TM 5-6115-593-12
TO 35C2-3-463-1
A. DROOP PARALLELING
STEP 1. ENSURE THAT A SHORTING PLUG IS INSTALLED IN ONE REACTIVE LOAD COMPENSATION
CONNECTOR OR ON EACH SET AND THAT ALL FREQUENCY DROOP-ISOCHRONOUS SWITCHES
ARE IN DROOP POSITION. DESIGNATE ONE SET AS MASTER AND SECOND SET AS ONCOMING.
WARNING
USE EXTREME CAUTION. LOAD TERMINALS OF GENERATOR SET CIRCUIT BREAKER (CB2)
MAY STILL BE ENERGIZED WITH THE BUS VOLTAGE. SERIOUS INJURY OR DEATH COULD
RESULT.
STEP 2. INERCONNECT POWER OUTPUT TERMINALS (LO-LO, L1-L1, L2-L2, L3-L3) OF THE TWO SETS. [THESE
INTERCONNECTS SHOULD BE MADE VIA 3-PHASE DISCONNECT SWITCH (STATION SWITCH GEAR)
ON THE LOAD SIDE OF EACH GENERATOR SET CIRCUIT BREAKER (CB2)].
WARNING
DEATH OR SERIOUS INJURY NAY RESULT IF PERSONNEL FAIL TO OBSERVE SAFETY
PRECAUTIONS. DO NOT ATTEMPT TO MAKE ANY CONNECTIONS UNTIL GENERATOR SET IS
COMPLETELY SHOT DOWN AND MAINTENANCE LOCKOUT SWITCH IS IN LOCKOUT POSITION.
STEP 3.
PREPARE AND START MASTER SET PER INSTRUCTIONS GIVEN IN FIGURES 2-5 AND 2-8.
STEP 4.
ONCE AC PWR CKT BKR IS CLOSED, PLACE THE PARALLEL OPERATION-SINGLE UNIT OPERATION
SWITCH IN THE PARALLEL POSITION.
STEP 5.
START ONCOMING SET PER FIGURES 2-5 AND 2-8.
STEP 6.
CHECK PHASE SEQUENCE OF ONCOMING SET USING PHASE SEQUENCE 1-2-3 AND 1-3-2 LAMPS.
ENSURE THAT SETS ARE IN SEQUENCE BEFORE PROCEEDING.
STEP 7.
PLACE PARALLEL OPERATION-SINGLE UNIT OPERATION SWITCH ON ONCOMING SET TO
PARALLEL OPERATION POSITION.
STEP 8.
SYNC LIGHTS AND SYNCHROSCOPE ON ONCOMING SET SHOULD NOW INDICATE THE
DIFFERENCES IN VOLTAGE AND FREQUENCY BETWEEN THE TWO SETS.
STEP 9.
ADJUST THE FREQUENCY OF ONCOMING SET UNTIL THE SYNC LIGHTS ARE BLINKING VERY
SLOWLY AND/OR SYNCHROSCOPE INDICATES THAT THE SETS ARE IN PHASE. THE ONCOMING
SET FREQUENCY SHOULD BE SLIGHTLY HIGHER AS INDICATED BY THE SYNCHROSCOPE.
STEP 10.
ADJUST THE VOLTAGE OF THE ONCOMING; SET USING VOLTMETER SELECTOR SWITCH AND
VOLTMETER UNTIL THE VOLTAGES ARE IDENTICAL.
STEP 11.
CLOSE THE AC PWR CKT BKR ON THE ONCOMING SET THE SYNCH LIGHTS ARE DARK AND THE
SYNCHROSCOPE NEEDLE IS IN THE 12 O'CLOCK POSITION.
STEP 12.
TRIM THE VOLTAGE AND FREQUENCY TO BALANCE THE LOAD ON BOTH SETS AS INDICATED BY
THE KVAR AND KW METERS. IF LOAD SHIFTS BETWEEN UNITS TRIM REACTIVE LOAD
COMPENSATION CONTROL AND LOAD GAIN SETTING ON GOVERNOR CONTROLLER.
STEP 13.
IF INCOMING SET IS ALREADY HOOKED UP, REPEAT STEPS 5 THRU 12.
B. ISOCHRONOUS PARALLELING.
STEP 1. REMOVE SHORTING PLUGS FROM ALL SETS AND INTERCONNECT REACTIVE LOAD COMPENSATION
AND GOVERNOR PARALLELING CIRCUIT CABLES.
STEP 2. ENSURE THAT FREQUENCY DROOP-ISOCHRONOUS SWITCH IS IN THE ISOCHRONOUS POSITION.
STEP 3.
PROCEED AS IN A., ABOVE, STEPS 2 THROUGH 12.
Figure 2-21. Operating Instructions, Manually Operated
in Parallel (Sheet 2 of 3)
2-44
