Figure 2-10A. Parallel Operation of Tactical Utility Generator Sets (Load Sharing and Load Transfer) (Sheet 2 of 4)

Figure 2-10A. Parallel Operation of Tactical Utility Generator Sets (Load Sharing and Load Transfer) (Sheet 1 of 4)

Figure 2-l0.l. Parallel Operation of Tactical Utility Generator Sets (Load Sharing and Load Transfer) (Sheet 3 of 4)

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 OF TACTICAL UTILITY GENERATOR SETS (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 CONNECT THE LOAD TERMINAL BOARDS AS DESCRIBED IN FIGURE 2-3. CHECK THAT THE VOLTAGE RECON- NECTION BOARDS (FIGURE 2-4) OF THE SETS ARE IDENTICALLY POSITIONED. CAUTION DO NOT PLACE THE CIRCUIT BREAKER SWITCH ON ANY OF THE GENERATOR SETS IN THE CLOSE POSITION UNTIL SPECIFICAL- LY DIRECTED TO DO SO. CLOSING THE CIRCUIT BREAKER SWITCH AT ANY OTHER TIME MAY SEVERELY DAMAGE ONE OR MORE OF THE GENERATOR 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 NOT PER- FORM STEP 8 OF FIGURE 2-7. 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. SET “VOLT-AMPS TRANSFER SWITCH” IN THE LI-LO POSITION. ADJUST THE VOLTAGE ADJUST RHEOSTAT UNTIL THE AC VOLTMETER INDICATES 122 VOLTS FOR THE 120/208 CONNEC- TION AND 244 VOLTS FOR THE 240/416 CONNECTION. ADJUST MANUAL SPEED CONTROL UNTIL THE FREQUENCY METER INDICATES 61 HERTZ. PLACE THE OPERATION SWITCH OF THE “ON-COM- ING” 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 INTERCONNECT CABLES (FIGURE 2-3.1). IF PROBLEM PERSISTS, REFER TO NEXT HIGHER LEVEL OF MAINTENANCE. STEP 5. ADJUST THE MANUAL SPEED CONTROL OF THE “ON-COMING” SET UNTIL THE SYNCHRON- IZING LIGHTS, SIMULTANEOUSLY, 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 2-10A. Parallel Operation of Tactical Utility Generator Sets (Load Sharing and Load Transfer) (Sheet 2 of 4) Change 12 2-26.5

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