STEP 7.
WITH NO EXTERNAL LOAD ON THE PARALLELED SETS, ADJUST THE MANUAL SPEED CON-
TROL OF THE “ON-COMING” SET UNTIL BOTH PERCENT POWER METERS (KILOWATT) INDICATE
ZERO .
ADJUST THE VOLTAGE ADJUST RHEOSTAT OF THE “ON-COMING” SET UNTIL THE PERCENT
OF RATED CURRENT METERS (AMMETERS) ON BOTH SETS INDICATE ZERO.
TURNING COUNTER-
CLOCKWISE WILL DECREASE READINGS.
STEP 8.
APPLY LOAD TO THE SETS.
THE KILOWATT LOAD SHOULD DIVIDE SO THAT THE LOAD
ON EACH SET IS EQUAL.
IF THE LOAD AND CURRENT ARE NOT SHARED EQUALLY, ADJUST THE
LOAD BY OBSERVING THE SET WHICH HAS THE HIGHER READING ON THE KILOWATT METER. DE-
CREASE THE ENGINE SPEED OF THIS SET BY ADJUSTING COUNTERCLOCKWISE THE MANUAL SPEED
CONTROL IN SMALL INCREMENTS.
INCREASE THE ENGINE SPEED OF THE SET WITH THE LOWER
KILOWATT READING BY ADJUSTING CLOCKWISE THE MANUAL SPEED CONTROL IN SMALL INCREMENTS.
ADJUSTMENTS SHOULD BE MADE BETWEEN BOTH SETS UNTIL THE KILOWATT METERS ARE BALANCED.
STEP 9.
THE CURRENT SHOULD DIVIDE SO THAT THE OBSERVED DIFFERENCE BETWEEN THE CUR-
RENT ON ANY PHASE BETWEEN THE “ON-LINE” AND “ON-COMING” SETS IS NOT MORE THAN 20
PERCENT.
IF THE READINGS ARE NOT WITHIN 20 PERCENT, NOTIFY HIGHER LEVEL MAINTENANCE.
CAUTION
WHEN GENERATOR SETS ARE BEING OPERATED IN PARALLEL, ONE
OR MORE OPERATORS MUST REMAIN WITH THE SETS TO MONITOR THE
RATED LOAD AND CURRENT METERS.
MAKE FURTHER ADJUSTMENTS
AS REQUIRED TO MAINTAIN EQUAL LOAD ON THE PARALLELED SETS.
CAUTION
PRIOR TO REMOVAL OF GENERATOR SET FROM PARALLEL OPERATION,
MAKE SURE THE LOAD DOES NOT EXCEED THE FULL LOAD RATING OF
SETS(S) REMAINING ON LINE.
STEP 10. TO REMOVE A GENERATOR SET FROM PARALLEL OPERATION, PLACE THE CIRCUIT BREAK-
ER SWITCH OF THAT SET IN THE OPEN POSITION.
STOP THE SET AS DESCRIBED IN FIGURE 2-8.
B - PARALLEL OPERATION (LOAD TRANSFER)
THE FOLLOWING METHOD OF PARALLEL OPERATION IS TO BE USED WHEN IT IS NECESSARY TO
TRANSFER THE LOAD FROM ONE SET TO THE OTHER WITHOUT INTERRUPTING POWER.
NOTE
VISUALLY CHECK THAT THE POWER CABLE AND PARALLEL CABLE ARE
IN ACCORDANCE WITH FIGURE 2-3.2. IF THE CABLES ARE NOT AT-
TACHED AS INDICATED, SHUT DOWN THE “ON-LINE” SET AND FOLLOW
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.
Figure 2-l0.l. Parallel Operation of Tactical Utility Generator Sets
(Load Sharing and Load Transfer) (Sheet 3 of 4)
2-26.6
Change 12
