Figure 2-10. Parallel Operation (Load Sharing and Load Transfer) (Sheet 4 of 5)

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

Figure 2-10. Parallel Operation (Load Sharing and Load Transfer) (Sheet 5 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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NOTE VISUALLY CHECK THAT THE POWER CABLE AND PARALLEL CABLE ARE IN ACCORDANCE WITH FIGURE 2-3B. IF THE CABLES ARE NOT AT- TACHED AS INDICATED, SHUT DOWN THE “ON-LINE” SET AND FOL- LOW INSTRUCTIONS IN PARAGRAPH 2-14D. CAUTION DO NOT ATTEMPT LOAD CONNECTS IN PARAGRAPH 2-14D UNLESS ALL SETS ARE OFF AND NO OTHER EXTERNAL VOLTAGE IS APPLIED TO THE LOAD. STEP 1. THE SET IN OPERATION SHALL BE DESIGNATED AS “ON-LINE” AND THE SETS PLACED IN PARALLEL OPERATION SHALL BE DESIGNATED “ON-COMING.” STEP 20 PLACE THE OPERATIONS SWITCH (FIGURE 2-5) ON BOTH SETS IN THE PARALLEL OPER- ATION POSITION. CAUTION DO NOT CLOSE THE CIRCUIT BREAKER SWITCH AFTER STARTING THE “ON-COMING” SET AS SERIOUS DAMAGE TO ONE OR BOTH GENERATOR SETS MAY RESULT. STEP 3. REFER TO FIGURE 2-6 AND 2-7 (DO NOT PERFORM STEP 8 OF FIGURE 2-7), AND START THE “ON-COMING” SET. STEP 4. NOTE THE VOLTAGE INDICATED ON THE “ON-LINE" SET. ADJUST THE VOLTAGE OF THE “ON-COMING" SET TO THE VOLTAGE NOTED ON THE “ON-LINE” SET. STEP 5. ADJUST THE FREQUENCY OF THE “ON-COMING” SET TO A HIGHER VALUE THAN THAT OF THE “ON-LINE” SET. STEP 6. SLOWLY REDUCE THE FREQUENCY OF THE “ON-COMING” SET UNTIL THE SYNCHRONIZING LIGHTS (FIGURE 2-5) FLASH AT 2 TO 3 SECOND INTERVALS. CAUTION DO NOT PLACE THE CIRCUIT BREAKER SWITCH OF THE “ON-COMING” SET IN THE CLOSE POSITION WHILE THE SYNCHRONIZING LIGHTS ARE LIT AS DAMAGE TO ONE OR BOTH GENERATOR SETS MAY RESULT. STEP 7. CAREFULLY WATCH THE SYNCHRONIZING LIGHTS OF THE “ON-COMING” SET. AT THE INSTANT BOTH LIGHTS GO DARK, MOVE THE CIRCUIT BREAKER SWITCH OF THE “ON-COMING” SET TO THE CLOSE POSITION. STEP 8. LOAD AND STEP 9. STEP 10. ADJUST THE VOLTAGE AND FREQUENCY RHEOSTATS OF THE “ON-COMING” SET UNTIL CURRENT ARE DIVIDED EQUALLY BETWEEN THE TWO GENERATOR SETS. MOVE THE CIRCUIT BREAKER SWITCH OF THE “ON-LINE” SET TO THE OPEN POSITION. PLACE THE OPERATIONS SWITCH OF THE “ON-COMING” SET TO THE SINGLE UNIT OPER- ATION POSITION. Figure 2-10. Parallel Operation (Load Sharing and Load Transfer) 2-26.2 Change 12 (Sheet 4 of 5)

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