Load Sharing and Load Transfer) (Sheet 2 of 5) 2-26 Change 12

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